PNG to BMP Converter — 24-bit, Lossless Pixels
Convert PNG images to true 24-bit BMP files in your browser — pixel-exact, no upload. For legacy and specialty systems. No upload — runs 100% in your browser
or click to browse
How to use this tool
- Drop a PNG file onto the box.
- The pixels are decoded locally and written as a 24-bit BMP.
- Click Download — expect a large file; that is the format.
The format that refuses to die
BMP is the oldest mainstream raster format: raw pixels, bottom-up rows, essentially no compression. Modern web use has moved to PNG and JPEG, but a long tail of systems — legacy Windows applications, industrial controllers, lab instruments, print pipelines — still asks for a BMP by name. This converter produces a true 24-bit BMP file, written byte by byte in your browser: the pixel values in the output are exactly the pixel values decoded from your source image, with transparency (if any) flattened to white.
Uncompressed means predictable
The size is arithmetic: width × height × 3 bytes, padded to 4-byte rows. Nothing to tune, nothing to degrade — a 1920×1080 BMP is always 5.9 MB. If you need small rather than exact, the compression tools on this site do that job; BMP is for when the receiving system demands BMP.
Frequently Asked Questions
Are my files uploaded to a server?
No. Everything on this page runs inside your browser using JavaScript and WebAssembly. Your file never leaves your device — you can even disconnect from the internet after the page loads and the tool still works.
Why is the BMP file so large?
24-bit BMP is uncompressed: 3 bytes per pixel, always. A 12-megapixel photo is ~36 MB. That is what the format is — the page says the size up front rather than hiding it.
Is quality preserved?
Yes — the pixels you get are exactly the pixels in your source image. PNG decoding is lossless and the BMP stores raw values.
Who still needs BMP?
Legacy Windows software, some industrial/embedded devices, lab equipment, and certain embroidery or CNC pipelines that predate PNG support.