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Test scope & comparison notes
These are recorded facts, not a unified ranking. Tested tiers and scope are not consistently recorded. Read pricing with its date and timing with its conditions. Privacy observations reflect visible flows and statements, not a security audit.
Cross-task capability coverage across selected products
Each product is scored independently per task edge; switch tasks below while keeping shared products selected| Task edge | Squoosh | aconvert.com | Switch / compare |
|---|---|---|---|
| Image compression | 97/100 JPEG · Output attached | 86/100 2048 × 2048 · PNG | Active task |
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Browse this task →| Criterion | Squoosh (Google Chrome Labs) Image compression 97/100 Seven-aspect task score Free, open-source, login-free and ad-free on-device processing suits privacy and fine control; results depend on the chosen codec and settings. Tested export JPEG · Output attached Historical test · 2026-10-18 | Aconvert Image compression 86/100 Seven-aspect task score 100% free with no login, reducing the 4.14 MB anchor by 56.5% to 1.80 MB at PSNR 36.1 dB with full-resolution unwatermarked output. Tested export 2048 × 2048 · PNG Historical test · 2026-11-01 |
|---|---|---|
| Pricing & rules | ||
| Pricing plans | Squoosh in-browser local image compressor; open-source free · 2026-10-21 Plan · source date Monthly / one-time Annual bill / period Quota & limits Squoosh Web (Open-source free)2026-10-21 ↗ Free Free Free Completely free without login; local browser processing with no usage-count or file-size hard caps and full-resolution unwatermarked export. 1 plan / billing-period records, all listed; — means that period is not recorded. The official page states that all work runs locally in the browser so images never leave the device; it is an Apache-2.0 open-source tool with no paid tiers or in-app purchases. Cancellation, sources & verification recordCompletely free open-source tool with no accounts or subscription charges. Squoosh official page and open-source notice ↗ · 2026-10-21 Capture 1 ↗ | Aconvert 100% free file conversion and compression service · 2026-11-01 Plan · source date Monthly / one-time Annual bill / period Quota & limits Free2026-11-01 ↗ Free Free Free 100% free without login, 40MB per file, up to 10 files per batch Full access to multi-format conversion and compression across documents, media, eBooks, and archives；40MB per-file limit, 10 files per batch, display ads present；Permanently free, no renewal；Perpetual access 1 plan / billing-period records, all listed; — means that period is not recorded. All conversion and compression features are 100% free with ad and voluntary donation support; 40MB per-file limit (up to 10 files per batch) with zero paid plans or paywalls. Cancellation, sources & verification recordCancellation and refund terms unverified Aconvert Official Homepage ↗ · 2026-11-01 Capture 1 ↗ Aconvert About and Free Model ↗ · 2026-11-01 Capture 1 ↗ |
| Free & trial allowance on the test date | Unlimited free forever with no daily count or file size caps | Completely free, 40MB per file limit, up to 10 files per batch |
| Cancellation & refunds | Completely free open-source tool with no accounts or subscription charges. | Not verified |
| Disclosure of costs & limits | Original size, compressed size, and reduction percentage are displayed in real time on drop | Compression parameters and instructions clearly disclosed on page |
| Task quality | ||
| Measured fixture results | File reduction: 93.26% · Output size: 278.8 KB | File reduction: 56.5% · Output size: 1800.1 KB |
| Fixture findings | Local processing reduced this fixture by about 93%; results depend on the codec and settings. | Over 50% size reduction while preserving 2048px resolution and transparency; solid quality and easy to use. |
| Original historical observation | Squoosh is the gold standard of honest online utilities: uploading 0 bytes to any server, its local WebAssembly engine compresses our 4.24 MB 2048×2048 anchor image down to 278.8 KB (-93.26%) in 0.85s while maintaining PSNR=37.13 dB and SSIM=0.9973 (02_workspace.png). | Aconvert processes compression on cloud servers, reducing the 4.14 MB anchor by 56.5% to 1.80 MB under default Lossy 80 while maintaining SSIM 0.9966 and preserving micro-textures. |
| Suitable uses · historical assessment | Privacy-conscious users, developers, and designers who refuse to upload sensitive photos to cloud servers and want fine-grained codec control with real-time split-screen preview | Users and webmasters needing fast free image compression while preserving transparency and 2048px original resolution |
| Result & output evidence | ||
| Delivery capabilities | ||
| Recorded export specifications | JPEG · Output attached · No watermark in test | 2048 × 2048 · PNG · No watermark in test |
| Historical specification note · not an official maximum | 2048×2048 (unlimited dimensions, local WebAssembly zero-watermark export) | 2048 x 2048 (Full-resolution unwatermarked PNG) |
| Watermark observation | Watermark-free | No watermark |
| Batch & API | Focused on single-image interactive codec tuning | Supports up to 10 files concurrent upload with multi-format conversion |
| Recorded free-tier dimensions | 2048 × 2048 | 2048 × 2048 |
| Attached file dimensions | Not verified | 2048 × 2048 · PNG |
| Speed & reliability | ||
| Timing observation | Recorded local processing time: 0.85s · End-to-end reference: 0.85s | Network-observed server wait: 11.2s · End-to-end reference: 14.7s |
| Date & fixture | 2026-10-18 · anchor_compress_v1 · US-West (California, AS2914) | 2026-11-01 · anchor_compress_v1 · US-West (California, AS2914) |
| Repeated tests & reliability | No standardized repetition count, success rate or variability range is recorded. | No standardized repetition count, success rate or variability range is recorded. |
| Interaction experience | ||
| Account requirements | No login in this test | No login in this test |
| Sign-in methods | 100% No Login Required (no account system, pure client-side browser utility) | All platform features accessible directly without registration or login |
| Manual adjustment | Not verified | Not verified |
| Interaction observations | Zero sign-up, zero popups, and zero ad trackers—opens directly into a millisecond-responsive split-screen comparison workspace. | Not verified |
| Background & reputation | ||
| Service lifecycle notice | Not verified | Not verified |
| Operator | Google Chrome Labs | Aconvert Project (PDFConvertOnline.com) |
| Recorded origin | Mountain View, California, USA | United States |
| Domain history record | 2018–Present (maintained by Google Chrome DevRel) | Development team active since 2000 |
| Background & reputation assessment | Created and open-sourced by the Google Chrome Web DevRel team as the reference WebAssembly image codec playground. | Not verified |
| External reputation record | Not verified | Not verified |
| Engineering & privacy | ||
| Processing location | On-device processing | Uploaded for cloud processing |
| Third-party tracking record | Not verified | Google AdSense · Google Analytics |
| Engineering & privacy assessment | CDP network capture confirms 100% client-side WebAssembly execution (MozJPEG / OxiPNG / WebP / AVIF) with 0 bytes uploaded to any remote server; works offline as a PWA. | Not verified |
| Retention statement | This flow runs locally; post-close deletion not independently verified | Claims deletion within 2 hours; deletion not independently verified |
| Evaluation basis | ||
| Pricing transparency | 35 / 35 100% open-source and free with zero paywalls, zero in-app purchases, zero resolution caps, and zero ads. Dragging in the 4.24 MB (2048×2048) anchor image immediately enables real-time split-slider comparison and one-click export (01_landing.png, 02_workspace.png, 03_download.png). | |
| Interaction restraint | 30 / 30 Zero sign-up, zero popups, and zero ad trackers—opens directly into a millisecond-responsive split-screen comparison workspace. | |
| Background & reputation | 19.5 / 20 Created and open-sourced by the Google Chrome Web DevRel team as the reference WebAssembly image codec playground. | |
| Engineering & privacy | 14.5 / 15 CDP network capture confirms 100% client-side WebAssembly execution (MozJPEG / OxiPNG / WebP / AVIF) with 0 bytes uploaded to any remote server; works offline as a PWA. | |
| Task quality | 61.6 / 65 Reduces file size by 93.26% (4,137.9 KB → 278.8 KB, 14.84× compression ratio) while preserving PSNR = 37.13 dB and SSIM = 0.9973, with full control over OxiPNG, MozJPEG, WebP, and AVIF encoders (61.6/65) | 56 / 65 Size Reduction: -56.5% (4137.9 KB → 1800.1 KB, 2.3× ratio) · PSNR: 36.1 dB · SSIM: 0.9966 |
| Deliverable specifications | 20 / 20 Preserves exact 2048×2048 dimensions (unless Resize is toggled by the user) with unrestricted local PNG/JPEG/WebP/AVIF download (20.0/20) | 20 / 20 Clean unwatermarked export (8/8); Export spec: 2048 x 2048 (Full-resolution unwatermarked PNG) |
| Processing speed | 14 / 15 100% local multi-threaded WebAssembly encoding with 0.0s network upload latency; re-encodes the 2048×2048 anchor in ~0.85s (14.0/15) | 8.5 / 15 Network-observed server wait: 11.2s (API mode: cloud_server; network upload 3.5s / end-to-end 14.7s shown for reference only, never penalized) |
