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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 | TinyPNG | DupliChecker | Switch / compare |
|---|---|---|---|
| Image compression | 93/100 2048 × 2048 · PNG | 90/100 2048 × 2048 · PNG | Active task |
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Browse this task →| Criterion | TinyPNG Image compression 93/100 Seven-aspect task score Clear free allowances and login-free batch downloads balance PNG size and quality; the tested limits were 20 images at 5MB each, processed in the cloud. Tested export 2048 × 2048 · PNG Historical test · 2026-10-18 | 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 | TinyPNG online optimizer plans (Web Free / Web Pro / Web Ultra); USD · 2026-10-21 Plan · source date Monthly / one-time Annual bill / period Quota & limits Web Free2026-10-21 ↗ Free Free Free Free without login; up to 20 images per session (max 5 MB each) for AVIF/WebP/PNG/JPEG compression and 3 format conversions per session. Web Pro (Annual)2026-10-21 ↗ — Annual price not verified Annual Unlimited image compressions, up to 75 MB file size, folder upload, and ad-free; card displays USD 3.25/month equivalent ("Per month | Billed annually"). Pricing card displays only the USD 3.25/month equivalent ("Billed annually") without printing the annual invoice total on the public page. Web Ultra (Annual)2026-10-21 ↗ — Annual price not verified Annual Unlimited compressions and format conversions, up to 150 MB file size, fastest speed, and ad-free; card displays USD 12.42/month equivalent ("Per month | Billed annually"). Pricing card displays only the USD 12.42/month equivalent ("Billed annually") without printing the annual invoice total on the public page. 3 plan / billing-period records, all listed; — means that period is not recorded. The official /pricing/web page lists Web Free (USD 0, 20 images/session, max 5 MB/file, 3 format conversions/session), Web Pro (displayed as USD 3.25/month billed annually, unlimited compressions, max 75 MB/file), and Web Ultra (displayed as USD 12.42/month billed annually, unlimited compressions and conversions, max 150 MB/file). Because the Web Pro and Web Ultra cards display only rounded monthly equivalents ("Per month | Billed annually") without printing the annual invoice totals on the card, the annual totals are marked unverified. Verification has gaps; unknown prices and quotas are not inferred. Cancellation, sources & verification recordCredit card subscriptions auto-renew annually (with email reminders 1 month and 1 week prior) and can be disabled anytime in the account dashboard; upgrading from Web Pro to Web Ultra refunds remaining Web Pro months. TinyPNG official website and Web subscription pricing page ↗ · 2026-10-21 Capture 1 ↗ · Capture 2 ↗ | 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 | Up to 20 images per day, max 5 MB per file on the free web tier | Free guests can upload up to 10 images per batch, max 5 MB per image |
| Cancellation & refunds | Credit card subscriptions auto-renew annually (with email reminders 1 month and 1 week prior) and can be disabled anytime in the account dashboard; upgrading from Web Pro to Web Ultra refunds remaining Web Pro months. | The Image Compressor tool is free to use and involves no subscription charges. |
| Disclosure of costs & limits | 5 MB and 20-image limits are printed directly inside the upload dropzone before file selection | 'Upload Up to 10 images, max 5MB each' is printed directly inside the upload box |
| Task quality | ||
| Measured fixture results | File reduction: 57.73% · Output size: 1749 KB | File reduction: 53.34% · Output size: 1930.7 KB |
| Fixture findings | Kept PNG format while reducing this fixture by about 58%; check free file-size and quantity limits. | Reduced this fixture by about 53% without login or a watermark; the page contains many surrounding links. |
| Original historical observation | TinyPNG remains the gold standard for smart PNG quantization: without changing format or pixel dimensions (2048×2048), it cuts our 4.24 MB anchor PNG by 57.73% (1,749.0 KB) while achieving the highest fidelity in the category at PSNR=40.09 dB and SSIM=0.9987 (02_workspace.png, 03_download.png). | 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 | Frontend developers, UI designers, and content editors who need to keep native PNG format (and alpha support) while cutting file weight by ~60% with virtually zero visual loss (PSNR > 40 dB) | 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 (native resolution preserved, watermark-free PNG) | 2048×2048 (native resolution watermark-free PNG direct export) |
| Watermark observation | Watermark-free | Watermark-free |
| Batch & API | Supports 20-file batch drag-and-drop, Photoshop plugin, and official Tinify REST API | 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: 4.2s · End-to-end reference: 6.3s | Network-observed server wait: 5.4s · End-to-end reference: 7.6s |
| Date & fixture | 2026-10-18 · anchor_compress_v1 · US-West (California, AS2914) | 2026-10-19 · 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 | No login required for free tier | No login required |
| Manual adjustment | Not verified | Not verified |
| Interaction observations | No forced sign-up modal, no countdown gates, and no watermark traps; clicking Download immediately exports the compressed PNG. | 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 | Tinify B.V. / Voormedia B.V. | DupliChecker (duplichecker.com) |
| Recorded origin | Amsterdam, Netherlands | Multi-Tool Web Portal |
| Domain history record | 2012–Present (14-year PNG optimization benchmark) | 2006–Present (20-year utility portal) |
| Background & reputation assessment | Developed and operated by Voormedia B.V. in Amsterdam, Netherlands since 2012—the global benchmark for smart PNG quantization. | Long-standing SEO and text/image utility portal (duplichecker.com) operating since 2006. |
| 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 | HTTPS encrypted upload to api.tinify.com; temporary compressed files are automatically purged after a short window. | Delivers compressed outputs via temporary AWS S3 buckets (temp-ca.s3.amazonaws.com) and states that temporary files are automatically purged. |
| Retention statement | Explicit retention period unconfirmed; inspect policy record | Explicit retention period unconfirmed; inspect policy record |
| Evaluation basis | ||
| Pricing transparency | 33 / 35 Clearly states free tier limits on the upload dropzone ('Up to 20 images, max 5 MB each'). Uploading the 4.24 MB (2048×2048) anchor PNG requires no login and immediately provides a free download button (01_landing.png, 02_workspace.png, 03_download.png). | 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 | 27.5 / 30 No forced sign-up modal, no countdown gates, and no watermark traps; clicking Download immediately exports the compressed PNG. | 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 | 19.5 / 20 Developed and operated by Voormedia B.V. in Amsterdam, Netherlands since 2012—the global benchmark for smart PNG quantization. | 16.5 / 20 Long-standing SEO and text/image utility portal (duplichecker.com) operating since 2006. |
| Engineering & privacy | 13 / 15 HTTPS encrypted upload to api.tinify.com; temporary compressed files are automatically purged after a short window. | 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 | 61.1 / 65 Preserves native PNG format and 2048×2048 dimensions while shrinking 4,137.9 KB to 1,749.0 KB (-57.73%, 2.37× ratio) with industry-leading PSNR = 40.09 dB and SSIM = 0.9987 (59.9/65) | 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 Exports a watermark-free 2048×2048 PNG without login (capped at 5 MB per file and 20 files/day on the free tier) (19.0/20) | 20 / 20 100% preserves 2048×2048 pixel dimensions and native PNG format without watermarks or login (20.0/20) |
| Processing speed | 12.5 / 15 Server-side smart quantization on api.tinify.com completes in ~4.2s (13.0/15) | 11.8 / 15 Cloud upload and AWS S3 compressed delivery complete in ~7.6s (~5.4s server processing) (11.8/15) |
