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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 | DupliChecker | CompressNow | Switch / compare |
|---|---|---|---|
| Image compression | 90/100 2048 × 2048 · PNG | 83/100 PNG · Output attached | Active task |
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Browse this task →| Criterion | DupliChecker Image Compressor Image compression 90/100 Seven-aspect task score Upfront free limits and login-free batch downloads accompany roughly halved PNG size; each image is capped at 5MB amid many ads and tool links. Tested export 2048 × 2048 · PNG Historical test · 2026-10-19 | 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 |
|---|---|---|
| Pricing & rules | ||
| Pricing plans | DupliChecker online Image Compressor tool (excludes separate Plagiarism, Paraphrasing, and Reverse Image Search plans) · 2026-10-21 Plan · source date Monthly / one-time Annual bill / period Quota & limits Image Compressor Free2026-10-21 ↗ Free Free Free Free without login; up to 10 images per batch, max 5 MB each (JPG/JPEG/PNG). 1 plan / billing-period records, all listed; — means that period is not recorded. The Image Compressor page explicitly states "100% Free" and supports up to 10 images per batch at max 5 MB each (JPG/JPEG/PNG) without login. Site-wide Pricing links cover Plagiarism, Paraphrasing, and Reverse Image Search quotas; image compression requires no subscription. Cancellation, sources & verification recordThe Image Compressor tool is free to use and involves no subscription charges. DupliChecker official online Image Compressor 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 guests can upload up to 10 images per batch, max 5 MB per image | 100% free, up to 30 MB per image and up to 30 images per batch |
| Cancellation & refunds | The Image Compressor tool is free to use and involves no subscription charges. | Completely free web tool with no accounts or subscription charges. |
| Disclosure of costs & limits | 'Upload Up to 10 images, max 5MB each' is printed directly inside the upload box | 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: 53.34% · Output size: 1930.7 KB | File reduction: 85.99% · Output size: 579.8 KB |
| Fixture findings | Reduced this fixture by about 53% without login or a watermark; the page contains many surrounding links. | Local compression reduced this fixture by about 86%; export changes to JPG or WebP, not PNG. |
| Original historical observation | While DupliChecker's page has many SEO cross-links, its core compression pipeline is solid: shrinking our 4.14 MB anchor PNG by 53.34% to 1.89 MB at PSNR=39.54 dB and SSIM=0.9985 with no login required (02_workspace.png, 03_download.png). | 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 | Users who want quick no-login compression for PNG/JPEG files under 5 MB with manual quality slider control | 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 (native resolution watermark-free PNG direct export) | 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 10-image batch upload 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: 5.4s · End-to-end reference: 7.6s | Recorded local processing time: 0.9s · End-to-end reference: 0.9s |
| Date & fixture | 2026-10-19 · 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 registration or login required (100% local tool) |
| Manual adjustment | Not verified | Not verified |
| Interaction observations | Supports no-login single or Download All batch export, though the surrounding page layout is cluttered with internal SEO tool links and ad slots. | 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 | DupliChecker (duplichecker.com) | CompressNow |
| Recorded origin | Multi-Tool Web Portal | France / European Independent Developer |
| Domain history record | 2006–Present (20-year utility portal) | 2012–Present (14-year online image compression tool) |
| Background & reputation assessment | Long-standing SEO and text/image utility portal (duplichecker.com) operating since 2006. | 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 | Delivers compressed outputs via temporary AWS S3 buckets (temp-ca.s3.amazonaws.com) and states that temporary files are automatically purged. | 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 free tier limits inside the dropzone ('Upload Up to 10 images, max 5MB each.', 01_landing.png); uploading our 4.14 MB anchor PNG and clicking Compress Image immediately reveals a free 'Save -53% (1.89 MB)' download button with zero paywalls (02_workspace.png, 03_download.png). | 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 | 24.5 / 30 Supports no-login single or Download All batch export, though the surrounding page layout is cluttered with internal SEO tool links and ad slots. | 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 | 16.5 / 20 Long-standing SEO and text/image utility portal (duplichecker.com) operating since 2006. | 17 / 20 Classic multi-language online image weight reducer operating for over 10 years (currently V6.0). |
| Engineering & privacy | 12.5 / 15 Delivers compressed outputs via temporary AWS S3 buckets (temp-ca.s3.amazonaws.com) and states that temporary files are automatically purged. | 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 | 60.2 / 65 Preserves native 2048×2048 PNG format while reducing 4,137.9 KB to 1,930.7 KB (53.34% reduction, 2.14× ratio) with PSNR = 39.54 dB and SSIM = 0.9985 (60.2/65) | 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 | 20 / 20 100% preserves 2048×2048 pixel dimensions and native PNG format without watermarks or login (20.0/20) | 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 | 11.8 / 15 Cloud upload and AWS S3 compressed delivery complete in ~7.6s (~5.4s server processing) (11.8/15) | 14 / 15 100% local browser Canvas compression with 0 bytes uploaded in ~0.9s (14.0/15) |
