CompressNow · Image compression
Free login-free on-device processing discloses format conversion upfront; size reduction is substantial, but PNG export is unavailable and transparency needs care.
US-West (California, AS2914)
PNG · Output attached · Open native file ↗
Subsequent pricing and service checks are shown separately without altering historical scores.
One run does not establish all complex scenes, untested paid maxima or long-term uptime.
Plans & historical pricing
Compressnow online in-browser image compressor · 2026-10-21
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 record
Completely free web tool with no accounts or subscription charges.
Compressnow official tool page and FAQ ↗ · 2026-10-21 Capture 1 ↗
Pricing recorded on the test date · 2026-10-18
100% Free ($0, no paid tier)
100% free client-side web tool
Historical context only; not current purchase guidance.
Delivery & access
- Free delivery record
- 2048 × 2048 full-resolution JPG/WebP (579.8 KB)
- Watermark
- Watermark-free
- Free allowance
- 100% free, up to 30 MB per image and up to 30 images per batch
- Account requirements
- No registration or login required (100% local tool)
- Maximum specification record
- 2048×2048 full-resolution free export (outputs as JPG or WebP; does not export native PNG)
May include advertised capabilities; this does not establish a tested paid tier.
- Batch & API
- Supports up to 30 images (≤30 MB each) with one-click DOWNLOAD ZIP
- Manual refinement
- Not recorded or not verified
Tested result & sample
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.
- Fixture
- anchor_compress_v1
- Recorded environment
- US-West (California, AS2914)
- Local processing record
- 0.9 s
- End-to-end reference
- 0.9 s
Network wait includes round trips, queuing and polling error, not pure inference time. Local timings depend on the device; repetition counts are not standardized in legacy records.
Experience, rules & trust
- Disclosure
- Discloses upfront at the top of the page that output format is JPG or WebP ('Transparent areas turn white')
- Interaction
- 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).
- Entity record
- CompressNow
- Origin
- France / European Independent Developer
- Domain history record
- 2012–Present (14-year online image compression tool)
- Third-party tracking record
- Not recorded or not verified
- External information
- Not recorded or not verified
- Processing
- 100% local in-browser Canvas re-encoding and Blob export (zero server upload)
- Retention statement
- Images never leave the user's local device memory
A recorded statement does not verify deletion or all data-processing behavior.
Verifiable audit trail & evidence
Four SHA-256-verified stages link the benchmark fixture, same-run interface screenshots, native exported artifact and archived pricing sources.
anchor_compress_v1 · Inspect fixture & file inspector →
Captures entry rules, result view and export disclosure.
Screenshots, native output and official claims support different conclusions. Evidence grades are not product safety certifications.
Evaluation basis & full scores · Overall 82.9/100
Overall = honesty & reputation × 30% + capability × 70%. Component maxima follow this report’s rubric. List scores are rounded for display; original precision is retained here.
Scoring version 2.3.1 · Test fixture anchor_compress_v1
Honesty & reputation · 87/100 · 30%
| Criterion | Score | Rationale | Basis |
|---|---|---|---|
| Pricing transparency | 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). | Evidence A → |
| Interaction restraint | 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). | Evidence A → |
| Background & reputation | 17 / 20 | Classic multi-language online image weight reducer operating for over 10 years (currently V6.0). | Evidence A → |
| Engineering & privacy | 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.' | Evidence A → |
Capability · 81.2/100 · 70%
| Criterion | Score | Rationale | Basis |
|---|---|---|---|
| Task quality | 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) | Evidence A → |
| Deliverable specifications | 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) | Evidence A → |
| Processing speed | 14 / 15 | 100% local browser Canvas compression with 0 bytes uploaded in ~0.9s (14.0/15) | Evidence A → |
Legacy scores may include advertised maximum capabilities. Read tested output separately from paid capabilities. Records without matching tiers and scope are not ranked together.
Revisions & corrections
- 2026-10-18
Initial real-machine benchmark and PSNR/SSIM/ratio verification on Mode A compression anchor (anchor_compress_v1).