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Asset Compressor

Compress WebP images

Re-encode WebP files with Google’s libwebp at the quality you choose, in bulk, without uploading anything.

  • No upload
  • Free, no sign-up
  • Whole folders
  • Works offline

Drop images or a folder here

JPG, PNG, WebP, AVIF or BMP · no file limit

Processed on your device. Nothing is uploaded.

Output format

Keeps each file’s format. Files that can’t be made smaller are left untouched.

Quality78%
Smaller fileHigher quality

How to compress WebP images

  1. 1

    Add WebP files

    Drop individual WebP images or a folder of them onto the tool.

  2. 2

    Adjust quality if needed

    The default of 78% suits most web images. Lower it for thumbnails, raise it for detailed artwork.

  3. 3

    Cap the width (optional)

    Set a maximum width such as 1920 px to shrink oversized images even further.

  4. 4

    Download

    Get a single file or a ZIP that mirrors your folders.

Getting WebP files even smaller

Many tools export WebP at high quality settings. Re-encoding at 75–80% quality often saves another 20–50% while looking the same on screen.

Pair compression with a maximum width – for example 1920 px for full-width website images – to save even more on oversized images.

Lossy and lossless WebP

WebP has a lossy mode (like JPEG, for photos) and a lossless mode (like PNG, for graphics). Asset Compressor re-encodes to lossy WebP, which gives the biggest savings. If a file can’t be made smaller – common with already-optimized lossy WebP – the original is kept.

When re-compressing isn’t worth it

WebP files exported by image CDNs and modern CMSs are often already well optimized. Re-encoding them at a lower quality saves little and slowly adds artifacts, because each lossy pass removes a bit more detail. Asset Compressor protects you from the worst case by keeping any file that wouldn’t get smaller.

The biggest wins come from oversized images – a 4000 px WebP displayed at 1200 px – so combining compression with a maximum width is the most effective step.

Frequently asked questions

Will re-compressing WebP reduce quality?

Lossy WebP re-encoding discards a little detail each time. At the default quality this is not visible, and Asset Compressor never replaces a file with a larger one.

Can I convert WebP back to JPG or PNG?

Yes – choose JPEG or PNG as the output format, or use the WebP to JPG and WebP to PNG tools.

Is WebP transparency kept?

Yes. Transparent WebP images stay transparent after compression.

Are animated WebP files supported?

Only the first frame is processed, so animated WebP files become still images. Keep animations untouched if you need them to move.

What WebP quality should I use?

75–80% is the usual choice for photos on websites and in online stores. Use 85–90% for images with fine text or sharp graphics, and 60–70% for small thumbnails where every kilobyte counts. WebP quality numbers are not the same as JPEG’s, so compare the result in the slider.

Related tools

WebP to JPG

Need a JPG that works everywhere? Convert WebP images to high-quality JPEG in bulk, right in your browser.

WebP to PNG

Convert WebP images to lossless PNG files with transparency intact – ideal for editing, design tools and platforms that need PNG.

Resize images

Set a maximum width or height and every image is scaled down proportionally – and compressed at the same time.

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