Drop a file here or click to choose
Your file stays on your device. Processing happens locally in your browser.
What is Batch WebP / AVIF Convert?
Batch WebP / AVIF Convert turns a set of JPG, PNG, HEIC, AVIF, GIF, BMP or TIFF images into WebP or AVIF in your browser. Set the quality (82 is a good default), optionally cap the longest side, and download each file or one ZIP. For JPG, PNG or BMP output, the Batch Image Converter uses the same engine.
Batch convert images to WebP or AVIF and download a ZIP built on your device. Speed up sites with modern formats — a free bulk WebP converter on Fah Swe Tools that never uploads your files.
Key features
- WebP or AVIF output with a quality slider
- Optional longest-side limit
- Per-file downloads and one ZIP made on your device
- Unreadable files skipped and reported
- Up to 20 files per batch free; fewer on low-memory devices
- Runs in your browser — nothing is uploaded
Popular uses
- Pass PageSpeed's 'serve images in next-gen formats' check
- Convert a WordPress or Shopify image folder to WebP
- Shrink a set of screenshots for documentation
Supported formats
Input: JPG, PNG, WebP, AVIF, HEIC/HEIF, GIF, BMP, TIFF. Output: WebP or AVIF.
Troubleshooting
- A file came out bigger than the original Small, already-optimised PNGs or JPGs sometimes don't shrink. Lower the quality a little, or keep those originals.
- AVIF is slow AVIF takes a few seconds per photo to encode on your device, and longer in Firefox. Choose WebP when speed matters more than the last few kilobytes.
- One file shows an error It couldn't be decoded. The others still convert.
Also known as: Bulk WebP Converter, Convert Images to WebP, PNG to WebP Bulk, JPG to WebP Bulk.
How it works
- Add your images — JPG, PNG, AVIF, HEIC, GIF, BMP, TIFF or WebP. They stay on your device.
- Pick WebP or AVIF, set the quality (82 is a good default) and, if you like, a longest-side limit.
- Download each file or all of them as one ZIP made in your browser.
FAQ
WebP or AVIF?
WebP encodes fast and opens everywhere. AVIF is usually smaller still, but takes a few seconds per photo to encode on your device (longer in Firefox).
Single-file convert?
Use Convert Image for one-off format changes.
How many images at once?
Up to 20 per batch on the free plan, fewer on phones with little memory. A file that can't be read is skipped and reported; the rest still convert.
Are my images uploaded?
No. Converting and zipping happen in your browser.
Is WebP better than JPG?
For websites, usually: WebP is often 25–35% smaller at similar quality and supports transparency.