Free BMP to WEBP Converter: No Sign-up, Files Never Uploaded
Turn BMP files into WEBP for free, with no sign-up and no upload. The conversion happens in this tab, so your files never leave your computer or phone.
The picture is decoded into pixels and encoded again as WEBP, one file at a time, on your own processor. WEBP can hold animation, but a still BMP file stays a single frame.
This pair runs on code that is already in the page, so there is no extra engine to download.
- Free
- No sign-up
- Never uploaded
- No watermark
Your files are converted on your device and never uploaded.
How to convert
- Add your BMP files by dragging them onto the converter or by using the file picker.
- Check that WEBP is the selected target format; it is already chosen on this page.
- Open the options if you want to change quality, size and background colour, or keep the defaults.
- Press Convert and watch the progress shown for each file.
- Download each result, or take them all together as one ZIP when you converted several files.
Features
- Reads .bmp and writes .webp.
- Free, with no watermark added to the result.
- No sign-up and no login.
- Your files are never uploaded and never leave your device.
- Batch conversion with a ZIP download for several results.
- The input is recognised by its content, not only by its file name.
- WEBP keeps transparency where the source has it.
Supported formats
About the formats
About BMP
Usually stores raw, uncompressed pixels, so files are large.
Very simple to read, which keeps it common in older software.
Introduced with Microsoft Windows.
About WEBP
Supports both lossy and lossless compression, plus transparency and animation.
Usually smaller than JPEG or PNG at similar quality.
Developed by Google and released in 2010.
BMP vs WEBP
BMP uses lossless compression; WEBP uses both lossy and lossless settings.
BMP does not support transparency, and WEBP does.
BMP does not hold animation, and WEBP can.
BMP files use the .bmp extension and WebP files use .webp, so the converted file gets a new name with the new extension.
Privacy: how it works
- Your BMP files stay on your device. The page reads each file with the browser's file API, converts it with code running in the tab, and hands the result back as a download. No upload happens, so there is no copy of your file on our servers to protect, delete or leak.
- There is nothing to sign up for and no login. The converter does not ask for an email address, and it does not need to know who you are to do its job.
- You can check the claim yourself: open your browser developer tools, watch the Network tab while a file converts, and you will see no request that carries your file.
Tips
- Keep your original file. A lossy format cannot be turned back into the exact original pixels.
- Pick the quality setting by looking at the result, not by guessing: a lower value gives a smaller file and a visible loss of detail.
- Convert logos and screenshots to a lossless format, and photographs to a lossy one, to keep file sizes sensible.
- Resize before converting when the picture is much larger than where you will use it.
- WEBP can hold animation, but a still BMP file stays a single frame.
Frequently asked questions
Is it really free?
Yes. There is no price, no trial, no credit card and no watermark added to your results. Ulkaa Tool does the conversion with your own device, so there is no server bill to pass on to you.
Are my files uploaded?
No. Your BMP files are read and converted inside your browser and are never sent to Ulkaa or to anyone else. The result is created on your device and you save it from there.
Do I need an account?
No. There is no sign-up and no login. Open the page, add your files and convert. An Ulkaa account is not needed for anything on this tool.
Is there a file size limit?
No limit is set by us. The real limit is your device: the conversion uses your own memory and processor, so very large files can be slow, and a very big batch may need to be split into smaller runs.
What is the difference between BMP and WEBP?
BMP uses lossless compression; WEBP uses both lossy and lossless settings. BMP does not support transparency, and WEBP does. BMP does not hold animation, and WEBP can.
Can I convert many BMP files at once?
Yes. Add as many files as your device can handle. Each one is converted on its own and you can download them one by one or as a single ZIP.
Will anything be lost when I convert BMP to WEBP?
WEBP can hold animation, but a still BMP file stays a single frame.
Can I convert WEBP back to BMP?
Yes. Open the WEBP to BMP page and use the same steps. Converting back does not undo any loss from the first conversion.