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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 | Kraken.io | Switch / compare |
|---|---|---|---|
| Image compression | 86/100 2048 × 2048 · PNG | 47/100 Blocked for files >1 MB ('File size too large. Upgrade to PRO and get 32MB max file size.') · Historical description; output not 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 | Kraken.io Web Interface Image compression 47/100 Seven-aspect task score The interface avoids ad interruptions, but free files are capped at 1MB and many features need Pro; this fixture was rejected, so compression quality was not tested. Tested export Blocked for files >1 MB ('File size too large. Upgrade to PRO and get 32MB max file size.') · Historical description; output not attached Historical test · 2026-10-18 |
|---|---|---|
| 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 ↗ | Kraken.io API and Web Interface PRO plans (Free / Micro / Basic / Advanced / Premium / Enterprise); USD · 2026-10-21 Plan · source date Monthly / one-time Annual bill / period Quota & limits Free Account2026-10-21 ↗ Free Free Free 100 MB free testing quota without credit card; Free Web Interface restricts single files to ≤1 MB. Micro Monthly2026-10-21 ↗ USD 5/month — Monthly 500 MB of images/month (USD 5 per additional GB); includes Web Interface PRO (up to 32 MB/file) and full API access. Micro Yearly2026-10-21 ↗ — USD 50/year Annual USD 50/year (2 months free); 500 MB of images/month (USD 5 per additional GB), including Web Interface PRO and API. Basic Monthly2026-10-21 ↗ USD 9/month — Monthly 2 GB of images/month (USD 4 per additional GB); includes Web Interface PRO and full API access. Basic Yearly2026-10-21 ↗ — USD 90/year Annual USD 90/year (2 months free); 2 GB of images/month (USD 4 per additional GB). Advanced Monthly2026-10-21 ↗ USD 19/month — Monthly 5 GB of images/month (USD 3 per additional GB); includes Web Interface PRO and full API access. Advanced Yearly2026-10-21 ↗ — USD 190/year Annual USD 190/year (2 months free); 5 GB of images/month (USD 3 per additional GB). Premium Monthly2026-10-21 ↗ USD 39/month — Monthly 15 GB of images/month (USD 2 per additional GB); includes Web Interface PRO and full API access. Premium Yearly2026-10-21 ↗ — USD 390/year Annual USD 390/year (2 months free); 15 GB of images/month (USD 2 per additional GB). Enterprise Monthly2026-10-21 ↗ USD 79/month — Monthly 60 GB of images/month (USD 1 per additional GB); includes Web Interface PRO and full API access. Enterprise Yearly2026-10-21 ↗ — USD 790/year Annual USD 790/year (2 months free); 60 GB of images/month (USD 1 per additional GB). 11 plan / billing-period records, all listed; — means that period is not recorded. The official pricing page lists the Free Account (100 MB testing quota; Free Web Interface capped at 1 MB/file) and five monthly/yearly tiers (yearly includes 2 months free at USD 50 / 90 / 190 / 390 / 790 per year). All paid plans include Web Interface PRO (up to 32 MB/file), API access, WordPress plugin, and Magento extension. Cancellation, sources & verification recordNo long-term contract; upgrade, downgrade, or cancel anytime under Account Settings. VAT applies to non-business EU customers. Kraken.io official monthly/yearly pricing and FAQ ↗ · 2026-10-21 Capture 1 ↗ · Capture 2 ↗ |
| 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 | Free Web Interface strictly capped at ≤1 MB per file; paid PRO unlocks 32 MB per file |
| 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). | No long-term contract; upgrade, downgrade, or cancel anytime under Account Settings. VAT applies to non-business EU customers. |
| Disclosure of costs & limits | Discloses 'Max 10 MB' directly above the Select files button | Small gray footer note below dropzone ('Free Web Interface has a file size limit of 1MB') + inline error row on upload |
| Task quality | ||
| Measured fixture results | File reduction: 47.38% · Output size: 2177.3 KB | File reduction: 0% · Output size: 4137.9 KB |
| Fixture findings | Reduced this fixture by about 47% with gradients retained; the recorded free file limit was 10MB. | The roughly 4MB fixture exceeded the recorded 1MB free limit; free compression could not complete. |
| 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. | Kraken.io's free Web Interface remains stuck in a decade-old '1 MB max file size' quota (01_landing.png): when fed our 4,137.9 KB (2048×2048) benchmark PNG, the queue immediately rejects it with 'File size too large. Upgrade to PRO and get 32MB max file size.' (02_workspace.png, 03_download.png). |
| 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 | Only usable for tiny web icons/thumbnails already under 1 MB, or enterprise developers with a paid Kraken.io PRO API subscription |
| Result & output evidence | No native output obtained; the preview does not establish final export quality. | |
| Delivery capabilities | ||
| Recorded export specifications | 2048 × 2048 · PNG · No watermark in test | Blocked for files >1 MB ('File size too large. Upgrade to PRO and get 32MB max file size.') · Historical description; output not attached · Check watermark record No native output is attached; check the evidence for specification and watermark claims. |
| Historical specification note · not an official maximum | 2048×2048 full-resolution PNG free direct export (up to 10 MB per file) | Free tier capped strictly at 1 MB per file (rejects our 4.24 MB benchmark PNG; requires PRO for 32 MB) |
| Watermark observation | Watermark-free | Watermark-free (only for tiny ≤1 MB files) |
| Batch & API | Supports multi-file drag-and-drop and one-click Download All | Supports multi-file and ZIP upload (all subject to the 1 MB/file free cap); full REST API on PRO |
| Recorded free-tier dimensions | 2048 × 2048 | Not verified |
| Attached file dimensions | 2048 × 2048 · PNG | Not verified |
| Speed & reliability | ||
| Timing observation | Network-observed server wait: 8.4s · End-to-end reference: 10.5s | Network-observed server wait: 0.2s · End-to-end reference: 0.2s |
| 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 | Account required in this test |
| Sign-in methods | No login required (email login for Pro subscribers) | No login required for ≤1 MB; lifting the 1 MB cap requires a paid Kraken.io PRO subscription |
| 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). | No fake download ads, but steps 1, 3, and 4 (URL Paster, Image Resizing, Image Conversion) are locked behind 'available in Kraken.io PRO' and any file over 1 MB fails with a PRO upgrade prompt (03_download.png). |
| Background & reputation | ||
| Service lifecycle notice | Not verified | Not verified |
| Operator | Compressor.io | Nekkra UG (Kraken.io) |
| Recorded origin | France / European Independent Tool Team | Germany |
| Domain history record | 2013–Present (13-year established image optimizer) | 2013–Present (13-year image optimization service) |
| Background & reputation assessment | Well-known online image optimization service operating since 2013 with strong adoption among web designers and developers. | Operated by Germany-based Nekkra UG (founded in 2013), well-known in legacy WordPress/Magento optimization workflows. |
| External reputation record | Not verified | Not verified |
| Engineering & privacy | ||
| Processing location | Uploaded for cloud processing | Uploaded for cloud 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. | Clearly states that optimized files remain available for 12 hours before automatic deletion. |
| Retention statement | Explicit retention period unconfirmed; inspect policy record | Claims deletion within 12 hours; 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. | 21 / 35 Discloses 'Free Web Interface has a file size limit of 1MB' in small gray footer text below the dropzone (01_landing.png); however, capping a 'Free Online Image Optimizer and Compressor' at 1 MB blocks almost every real-world high-res PNG/JPG that actually needs compression, immediately prompting 'File size too large. Upgrade to PRO and get 32MB max file size.' (02_workspace.png, 03_download.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). | 21 / 30 No fake download ads, but steps 1, 3, and 4 (URL Paster, Image Resizing, Image Conversion) are locked behind 'available in Kraken.io PRO' and any file over 1 MB fails with a PRO upgrade prompt (03_download.png). |
| Background & reputation | 18 / 20 Well-known online image optimization service operating since 2013 with strong adoption among web designers and developers. | 16 / 20 Operated by Germany-based Nekkra UG (founded in 2013), well-known in legacy WordPress/Magento optimization workflows. |
| Engineering & privacy | 14 / 15 Supports anonymous no-login compression; temporary download links are cleaned up automatically after the session. | 10 / 15 Clearly states that optimized files remain available for 12 hours before automatic deletion. |
| 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) | 20 / 65 Rejects our 4,137.9 KB (4.24 MB) standard 2048×2048 PNG benchmark anchor due to its strict 1 MB free file size cap (20.0/65) |
| Deliverable specifications | 18.5 / 20 Preserves full 2048×2048 resolution and native PNG format with one-click no-login download (18.5/20) | 7.7 / 20 Free tier is restricted to files ≤1 MB, preventing free export of standard high-resolution PNG/JPG images (7.7/20) |
| Processing speed | 11.5 / 15 Total cloud upload and optimization time ~10.5s (~8.4s pure server processing) (11.5/15) | 10 / 15 Client-side size check rejects >1 MB files in 0.2s with a PRO upgrade notice (10.0/15) |
