BMP to PNG Converter

Runs in your browser — your files are never uploaded.

Convert Windows BMP images to PNG. A BMP stores every pixel uncompressed, so even a modest screenshot runs to several megabytes; PNG stores exactly the same pixels losslessly and typically lands under a fifth of the size. Nothing is degraded, and the result opens everywhere a BMP does and many places it does not. Runs entirely in your browser.

OptionsMax width: Original size

How to convert BMP to PNG

  1. 1

    Drop your .bmp file onto the box, or click to choose one.

  2. 2

    OkConverter decodes the bitmap and re-encodes it as a lossless PNG.

  3. 3

    Click “Download” to save the PNG.

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Frequently asked questions

Is any quality lost?+

None. PNG is lossless, so the PNG holds exactly the pixels the BMP did — this is compression, not re-rendering. The image is identical; only the file size changes.

How much smaller will it be?+

Typically 60–90% smaller. Screenshots, diagrams and flat-colour graphics compress hardest; detailed photographs the least. BMP applies no compression at all, so almost anything is an improvement.

Is transparency preserved?+

Yes, where it exists. Most BMPs are fully opaque, but 32-bit BMPs can carry an alpha channel and that is carried over to the PNG.

Can I convert PNG back to BMP?+

Not with this tool. No browser can encode BMP from a canvas, so BMP is input-only here — and since PNG is lossless and universally supported, there is rarely a reason to go back.

Are my files uploaded?+

No. The conversion runs entirely in your browser on your device. Your image is never uploaded, stored, or logged.

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