diff --git a/Dockerfile b/Dockerfile
index f251cfa..f352402 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -9,9 +9,15 @@ COPY frontend/ ./
 RUN npm run build
 
 # ---- Stage 2: build the Go binary (cgo + libvips) ----
-FROM golang:1.26-bookworm AS builder
+# Trixie (not bookworm) for its newer libheif: bookworm's libheif 1.15 rejects
+# iPhone HEICs during decode ("Metadata not correctly assigned to image");
+# trixie's 1.19 decodes them fine. Builder and runtime bases must match.
+FROM golang:1.26-trixie AS builder
+# libheif-dev provides the HEIF/HEIC loader headers libvips' heifload links
+# against — libvips-dev only recommends it, so install it explicitly or HEIC
+# decoding is silently absent from the build.
 RUN apt-get update && apt-get install -y --no-install-recommends \
-        libvips-dev pkg-config curl ca-certificates \
+        libvips-dev libheif-dev pkg-config curl ca-certificates \
     && rm -rf /var/lib/apt/lists/*
 
 # VERSION is the release string shown in the UI footer (via /version). It is
@@ -35,10 +41,20 @@ RUN CGO_ENABLED=1 GOOS=linux go build -tags "vips" \
         -o /app/image-optimizer .
 
 # ---- Stage 3: minimal runtime ----
-FROM debian:bookworm-slim AS runtime
-# libvips42 is required by the image pipeline.
+FROM debian:trixie-slim AS runtime
+# libvips42t64 is required by the image pipeline (the package was renamed from
+# libvips42 in trixie's time_t-64 transition). On trixie libheif's codecs are
+# split into plugins, and the encoders are only Recommends — so with
+# --no-install-recommends they must be named explicitly or libvips loads but
+# fails on write:
+#   libde265-0              HEVC *decoder* — read HEIC (or decode fails:
+#                           "Unsupported codec")
+#   libheif-plugin-aomenc   AV1 *encoder*  — write AVIF (convert_avif,
+#                           website_avif, srcset AVIF members; else "heifsave:
+#                           Unsupported compression")
+# Without libheif at all, HEIC uploads decode to nothing → empty ZIP.
 RUN apt-get update && apt-get install -y --no-install-recommends \
-        libvips42 ca-certificates \
+        libvips42t64 libheif1 libde265-0 libheif-plugin-aomenc ca-certificates \
     && rm -rf /var/lib/apt/lists/* \
     && useradd --create-home --uid 10001 app
 COPY --from=builder /app/image-optimizer /usr/local/bin/image-optimizer
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 388ebc0..c7ac7f5 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -8,453 +8,45 @@
       "name": "image-optimizer-frontend",
       "version": "0.1.0",
       "devDependencies": {
-        "@sveltejs/vite-plugin-svelte": "^5.0.0",
+        "@sveltejs/vite-plugin-svelte": "^7.1.2",
         "@tailwindcss/vite": "^4.3.0",
         "svelte": "^5.0.0",
         "tailwindcss": "^4.3.0",
-        "vite": "^6.0.0"
+        "vite": "^8.0.16"
       }
     },
-    "node_modules/@esbuild/aix-ppc64": {
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-      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.25.12.tgz",
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-      "cpu": [
-        "ppc64"
-      ],
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "aix"
-      ],
-      "engines": {
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-      "cpu": [
-        "x64"
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+    "node_modules/@emnapi/wasi-threads": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/@emnapi/wasi-threads/-/wasi-threads-1.2.1.tgz",
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     "node_modules/@jridgewell/gen-mapping": {
@@ -507,24 +99,39 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
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       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@tailwindcss/node": "4.3.0",
-        "@tailwindcss/oxide": "4.3.0",
-        "tailwindcss": "4.3.0"
+        "@tailwindcss/node": "4.3.1",
+        "@tailwindcss/oxide": "4.3.1",
+        "tailwindcss": "4.3.1"
       },
       "peerDependencies": {
         "vite": "^5.2.0 || ^6 || ^7 || ^8"
       }
     },
+    "node_modules/@tybys/wasm-util": {
+      "version": "0.10.2",
+      "resolved": "https://registry.npmjs.org/@tybys/wasm-util/-/wasm-util-0.10.2.tgz",
+      "integrity": "sha512-RoBvJ2X0wuKlWFIjrwffGw1IqZHKQqzIchKaadZZfnNpsAYp2mM0h36JtPCjNDAHGgYez/15uMBpfGwchhiMgg==",
+      "dev": true,
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "tslib": "^2.4.0"
+      }
+    },
     "node_modules/@types/estree": {
       "version": "1.0.9",
       "resolved": "https://registry.npmjs.org/@types/estree/-/estree-1.0.9.tgz",
@@ -1194,9 +720,9 @@
       "license": "MIT"
     },
     "node_modules/acorn": {
-      "version": "8.16.0",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.16.0.tgz",
-      "integrity": "sha512-UVJyE9MttOsBQIDKw1skb9nAwQuR5wuGD3+82K6JgJlm/Y+KI92oNsMNGZCYdDsVtRHSak0pcV5Dno5+4jh9sw==",
+      "version": "8.17.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.17.0.tgz",
+      "integrity": "sha512-xRQbDb9BnwDafYNn6Vwl839DYVjqXYb1XVGtWAZ1kcDc6iwAL4hg3B1dZlRiuENFeO2H53gFG3in621AdERVAg==",
       "dev": true,
       "license": "MIT",
       "bin": {
@@ -1236,24 +762,6 @@
         "node": ">=6"
       }
     },
-    "node_modules/debug": {
-      "version": "4.4.3",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
-      "integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
-      "dev": true,
-      "license": "MIT",
-      "dependencies": {
-        "ms": "^2.1.3"
-      },
-      "engines": {
-        "node": ">=6.0"
-      },
-      "peerDependenciesMeta": {
-        "supports-color": {
-          "optional": true
-        }
-      }
-    },
     "node_modules/deepmerge": {
       "version": "4.3.1",
       "resolved": "https://registry.npmjs.org/deepmerge/-/deepmerge-4.3.1.tgz",
@@ -1282,9 +790,9 @@
       "license": "MIT"
     },
     "node_modules/enhanced-resolve": {
-      "version": "5.22.2",
-      "resolved": "https://registry.npmjs.org/enhanced-resolve/-/enhanced-resolve-5.22.2.tgz",
-      "integrity": "sha512-0rxICaFZ7NQho/sHely2bvOPRP0Eu2B0NZ9zM54YvRvWMn7jfz3DmnOZDR9LlXDdDcqntAVc6Hfy4gr/tdH/Ag==",
+      "version": "5.21.6",
+      "resolved": "https://registry.npmjs.org/enhanced-resolve/-/enhanced-resolve-5.21.6.tgz",
+      "integrity": "sha512-aNnGCvbJ/RIyWo1IuhNdVjnNF+EjH9wpzpNHt+ci/m9He9LJvUN8wrCcXjp9cWsGNAuvSpVFTx/vraAFQ8qGjQ==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -1295,48 +803,6 @@
         "node": ">=10.13.0"
       }
     },
-    "node_modules/esbuild": {
-      "version": "0.25.12",
-      "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.25.12.tgz",
-      "integrity": "sha512-bbPBYYrtZbkt6Os6FiTLCTFxvq4tt3JKall1vRwshA3fdVztsLAatFaZobhkBC8/BrPetoa0oksYoKXoG4ryJg==",
-      "dev": true,
-      "hasInstallScript": true,
-      "license": "MIT",
-      "bin": {
-        "esbuild": "bin/esbuild"
-      },
-      "engines": {
-        "node": ">=18"
-      },
-      "optionalDependencies": {
-        "@esbuild/aix-ppc64": "0.25.12",
-        "@esbuild/android-arm": "0.25.12",
-        "@esbuild/android-arm64": "0.25.12",
-        "@esbuild/android-x64": "0.25.12",
-        "@esbuild/darwin-arm64": "0.25.12",
-        "@esbuild/darwin-x64": "0.25.12",
-        "@esbuild/freebsd-arm64": "0.25.12",
-        "@esbuild/freebsd-x64": "0.25.12",
-        "@esbuild/linux-arm": "0.25.12",
-        "@esbuild/linux-arm64": "0.25.12",
-        "@esbuild/linux-ia32": "0.25.12",
-        "@esbuild/linux-loong64": "0.25.12",
-        "@esbuild/linux-mips64el": "0.25.12",
-        "@esbuild/linux-ppc64": "0.25.12",
-        "@esbuild/linux-riscv64": "0.25.12",
-        "@esbuild/linux-s390x": "0.25.12",
-        "@esbuild/linux-x64": "0.25.12",
-        "@esbuild/netbsd-arm64": "0.25.12",
-        "@esbuild/netbsd-x64": "0.25.12",
-        "@esbuild/openbsd-arm64": "0.25.12",
-        "@esbuild/openbsd-x64": "0.25.12",
-        "@esbuild/openharmony-arm64": "0.25.12",
-        "@esbuild/sunos-x64": "0.25.12",
-        "@esbuild/win32-arm64": "0.25.12",
-        "@esbuild/win32-ia32": "0.25.12",
-        "@esbuild/win32-x64": "0.25.12"
-      }
-    },
     "node_modules/esm-env": {
       "version": "1.2.2",
       "resolved": "https://registry.npmjs.org/esm-env/-/esm-env-1.2.2.tgz",
@@ -1422,16 +888,6 @@
         "jiti": "lib/jiti-cli.mjs"
       }
     },
-    "node_modules/kleur": {
-      "version": "4.1.5",
-      "resolved": "https://registry.npmjs.org/kleur/-/kleur-4.1.5.tgz",
-      "integrity": "sha512-o+NO+8WrRiQEE4/7nwRJhN1HWpVmJm511pBHUxPLtp0BUISzlBplORYSmTclCnJvQq2tKu/sgl3xVpkc7ZWuQQ==",
-      "dev": true,
-      "license": "MIT",
-      "engines": {
-        "node": ">=6"
-      }
-    },
     "node_modules/lightningcss": {
       "version": "1.32.0",
       "resolved": "https://registry.npmjs.org/lightningcss/-/lightningcss-1.32.0.tgz",
@@ -1710,13 +1166,6 @@
         "@jridgewell/sourcemap-codec": "^1.5.5"
       }
     },
-    "node_modules/ms": {
-      "version": "2.1.3",
-      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
-      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
-      "dev": true,
-      "license": "MIT"
-    },
     "node_modules/nanoid": {
       "version": "3.3.12",
       "resolved": "https://registry.npmjs.org/nanoid/-/nanoid-3.3.12.tgz",
@@ -1736,6 +1185,20 @@
         "node": "^10 || ^12 || ^13.7 || ^14 || >=15.0.1"
       }
     },
+    "node_modules/obug": {
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/obug/-/obug-2.1.3.tgz",
+      "integrity": "sha512-9miFgM2OFba7hB+pRgvtV84pYTBaoTHohvmIgiRt6dRIzbwEOIaNaP+dIlGs2fNFoB0SeISs0Jz5WFVRid6Xyg==",
+      "dev": true,
+      "funding": [
+        "https://github.com/sponsors/sxzz",
+        "https://opencollective.com/debug"
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=12.20.0"
+      }
+    },
     "node_modules/picocolors": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/picocolors/-/picocolors-1.1.1.tgz",
@@ -1785,49 +1248,38 @@
         "node": "^10 || ^12 || >=14"
       }
     },
-    "node_modules/rollup": {
-      "version": "4.61.1",
-      "resolved": "https://registry.npmjs.org/rollup/-/rollup-4.61.1.tgz",
-      "integrity": "sha512-I4KW6iuRpuu2uHBLraZ1wNZe0DP7lnRha+VJ9tNaYVaVgKhW0aI3h4RYnoRPeql0flHm/Co55b7snEDcOfOJrA==",
+    "node_modules/rolldown": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/rolldown/-/rolldown-1.0.3.tgz",
+      "integrity": "sha512-i00lAJ2ks1BYr7rjNjKC7BcqAS7nVfiT3QX1SI5aY+AFHblCmaUf9OE9dbdzDvW6dJxbi2ZCZiy9v3CcwOiX3g==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "@types/estree": "1.0.9"
+        "@oxc-project/types": "=0.133.0",
+        "@rolldown/pluginutils": "^1.0.0"
       },
       "bin": {
-        "rollup": "dist/bin/rollup"
+        "rolldown": "bin/cli.mjs"
       },
       "engines": {
-        "node": ">=18.0.0",
-        "npm": ">=8.0.0"
+        "node": "^20.19.0 || >=22.12.0"
       },
       "optionalDependencies": {
-        "@rollup/rollup-android-arm-eabi": "4.61.1",
-        "@rollup/rollup-android-arm64": "4.61.1",
-        "@rollup/rollup-darwin-arm64": "4.61.1",
-        "@rollup/rollup-darwin-x64": "4.61.1",
-        "@rollup/rollup-freebsd-arm64": "4.61.1",
-        "@rollup/rollup-freebsd-x64": "4.61.1",
-        "@rollup/rollup-linux-arm-gnueabihf": "4.61.1",
-        "@rollup/rollup-linux-arm-musleabihf": "4.61.1",
-        "@rollup/rollup-linux-arm64-gnu": "4.61.1",
-        "@rollup/rollup-linux-arm64-musl": "4.61.1",
-        "@rollup/rollup-linux-loong64-gnu": "4.61.1",
-        "@rollup/rollup-linux-loong64-musl": "4.61.1",
-        "@rollup/rollup-linux-ppc64-gnu": "4.61.1",
-        "@rollup/rollup-linux-ppc64-musl": "4.61.1",
-        "@rollup/rollup-linux-riscv64-gnu": "4.61.1",
-        "@rollup/rollup-linux-riscv64-musl": "4.61.1",
-        "@rollup/rollup-linux-s390x-gnu": "4.61.1",
-        "@rollup/rollup-linux-x64-gnu": "4.61.1",
-        "@rollup/rollup-linux-x64-musl": "4.61.1",
-        "@rollup/rollup-openbsd-x64": "4.61.1",
-        "@rollup/rollup-openharmony-arm64": "4.61.1",
-        "@rollup/rollup-win32-arm64-msvc": "4.61.1",
-        "@rollup/rollup-win32-ia32-msvc": "4.61.1",
-        "@rollup/rollup-win32-x64-gnu": "4.61.1",
-        "@rollup/rollup-win32-x64-msvc": "4.61.1",
-        "fsevents": "~2.3.2"
+        "@rolldown/binding-android-arm64": "1.0.3",
+        "@rolldown/binding-darwin-arm64": "1.0.3",
+        "@rolldown/binding-darwin-x64": "1.0.3",
+        "@rolldown/binding-freebsd-x64": "1.0.3",
+        "@rolldown/binding-linux-arm-gnueabihf": "1.0.3",
+        "@rolldown/binding-linux-arm64-gnu": "1.0.3",
+        "@rolldown/binding-linux-arm64-musl": "1.0.3",
+        "@rolldown/binding-linux-ppc64-gnu": "1.0.3",
+        "@rolldown/binding-linux-s390x-gnu": "1.0.3",
+        "@rolldown/binding-linux-x64-gnu": "1.0.3",
+        "@rolldown/binding-linux-x64-musl": "1.0.3",
+        "@rolldown/binding-openharmony-arm64": "1.0.3",
+        "@rolldown/binding-wasm32-wasi": "1.0.3",
+        "@rolldown/binding-win32-arm64-msvc": "1.0.3",
+        "@rolldown/binding-win32-x64-msvc": "1.0.3"
       }
     },
     "node_modules/source-map-js": {
@@ -1841,9 +1293,9 @@
       }
     },
     "node_modules/svelte": {
-      "version": "5.56.2",
-      "resolved": "https://registry.npmjs.org/svelte/-/svelte-5.56.2.tgz",
-      "integrity": "sha512-1lDf8TLqpxyAt3xgybfytWPJQbaUD6TiDgpiCLH0BKrKEwzecB9pjuNVnEJMpzH018xUzo6oxheK2HT0oa2RoQ==",
+      "version": "5.56.3",
+      "resolved": "https://registry.npmjs.org/svelte/-/svelte-5.56.3.tgz",
+      "integrity": "sha512-w7JvrM5IFl5cmfbY0TLik9o7mjRUJmRMhOR51tBPu708Gr/MjbGs7VnJnr/B0CaXeI4vtnOh7RKxDr0cwhMdDA==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -1869,9 +1321,9 @@
       }
     },
     "node_modules/tailwindcss": {
-      "version": "4.3.0",
-      "resolved": "https://registry.npmjs.org/tailwindcss/-/tailwindcss-4.3.0.tgz",
-      "integrity": "sha512-y6nxMGB1nMW9R6k96e5gdIFzcfL/gTJRNaqGes1YvkLnPVXzWgbqFF2yLC0T8G774n24cx3Pe8XrKoniCOAH+Q==",
+      "version": "4.3.1",
+      "resolved": "https://registry.npmjs.org/tailwindcss/-/tailwindcss-4.3.1.tgz",
+      "integrity": "sha512-hk+TB1m+K8CYNrP6rjQaq/Y+4Zylwpa87mLYBKCunwnnQ9p+fHb7kmSfGqyEJoxF/O6CDyABWVFEafNSYKll+Q==",
       "dev": true,
       "license": "MIT"
     },
@@ -1906,25 +1358,32 @@
         "url": "https://github.com/sponsors/SuperchupuDev"
       }
     },
+    "node_modules/tslib": {
+      "version": "2.8.1",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
+      "integrity": "sha512-oJFu94HQb+KVduSUQL7wnpmqnfmLsOA/nAh6b6EH0wCEoK0/mPeXU6c3wKDV83MkOuHPRHtSXKKU99IBazS/2w==",
+      "dev": true,
+      "license": "0BSD",
+      "optional": true
+    },
     "node_modules/vite": {
-      "version": "6.4.3",
-      "resolved": "https://registry.npmjs.org/vite/-/vite-6.4.3.tgz",
-      "integrity": "sha512-NTKlcQjlAK7MlQoyb6LgaqHc8sso/pVyUJYWMws3jg21uTJw/LddqIFPcPqP6PzpgbIcZyKI85sFE4HBrQDA8A==",
+      "version": "8.0.16",
+      "resolved": "https://registry.npmjs.org/vite/-/vite-8.0.16.tgz",
+      "integrity": "sha512-h9bXPmJichP5fLmVQo3PyaGSDE2n3aPuomeAlVRm0JLmt4rY6zmPKd59HYI4LNW8oTK7tlTsuC7l/m7awx9Jcw==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
-        "esbuild": "^0.25.0",
-        "fdir": "^6.4.4",
-        "picomatch": "^4.0.2",
-        "postcss": "^8.5.3",
-        "rollup": "^4.34.9",
-        "tinyglobby": "^0.2.13"
+        "lightningcss": "^1.32.0",
+        "picomatch": "^4.0.4",
+        "postcss": "^8.5.15",
+        "rolldown": "1.0.3",
+        "tinyglobby": "^0.2.17"
       },
       "bin": {
         "vite": "bin/vite.js"
       },
       "engines": {
-        "node": "^18.0.0 || ^20.0.0 || >=22.0.0"
+        "node": "^20.19.0 || >=22.12.0"
       },
       "funding": {
         "url": "https://github.com/vitejs/vite?sponsor=1"
@@ -1933,14 +1392,15 @@
         "fsevents": "~2.3.3"
       },
       "peerDependencies": {
-        "@types/node": "^18.0.0 || ^20.0.0 || >=22.0.0",
+        "@types/node": "^20.19.0 || >=22.12.0",
+        "@vitejs/devtools": "^0.1.18",
+        "esbuild": "^0.27.0 || ^0.28.0",
         "jiti": ">=1.21.0",
-        "less": "*",
-        "lightningcss": "^1.21.0",
-        "sass": "*",
-        "sass-embedded": "*",
-        "stylus": "*",
-        "sugarss": "*",
+        "less": "^4.0.0",
+        "sass": "^1.70.0",
+        "sass-embedded": "^1.70.0",
+        "stylus": ">=0.54.8",
+        "sugarss": "^5.0.0",
         "terser": "^5.16.0",
         "tsx": "^4.8.1",
         "yaml": "^2.4.2"
@@ -1949,13 +1409,16 @@
         "@types/node": {
           "optional": true
         },
-        "jiti": {
+        "@vitejs/devtools": {
           "optional": true
         },
-        "less": {
+        "esbuild": {
           "optional": true
         },
-        "lightningcss": {
+        "jiti": {
+          "optional": true
+        },
+        "less": {
           "optional": true
         },
         "sass": {
diff --git a/frontend/package.json b/frontend/package.json
index 74eb595..f96c759 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -9,10 +9,10 @@
     "preview": "vite preview"
   },
   "devDependencies": {
-    "@sveltejs/vite-plugin-svelte": "^5.0.0",
+    "@sveltejs/vite-plugin-svelte": "^7.1.2",
     "@tailwindcss/vite": "^4.3.0",
     "svelte": "^5.0.0",
     "tailwindcss": "^4.3.0",
-    "vite": "^6.0.0"
+    "vite": "^8.0.16"
   }
 }
diff --git a/frontend/src/components/Dropzone.svelte b/frontend/src/components/Dropzone.svelte
index d725c98..e1b2982 100644
--- a/frontend/src/components/Dropzone.svelte
+++ b/frontend/src/components/Dropzone.svelte
@@ -50,6 +50,15 @@
     return byExt || byMime;
   }
 
+  // HEIC/HEIF can't be rendered by an <img> in any current browser, so a blob
+  // URL would just show a broken image. Detect those and show a placeholder
+  // instead — the file still uploads and converts server-side. Other accepted
+  // formats (incl. SVG) preview fine.
+  function previewable(file) {
+    const name = file.name.toLowerCase();
+    return !name.endsWith('.heic') && !name.endsWith('.heif');
+  }
+
   function fileKey(file) {
     return `${file.name}:${file.size}`;
   }
@@ -57,13 +66,15 @@
   function addFiles(fileList) {
     const incoming = Array.from(fileList).filter(isAccepted);
     if (incoming.length === 0) return;
-    const seen = new Set(files.map(fileKey));
+    const seen = new Set(files.map((entry) => entry.key));
     const additions = [];
     for (const f of incoming) {
       const key = fileKey(f);
       if (seen.has(key)) continue;
       seen.add(key);
-      additions.push({ file: f, url: URL.createObjectURL(f) });
+      // url is null for non-previewable formats (HEIC/HEIF); the template
+      // renders a placeholder in that case. key is stable for {#each} keying.
+      additions.push({ file: f, key, url: previewable(f) ? URL.createObjectURL(f) : null });
     }
     if (additions.length > 0) {
       files = [...files, ...additions];
@@ -80,14 +91,15 @@
 
   function removeAt(i) {
     const entry = files[i];
-    if (entry) URL.revokeObjectURL(entry.url);
+    if (entry?.url) URL.revokeObjectURL(entry.url);
     files = files.filter((_, idx) => idx !== i);
   }
 
   // Revoke any outstanding object URLs when the component is torn down.
+  // (HEIC/HEIF entries have a null url and nothing to revoke.)
   $effect(() => {
     return () => {
-      for (const entry of files) URL.revokeObjectURL(entry.url);
+      for (const entry of files) if (entry.url) URL.revokeObjectURL(entry.url);
     };
   });
 
@@ -188,22 +200,34 @@
 
   {#if files.length > 0}
     <ul class="grid grid-cols-2 gap-3 sm:grid-cols-3">
-      {#each files as entry, i (entry.url)}
+      {#each files as entry, i (entry.key)}
         <li
           class="animate-fade-up relative flex items-center gap-3 rounded-lg border border-ctp-surface1 bg-ctp-surface0 p-2 transition-all duration-200 hover:-translate-y-0.5 hover:border-ctp-mauve/50 hover:shadow-md hover:shadow-ctp-mauve/10"
           style="animation-delay: {Math.min(i, 12) * 40}ms"
         >
-          <img
-            src={entry.url}
-            alt={entry.file.name}
-            class="h-12 w-12 flex-none rounded object-cover ring-1 ring-ctp-surface1"
-          />
+          {#if entry.url}
+            <img
+              src={entry.url}
+              alt={entry.file.name}
+              class="h-12 w-12 flex-none rounded object-cover ring-1 ring-ctp-surface1"
+            />
+          {:else}
+            <!-- HEIC/HEIF can't be rendered in-browser; show a placeholder. -->
+            <div
+              class="flex h-12 w-12 flex-none items-center justify-center rounded bg-ctp-surface1 text-ctp-overlay0 ring-1 ring-ctp-surface1"
+              title="Preview not available for this format"
+            >
+              <svg class="h-6 w-6" fill="none" viewBox="0 0 24 24" stroke="currentColor" stroke-width="1.5" aria-hidden="true">
+                <path stroke-linecap="round" stroke-linejoin="round" d="M2.25 15.75l5.159-5.159a2.25 2.25 0 0 1 3.182 0l5.159 5.159m-1.5-1.5 1.409-1.409a2.25 2.25 0 0 1 3.182 0l2.909 2.909m-18 3.75h16.5a1.5 1.5 0 0 0 1.5-1.5V6a1.5 1.5 0 0 0-1.5-1.5H3.75A1.5 1.5 0 0 0 2.25 6v12a1.5 1.5 0 0 0 1.5 1.5Zm10.5-11.25h.008v.008h-.008V8.25Zm.375 0a.375.375 0 1 1-.75 0 .375.375 0 0 1 .75 0Z" />
+              </svg>
+            </div>
+          {/if}
           <div class="min-w-0 flex-1">
             <p class="truncate text-base text-ctp-text" title={entry.file.name}>
               {entry.file.name}
             </p>
             <p class="text-sm text-ctp-subtext1">{formatSize(entry.file.size)}</p>
-            {#if anyCrops}
+            {#if anyCrops && entry.url}
               <button
                 type="button"
                 class="mt-1 inline-flex items-center gap-1 text-xs font-medium transition-colors {entry.focal
diff --git a/frontend/src/lib/presets.js b/frontend/src/lib/presets.js
index e0281b4..0824cf9 100644
--- a/frontend/src/lib/presets.js
+++ b/frontend/src/lib/presets.js
@@ -37,10 +37,10 @@ export const PRESET_GROUPS = [
     category: 'Website',
     accent: 'blue',
     presets: [
-      { name: 'website_webp', label: 'WebP', dims: 'Original size', help: 'Best all-round web format: small files, excellent quality, supported by all modern browsers. If unsure, pick this.' },
-      { name: 'website_avif', label: 'AVIF', dims: 'Original size', help: 'Smallest files for the web, newest format. Slightly slower to encode and not supported by a few older browsers. Great paired with a JPEG fallback.' },
-      { name: 'jpeg_original', label: 'JPEG', dims: 'Original size', help: 'The universal fallback. Works everywhere, ideal for photographs. No transparency support.' },
-      { name: 'png_original', label: 'PNG', dims: 'Original size', help: 'Lossless with transparency. Best for logos, icons, and graphics with sharp edges or text. Larger than WebP.' },
+      { name: 'website_webp', label: 'WebP', dims: 'Max 2560px · web-ready', help: 'Best all-round web format: small files, excellent quality, supported by all modern browsers. If unsure, pick this. Large photos are scaled down to 2560px on the long edge for fast page loads (smaller images are left as-is).' },
+      { name: 'website_avif', label: 'AVIF', dims: 'Max 2560px · web-ready', help: 'Smallest files for the web, newest format. Slightly slower to encode and not supported by a few older browsers. Great paired with a JPEG fallback. Scaled down to 2560px on the long edge.' },
+      { name: 'jpeg_original', label: 'JPEG', dims: 'Max 2560px · web-ready', help: 'The universal fallback. Works everywhere, ideal for photographs. No transparency support. Scaled down to 2560px on the long edge.' },
+      { name: 'png_original', label: 'PNG', dims: 'Max 2560px · web-ready', help: 'Lossless with transparency. Best for logos, icons, and graphics with sharp edges or text. Larger than WebP. Scaled down to 2560px on the long edge.' },
     ],
   },
   {
diff --git a/go.mod b/go.mod
index 4126009..8335a55 100644
--- a/go.mod
+++ b/go.mod
@@ -7,7 +7,7 @@ require (
 	github.com/go-pdf/fpdf v0.9.0
 	github.com/gofiber/fiber/v3 v3.3.0
 	github.com/google/uuid v1.6.0
-	golang.org/x/sync v0.20.0
+	golang.org/x/sync v0.21.0
 )
 
 require (
diff --git a/go.sum b/go.sum
index eae0ee2..a74ff3e 100644
--- a/go.sum
+++ b/go.sum
@@ -48,6 +48,8 @@ golang.org/x/net v0.54.0 h1:2zJIZAxAHV/OHCDTCOHAYehQzLfSXuf/5SoL/Dv6w/w=
 golang.org/x/net v0.54.0/go.mod h1:Sj4oj8jK6XmHpBZU/zWHw3BV3abl4Kvi+Ut7cQcY+cQ=
 golang.org/x/sync v0.20.0 h1:e0PTpb7pjO8GAtTs2dQ6jYa5BWYlMuX047Dco/pItO4=
 golang.org/x/sync v0.20.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
+golang.org/x/sync v0.21.0 h1:HLII4xRRTtCRkxYp4HNFF0Js/Og6q2i++KXbg0gHCwM=
+golang.org/x/sync v0.21.0/go.mod h1:9xrNwdLfx4jkKbNva9FpL6vEN7evnE43NNNJQ2LF3+0=
 golang.org/x/sys v0.44.0 h1:ildZl3J4uzeKP07r2F++Op7E9B29JRUy+a27EibtBTQ=
 golang.org/x/sys v0.44.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
 golang.org/x/text v0.37.0 h1:Cqjiwd9eSg8e0QAkyCaQTNHFIIzWtidPahFWR83rTrc=
diff --git a/handlers/download.go b/handlers/download.go
index 583fbee..7d8b10f 100644
--- a/handlers/download.go
+++ b/handlers/download.go
@@ -23,12 +23,20 @@ func Download(store *Store) fiber.Handler {
 
 		outputs := job.Outputs()
 
+		// A finished job with no outputs means every preset failed (e.g. an
+		// undecodable input). runJob fails such jobs, but the endpoint is public,
+		// so guard here too: serve a 404 rather than a valid-but-empty ZIP, which
+		// would look like a successful download of nothing.
+		if len(outputs) == 0 {
+			return fiber.NewError(fiber.StatusNotFound, "job produced no output")
+		}
+
 		// Single-file fast path: when the job produced exactly one output file,
 		// return it raw (with its real content-type and filename) instead of a
 		// one-entry ZIP — the common "one image, one preset" case. A pack (favicon
 		// has many members) or bundle, or any job with 2+ outputs, still ZIPs.
 		if of, ok := soleImageOutput(outputs); ok {
-			c.Attachment(of.preset + extFor(of.format))
+			c.Attachment(entryName(of))
 			c.Type(extFor(of.format)) // sets Content-Type from the extension
 			freeIfRedownloaded(store, job, jobID)
 			return c.Send(of.data)
@@ -37,10 +45,6 @@ func Download(store *Store) fiber.Handler {
 		// Content-Disposition: attachment; filename="optimized.zip".
 		c.Attachment("optimized.zip")
 
-		// Whether to namespace entries by source filename depends on how many
-		// distinct sources contributed outputs.
-		multiSource := hasMultipleSources(outputs)
-
 		return c.SendStreamWriter(func(w *bufio.Writer) {
 			zw := zip.NewWriter(w)
 			for _, of := range outputs {
@@ -53,19 +57,18 @@ func Download(store *Store) fiber.Handler {
 					}
 					continue
 				}
-				// Pack presets (e.g. favicon) expand into a folder of members;
-				// normal presets are a single named entry.
+				// Pack presets (e.g. favicon) expand into a folder of members —
+				// a favicon set is a drop-in unit, so it stays grouped.
 				if len(of.pack) > 0 {
-					if err := writePack(zw, of, multiSource); err != nil {
+					if err := writePack(zw, of); err != nil {
 						break
 					}
 					continue
 				}
-				name := of.preset + extFor(of.format)
-				if multiSource {
-					name = path.Join(of.srcBase, name)
-				}
-				fw, err := zw.Create(name)
+				// Plain image outputs are flat at the ZIP root, named
+				// "<source>_<preset>.<ext>" (e.g. IMG_0274_convert_jpeg.jpg).
+				// Source name + preset keeps every entry unique without folders.
+				fw, err := zw.Create(entryName(of))
 				if err != nil {
 					break
 				}
@@ -95,15 +98,13 @@ func freeIfRedownloaded(store *Store, job *Job, jobID string) {
 	}
 }
 
-// writePack writes every member of a pack preset into the ZIP under a folder
-// named after the preset (e.g. "favicon/favicon.ico"). When the job has multiple
-// source files the folder is further namespaced by source base, mirroring the
-// single-file path. Any write error aborts the pack.
-func writePack(zw *zip.Writer, of outFile, multiSource bool) error {
-	dir := of.preset
-	if multiSource {
-		dir = path.Join(of.srcBase, of.preset)
-	}
+// writePack writes every member of a pack preset into the ZIP under a single
+// folder (e.g. "IMG_0274_favicon/favicon.ico"). A favicon set is a drop-in unit,
+// so its members stay grouped rather than flattened. The folder is named with the
+// same "<source>_<preset>" convention as flat entries, which keeps packs from
+// different sources from colliding. Any write error aborts the pack.
+func writePack(zw *zip.Writer, of outFile) error {
+	dir := entryBase(of)
 	for _, member := range of.pack {
 		fw, err := zw.Create(path.Join(dir, member.Name))
 		if err != nil {
@@ -133,27 +134,21 @@ func writeBundle(zw *zip.Writer, of outFile) error {
 	return nil
 }
 
-// hasMultipleSources reports whether the outputs came from more than one source
-// file, which determines whether ZIP entries are namespaced by source. Bundle
-// outputs are job-wide (empty srcBase) and are excluded — otherwise their empty
-// source would always register as a distinct source and force namespacing.
-func hasMultipleSources(outputs []outFile) bool {
-	var first string
-	seen := false
-	for _, of := range outputs {
-		if of.bundle {
-			continue
-		}
-		if !seen {
-			first = of.srcBase
-			seen = true
-			continue
-		}
-		if of.srcBase != first {
-			return true
-		}
+// entryBase returns the "<source>_<preset>" stem for an output's ZIP entry,
+// e.g. "IMG_0274_convert_jpeg". Source name and preset together keep every entry
+// unique without namespacing folders. If the source base is unknown (e.g. an
+// older job), it falls back to just the preset so the name is still valid.
+func entryBase(of outFile) string {
+	if of.srcBase == "" {
+		return of.preset
 	}
-	return false
+	return of.srcBase + "_" + of.preset
+}
+
+// entryName is entryBase plus the output's file extension, used for flat image
+// entries and the single-file fast path (e.g. "IMG_0274_convert_jpeg.jpg").
+func entryName(of outFile) string {
+	return entryBase(of) + extFor(of.format)
 }
 
 // soleImageOutput returns the single output and true when the job produced
diff --git a/handlers/download_test.go b/handlers/download_test.go
index f6d6e3f..91cc8fb 100644
--- a/handlers/download_test.go
+++ b/handlers/download_test.go
@@ -8,33 +8,40 @@ import (
 	"github.com/hra42/image-optimizer/processor"
 )
 
-func TestHasMultipleSources(t *testing.T) {
+// TestEntryName locks the flat "<source>_<preset>.<ext>" naming for image
+// entries: no namespacing folders, and source+preset together keep entries from
+// different sources unique even for the same preset.
+func TestEntryName(t *testing.T) {
 	tests := []struct {
-		name    string
-		outputs []outFile
-		want    bool
+		name string
+		of   outFile
+		want string
 	}{
-		{"empty", nil, false},
-		{"single source", []outFile{{srcBase: "a"}, {srcBase: "a"}}, false},
-		{"two sources", []outFile{{srcBase: "a"}, {srcBase: "b"}}, true},
 		{
-			// A bundle output has an empty srcBase; it must NOT be counted as a
-			// distinct source, or it would force every per-file output into a
-			// namespaced folder.
-			name:    "bundle ignored among single source",
-			outputs: []outFile{{srcBase: "a"}, {bundle: true}},
-			want:    false,
+			name: "source and preset",
+			of:   outFile{srcBase: "IMG_0274", preset: "convert_jpeg", format: processor.FormatJPEG},
+			want: "IMG_0274_convert_jpeg.jpg",
 		},
 		{
-			name:    "bundle ignored, real multi still detected",
-			outputs: []outFile{{srcBase: "a"}, {bundle: true}, {srcBase: "b"}},
-			want:    true,
+			name: "different source, same preset does not collide",
+			of:   outFile{srcBase: "IMG_0275", preset: "convert_jpeg", format: processor.FormatJPEG},
+			want: "IMG_0275_convert_jpeg.jpg",
+		},
+		{
+			name: "webp extension",
+			of:   outFile{srcBase: "photo", preset: "convert_webp", format: processor.FormatWebP},
+			want: "photo_convert_webp.webp",
+		},
+		{
+			// No source base (defensive fallback) → preset-only, still valid.
+			name: "missing source falls back to preset",
+			of:   outFile{preset: "convert_png", format: processor.FormatPNG},
+			want: "convert_png.png",
 		},
-		{"only a bundle", []outFile{{bundle: true}}, false},
 	}
 	for _, tt := range tests {
-		if got := hasMultipleSources(tt.outputs); got != tt.want {
-			t.Errorf("%s: hasMultipleSources = %v, want %v", tt.name, got, tt.want)
+		if got := entryName(tt.of); got != tt.want {
+			t.Errorf("%s: entryName = %q, want %q", tt.name, got, tt.want)
 		}
 	}
 }
@@ -108,11 +115,12 @@ func TestWriteBundleTopLevel(t *testing.T) {
 	}
 }
 
-// TestWritePackVsBundleNaming contrasts a pack (folder-namespaced) with a bundle
-// (top-level) so the divergence is locked in.
+// TestWritePackVsBundleNaming contrasts a pack (kept in a source-prefixed folder)
+// with a bundle (top-level) so the divergence is locked in.
 func TestWritePackVsBundleNaming(t *testing.T) {
 	pack := outFile{
-		preset: "favicon",
+		srcBase: "logo",
+		preset:  "favicon",
 		pack: []processor.OutputFile{
 			{Name: "favicon.ico", Data: []byte("ico")},
 		},
@@ -126,7 +134,7 @@ func TestWritePackVsBundleNaming(t *testing.T) {
 	}
 
 	names := writeToZip(t, func(zw *zip.Writer) {
-		if err := writePack(zw, pack, false); err != nil {
+		if err := writePack(zw, pack); err != nil {
 			t.Fatalf("writePack: %v", err)
 		}
 		if err := writeBundle(zw, bundle); err != nil {
@@ -135,8 +143,8 @@ func TestWritePackVsBundleNaming(t *testing.T) {
 	})
 
 	want := map[string]bool{
-		"favicon/favicon.ico":     true, // pack: under a preset folder
-		"linkedin_doc_square.pdf": true, // bundle: at the root
+		"logo_favicon/favicon.ico": true, // pack: under a "<source>_<preset>" folder
+		"linkedin_doc_square.pdf":  true, // bundle: at the root
 	}
 	if len(names) != len(want) {
 		t.Fatalf("ZIP entries = %v, want keys %v", names, want)
diff --git a/handlers/store.go b/handlers/store.go
index 96f2e2d..6bd097e 100644
--- a/handlers/store.go
+++ b/handlers/store.go
@@ -429,5 +429,17 @@ func runJob(job *Job, files []srcFile, imagePresets, bundlePresets []processor.P
 		}
 	}
 
+	// If every preset failed (e.g. an input format libvips can't decode, like
+	// HEIC when libheif is missing), job.outputs is empty. Finishing here would
+	// emit "complete" and hand the user a valid-but-empty ZIP with no error.
+	// Fail loudly instead — the frontend already surfaces the terminal "error".
+	job.mu.Lock()
+	empty := len(job.outputs) == 0
+	job.mu.Unlock()
+	if empty {
+		job.Fail()
+		return
+	}
+
 	job.Finish("/download/" + job.ID)
 }
diff --git a/processor/pipeline.go b/processor/pipeline.go
index c665061..ca6d108 100644
--- a/processor/pipeline.go
+++ b/processor/pipeline.go
@@ -63,7 +63,15 @@ func processImage(buf []byte, p Preset) Result {
 		// vector — libvips would otherwise rasterize at the document's intrinsic
 		// size, which for icon SVGs is often tiny. Render at a higher density so
 		// the output is a usable size while preserving the author's proportions.
+		// Checked before FitsWithin so a website_* SVG keeps the density bump
+		// (the 2560px cap would otherwise leave a small icon rasterized tiny).
 		img, err = loadSVGAtDensity(buf, svgRasterDensity)
+	case p.FitsWithin():
+		// Cap the long edge to a MaxDim×MaxDim box: InterestingNone fits the whole
+		// image inside (no crop), SizeDown only ever shrinks (a source already
+		// within the box passes through untouched). This is what makes website_*
+		// publish a 24MP phone photo at a web-performant size.
+		img, err = vips.NewThumbnailWithSizeFromBuffer(buf, p.MaxDim, p.MaxDim, vips.InterestingNone, vips.SizeDown)
 	default:
 		// website_* presets keep the source dimensions.
 		img, err = vips.NewImageFromBuffer(buf)
@@ -155,6 +163,14 @@ func resolveFormat(buf []byte) Format {
 		return FormatWebP
 	case vips.ImageTypeAVIF:
 		return FormatAVIF
+	case vips.ImageTypeHEIF:
+		// HEIC/HEIF (iPhone photos) is an HEVC-class codec with no encoder here,
+		// so "keep the source format" can't keep HEIC. Re-encoding to JPEG (the
+		// old default fall-through) actually grows the file, since JPEG is far
+		// less efficient. WebP is the most efficient format we can both write and
+		// serve broadly, so compress HEIC to WebP for real savings. (AVIF is
+		// available explicitly via convert_avif for anyone who wants it.)
+		return FormatWebP
 	case vips.ImageTypeSVG:
 		return FormatPNG
 	default:
diff --git a/processor/preset.go b/processor/preset.go
index 33a704d..454e1d3 100644
--- a/processor/preset.go
+++ b/processor/preset.go
@@ -74,6 +74,12 @@ type Preset struct {
 	Format      Format
 	Width       int // 0 = keep original
 	Height      int // 0 = keep original
+	// MaxDim caps the long edge: the image is scaled to fit within a
+	// MaxDim×MaxDim box, preserving aspect ratio, downscale-only (never enlarged,
+	// never cropped). 0 = no cap. Distinct from Width/Height, which crop-to-fill
+	// at exact dimensions. Used by the website_* presets so multi-megapixel phone
+	// photos come out web-performant instead of at full sensor resolution.
+	MaxDim      int
 	Quality     int
 	Progressive bool // JPEG interlace
 	Effort      int  // AVIF Effort / WebP ReductionEffort
@@ -150,6 +156,13 @@ func (p Preset) Resizes() bool {
 	return p.Width > 0 && p.Height > 0
 }
 
+// FitsWithin reports whether the preset caps the long edge to a bounding box
+// (downscale-only, aspect-preserving, no crop) rather than resizing to exact
+// dimensions. Resizes() (crop-to-fill) takes precedence when both are set.
+func (p Preset) FitsWithin() bool {
+	return p.MaxDim > 0 && !p.Resizes()
+}
+
 // IsBundle reports whether the preset consumes ALL uploaded files at once and
 // produces a single output for the whole job (rather than running per-file).
 // Bundle presets take a separate path through the orchestrator (see runJob's
@@ -187,15 +200,21 @@ type Result struct {
 // must not block for long. i is the preset's index in the input slice.
 type ResultFunc func(i int, r Result)
 
+// webMaxDim is the long-edge cap for the website_* presets: a common full-bleed
+// hero width that stays crisp on high-DPI displays while keeping files small
+// enough for good Core Web Vitals. Sources already smaller are not upscaled.
+const webMaxDim = 2560
+
 // presets is the canonical registry, defined once in spec order.
 var presets = []Preset{
-	{Name: "website_webp", Format: FormatWebP, Quality: 80},
-	{Name: "website_avif", Format: FormatAVIF, Quality: 60, Effort: 4},
-
-	// Full-size JPEG/PNG: optimize and strip metadata without resizing. The
-	// JPEG/PNG counterparts to website_webp/website_avif.
-	{Name: "jpeg_original", Format: FormatJPEG, Quality: 80, Progressive: true},
-	{Name: "png_original", Format: FormatPNG, Compression: 6},
+	// Website: web-ready output. The long edge is capped at 2560px (fit-inside,
+	// downscale-only) so multi-megapixel phone photos publish at a performant
+	// size instead of full sensor resolution — a 24MP HEIC drops from ~2MB to a
+	// few hundred KB. Smaller sources are left at their own size.
+	{Name: "website_webp", Format: FormatWebP, Quality: 80, MaxDim: webMaxDim},
+	{Name: "website_avif", Format: FormatAVIF, Quality: 60, Effort: 4, MaxDim: webMaxDim},
+	{Name: "jpeg_original", Format: FormatJPEG, Quality: 80, Progressive: true, MaxDim: webMaxDim},
+	{Name: "png_original", Format: FormatPNG, Compression: 6, MaxDim: webMaxDim},
 
 	// Convert: faithful, high-quality format conversion at the original size —
 	// the "just turn my iPhone HEIC into a usable file" path. Higher quality
diff --git a/processor/preset_test.go b/processor/preset_test.go
index 4155ccf..d8b9f50 100644
--- a/processor/preset_test.go
+++ b/processor/preset_test.go
@@ -7,10 +7,10 @@ import "testing"
 
 func TestAllPresetsMatchSpec(t *testing.T) {
 	want := map[string]Preset{
-		"website_webp":            {Name: "website_webp", Format: FormatWebP, Quality: 80},
-		"website_avif":            {Name: "website_avif", Format: FormatAVIF, Quality: 60, Effort: 4},
-		"jpeg_original":           {Name: "jpeg_original", Format: FormatJPEG, Quality: 80, Progressive: true},
-		"png_original":            {Name: "png_original", Format: FormatPNG, Compression: 6},
+		"website_webp":            {Name: "website_webp", Format: FormatWebP, Quality: 80, MaxDim: webMaxDim},
+		"website_avif":            {Name: "website_avif", Format: FormatAVIF, Quality: 60, Effort: 4, MaxDim: webMaxDim},
+		"jpeg_original":           {Name: "jpeg_original", Format: FormatJPEG, Quality: 80, Progressive: true, MaxDim: webMaxDim},
+		"png_original":            {Name: "png_original", Format: FormatPNG, Compression: 6, MaxDim: webMaxDim},
 		"convert_jpeg":            {Name: "convert_jpeg", Format: FormatJPEG, Quality: 92, Progressive: true},
 		"convert_png":             {Name: "convert_png", Format: FormatPNG, Compression: 6},
 		"convert_webp":            {Name: "convert_webp", Format: FormatWebP, Quality: 90},
@@ -84,12 +84,24 @@ func TestPresetByName(t *testing.T) {
 func TestResizes(t *testing.T) {
 	website, _ := PresetByName("website_webp")
 	if website.Resizes() {
-		t.Error("website_webp should keep original dimensions (Resizes()=false)")
+		t.Error("website_webp should not crop-to-fill (Resizes()=false)")
+	}
+	// website_* caps the long edge instead of cropping: FitsWithin, not Resizes.
+	if !website.FitsWithin() {
+		t.Error("website_webp should fit within a max box (FitsWithin()=true)")
 	}
 	ig, _ := PresetByName("instagram_square")
 	if !ig.Resizes() {
 		t.Error("instagram_square should crop to fixed dimensions (Resizes()=true)")
 	}
+	if ig.FitsWithin() {
+		t.Error("instagram_square crops to exact size, not a fit box (FitsWithin()=false)")
+	}
+	// A plain compress preset neither crops nor caps.
+	cb, _ := PresetByName("compress_balanced")
+	if cb.Resizes() || cb.FitsWithin() {
+		t.Error("compress_balanced should neither resize nor fit-within")
+	}
 }
 
 func TestIsBundle(t *testing.T) {