BMP to PNG Converter

Bitmap Image File (BMP) is a uncompressed image format used for legacy windows assets, screenshots from old tools and lossless pixel dumps. Files saved as BMP usually come from Microsoft / IBM. Before converting, check that the source is the highest-quality copy you have, because every later step can only preserve what is already there.

The target is Portable Network Graphics (PNG), a lossless image format chosen for screenshots. Both formats store pixels losslessly, so this is a container and encoder swap: colours stay intact while the byte count and browser support change. The output keeps the original dimensions or sample rate unless you change them, so this step changes the encoding rather than the content.

PNG is lossless with full alpha support. The encoder here writes a standard RGBA image, so screenshots and logos stay pixel-exact at the cost of size. The output format supports transparency, yet the source has no alpha data, so the extra channel stays fully opaque. File size stays close to the source because both sides use comparable encoding efficiency.

This conversion runs locally in your browser tab through Canvas or FFmpeg.wasm. The file is read from your device, decoded, re-encoded and handed back as a download; it is not uploaded to a conversion server. That keeps private recordings, client material and unreleased artwork off shared infrastructure.

After the download, play or open the result before deleting the original. Check the first and last seconds, confirm that transparency, rotation metadata or sample rate survived, and compare file sizes. If something looks wrong, retry with a higher quality setting rather than converting the output again.