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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 | Compressor.io | CompressNow | Switch / compare |
|---|---|---|---|
| Image compression | 86/100 2048 × 2048 · PNG | 83/100 PNG · Output attached | Active task |
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Browse this task →| Criterion | Compressor.io Image compression 86/100 Seven-aspect task score Free size and Pro feature limits are disclosed upfront; login-free export retains full-size PNG with good quality, alongside banner ads. Tested export 2048 × 2048 · PNG Historical test · 2026-10-18 | CompressNow Image compression 83/100 Seven-aspect task score Free login-free on-device processing discloses format conversion upfront; size reduction is substantial, but PNG export is unavailable and transparency needs care. Tested export PNG · Output attached Historical test · 2026-10-18 |
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| Pricing & rules | ||
| Pricing plans | Compressor.io web plans (Free / Web Compressor Pro); USD · 2026-10-21 Plan · source date Monthly / one-time Annual bill / period Quota & limits Free2026-10-21 ↗ Free Free Free Free without login; max 10 MB per file, up to 50 compressions/day (supports JPEG/PNG/SVG/GIF/WEBP lossy and lossless modes). Web Compressor Pro2026-10-21 ↗ — USD 50/year Annual USD 50/year (1 user); max 20 MB per file, unlimited compressions, custom compression quality, image resizing, auto-rename, and no ads. Annual subscription; cancel anytime in the Account dashboard 2 plan / billing-period records, all listed; — means that period is not recorded. The official pricing page currently offers Free (max 10 MB per file, up to 50 lossy/lossless compressions per day) and Web Compressor Pro annual subscription (USD 50/year, max 20 MB per file, unlimited compressions, custom quality, image resizing, auto-rename, and no ads). Cancellation, sources & verification recordCancel anytime in the Account dashboard; official FAQ states a 7-day full refund with no questions asked (credit card refunds take 3–5 working days). Compressor.io official pricing and features comparison page ↗ · 2026-10-21 Capture 1 ↗ | Compressnow online in-browser image compressor · 2026-10-21 Plan · source date Monthly / one-time Annual bill / period Quota & limits Compressnow Free Web2026-10-21 ↗ Free Free Free Free without login; up to 30 MB per image and up to 30 images at a time; individual or ZIP download. 1 plan / billing-period records, all listed; — means that period is not recorded. The official page and FAQ state that compression runs in the browser (images are not stored), supporting up to 30 MB per image and up to 30 images at a time for JPG/JPEG/PNG/GIF/WebP (output as JPG or WebP), with no paid tiers. Cancellation, sources & verification recordCompletely free web tool with no accounts or subscription charges. Compressnow official tool page and FAQ ↗ · 2026-10-21 Capture 1 ↗ |
| Free & trial allowance on the test date | Free up to 10 MB per file with both Lossy and Lossless modes; Custom quality and image resizing require Pro | 100% free, up to 30 MB per image and up to 30 images per batch |
| Cancellation & refunds | Cancel anytime in the Account dashboard; official FAQ states a 7-day full refund with no questions asked (credit card refunds take 3–5 working days). | Completely free web tool with no accounts or subscription charges. |
| Disclosure of costs & limits | Discloses 'Max 10 MB' directly above the Select files button | Discloses upfront at the top of the page that output format is JPG or WebP ('Transparent areas turn white') |
| Task quality | ||
| Measured fixture results | File reduction: 47.38% · Output size: 2177.3 KB | File reduction: 85.99% · Output size: 579.8 KB |
| Fixture findings | Reduced this fixture by about 47% with gradients retained; the recorded free file limit was 10MB. | Local compression reduced this fixture by about 86%; export changes to JPG or WebP, not PNG. |
| Original historical observation | Compressor.io adopts a conservative high-fidelity strategy in default Lossy mode: compressing our 4,137.9 KB master to 2,177.3 KB (-47.38%, 02_workspace.png) while maintaining 38.39 dB PSNR and 0.9980 SSIM with smooth dark gradients and clear upfront 10 MB limit disclosure. | CompressNow is a fast, 100% client-side compressor: your image never leaves your browser, and in 0.9s it shrinks our 4.24 MB benchmark PNG to 579.8 KB (-85.99%, 7.14×) at 42.34 dB PSNR (02_workspace.png). Note that it only outputs JPG or WebP (disclosed upfront), so users with transparent PNGs should select the WebP toggle. |
| Suitable uses · historical assessment | Web designers compressing images under 10 MB who want high visual fidelity (PSNR > 38 dB) and easy switching between Lossy and Lossless modes | Users who want to rapidly shrink bulky PNG screenshots or photos locally in-browser into high-quality JPG or WebP (-86% size) without uploading files to any server |
| Result & output evidence | ||
| Delivery capabilities | ||
| Recorded export specifications | 2048 × 2048 · PNG · No watermark in test | PNG · Output attached · No watermark in test |
| Historical specification note · not an official maximum | 2048×2048 full-resolution PNG free direct export (up to 10 MB per file) | 2048×2048 full-resolution free export (outputs as JPG or WebP; does not export native PNG) |
| Watermark observation | Watermark-free | Watermark-free |
| Batch & API | Supports multi-file drag-and-drop and one-click Download All | Supports up to 30 images (≤30 MB each) with one-click DOWNLOAD ZIP |
| Recorded free-tier dimensions | 2048 × 2048 | 2048 × 2048 |
| Attached file dimensions | 2048 × 2048 · PNG | Not verified |
| Speed & reliability | ||
| Timing observation | Network-observed server wait: 8.4s · End-to-end reference: 10.5s | Recorded local processing time: 0.9s · End-to-end reference: 0.9s |
| Date & fixture | 2026-10-18 · anchor_compress_v1 · US-West (California, AS2914) | 2026-10-18 · 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 | No login required (email login for Pro subscribers) | No registration or login required (100% local tool) |
| Manual adjustment | Not verified | Not verified |
| Interaction observations | Displays Google AdSense banners above and below the workspace, but the orange 'Download' and 'Download All' buttons are clean and direct without registration popups (02_workspace.png, 03_download.png). | Clean single-page workspace with a live compression level slider (default 20%) and a single display ad banner, with zero popups or registration walls (02_workspace.png, 03_download.png). |
| Background & reputation | ||
| Service lifecycle notice | Not verified | Not verified |
| Operator | Compressor.io | CompressNow |
| Recorded origin | France / European Independent Tool Team | France / European Independent Developer |
| Domain history record | 2013–Present (13-year established image optimizer) | 2012–Present (14-year online image compression tool) |
| Background & reputation assessment | Well-known online image optimization service operating since 2013 with strong adoption among web designers and developers. | Classic multi-language online image weight reducer operating for over 10 years (currently V6.0). |
| External reputation record | Not verified | Not verified |
| Engineering & privacy | ||
| Processing location | Uploaded for cloud processing | On-device processing |
| Third-party tracking record | Not verified | Not verified |
| Engineering & privacy assessment | Supports anonymous no-login compression; temporary download links are cleaned up automatically after the session. | 100% local in-browser processing (`blob:https://compressnow.com/...`); FAQ explicitly states 'Compression runs in your browser: your images never leave your device.' |
| Retention statement | Explicit retention period unconfirmed; inspect policy record | This flow runs locally; post-close deletion not independently verified |
| Evaluation basis | ||
| Pricing transparency | 31 / 35 Clearly states 'compress jpg, png, gif, svg, webp. Max 10 MB.' inside the upload zone (01_landing.png); advanced custom resize and rename options are clearly badged 'PRO ONLY' upfront with zero post-upload paywall. | 31 / 35 100% free for up to 30 MB per image and 30 images at a time; transparently discloses next to the Format toggle: 'Format: JPG | WebP — Works everywhere. Transparent areas turn white.' (01_landing.png). |
| Interaction restraint | 25 / 30 Displays Google AdSense banners above and below the workspace, but the orange 'Download' and 'Download All' buttons are clean and direct without registration popups (02_workspace.png, 03_download.png). | 24 / 30 Clean single-page workspace with a live compression level slider (default 20%) and a single display ad banner, with zero popups or registration walls (02_workspace.png, 03_download.png). |
| Background & reputation | 18 / 20 Well-known online image optimization service operating since 2013 with strong adoption among web designers and developers. | 17 / 20 Classic multi-language online image weight reducer operating for over 10 years (currently V6.0). |
| Engineering & privacy | 14 / 15 Supports anonymous no-login compression; temporary download links are cleaned up automatically after the session. | 15 / 15 100% local in-browser processing (`blob:https://compressnow.com/...`); FAQ explicitly states 'Compression runs in your browser: your images never leave your device.' |
| Task quality | 55.5 / 65 Reduces file size by 47.38% (1.90×) while achieving 38.39 dB PSNR and 0.9980 SSIM with high visual fidelity (55.5/65) | 52.2 / 65 Shrinks file size by 85.99% (7.14×) at 42.34 dB PSNR and 0.9992 SSIM, though output format is converted to JPG or WebP (52.2/65) |
| Deliverable specifications | 18.5 / 20 Preserves full 2048×2048 resolution and native PNG format with one-click no-login download (18.5/20) | 15 / 20 Preserves full 2048×2048 dimensions and supports 30 MB files, but converts PNG inputs to JPG (or WebP) rather than native `.png` (15.0/20) |
| Processing speed | 11.5 / 15 Total cloud upload and optimization time ~10.5s (~8.4s pure server processing) (11.5/15) | 14 / 15 100% local browser Canvas compression with 0 bytes uploaded in ~0.9s (14.0/15) |
