How Compresso Compares
Compresso occupies a unique intersection: free, browser-native, private (zero upload), with HEIC input and a 3.6 KB embeddable library. This table compares the facts.
| compresso.js | compressorjs | browser-image-compression | pica | |
|---|---|---|---|---|
| Bundle (min+gzip) | 3.8 KB | 4.6 KB | 19.6 KB | 15.7 KB |
| Required dependencies | 0 | 2 | 1 | 2 |
| HEIC / HEIF input | Yes | No | No | No |
| AVIF output | Yes | No | No | No |
| Auto best format | Yes | No | No | No |
| Never larger than input | Yes | No | No | No |
| Target max file size | Yes | No | Yes | No |
| Web Worker batching | Yes | No | Yes | Yes |
When not to use Compresso
For server-side batch processing use sharp; for pixel-level editing use Jimp; for highest-quality downscale-only use pica. Compresso optimizes user-selected images in the browser before upload.