PNG to BMP
Write a PNG as an uncompressed 32-bit BMP. The output is width times height times four bytes plus a 54-byte header, whatever the picture holds.
Runs on your device. The file is never uploaded.
PNG to BMP writes rows of raw pixels under a 54-byte header, so the size of the output follows from the dimensions alone. A 600 by 600 picture lands at 1,440,054 bytes whether it holds a photograph or a blank square. Nothing this encoder writes is compressed, and no option here changes that.
Questions
Does PNG to BMP upload my files?
No. PNG to BMP runs inside this browser tab, in a Web Worker on your own machine, and no part of your file is sent anywhere. There is no upload step to skip — the tool cannot reach a server even if it wanted to, and the counter on the homepage shows the number of outbound requests the page has made: zero.
How many files can I use at once?
Drop as many as you like. Each file is handled separately and comes back as its own result, so twenty files in means twenty results out.
What can I change about the result?
Nothing to configure — it does one thing, and the result is the same every time you run it on the same input.
Is PNG to BMP free, and do I need an account?
It is free and there is no account, no sign-in and no quota. Nothing is metered because nothing runs on a server — the only limit is your own device's memory, which is what decides how large a file it can handle.
Does it work offline?
Yes. The whole site is stored in your browser after the first visit, so PNG to BMP keeps working with the network off. Tools that use a machine-learning model download that model once, on first use, and run offline afterwards.
Can I use PNG to BMP outside the browser?
Yes. Every tool here is the same code on three surfaces: this page, a CLI command, and an MCP tool an AI agent can call. `png-to-bmp` is the name it goes by on all three.