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DYNAMB

Image to WebP converter

Mixed folder of JPGs, PNGs and AVIFs to move over to WebP? Drop them all in together and this converter handles the batch in one pass, entirely inside your browser.

  • No upload — files stay on your device
  • Works offline once loaded
  • Free forever, no signup, no watermark
Drop images here, or tap to choose {{ acceptHint }} — up to 25 at a time, nothing is uploaded
Quality
Largest side (px, optional)
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  • After {{ totalConvertedLabel }}
  • Saved {{ totalSavedPercent }}%
  • {{ item.name }} {{ sizeLabel(item.sourceBytes) }} → {{ sizeLabel(item.blob.size) }} (−{{ savedPercent(item) }}%) · {{ item.width }}×{{ item.height }} Could not read this file waiting…

How to use this tool

  1. Add your images

    Drop in up to 25 files at once, or tap to choose them. Conversion starts straight away.

  2. Set quality and size

    Lower the quality slider to make files smaller, and cap the largest side if you also want fewer pixels.

  3. Download

    Save each file individually, or use Download all to get the whole batch.

Questions people ask

Which formats can I convert from?

Anything your browser can open: JPG, PNG, WebP, AVIF and GIF (the first frame). HEIC files from an iPhone only work in Safari, since other browsers cannot decode them.

Are my images uploaded anywhere?

No. The conversion runs in your browser using the Canvas API, and this site has no upload endpoint. Once the page has loaded you can go offline and it still works.

Is there a file size or batch limit?

You can convert 25 images at a time, and file size is limited only by your device's memory. Because there is no server involved, there is no daily cap and no account to create.

Does converting reduce the image quality?

Converting to PNG is lossless. Converting to JPG or WebP re-compresses the picture, so the quality slider controls the trade-off — 82% is a good default that most people cannot distinguish from the original.

Related tools

Free because it costs us nothing to run: your browser does the work, not our servers. Made by Dynamb Technologies — we build software for businesses.