Why are BMP files so big?

BMP stores every pixel uncompressed — three bytes a pixel at 24-bit — so a 1920 × 1080 image is about 5.9 MB whatever it shows.

Will BMP to JPG lose quality?

A little, as JPG is lossy — at 80% you're unlikely to see it in photos. For a lossless copy, convert to PNG.

Can I convert BMP files on a Mac?

Yes. This works in any modern browser — Safari, Chrome, Edge or Firefox — on a Mac, a Windows or Linux PC, or a phone.

All tools

BMP to JPG Converter

Convert BMP images to JPG 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

JPG

Lossy
Photos
Same as JPEG

The photo format: what cameras, phones and the web have used for decades. JPG makes photos small by leaving out detail the eye barely notices, and opens everywhere. It can't be transparent, and text and line art go soft at its edges.

JPG Converter — convert JPG files to any format

Learn more about converting BMP to JPG

When you'd do this

You've BMP files — from Paint, an old Windows program, a scanner or a machine's export — that are too big to email and won't upload where you need them.

What to expect

A BMP is uncompressed, so its size is fixed by its pixels: a 1920 × 1080 screenshot is about 5.9 MB at 24-bit, a 12-megapixel photo (4032 × 3024) about 35 MB. As a JPG at 80% it's usually a small fraction of that.

Recommended settings

80% (the default) for photos; 90% or more for screenshots with text, which JPG softens first — or choose PNG for those, which keeps them sharp and is still much smaller than the BMP.

Where it opens

Everywhere — phones, computers, browsers, email and every upload form.

Good to know

A 32-bit BMP's transparency is filled with the Background colour: JPG has none.
Screenshots and pixel graphics look crisper as PNG.
JPG is lossy; keep the BMP if you'll edit it again, or convert to PNG for a lossless copy.

How to do it

Choose your BMP files, or drop or paste them on the page — as many as you like.
Each is set to JPG. Change one on its own row if you like, and set Quality, Background and Resize in Settings.
Convert all, then download each JPG, or all of them in one .zip.

Questions

Why are BMP files so big?: BMP stores every pixel uncompressed — three bytes a pixel at 24-bit — so a 1920 × 1080 image is about 5.9 MB whatever it shows.
Will BMP to JPG lose quality?: A little, as JPG is lossy — at 80% you're unlikely to see it in photos. For a lossless copy, convert to PNG.
Can I convert BMP files on a Mac?: Yes. This works in any modern browser — Safari, Chrome, Edge or Firefox — on a Mac, a Windows or Linux PC, or a phone.