BMP to PNG

Free BMP to PNG 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.

upload_file

Drop BMP files here or click to upload

Supports multiple files

Jump to the next useful tool without leaving your flow.

See more

About this tool

BMP files are uncompressed, so a single image can be many megabytes. BMP to PNG compresses losslessly: every pixel stays exactly as it was, but the file usually shrinks dramatically. It is ideal for screenshots, scans and graphics from older Windows software, scanners and lab equipment that still save BMP. Both formats are lossless, so nothing changes in the picture - only the file gets smaller. A BMP has no transparency to carry over, but as a PNG you can now erase the background later.

How to use this tool

  1. Add a folder of BMPsDrop in screenshots, scans or exports from older software and equipment.
  2. Convert losslesslyEach BMP becomes a PNG with every pixel unchanged.
  3. Download as a ZIPSave all the PNGs in one ZIP and free up the space the BMPs used.

Lossless and much smaller

PNG uses lossless compression, so text, line art and screenshots stay pixel-perfect - nothing is blurred or blocky. Graphics with flat colours compress especially well. For photographs, PNG still beats BMP but a JPG or WebP would be much smaller; choose PNG when exact pixels matter.

Where BMP files still come from

BMP is rarely chosen today, but it still appears: screenshots from older Windows programs, exports from scanners and medical or laboratory equipment, and graphics from old software projects. Each file holds every pixel uncompressed, which is why a single image can run to tens of megabytes.

Converting to PNG keeps every pixel exactly but stores them efficiently, so a folder of BMPs often shrinks to a fraction of its size. Delete the BMPs only after checking a few converted files open correctly.

Key features

  • Dramatically smaller files with zero quality loss.
  • Batch conversion for whole folders of scans and screenshots.

Common uses

  • Screenshots from older Windows apps.
  • Scans from scanners that save BMP.
  • Images from lab and industrial equipment.

Tips for better results

  • Use PNG for screenshots and text.
  • Use JPG for large photos to save more space.

Mistakes to avoid

  • Emailing raw BMP files.
  • Using PNG for very large photographs.

Supported formats

  • BMP
  • PNG

Frequently asked questions

Yes - PNG keeps every pixel exactly.

Often dramatically smaller, especially for graphics and screenshots.

BMP is simple to write, so older software and devices still use it.

Both formats are lossless, so every pixel survives the conversion exactly.

Files usually come out a little smaller.

Related guides