FreeNo uploadNo sign-upBatch
Compress WebP Images
Shave more weight off WebP images for faster websites. Transparency is kept.
Drop WebP images to compress
batch and mixed formats welcome
- Private by design. Converted inside your browser.
- Instant. No upload queue, no waiting.
- Unlimited. Convert hundreds of files, download as ZIP.
How to compress WebP images
Add your WebP images
Drop files on the tool, click Choose files or paste from the clipboard. Add as many as you like.
Set the quality
Move the quality slider. Lower means smaller files; the before and after sizes update instantly.
Download smaller files
Save each file or download everything as a ZIP. Files that cannot get smaller are returned unchanged.
Even lighter WebP for faster pages
WebP is already efficient, but images exported at 100% quality or saved losslessly can still be heavy.
Re-encoding at 70–85% quality usually cuts the size substantially while keeping images sharp, which helps page speed scores.
Frequently asked questions
Can a WebP file be made smaller?
Often, yes, especially if it was saved at high quality or losslessly. If not, the original is returned.
Does it keep transparency?
Yes. WebP supports transparency and it is kept.
Will it work in Safari?
Yes. If Safari cannot encode WebP natively, a small encoder is loaded automatically.
Is my image uploaded?
No. Compression runs entirely in your browser.
Are my files uploaded to a server?
No. formatmath converts files with code that runs inside your browser. Your files are never uploaded, stored or seen by us.
Is it free?
Yes. There is no watermark and no daily limit. An account is optional and only keeps a history of your conversions.