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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 | Optimizilla | ResizePixel | Switch / compare |
|---|---|---|---|
| Image compression | 88/100 2048 × 2048 · PNG | 85/100 2048 × 2048 · PNG | Active task |
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Browse this task →| Criterion | Optimizilla (ImageCompressor.com) Image compression 88/100 Seven-aspect task score Free login-free on-device processing offers color controls and about 58% PNG reduction; download-like and fullscreen ads create misclick risk. Tested export 2048 × 2048 · PNG Historical test · 2026-10-18 | ResizePixel Image Compressor Image compression 85/100 Seven-aspect task score Free login-free target-size compression preserves quality and offers deletion; extension ads on the download page can be confused with the real button. Tested export 2048 × 2048 · PNG Historical test · 2026-10-18 |
|---|---|---|
| Pricing & rules | ||
| Pricing plans | ImageCompressor.com in-browser online image compressor · 2026-10-21 Plan · source date Monthly / one-time Annual bill / period Quota & limits Free Browser Compressor2026-10-21 ↗ Free Free Free Free without login; local browser processing for JPEG/PNG/WebP/GIF/SVG with batch compression and per-image quality tuning. 1 plan / billing-period records, all listed; — means that period is not recorded. The official page states that this free online tool runs entirely in the browser with no server uploads required, supporting batch JPEG, PNG, WebP, GIF, and SVG compression with per-image quality tuning, supported by display ads. Cancellation, sources & verification recordAd-supported free tool with no accounts or subscription charges. ImageCompressor.com official page and instructions ↗ · 2026-10-21 Capture 1 ↗ | ResizePixel online image compressor and editor web tool · 2026-10-21 Plan · source date Monthly / one-time Annual bill / period Quota & limits ResizePixel Free Web2026-10-21 ↗ Free Free Free Free without login for JPG/PNG/WEBP/GIF; supports auto compression and target KB/MB compression with unwatermarked export. 1 plan / billing-period records, all listed; — means that period is not recorded. The official tool page provides free, no-login online compression for JPG, PNG, WEBP, and GIF images (with auto optimization or target KB/MB compression), supported by display ads without a paywall. Cancellation, sources & verification recordAd-supported free tool with no accounts or subscription charges. ResizePixel official online image compressor page ↗ · 2026-10-21 Capture 1 ↗ |
| Free & trial allowance on the test date | Supports multi-file batch drag-and-drop and per-image palette color tuning (2–256 colors) with no daily cap | 100% free with both Auto high-fidelity compression and exact Target KB/MB compression |
| Cancellation & refunds | Ad-supported free tool with no accounts or subscription charges. | Ad-supported free tool with no accounts or subscription charges. |
| Disclosure of costs & limits | All features and sliders are unlocked upfront with zero hidden paywalls | 100% free throughout the entire workflow |
| Task quality | ||
| Measured fixture results | File reduction: 57.64% · Output size: 1752.7 KB | File reduction: 49.63% · Output size: 2084.2 KB |
| Fixture findings | Offers before/after preview and colour adjustment; distinguish nearby ad buttons from the real download. | Reduced this fixture by about 50% with detail retained; avoid the sidebar ad resembling a download button. |
| Original historical observation | Optimizilla (imagecompressor.com) shines with its interactive Before/After comparison canvas and 'Colors: 224' fine-tuning slider, shrinking our 4.14 MB anchor by 57.64% to 1.75 MB at PSNR=38.98 dB; however, users must watch out for two green 'DOWNLOAD EXTENSION' fake download ad banners directly above and below the workspace (01_landing.png, 02_workspace.png). | ResizePixel delivers remarkable quality in Auto (keep the quality) mode: shrinking our 4,137.9 KB PNG by 49.63% to 2,084.2 KB in 7.6s while maintaining a near-lossless 43.94 dB PSNR and 0.9994 SSIM (02_workspace.png). Users just need to ignore the green 'DOWNLOAD EXTENSION' ad on the left and click the real 'Go to Download / Download Image' button at the bottom right (03_download.png). |
| Suitable uses · historical assessment | Users who want to manually fine-tune PNG palette color counts (2–256 colors) with a live Before/After preview—provided they avoid the fake 'DOWNLOAD EXTENSION' ad banners | Users who demand near-lossless visual quality (43.94 dB PSNR) or need to shrink an image to an exact KB ceiling for government/exam portals |
| Result & output evidence | ||
| Delivery capabilities | ||
| Recorded export specifications | 2048 × 2048 · PNG · No watermark in test | 2048 × 2048 · PNG · No watermark in test |
| Historical specification note · not an official maximum | 2048×2048 (no-login native-resolution watermark-free PNG direct export) | 2048×2048 full-resolution PNG free direct export (supports exact target KB/MB compression) |
| Watermark observation | Watermark-free | Watermark-free |
| Batch & API | Supports multi-image batch compression in browser; no developer API | Single-image precision workflow (no multi-file batch zip) |
| Recorded free-tier dimensions | 2048 × 2048 | 2048 × 2048 |
| Attached file dimensions | 2048 × 2048 · PNG | 2048 × 2048 · PNG |
| Speed & reliability | ||
| Timing observation | Recorded local processing time: 11.88s · End-to-end reference: 11.88s | Network-observed server wait: 5.4s · End-to-end reference: 7.6s |
| 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 (no account system on the site) | No registration or login required (no account system) |
| Manual adjustment | Not verified | Not verified |
| Interaction observations | While there are no sign-up walls, the workspace is flanked top and bottom by deceptive green 'DOWNLOAD EXTENSION / Click "Download" -> Add Trusted Spot Extension' ad banners, and a full-screen Google AdSense overlay (#aswift_3) intercepted the initial COMPRESS click (01_landing.png, 02_workspace.png). | Both the editor and download screen display a deceptive green 'DOWNLOAD EXTENSION — 2 Easy Steps: 1. Click Download 2. Add Trusted Spot Extension' ad banner on the left sidebar (02_workspace.png, 03_download.png), whereas the real green 'Go to Download / Download Image' button sits in the bottom-right corner. |
| Background & reputation | ||
| Service lifecycle notice | Not verified | Not verified |
| Operator | Optimizilla / ImageCompressor.com | ResizePixel |
| Recorded origin | Independent European Web Utility (Launched 2014) | Ukraine |
| Domain history record | 2014–Present (12-year image compression benchmark) | 2019–Present (dedicated lightweight online image editor) |
| Background & reputation assessment | Operating since 2014 under the Optimizilla brand, ranking among the highest-traffic search destinations for online image compression. | Operated by an independent Ukrainian web utility team focused on lightweight browser image tools. |
| External reputation record | Not verified | Not verified |
| Engineering & privacy | ||
| Processing location | On-device processing | Uploaded for cloud processing |
| Third-party tracking record | Not verified | Not verified |
| Engineering & privacy assessment | Modernized architecture runs 100% local in-browser WebAssembly palette quantization ('All processing happens in your browser'), so user photos are never uploaded to a remote server. | Download page explicitly states 'The download will be valid for 30 minutes' and provides a red '❌ Delete Now' button for immediate manual server deletion (03_download.png). |
| Retention statement | This flow runs locally; post-close deletion not independently verified | Claims deletion within 30 minutes; deletion not independently verified |
| Evaluation basis | ||
| Pricing transparency | 32 / 35 100% free across the entire site with zero paywalls or subscription prompts; uploading the 4.14 MB (2048×2048) anchor image and clicking COMPRESS immediately unlocks the SAVE ALL export button without login (01_landing.png, 02_workspace.png, 03_download.png). | 32 / 35 100% free with zero paywalls or login gates, offering both 'Auto (keep the quality)' and 'Compress file to X KB/MB' modes (01_landing.png, 02_workspace.png). |
| Interaction restraint | 20 / 30 While there are no sign-up walls, the workspace is flanked top and bottom by deceptive green 'DOWNLOAD EXTENSION / Click "Download" -> Add Trusted Spot Extension' ad banners, and a full-screen Google AdSense overlay (#aswift_3) intercepted the initial COMPRESS click (01_landing.png, 02_workspace.png). | 17 / 30 Both the editor and download screen display a deceptive green 'DOWNLOAD EXTENSION — 2 Easy Steps: 1. Click Download 2. Add Trusted Spot Extension' ad banner on the left sidebar (02_workspace.png, 03_download.png), whereas the real green 'Go to Download / Download Image' button sits in the bottom-right corner. |
| Background & reputation | 18 / 20 Operating since 2014 under the Optimizilla brand, ranking among the highest-traffic search destinations for online image compression. | 16 / 20 Operated by an independent Ukrainian web utility team focused on lightweight browser image tools. |
| Engineering & privacy | 14.5 / 15 Modernized architecture runs 100% local in-browser WebAssembly palette quantization ('All processing happens in your browser'), so user photos are never uploaded to a remote server. | 13 / 15 Download page explicitly states 'The download will be valid for 30 minutes' and provides a red '❌ Delete Now' button for immediate manual server deletion (03_download.png). |
| Task quality | 59.5 / 65 Default 224-color PNG palette quantization shrinks the 4,137.9 KB anchor down to 1,752.7 KB (-57.64%, 2.36× ratio) at PSNR = 38.98 dB and SSIM = 0.9983, with an interactive 2–256 Colors slider and live Before/After canvas preview (59.5/65) | 57.2 / 65 Cuts PNG file size nearly in half (-49.63%, 1.99×) while preserving an extraordinary 43.94 dB PSNR and 0.9994 SSIM (57.2/65) |
| Deliverable specifications | 20 / 20 Preserves 100% of the 2048×2048 pixel dimensions and native PNG format without watermarks or login requirements (20.0/20) | 19 / 20 Preserves full 2048×2048 resolution and native PNG format while supporting exact target-KB compression (19.0/20) |
| Processing speed | 10.5 / 15 Local browser 224-color palette quantization on the 2048×2048 PNG takes ~11.88s and requires clicking COMPRESS followed by SAVE ALL (10.5/15) | |
