BMP to PBM converter
Convert BMP to PBM in seconds, free and unlimited. No upload, no sign-up, no watermark: your image never leaves your device.
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Quick answer: To convert BMP to PBM, add the BMP file to the iHateFiles BMP to PBM converter and press Convert. The conversion runs in your browser, so the file is never uploaded, and it is free with no sign-up, watermark or size limit. BMP carries transparency and PBM cannot, so transparent areas are filled with a background colour you choose.
Should you convert BMP to PBM?
Do this when the image is going somewhere that will not accept BMP, and you are content to fix the background colour permanently.
Nothing is discarded
BMP and PBM are both lossless, so every pixel survives the move intact. Convert back and forth as often as you like; the image does not degrade.
PBM cannot hold transparency
Any transparent area in the BMP has to become a real colour, because PBM has no alpha channel to record it. The background colour on this page is what those areas become. White suits most uses; pick the colour of the page it will sit on if you know it, because this cannot be undone afterwards.
PBM reduces the colour first
Before PBM compresses anything it reduces the image to pure black and white. Flat colour, logos and line art survive that easily. A photograph coming from BMP will band visibly, and no quality setting changes it, because the limit is the format rather than the encoder.
BMP and PBM side by side
| BMP | PBM | |
|---|---|---|
| Compression | Lossless | Lossless |
| Transparency | Yes | No |
| Animation | No | No |
| Written here | Yes | Yes |
What usually goes wrong
About the BMP. The file size surprises people. There is no compression to speak of, so the size depends only on the dimensions, not on how complicated the image is.
About the PBM. Converting a photograph to PBM produces something closer to a stencil than a picture. That is the format working correctly, not a fault.
How to convert BMP to PBM
- Add your BMP file. It is read from your disk and stays there.
- Check the settings. The output format is already set to PBM.
- Press convert and the PBM file is saved back to your device.
Questions
How do I convert BMP to PBM?
Open this page, add your BMP file, and press convert. The file is decoded and re-encoded by your own browser and saved back to your device. Nothing is uploaded.
Is this BMP to PBM converter free?
Yes, completely. There is no account, no sign-in, no watermark and no daily limit, because there is no server doing the work. Your own device does it.
Are my files uploaded anywhere?
No. There is no upload endpoint. The conversion runs inside this browser tab, so your file never leaves your device. You can open your browser's network panel and watch: nothing carrying your file is sent.
Is there a file size limit?
No fixed limit. Because the work happens on your machine there is no server quota. The only ceiling is your own device's memory, which for video means very large files may be slow.
Will converting to PBM lose quality?
PBM compresses without loss, but it first reduces the image to one bit per pixel, pure black and white. Flat colour and line art come through unchanged; a photograph will band and lose subtlety.
Can I convert several BMP files at once?
Yes. Add as many as you like and they are converted one after another, then offered as a single ZIP.