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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 | online-convert.com | DupliChecker | Switch / compare |
|---|---|---|---|
| Image compression | 90/100 2048 × 2048 · PNG | 90/100 2048 × 2048 · PNG | Active task |
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Browse this task →| Criterion | Online-Convert Compress PNG Image compression 90/100 Seven-aspect task score Veteran German file conversion platform offering guest PNG compression (2048×2048) with 55.99% size reduction, 39.27 dB PSNR, 0.9984 SSIM, and intact alpha channel in 7.5s server wait. Tested export 2048 × 2048 · PNG Historical test · 2026-11-02 | 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 |
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| Pricing & rules | ||
| Pricing plans | Online-Convert free trial credits, Pay As You Go packages and subscriptions · 2026-10-31 Plan · source date Monthly / one-time Annual bill / period Quota & limits Free Trial2026-10-31 ↗ Free Free Free 16 free trial credits upon signup without payment details Supports evaluation of most conversion and compression tools；Shared standard queue with file size limits；No automatic renewal；Valid until credits exhausted Pay As You Go (240 Credits)2026-10-31 ↗ USD 8 · one-time payment Usage / one-time Usage / one-time 240 credits ($0.0333/credit), valid for 1 year Access to all tools, no waiting queue, priority processing Rules [1] [2] [3]Pay As You Go (480 Credits)2026-10-31 ↗ USD 14 · one-time payment Usage / one-time Usage / one-time 480 credits ($0.0292/credit), valid for 1 year Full tools access, zero wait queue, ad-free experience Rules [1] [2] [3]Monthly Subscription (2800 Credits)2026-10-31 ↗ USD 29/month — Monthly 2800 credits per month (up to 2800 standard tasks or 350 AI tasks) All features, no waiting queue, batch concurrent processing, no ads；Unused monthly credits do not roll over；Renews monthly, cancel anytime in dashboard；Valid during active billing period Annual Subscription (2800 Credits/mo)2026-10-31 ↗ — Annual price not verified Annual 2800 credits per month; UI states $23.17 USD/month equivalent without full annual total All features, no waiting queue, batch concurrent processing, no ads；Annual billing total not stated upfront; held as null with partial coverage；Renews annually；Valid during annual period 5 plan / billing-period records, all listed; — means that period is not recorded. Anonymous conversions for basic files; 16 free trial credits upon registration; Pay As You Go packs: 240 credits for $8, 480 for $14; monthly subscription $29/mo for 2800 credits; annual plans state monthly equivalents without full upfront invoice total. Verification has gaps; unknown prices and quotas are not inferred. Cancellation, sources & verification recordCancellation and refund terms unverified Online-Convert Plans & Pricing ↗ · 2026-10-31 Capture 1 ↗ | 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 ↗ |
| Free & trial allowance on the test date | Guest users can compress everyday files directly; 16 trial credits granted upon registration | Free guests can upload up to 10 images per batch, max 5 MB per image |
| Cancellation & refunds | Not verified | The Image Compressor tool is free to use and involves no subscription charges. |
| Disclosure of costs & limits | Transparent upfront free tier disclosure and clear credit packs with zero post-conversion paywall traps | 'Upload Up to 10 images, max 5MB each' is printed directly inside the upload box |
| Task quality | ||
| Measured fixture results | File reduction: 55.99% · Output size: 1821 KB | File reduction: 53.34% · Output size: 1930.7 KB |
| Fixture findings | Guest export of native 2048×2048 PNG (1.8 MB · -55.99%) with high visual fidelity (39.27 dB PSNR, 0.9984 SSIM) and intact alpha channel in 7.5s server wait. | Reduced this fixture by about 53% without login or a watermark; the page contains many surrounding links. |
| Original historical observation | Online-Convert cloud backend compressed the 4,137.9 KB anchor image to 1,821.0 KB (55.99% reduction) in 7.5s server wait, achieving 39.27 dB PSNR and 0.9984 SSIM while maintaining sharp text edges and clean transparency. | 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). |
| Suitable uses · historical assessment | Users seeking a trusted guest-usable tool to shrink PNG files by over 50% with high fidelity (PSNR 39.27 dB, SSIM 0.9984) and cloud batch workflows | Users who want quick no-login compression for PNG/JPEG files under 5 MB with manual quality slider control |
| 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 (original size watermark-free PNG) | 2048×2048 (native resolution watermark-free PNG direct export) |
| Watermark observation | Watermark-free | Watermark-free |
| Batch & API | Supports batch queuing and advanced conversion parameter tuning | Supports 10-image batch upload and one-click Download All |
| Recorded free-tier dimensions | 2048 × 2048 | 2048 × 2048 |
| Attached file dimensions | 2048 × 2048 · PNG | 2048 × 2048 · PNG |
| Speed & reliability | ||
| Timing observation | Network-observed server wait: 7.5s | Network-observed server wait: 5.4s · End-to-end reference: 7.6s |
| Date & fixture | 2026-11-02 · anchor_compress_v1 · US-West (California, AS2914) | 2026-10-19 · 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 | Basic compression usable without login; email/password, Google, and Apple login supported for advanced tiers | No login required |
| Manual adjustment | Not verified | Not verified |
| Interaction observations | Not verified | Supports no-login single or Download All batch export, though the surrounding page layout is cluttered with internal SEO tool links and ad slots. |
| Background & reputation | ||
| Service lifecycle notice | Not verified | Not verified |
| Operator | QaamGo Media GmbH | DupliChecker (duplichecker.com) |
| Recorded origin | Cologne, Germany | Multi-Tool Web Portal |
| Domain history record | Domain registered in 2009 (operating for over 15 years) | 2006–Present (20-year utility portal) |
| Background & reputation assessment | Not verified | Long-standing SEO and text/image utility portal (duplichecker.com) operating since 2006. |
| External reputation record | Established German file conversion suite with transparent EU corporate and GDPR disclosures. | Not verified |
| Engineering & privacy | ||
| Processing location | Uploaded for cloud processing | Uploaded for cloud processing |
| Third-party tracking record | Google Analytics · Google AdSense | Not verified |
| Engineering & privacy assessment | Not verified | Delivers compressed outputs via temporary AWS S3 buckets (temp-ca.s3.amazonaws.com) and states that temporary files are automatically purged. |
| Retention statement | Claims deletion within 24 hours; deletion not independently verified | Explicit retention period unconfirmed; inspect policy record |
| 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). | |
| 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. | |
| Background & reputation | 16.5 / 20 Long-standing SEO and text/image utility portal (duplichecker.com) operating since 2006. | |
| 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. | |
| Task quality | 60 / 65 Size Reduction: -55.99% (4137.9 KB → 1821 KB, 2.27× ratio) · PSNR: 39.27 dB · SSIM: 0.9984 | 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) |
| Deliverable specifications | 20 / 20 Clean unwatermarked export (8/8); Export spec: 2048 × 2048 (original size watermark-free PNG) | 20 / 20 100% preserves 2048×2048 pixel dimensions and native PNG format without watermarks or login (20.0/20) |
| Processing speed | 12 / 15 Network-observed server wait: 7.5s (API mode: async_verified; network upload N/A / end-to-end N/A shown for reference only, never penalized) | 11.8 / 15 Cloud upload and AWS S3 compressed delivery complete in ~7.6s (~5.4s server processing) (11.8/15) |
