24-bit or 32-bit BMP?

24-bit, unless the software you're using asks for 32-bit with transparency. 24-bit opens everywhere.

Why is my BMP so big?

BMP isn't compressed: every pixel takes 3 bytes at 24-bit, 4 at 32-bit.

Can I set the size of the BMP?

Yes. Use Resize for a maximum width and height or a percentage; it never enlarges.

Image to BMP Converter

Convert PNG, JPG, WebP, GIF, AVIF, SVG and other images to BMP in your browser — nothing is uploaded.

WebP, PNG, JPG, GIF, TIFF, BMP, AVIF, SVG or ICO, one or many. Drop them here or paste with ⌘V / Ctrl+V. Choose what each becomes on its row.

Runs on your device. Images are read and converted in your browser and aren't uploaded.

BMP

Uncompressed
Windows
Big files

Windows' plain bitmap: every pixel stored as it is, with no compression, so files are big and predictable. Paint, older Windows software and some machines and embedded displays still expect BMP. The usual 24-bit kind has no transparency; 32-bit can carry it.

BMP Converter — convert BMP files to any format

Learn more about converting images to BMP

When you'd do this

Old Windows software, an embedded display, a label printer, a game mod or a machine controller wants BMP files, and your images are PNGs, JPGs or anything else.

What to expect

A BMP's size depends only on its width and height: a 4032 × 3024 photo is exactly 36,578,358 bytes (about 35 MB) at 24-bit, and about 47 MB at 32-bit. Every pixel is stored as it is.

Recommended settings

24-bit (the default), which every BMP reader opens; transparent areas take the Background colour. Choose 32-bit only if the receiving software needs transparency and reads it — many programs ignore a BMP's alpha. Use Resize to match the size the device expects.

Where it opens

Windows (Paint, Photos and older programs), macOS Preview and most image editors — plus the devices and programs that only take bitmaps.

Good to know

Many apps ignore the transparency in a 32-bit BMP and show it on black or white.
BMPs are big — a phone photo is about 35 MB — so Resize first if the device has little storage.
Animated GIFs and WebPs give their first frame.

How to do it

Choose your images, or drop or paste them on the page — any mix of formats.
Each is set to BMP. Change one on its own row if you like, and set Background, BMP depth and Resize in Settings.
Convert all, then download each BMP, or all of them in one .zip.

Questions

24-bit or 32-bit BMP?: 24-bit, unless the software you're using asks for 32-bit with transparency. 24-bit opens everywhere.
Why is my BMP so big?: BMP isn't compressed: every pixel takes 3 bytes at 24-bit, 4 at 32-bit.
Can I set the size of the BMP?: Yes. Use Resize for a maximum width and height or a percentage; it never enlarges.