Freedom251 › Image Compression Software
Compress PNG
What Compress PNG is
Compress PNG is a free web tool that reduces PNG file sizes through color quantization followed by additional lossless compression. It analyzes colors, groups similar shades, creates a palette, remaps pixels, and compresses the result. You can select or drag up to 20 PNG images into one batch, adjust each image’s color count from ranges such as 16–32 through 256, and save files individually or all together. Transparency and alpha-channel information are preserved. Processing runs locally in the browser with WebAssembly, so files are not uploaded; the operator says processed files are not collected, stored, or accessed. The service supports PNG only and offers both compression modes. Lowering the color count can produce visible banding in smooth gradients, so previews should be checked before saving. Its terms permit personal and commercial use but provide no guarantees. Google data collection and cookies are used for advertising personalization, measurement, and site statistics.
Who it suits
Compress PNG suits anyone needing browser-based PNG reduction without uploading files. It is useful for batch work and users who want direct color-count control.
What it does well
- Processes up to 20 PNGs per batch
- Runs locally with WebAssembly
- Preserves transparency and alpha channels
- Adjustable color-count controls
- Personal and commercial use permitted
What to know first
- PNG format only
- Color reduction can cause gradient banding
- Terms provide no guarantees
- Google cookies support ad personalization
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free online PNG compressor | Up to 20 PNG images at a time · browser-based processing | Free |
As compresspng.com lists them, read 12 Oct 2026. The maker's own page has the final word.
Verdict
Compress PNG offers local, batch PNG compression with adjustable color reduction and no stated file uploads. Review previews carefully when gradients matter, and note the service’s cookie and no-guarantee terms.
Facts from Compress PNG's own pages
- Batch limit
- You can select or drag in up to 20 PNG images at a time. · compresspng.com, 11 Oct 2026
- Batch processing
- Users can select or drag in up to 20 PNG images at a time. · compresspng.com, 12 Oct 2026
- Color controls
- You can adjust the color count for an image, with options described from 16–32 colors up to 256 colors. · compresspng.com, 11 Oct 2026
- Compression method
- The tool analyzes image colors, groups similar colors, creates a palette, remaps pixels, and applies further lossless compression. · compresspng.com, 12 Oct 2026
- Compression modes
- both · compresspng.com, 20 Sept 2026
- Cookies and ads
- The privacy terms say Google collects data and uses cookies for ad personalization and measurement, and that the site uses cookies for statistical purposes. · compresspng.com, 11 Oct 2026
- Cookies and analytics
- The terms say Google collects data and uses cookies for ad personalization and measurement, and that the site uses cookies for statistical purposes. · compresspng.com, 12 Oct 2026
- File privacy
- The site says files stay on the user's device and that it does not collect, store, or access processed files. · compresspng.com, 11 Oct 2026
- Free plan
- Yes · compresspng.com, 20 Sept 2026
- Guarantees
- The terms state that the service provides no guarantees. · compresspng.com, 12 Oct 2026
- Image quality limit
- The site warns that reducing colors can cause visible banding in smooth gradients and recommends checking the preview. · compresspng.com, 12 Oct 2026
- Local processing
- Files are processed locally in the browser using WebAssembly and are not uploaded to a server. · compresspng.com, 12 Oct 2026
- Manual controls
- Users can adjust the color count for an image by clicking its thumbnail. · compresspng.com, 12 Oct 2026
- Permitted use
- The terms allow use of the service for personal or commercial purposes. · compresspng.com, 12 Oct 2026
- Privacy
- The terms say the operator does not collect, store, or access files processed with the service. · compresspng.com, 12 Oct 2026
- Processing
- Image processing runs in the browser using WebAssembly, with no server-side processing. · compresspng.com, 11 Oct 2026
- Purpose
- Compress PNG reduces the file size of PNG images using color quantization and additional lossless compression. · compresspng.com, 12 Oct 2026
- Quality caveat
- The site says color reduction can cause visible banding in smooth gradients and recommends previewing results before saving. · compresspng.com, 11 Oct 2026
- Save options
- Compressed images can be saved individually or all at once. · compresspng.com, 12 Oct 2026
- Saving
- The tool lets users save compressed images individually or all at once. · compresspng.com, 11 Oct 2026
- Supported formats
- PNG · compresspng.com, 20 Sept 2026
- Transparency
- The site says it preserves PNG alpha channel information during compression. · compresspng.com, 12 Oct 2026
- Usage rights
- The terms say the service may be used for personal or commercial purposes. · compresspng.com, 11 Oct 2026
Where Compress PNG stands on Freedom251
- Image Compression Software#74 of 85