TinyPNG is the most popular online image compression tool, used by millions of developers worldwide. Privatool offers image compression that works entirely in your browser — no file upload, no server. Here's a detailed comparison.
Feature comparison
| Feature | Privatool | TinyPNG |
|---|---|---|
| PNG compression | ✅ Client-side | ✅ Server-side (lossy) |
| JPEG compression | ✅ Client-side | ✅ Server-side |
| WebP support | ✅ | ✅ |
| Files uploaded to server | ❌ Never | ✅ Yes |
| Free file limit | No limit | 20 images / 5MB each |
| API access | ❌ | ✅ (paid) |
| Batch processing | ✅ | ✅ |
| Compression algorithm | Browser Canvas API | Pngquant (lossy) |
How TinyPNG works
TinyPNG uses a server-side lossy PNG compression algorithm called pngquant. It reduces PNG file sizes by 60–80% by reducing the number of colors in the image. The results are excellent — often indistinguishable from the original — but it requires uploading your image to their servers.
How Privatool's image compressor works
Privatool uses the browser's Canvas API and the browser-image-compression JavaScript library to compress images entirely in your browser. No image data is sent to any server. The compression is lossy (quality-based JPEG-style) and typically reduces file sizes by 50–70%.
Privacy implications
If you're compressing personal photos, client documents, medical images, or any image you wouldn't want on a third-party server, TinyPNG requires you to upload those images to servers in the Netherlands. Privatool processes everything locally.
Compression quality comparison
TinyPNG's pngquant algorithm produces excellent results for PNGs specifically. For JPEGs, both tools produce comparable quality. For privacy-sensitive images, Privatool wins by default since compression quality is irrelevant if you can't upload the file at all.
When TinyPNG wins
- You need the absolute best PNG compression quality
- You process many images and want a polished API for automation
- You're compressing non-sensitive images like product photos or stock imagery
When Privatool wins
- Images contain sensitive content (personal photos, medical scans, client documents)
- You're on a restricted network or offline
- You need more than 20 images at once without paying
- You want zero data sharing with third parties