BMP to WebP Converter
Your BMP is perfectly fine as a picture but hopeless on a website, where every extra kilobyte slows the page. WebP is built for the web and can store the same image far more efficiently. Drop the bitmap here, set a quality, and download a WebP generated entirely inside your browser.
How to convert BMP to WEBP
- Add your BMP files by dropping them, clicking the drop zone or pasting.
- The output format is already set to WEBP. Adjust quality or size if you need to.
- Press Convert and compare the original and new size for each file.
- Download each file or all of them as a ZIP.
When to convert, and when not to
- You are preparing images for a website, blog or online shop and want smaller downloads.
- You need one format that can handle both photos and graphics.
- You want to keep the option of transparency in the result.
- Do not use it for files that must open in older desktop software or in print workflows; JPG or PNG is safer there.
What changes
- WebP here is encoded by your browser. The quality slider tunes how much detail is traded for a smaller file.
- Compared with an uncompressed bitmap, the output is normally much lighter, but the exact saving depends on the picture, so compare the sizes shown for your own files.
- WebP can store transparency, so no background colour is forced onto the picture.
- If your browser cannot write WebP, the converter will say so instead of silently giving you another format.
- Metadata is not copied to the new file.
Why people move from BMP to WebP
A bitmap is the opposite of web-ready. It keeps every pixel as raw data, so it grows quickly with the picture size. WebP was designed to keep visual quality high while using far less data, which is why it appears in site-speed advice for photos and graphics alike.
Because the same format handles lossy and lossless storage and supports transparency, one converter setting often covers jobs that would otherwise need both JPG and PNG.
Getting the quality setting right
Lower quality means a smaller file and more visible compression artefacts. Higher quality keeps more detail. A sensible way to choose is to convert the same bitmap at two or three settings and compare the result on a screen the way a visitor would see it.
Look closely at gradients, skin tones and text. If those look clean, the setting is good enough. If you see smearing, raise the slider.
Compatibility to keep in mind
Current mainstream browsers show WebP, but plenty of older programs, e-mail clients and upload forms still do not. If the picture has to travel outside the web, keep the original BMP or also export a JPG or PNG copy.
Because everything runs locally, you can experiment freely with different qualities without uploading anything anywhere.
If you manage a site, a sensible routine is to keep your original bitmap or a lossless PNG as the master, produce WebP versions for publishing, and re-export from the master whenever you change settings. Converting a WebP again and again compounds the loss, so always start from the original.
Remember to set sensible pixel dimensions as well. A bitmap straight from a scanner can be far larger than any layout needs, and reducing the width before encoding often saves more than any quality change.
Privacy: your files stay on your device
- The tool decodes, resizes and encodes your pictures with your browser. The files are never sent to a server.
- To check it yourself: open the browser developer tools (F12), open the Network tab, convert a file, and look for any request that carries your image. You will see none.
Frequently asked questions
Is WebP always smaller than the BMP?
For normal pictures it is very likely, because bitmaps are uncompressed. Still, check the size shown beside each converted file.
Does WebP lose quality?
It can, because the quality slider uses lossy compression. Raise it if you see artefacts.
Can I use the WebP in an e-mail or Word file?
Not always. Some programs do not read WebP. Use JPG or PNG for those cases.
Why do I see an error about WebP support?
Your browser may not be able to encode WebP. Try a current version of another mainstream browser.
Is anything uploaded?
No. The bitmap is decoded and encoded locally in your browser.