Free · In your browser · No upload
Convert images in bulk
Queue a batch, choose one output format, and download every converted file in a ZIP.
Settings
Just one image? Use convert an image.
Need more than one operation? Open the full editor to combine tools and reorder your edits.
Converting a whole folder to WebP is one of the highest-value things you can do to a set of web images. Across the photographs we measured, WebP came out between 12% and 70% smaller than JPEG at the same quality, and it supports transparency, which JPEG does not.
Input formats can be mixed freely — each file is decoded from whatever it happens to be and re-encoded to the single output format you choose. That makes this a practical way to normalise a folder that has accumulated PNGs, JPEGs, and the occasional GIF over the years.
How it works
- 1
Drop your images onto the workspace. A mixture of PNG, JPEG, WebP, GIF, and AVIF is fine.
- 2
Choose the output format for the whole batch, and a quality level if you picked a lossy one.
- 3
Click Process all. Each file shows its before and after size so you can judge the result before saving anything.
- 4
Download the ZIP, which keeps each original file name with the new extension.
Frequently asked questions
Can I convert mixed formats in one batch?
Yes. Every file is decoded independently using your browser’s image support and then re-encoded to the one output format you selected, so a folder containing PNGs, JPEGs, and GIFs converts in a single pass.
What happens to my file names?
Each file keeps its name with the new extension, so photo.png becomes photo.webp. If two files would end up with the same name inside the ZIP, a numeric suffix is added rather than one silently overwriting the other.
Should I convert everything to WebP?
For images served on the web, usually yes — it was smaller than JPEG on every photograph we tested and handles transparency. Keep JPEG for anything leaving the web, such as email attachments or files for print, where the widest possible compatibility matters more than a few kilobytes.
Will converting PNGs to JPEG lose my transparency?
Yes. JPEG has no alpha channel, so any transparent areas are flattened onto white during conversion. If your batch contains logos or cut-outs, convert to WebP instead, which keeps transparency and is generally smaller than the original PNG.
Is anything sent to a server?
No. Decoding, re-encoding, and zipping all happen in your browser. That also means the encoders are your own browser’s, so a batch converted in Chrome may differ marginally in size from the same batch converted in Firefox.