{
 "meta": {
  "title": "Same 20 images, six free online image compressors",
  "measured_on": "2026-10-06",
  "browsers": {
   "minipx": "Chromium 145.0.7632.6",
   "squoosh": "Chromium 145.0.7632.6",
   "tinypng": "Chromium 145.0.7632.6",
   "freeconvert": "Chromium 145.0.7632.6",
   "imagecompressor": "Chromium 145.0.7632.6",
   "compressjpeg": "Chromium 145.0.7632.6"
  },
  "minipx_commit": "21021837",
  "minipx_engine_sha256": "4dfd54efdfa7d64be3602a8688763a0262e6fb9f6818007b56bf947d7251e2d8",
  "scripts": "scripts/bench/benchmark-2026-10/",
  "settings": "each tool's defaults as it opens; no account; one file at a time",
  "pace_seconds": 12,
  "ssim": "luma (BT.601 Y), skimage.metrics.structural_similarity, 7x7 window, data_range 255",
  "psnr": "RGB, skimage.metrics.peak_signal_noise_ratio, data_range 255",
  "seconds": "from the moment the tool starts work (its Compress click, or the file hand-over where the tool starts on its own) to a download being ready; page load excluded; one run per file on one machine (Apple silicon laptop, home connection) — indicative, not a speed ranking",
  "common_set": [
   "phone",
   "portrait",
   "lowlight",
   "detail",
   "product",
   "macro",
   "architecture",
   "animal",
   "artwork"
  ]
 },
 "corpus": [
  {
   "id": "phone",
   "label": "12 MP phone photo (cats, daylight)",
   "kind": "wikimedia",
   "page": "https://commons.wikimedia.org/wiki/File:Chattes_sur_sol_sec.jpg",
   "license": "CC0",
   "author": "Eruditus capra",
   "from": null,
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   "in_bytes": 3908645,
   "in_format": "jpeg",
   "in_w": 4032,
   "in_h": 3024
  },
  {
   "id": "portrait",
   "label": "Portrait / headshot",
   "kind": "wikimedia",
   "page": "https://commons.wikimedia.org/wiki/File:Zachary_Garmers_Headshot_(2023).jpg",
   "license": "CC0",
   "author": "Halfsquareprints",
   "from": null,
   "sha256": "62623f36d94ff9822b3fb6ab7ea19836fb211c2777ca58299f97df02b1249f7b",
   "in_bytes": 2355003,
   "in_format": "jpeg",
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   "in_h": 4653
  },
  {
   "id": "lowlight",
   "label": "Low light (street at night)",
   "kind": "wikimedia",
   "page": "https://commons.wikimedia.org/wiki/File:Bourbon_Street_at_night_Nov_2005.jpg",
   "license": "CC0",
   "author": "Daquella manera",
   "from": null,
   "sha256": "0946566b068fbef5cde28cd2c13a1577aaa4a598693a479046b0e1671e7e9a84",
   "in_bytes": 1380681,
   "in_format": "jpeg",
   "in_w": 3264,
   "in_h": 2448
  },
  {
   "id": "detail",
   "label": "Fine detail (mountain landscape)",
   "kind": "wikimedia",
   "page": "https://commons.wikimedia.org/wiki/File:Marmolada,_Italy.jpg",
   "license": "CC0",
   "author": "Marco Bonomo",
   "from": null,
   "sha256": "be834b795e32b38b3a33a890566ac7b3a8a8e4be03a29be52147b8f8aad6dfc2",
   "in_bytes": 3396302,
   "in_format": "jpeg",
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   "in_h": 2604
  },
  {
   "id": "product",
   "label": "Product shot",
   "kind": "wikimedia",
   "page": "https://commons.wikimedia.org/wiki/File:EOS_lip_balm_1.jpg",
   "license": "CC0",
   "author": "W.carter",
   "from": null,
   "sha256": "85f294ff9f20e86baec594e1e8a353c475644c11df6a9d77c552a51fef9acc87",
   "in_bytes": 2721469,
   "in_format": "jpeg",
   "in_w": 4419,
   "in_h": 2946
  },
  {
   "id": "macro",
   "label": "24 MP macro (orchid)",
   "kind": "wikimedia",
   "page": "https://commons.wikimedia.org/wiki/File:Vibrant_purple_orchid_flowers_macro_shot.jpg",
   "license": "CC0",
   "author": "Cyrill",
   "from": null,
   "sha256": "8ef4397db0dbb0fa97ec7c7e3363508260dc492ae833f3da37205bd7426c5526",
   "in_bytes": 1285853,
   "in_format": "jpeg",
   "in_w": 4000,
   "in_h": 6000
  },
  {
   "id": "architecture",
   "label": "Architecture (staircase)",
   "kind": "wikimedia",
   "page": "https://commons.wikimedia.org/wiki/File:Staircase_of_the_BGK_Building_(26620981474).jpg",
   "license": "CC0",
   "author": "Bart Lumber",
   "from": null,
   "sha256": "648d1796c96a95a60c1b56263ecd2a567cf5465f74dfdc1bf2d7d99baa837d4a",
   "in_bytes": 1336320,
   "in_format": "jpeg",
   "in_w": 3840,
   "in_h": 2160
  },
  {
   "id": "animal",
   "label": "Animal (soft fur, shallow focus)",
   "kind": "wikimedia",
   "page": "https://commons.wikimedia.org/wiki/File:Chinese_TianYuan_Dog_Sleeping.jpg",
   "license": "CC0",
   "author": "3dman_eu, dibatian",
   "from": null,
   "sha256": "e878a6ae3eed27f8ba6663b4e76a359cd5dce6feeab6f4cfec9edb0337899728",
   "in_bytes": 4167804,
   "in_format": "jpeg",
   "in_w": 4752,
   "in_h": 3168
  },
  {
   "id": "artwork",
   "label": "Painting reproduction (museum scan)",
   "kind": "wikimedia",
   "page": "https://commons.wikimedia.org/wiki/File:Mountain_Landscape,_Lombardy_MET_203199.jpg",
   "license": "CC0",
   "author": "John Frederick Kensett (The Met, Open Access)",
   "from": null,
   "sha256": "009bc4509152cbab6e761809fd171af297c0343010e1eca8dc54b5cc373e4833",
   "in_bytes": 956956,
   "in_format": "jpeg",
   "in_w": 2471,
   "in_h": 1989
  },
  {
   "id": "scan_letter",
   "label": "Scanned handwritten page",
   "kind": "wikimedia",
   "page": "https://commons.wikimedia.org/wiki/File:Elizabeth_Polwhele_The_frolicks_letter_page_1_RMC2018_0434.jpg",
   "license": "CC0",
   "author": "Elizabeth Polwhele, manuscript",
   "from": null,
   "sha256": "702534dd80180750cfd1dc733255394fd849072b64e7806fb27f31bef7244f48",
   "in_bytes": 2270173,
   "in_format": "jpeg",
   "in_w": 3349,
   "in_h": 4281
  },
  {
   "id": "scan_signature",
   "label": "Scanned signature",
   "kind": "wikimedia",
   "page": "https://commons.wikimedia.org/wiki/File:Signature_Yuri_Gagarin.jpg",
   "license": "Public domain",
   "author": "scan by Dmitry Makeev",
   "from": null,
   "sha256": "23f92051b602faaf4526d25f2ad4c2ebf7d4da12b96ebce7ffc7e21de50d171c",
   "in_bytes": 111738,
   "in_format": "jpeg",
   "in_w": 2041,
   "in_h": 617
  },
  {
   "id": "web_jpeg",
   "label": "Already-compressed web JPEG (1600 px, q75)",
   "kind": "derived",
   "page": null,
   "license": "CC0",
   "author": "derived from Bart Lumber (CC0)",
   "from": "architecture",
   "sha256": "ef57527805b39c55a7aa23f5acb7a02cc23cf62d0b6a3ee0c89350e3c29e673b",
   "in_bytes": 51024,
   "in_format": "jpeg",
   "in_w": 1600,
   "in_h": 900
  },
  {
   "id": "exif_rotated",
   "label": "EXIF-rotated JPEG (Orientation 6)",
   "kind": "derived",
   "page": null,
   "license": "CC0",
   "author": "derived from W.carter (CC0)",
   "from": "product",
   "sha256": "eea157bc2ae2eb132381e56a328eed3524e9854133d8102f459ef0683460c9c2",
   "in_bytes": 325112,
   "in_format": "jpeg",
   "in_w": 2000,
   "in_h": 3000
  },
  {
   "id": "png_photo",
   "label": "Photo saved as PNG (1600 px)",
   "kind": "derived",
   "page": null,
   "license": "CC0",
   "author": "derived from Daquella manera (CC0)",
   "from": "lowlight",
   "sha256": "f582d9733f519db2086fad315c979913eaa8ecf07e38b266c6eb63c15d0b06cf",
   "in_bytes": 3207121,
   "in_format": "png",
   "in_w": 1600,
   "in_h": 1200
  },
  {
   "id": "screenshot_light",
   "label": "Screenshot, light UI (PNG)",
   "kind": "generated",
   "page": null,
   "license": "CC0",
   "author": "MiniPx (generated)",
   "from": null,
   "sha256": "b8a1cd5b03d27cea454882bd6deba415d7110da8397895bc84b94eda070e0f53",
   "in_bytes": 69482,
   "in_format": "png",
   "in_w": 1440,
   "in_h": 900
  },
  {
   "id": "screenshot_dark",
   "label": "Screenshot, dark code editor (PNG)",
   "kind": "generated",
   "page": null,
   "license": "CC0",
   "author": "MiniPx (generated)",
   "from": null,
   "sha256": "2e153a064f524951ab9bf5fa88b8d7a00890d61b63f44338da4f5b2bac83cd49",
   "in_bytes": 70752,
   "in_format": "png",
   "in_w": 1440,
   "in_h": 900
  },
  {
   "id": "line_chart",
   "label": "Line graphic (chart, PNG)",
   "kind": "generated",
   "page": null,
   "license": "CC0",
   "author": "MiniPx (generated)",
   "from": null,
   "sha256": "c2cc811747e3ced3120664233630e049055ee1efa8ac2cda822f8a65af499931",
   "in_bytes": 33870,
   "in_format": "png",
   "in_w": 1600,
   "in_h": 1000
  },
  {
   "id": "flat_logo",
   "label": "Flat logo (PNG, 4 colours)",
   "kind": "generated",
   "page": null,
   "license": "CC0",
   "author": "MiniPx (generated)",
   "from": null,
   "sha256": "2db5f80d1761037c62daccde2124ac9dd9064898c10d2f5f26d274e4bfd30953",
   "in_bytes": 9202,
   "in_format": "png",
   "in_w": 1024,
   "in_h": 1024
  },
  {
   "id": "gradient",
   "label": "Smooth gradient (PNG)",
   "kind": "generated",
   "page": null,
   "license": "CC0",
   "author": "MiniPx (generated)",
   "from": null,
   "sha256": "c32baa1cbd82b2e43674180c47608feaa884703b90ddecfd61b0f1bbe0bae3ec",
   "in_bytes": 55077,
   "in_format": "png",
   "in_w": 1920,
   "in_h": 1080
  },
  {
   "id": "alpha_png",
   "label": "PNG with transparency (soft shadow)",
   "kind": "generated",
   "page": null,
   "license": "CC0",
   "author": "MiniPx (generated)",
   "from": null,
   "sha256": "b910a7880a583137b21d246a8b9ce872a2916eaaa2ed7f2000c94dba9910f15a",
   "in_bytes": 61936,
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   "in_w": 1200,
   "in_h": 1200
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 ],
 "tools": [
  {
   "id": "minipx",
   "name": "MiniPx",
   "url": "https://minipx.com/",
   "processing": "browser",
   "claim_quote": "Your image files never leave your browser.",
   "claim_url": "https://minipx.com/privacy/",
   "terms_url": "https://minipx.com/terms/",
   "terms_relied_on": "Our own product; measured on a local build so no visit or usage beacon reached production.",
   "signup": "none",
   "watermark": "none on compression output",
   "free_limits": "5 files per batch on the free tier; no daily cap",
   "limits_url": "https://minipx.com/",
   "defaults": "Auto format, quality 0.65 (the homepage compressor as it opens)",
   "observed": {
    "offline_ok_files": 2,
    "offline_tried": 2,
    "wire_files": 0,
    "wire_binary_posts": 0,
    "wire_file_sized_bodies": 0,
    "outputs_from_tool_server": 0,
    "outputs_made_in_page": 20,
    "verdict": "browser"
   }
  },
  {
   "id": "squoosh",
   "name": "Squoosh",
   "url": "https://squoosh.app/",
   "processing": "browser",
   "claim_quote": "Squoosh does not send your image to a server. All image compression processes locally.",
   "claim_url": "https://github.com/GoogleChromeLabs/squoosh/blob/dev/README.md",
   "terms_url": "https://github.com/GoogleChromeLabs/squoosh/blob/dev/LICENSE",
   "terms_relied_on": "Apache License 2.0, open source; the app has no terms of use restricting automated use.",
   "signup": "none",
   "watermark": "none",
   "free_limits": "one image at a time",
   "limits_url": "https://squoosh.app/",
   "defaults": "right-hand panel as it opens: MozJPEG, quality 75, no resize",
   "observed": {
    "offline_ok_files": 2,
    "offline_tried": 2,
    "wire_files": 0,
    "wire_binary_posts": 0,
    "wire_file_sized_bodies": 0,
    "outputs_from_tool_server": 0,
    "outputs_made_in_page": 20,
    "verdict": "browser"
   }
  },
  {
   "id": "tinypng",
   "name": "TinyPNG",
   "url": "https://tinypng.com/",
   "processing": "server",
   "claim_quote": "Images uploaded to the Service are temporarily stored, optimized and deleted within 48 hours.",
   "claim_url": "https://tinify.com/terms",
   "terms_url": "https://tinify.com/terms",
   "terms_relied_on": "Limits: “You acknowledge and agree that Tinify imposes a limit on the size and the number of requests you may send to the Service.” No clause on automated use, benchmarking or publishing results.",
   "signup": "none for the free web tool",
   "watermark": "none",
   "free_limits": "“Free users have the flexibility to upload up to 20 images at once, each with a maximum size of 5MB.”",
   "limits_url": "https://tinypng.com/",
   "defaults": "compress, keep the input format",
   "observed": {
    "offline_ok_files": 0,
    "offline_tried": 0,
    "wire_files": 1,
    "wire_binary_posts": 1,
    "wire_file_sized_bodies": 0,
    "outputs_from_tool_server": 20,
    "outputs_made_in_page": 0,
    "verdict": "server"
   }
  },
  {
   "id": "freeconvert",
   "name": "FreeConvert",
   "url": "https://www.freeconvert.com/image-compressor",
   "processing": "server",
   "claim_quote": "Files uploaded to FreeConvert are automatically and permanently deleted after 8 hours.",
   "claim_url": "https://www.freeconvert.com/privacy",
   "terms_url": "https://www.freeconvert.com/terms",
   "terms_relied_on": "“As a condition of your use of this website, you warrant that you will not use this website for any purpose that is unlawful or prohibited by these terms of use.” The commercial-use bar covers FreeConvert’s own copyright material (site content), none of which is reproduced here; the corpus is CC0.",
   "signup": "none",
   "watermark": "none",
   "free_limits": "“Max file size 1GB.”",
   "limits_url": "https://www.freeconvert.com/image-compressor",
   "defaults": "Advanced settings left closed",
   "observed": {
    "offline_ok_files": 0,
    "offline_tried": 0,
    "wire_files": 0,
    "wire_binary_posts": 0,
    "wire_file_sized_bodies": 0,
    "outputs_from_tool_server": 9,
    "outputs_made_in_page": 0,
    "verdict": "server"
   }
  },
  {
   "id": "imagecompressor",
   "name": "imagecompressor.com",
   "url": "https://imagecompressor.com/",
   "processing": "browser",
   "claim_quote": "Your files never leave your device. All processing is performed locally in your browser using WebAssembly. No server-side processing is involved.",
   "claim_url": "https://imagecompressor.com/terms",
   "terms_url": "https://imagecompressor.com/terms",
   "terms_relied_on": "“You may use the imagecompressor.com service for any purpose, personal or commercial.”",
   "signup": "none",
   "watermark": "none",
   "free_limits": "“No registration required, no daily limits, no watermarks.”",
   "limits_url": "https://imagecompressor.com/",
   "defaults": "the quality the tool picks per file",
   "observed": {
    "offline_ok_files": 0,
    "offline_tried": 2,
    "wire_files": 2,
    "wire_binary_posts": 0,
    "wire_file_sized_bodies": 0,
    "outputs_from_tool_server": 0,
    "outputs_made_in_page": 20,
    "verdict": "browser"
   }
  },
  {
   "id": "compressjpeg",
   "name": "compressjpeg.com",
   "url": "https://compressjpeg.com/",
   "processing": "browser",
   "claim_quote": "Your files never leave your device. All processing is performed locally in your browser using WebAssembly. No server-side processing is involved.",
   "claim_url": "https://compressjpeg.com/terms",
   "terms_url": "https://compressjpeg.com/terms",
   "terms_relied_on": "“You may use the compressjpeg.com service for any purpose, personal or commercial.”",
   "signup": "none",
   "watermark": "none",
   "free_limits": "JPEG input only (its file input accepts .jpg and .jpeg)",
   "limits_url": "https://compressjpeg.com/",
   "defaults": "the quality the tool picks per file",
   "observed": {
    "offline_ok_files": 0,
    "offline_tried": 2,
    "wire_files": 2,
    "wire_binary_posts": 0,
    "wire_file_sized_bodies": 0,
    "outputs_from_tool_server": 0,
    "outputs_made_in_page": 13,
    "verdict": "browser"
   }
  }
 ],
 "excluded": [
  {
   "name": "iLoveIMG",
   "url": "https://www.iloveimg.com/compress-image",
   "terms_url": "https://www.iloveimg.com/help/terms",
   "reason": "Its terms bar reverse engineering “including, but not limited to, monitoring or tracking inputs and outputs flowing through a system or application” and extracting data “for data mining purposes” without written permission. Measuring inputs against outputs is close enough to that wording that we did not run it."
  },
  {
   "name": "11zon",
   "url": "https://www.11zon.com/en/image-compress/",
   "terms_url": "https://policies.11zon.com/en/terms/",
   "reason": "Its terms say “You agree not to reproduce, duplicate, copy, modify, stream, sell, resell or exploit any part of the Service, use of the Service or access to the Service and Content.” Publishing measurements of the service on a competing site could be read as exploiting its use, so we did not run it."
  },
  {
   "name": "Compressor.io",
   "url": "https://compressor.io/",
   "terms_url": null,
   "reason": "Answered HTTP 403 to plain requests on 2026-10-06, so its terms could not be read; not run."
  },
  {
   "name": "Optimizilla",
   "url": "https://optimizilla.com/",
   "terms_url": null,
   "reason": "Not counted separately: Optimizilla's compressor now runs at imagecompressor.com, which is measured above (our own earlier comparison page already linked there as Optimizilla's home). optimizilla.com itself did not answer (connection timed out) on 2026-10-06."
  }
 ],
 "rows": [
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   "tool": "minipx",
   "source": "phone",
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   "status": "ok",
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   "out_format": "avif",
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   "saved_pct": 74.5,
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   "seconds": 6.2,
   "upload_observed": false,
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   "tool": "minipx",
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  {
   "tool": "minipx",
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  {
   "tool": "minipx",
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   "status": "ok",
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   "seconds": 1.9,
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  {
   "tool": "minipx",
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   "status": "ok",
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   "out_format": "avif",
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   "ssim": 0.9755,
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