Why convert BMP to PNG?

BMP is an uncompressed bitmap format, so files are large. PNG uses lossless compression that keeps the exact same pixels while producing a much smaller file that web pages and apps accept.

Does converting BMP to PNG lose quality?

No. PNG is lossless, so the converted image keeps the exact pixels of the source BMP at its original dimensions — the picture is identical, only the file is smaller.

How much smaller will the PNG be?

It varies with the image, but because BMP stores every pixel uncompressed, PNG often shrinks the file dramatically — simple graphics and screenshots can shrink the most. The tool shows the before and after size for each file.

Can I convert several BMP files at once?

Yes. Drop multiple bitmaps and each one is decoded and re-encoded to PNG, then listed with its own size comparison and download button.

Does it keep transparency?

PNG supports transparency, but classic BMP usually has none. The conversion preserves whatever the source contains; it does not add or remove transparency.

Are my images uploaded to a server?

No. Conversion happens entirely in your browser using the HTML canvas — your images are never uploaded, stored or seen by anyone.

BMP to PNG Converter

Convert BMP bitmaps to PNG without uploading them

BMP (Windows bitmap) files store every pixel uncompressed, so they are large and awkward to share. PNG keeps the exact same pixels with lossless compression, producing a much smaller file that virtually every editor, browser and app supports.

How it works

Each BMP you add is decoded by the browser into an image, drawn onto an HTML <canvas> at its original dimensions, then re-encoded with canvas.toBlob("image/png"). Because PNG is lossless, no pixels change — only the storage format does. There is no quality slider because nothing is thrown away; the PNG is simply a compressed copy of the same picture. The tool reports the original and converted size for each file.

Example

A 1920×1080 uncompressed 24-bit BMP holds roughly 6 MB of raw pixel data. Run through the converter it stays 1920×1080 and pixel-identical, but the PNG output is typically a fraction of that size:

Format	Compression	Same pixels?
BMP (source)	None (raw)	—
PNG (output)	Lossless	Yes, identical

Everything runs locally in your browser — your images are never uploaded, stored or seen by anyone, which makes it both faster and private by design.