BMP to WebP

Free BMP to WebP converter - convert in your browser, no upload, no sign-up.

100% free. Runs entirely in your browser - your files and data never leave your device and nothing is uploaded to any server.

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Drop BMP files here or click to upload

Supports multiple files

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About this tool

Convert BMP images to WebP straight in your browser. BMP is an uncompressed Windows format that stores every pixel at full size, and BMP files are enormous - a single phone photo can run past 20 MB - which is usually why you are here. WebP is Google's web format, which keeps transparency while compressing far better than PNG. Files usually come out noticeably smaller, because WebP compresses much harder than BMP. WebP is a lossy format, so a small amount of detail is discarded. At the quality this tool uses that is invisible on a photograph, but fine text and sharp edges - screenshots especially - can soften slightly. WebP supports transparency, but converting cannot invent it - a BMP has no transparent pixels to carry over. You gain the ability to erase a background later, not a background that is already gone. Everything happens locally. Your BMP files never leave the device, so there is no file-size limit and no waiting for a server to get to you.

How to use this tool

  1. Add your BMP filesClick the box or drag BMP images onto it. Nothing is uploaded - your browser reads the files directly.
  2. Let it convertEach image is decoded and re-encoded as WebP on your device. A large batch takes a moment; nothing is queued on a server.
  3. Download your WebP imagesSave them one at a time, or take the whole batch as a single ZIP.

Key features

  • Batch conversion - drop a whole folder and convert it in one pass.
  • No sign-up, no watermark and no file-count limit.
  • Shows the before and after size of every file, so you can see what the conversion cost or saved.
  • Converts BMP to WebP without uploading anything.
  • Works offline once the page has loaded.

Common uses

  • Shrinking site images before publishing, without paying for an image CDN.
  • Converting a batch of BMP files handed over by a client or a colleague.
  • Preparing BMP images for a platform that rejects the format on upload.
  • Getting BMP images into a document, presentation or email that refuses to embed them.
  • Opening a BMP in software that only accepts WebP.

Tips for better results

  • Convert from the highest-quality BMP you have, not one that has already been resized or re-saved.
  • Confirm your platform accepts WebP before publishing - most modern websites do, most print shops and older desktop apps do not.
  • Batch the whole folder in one pass - converting one file at a time is the slow way to do this.

Mistakes to avoid

  • Expecting WebP to repair a low-quality BMP. Conversion changes the container, never the pixels already inside it.
  • Renaming the file extension by hand instead of converting. That changes the name, not the data, and the file simply fails to open.

Supported formats

  • BMP
  • WebP

Frequently asked questions

Drop your BMP files onto the box above and download the WebP results. It all happens on your device - no upload, no account, no queue.

WebP is a lossy format, so a small amount of detail is discarded. At the quality this tool uses that is invisible on a photograph, but fine text and sharp edges - screenshots especially - can soften slightly.

WebP supports transparency, but converting cannot invent it - a BMP has no transparent pixels to carry over. You gain the ability to erase a background later, not a background that is already gone.

Yes, completely - no sign-up, no watermark and no limit on how many files you convert. The work runs in your browser, so it costs nothing to provide.

Files usually come out noticeably smaller, because WebP compresses much harder than BMP.

No. The conversion uses your own device's image engine, so your BMP files never leave your computer. That also means it works with confidential material and on a slow connection.

Yes. Add as many as you like and they are processed together, then download them one by one or as a single ZIP.

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