How to convert PNM to BMP
To convert PNM to BMP, upload your PNM file, choose BMP as the output format and press Convert. The finished BMP file is ready to save to your phone or computer in seconds, free, with no watermark and no sign-up. Your file is deleted from our server about 30 minutes after the conversion.
This free online converter changes PNM images into BMP files in seconds, with no software to install and no watermark. You can convert several files at once, resize them and choose the quality for formats that support it. Metadata such as location tags is removed from the output for privacy.
Reasons to switch from PNM to BMP
- No compression artefacts
- Very simple to read
- Supported by every Windows program
- Works with: Windows, macOS, Linux and most image editors
What to expect from this conversion
- Both formats store the pixels without loss, so the picture stays identical. Only the file size and compatibility change.
PNM vs BMP
| Property | PNM | BMP |
|---|---|---|
| Full name | Portable Anymap | Windows Bitmap |
| Released | 1988, Jef Poskanzer (Netpbm) | 1986, Microsoft |
| Compression | None (uncompressed) | None (uncompressed) |
| Transparency | No | No |
| Animation | No | No |
| Bit depth | 1, 8 or 16-bit | 1 to 32-bit |
| Shown in browsers | No | Yes |
| Best for | Unix-style image pipelines; teaching and research | legacy Windows software; embedded devices |
Steps to convert PNM to BMP
- Drop your PNM image file onto the converter, or click to choose it.
- Check that BMP is selected as the target and adjust the options if you want.
- Press Convert, then download your new BMP file when it finishes.
Tips for the best result
- Use quality 80 to 90 for photos: it is visually close to the original at a much smaller size.
- Set a width if the image will be shown on a small screen, which also reduces the file size.
- Choose a background colour before converting transparent images to a format without transparency.
Frequently asked questions
How do I convert PNM to BMP?
Drop your PNM files on the converter, confirm that BMP is the target and press Convert. Download each file or the whole batch as a ZIP.
Is the PNM to BMP converter free?
Yes. It is free with no watermark, no sign-up and no limit on how many images you convert. The site is supported by ads.
Does converting PNM to BMP reduce quality?
Both formats store the pixels without loss, so the picture stays identical. Only the file size and compatibility change. The quality slider only affects formats that use lossy compression.
Will transparency be kept when I convert PNM to BMP?
PNM images do not contain transparency, so there is nothing to lose. BMP does not support it either.
Which programs open BMP files?
BMP files open in Windows, macOS, Linux and most image editors.
How many images can I convert at once?
Up to 20 images per batch, each up to 60 MB. Files are deleted from the server about 30 minutes after conversion.