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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 | Kraken.io | Switch / compare |
|---|---|---|---|
| Image compression | 88/100 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 | 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 | 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 | 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 ↗ | 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 | Supports multi-file batch drag-and-drop and per-image palette color tuning (2–256 colors) with no daily cap | Free Web Interface strictly capped at ≤1 MB per file; paid PRO unlocks 32 MB per file |
| Cancellation & refunds | Ad-supported free tool with no accounts or subscription charges. | No long-term contract; upgrade, downgrade, or cancel anytime under Account Settings. VAT applies to non-business EU customers. |
| Disclosure of costs & limits | All features and sliders are unlocked upfront with zero hidden paywalls | 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: 57.64% · Output size: 1752.7 KB | File reduction: 0% · Output size: 4137.9 KB |
| Fixture findings | Offers before/after preview and colour adjustment; distinguish nearby ad buttons from the real download. | The roughly 4MB fixture exceeded the recorded 1MB free limit; free compression could not complete. |
| 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). | 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 | 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 | 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 (no-login native-resolution watermark-free PNG direct export) | 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-image batch compression in browser; no developer API | 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 | Recorded local processing time: 11.88s · End-to-end reference: 11.88s | 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 (no account system on the site) | 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 | 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). | 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 | Optimizilla / ImageCompressor.com | Nekkra UG (Kraken.io) |
| Recorded origin | Independent European Web Utility (Launched 2014) | Germany |
| Domain history record | 2014–Present (12-year image compression benchmark) | 2013–Present (13-year image optimization service) |
| Background & reputation assessment | Operating since 2014 under the Optimizilla brand, ranking among the highest-traffic search destinations for online image compression. | 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 | 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. | Clearly states that optimized files remain available for 12 hours before automatic deletion. |
| Retention statement | This flow runs locally; post-close deletion not independently verified | Claims deletion within 12 hours; 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). | 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 | 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). | 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 Operating since 2014 under the Optimizilla brand, ranking among the highest-traffic search destinations for online image compression. | 16 / 20 Operated by Germany-based Nekkra UG (founded in 2013), well-known in legacy WordPress/Magento optimization workflows. |
| 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. | 10 / 15 Clearly states that optimized files remain available for 12 hours before automatic deletion. |
| 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) | 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 | 20 / 20 Preserves 100% of the 2048×2048 pixel dimensions and native PNG format without watermarks or login requirements (20.0/20) | 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 | 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) | 10 / 15 Client-side size check rejects >1 MB files in 0.2s with a PRO upgrade notice (10.0/15) |
