Choose a BMP file
Click the upload box or drag a .bmp bitmap file into the converter.
Free online image tool
BMP to PNG Converter
Convert BMP (Bitmap) images to PNG directly in your browser. No upload, no signup, no watermark. Shrinks large uncompressed bitmaps into tiny lossless PNGs.
Private browser conversion
Convert BMP to PNG
Choose a BMP (Bitmap) image and convert it locally in your browser. The file never leaves your device.
Input
Local conversion No server upload PNG output Free to use
How it works
Convert a BMP file in seconds.
Convert locally
Your browser decodes the BMP natively and re-encodes it as PNG with Canvas.
Download PNG
Preview the output and save the PNG file immediately.
Why convert
Why convert BMP to PNG?
BMP (Bitmap) is a classic Windows raster format that stores every pixel uncompressed. It's reliable and simple, but the files are huge — a 4K bitmap can easily weigh 50 MB or more, and many web browsers, chat apps, CMS uploaders, and design tools either reject BMP or handle it poorly. PNG is the modern replacement: fully lossless, universally supported, and 5–10x smaller thanks to compression. Whether you're rescuing legacy Windows exports, GIS output, screenshots, or scanned images, converting BMP to PNG makes them lighter and easier to share — without touching image quality.
Use cases
Who needs BMP to PNG conversion?
Windows & legacy software users
Old Windows apps, MS Paint, and some engineering tools still export BMP by default. Convert them to PNG so you can drop them into modern editors, docs, and email.
GIS & scientific imaging
QGIS, ArcGIS exports, satellite tiles and scientific instruments often produce large BMP files. PNG keeps the exact pixel data at a fraction of the size.
Web & document authors
Many browsers, WordPress, Notion, Slack, and Discord don't render BMP well. Converting to PNG unblocks uploads and previews everywhere.
FAQ
BMP to PNG questions.
What is a BMP file?
BMP stands for Bitmap. It's an uncompressed raster image format created by Microsoft for Windows. Because pixel data is stored raw, BMP files are exact but very large compared to PNG or JPG.
Are my files uploaded to a server?
No. Conversion happens entirely in your browser using JavaScript and Canvas. Your BMP file never leaves your device.
What BMP variants are supported?
Any BMP variant your browser can decode natively — including 24-bit and 32-bit uncompressed bitmaps, most 8-bit indexed BMPs, and standard Windows BMP v3/v4/v5 headers. Rare or corrupted headers may fail to decode.
Will the PNG have the same quality as the BMP?
Yes. The conversion is lossless — every pixel from the BMP is preserved in the PNG. PNG uses lossless compression on top, so the file gets much smaller with no visible change.
How much smaller is the PNG?
Typically 5–20x smaller for photos and screenshots. Solid-color and UI images can shrink by 30x or more. Highly detailed photographs shrink the least.
Does it work on mobile?
Yes. Modern mobile browsers can decode BMP files. Select a .bmp file from your device storage and download the converted PNG.
Is there a file size limit?
There's no hard limit, but very large bitmaps (e.g. 100 MB uncompressed BMPs) may take a moment to decode in your browser. Most BMP files convert in under a second.
Does the converter work offline?
Once the page has loaded, the conversion runs entirely in your browser and does not need an internet connection. You can use it after going offline.
Comparison
How this converter compares.
Most online BMP-to-PNG converters ask you to upload your file to their servers before sending back a result. Desktop tools like GIMP, IrfanView, or ImageMagick work but require installation and setup. This converter runs entirely in your browser — no download, no upload, no account, and completely free. For quick, private BMP-to-PNG conversion, there's no faster option.