BMP to PNG Converter
Convert BMP images to PNG without uploading them.
File
Result
Your converted file will appear here.
About the BMP to PNG converter
BMP stores pixels essentially uncompressed, which is why a modest screenshot can run to several megabytes. PNG stores the same pixels losslessly at a fraction of the size.
The conversion is lossless in both directions — nothing about the image changes except how efficiently it is stored.
The file is decoded, redrawn on a canvas and re-encoded by your browser. Nothing is uploaded, so there is no queue, no size cap imposed by a server, and no copy of your image left behind on someone else’s disk.
Why files shrink so much
PNG uses DEFLATE compression with per-row filtering, which is extremely effective on the flat colour and repeated rows typical of screenshots and diagrams. Reductions of 80% or more are common.
Frequently asked questions
Is any quality lost?
None. Both formats are lossless, so the pixels are identical.
Is my image uploaded to a server?
No. The conversion runs in your browser using the canvas API. The file never leaves your device.