Formats and Limits
What imgcompress can open and export, upload size, batch size, and the caps for ICO, fit-to-size and AI upscaling.
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What imgcompress can open and export, upload size, batch size, and the caps for ICO, fit-to-size and AI upscaling.
Quick reference for formats and size limits. The app also lists formats under the upload area (Supported formats).
| Format | Good for |
|---|---|
| JPEG | Photos, small files |
| PNG | Transparency, logos |
| WebP | Small files that work widely; keeps transparency |
| AVIF | Very small files, high quality; keeps transparency |
| ICO | Site / app icons (max 256 px wide) |
| Images as pages (presets, margins, split long images) |
About 71 input types. 49 are covered by automated conversion tests.
| Group | Examples |
|---|---|
| Everyday | JPG, PNG, WebP, GIF, BMP, TIFF, HEIC / HEIF, AVIF |
| Design | PSD, SVG, EPS, PDF |
| Also accepted | ICO, ICNS, JP2 and many more in the in-app list |
Some rare formats are accepted by the decoder but not fully tested yet — try them; the app marks them as unverified.
| Limit | Default | Notes |
|---|---|---|
| Per file upload | 40 GB (MAX_UPLOAD_SIZE_MB=40960) | Also applies to editor pictures. Public instance? Try 1024. Config |
| Batch total | Same as the upload limit | Together, selected files can't exceed it — convert in smaller groups. |
| Fit to exact size | 1–8192 px per side | Covers up to 8K-class frames. |
| ICO width | Max 256 px | Wider values are clamped to 256. |
| AI upscale output | 144 megapixels | Enough for 16K. Over-limit images show a short warning. |