Compress BMP Images

BMP is a raw, uncompressed format that stores the full colour value of every single pixel with no optimization at all. A 10-megapixel image takes around 30 MB as a BMP, compared with just a few megabytes as JPG. Because none of that data is compressed, BMP files are dramatically bigger than the same image in any modern format.

Usually 70 to 90 percent smaller, which is the largest reduction of any format in our toolkit. Because BMP starts with zero compression, there's a huge amount of wasted space to remove. Choosing JPG output gives the biggest cut for photographs, while PNG output keeps perfect quality and still shrinks the file enormously.

If you choose PNG output, no — PNG is lossless, so every pixel is preserved exactly while the file becomes much smaller. If you choose JPG output, a small, usually invisible amount of detail is traded for an even smaller file, which is fine for photographs. Pick PNG when quality must stay perfect and JPG when size matters most.

No. All compression happens entirely inside your own browser using the Canvas API. Your BMP files are never uploaded, transmitted, or stored anywhere. There are no accounts, no tracking, and no server involved. Once the page has loaded you can even disconnect from the internet and the tool will keep working.

Rarely. BMP is a legacy Windows format that's been superseded by PNG, JPG, and WebP, which are far smaller and universally supported. You'll mostly run into BMP files exported by old software, scanners, or the classic Paint program. For any modern use, compress or convert them to a current format instead.

Support is inconsistent and BMP files are far too heavy for the web because of their size. Even where a browser can show one, the huge file slows the page down badly. Before publishing online, convert and compress your bitmap to PNG, JPG, or WebP, which display reliably everywhere and load much faster.

Choose PNG for graphics, logos, screenshots, and anything with sharp edges or text — it stays perfectly lossless. Choose JPG for photographs where the smallest possible file is what you want. If you need transparency support at a small size for the web, our BMP to WebP converter is another excellent option.

Yes. You can select multiple BMP files and compress them together as a batch — ideal for clearing out a folder of old bitmaps at once. Each image is processed locally in your browser, and you can download them individually or as a set. The practical limit is your device's available memory rather than any server quota.

No. The compressor reduces file size by re-encoding the bitmap into an efficient format only — the width and height in pixels stay the same. If you need a specific small file size such as 50 KB, dimension reduction may also be needed, which our dedicated target-size tools handle for you automatically.

Standard BMP files don't usually contain transparency, so there's typically nothing to lose. If your bitmap does have an alpha channel, choose PNG or WebP output to preserve it — both support full transparency. JPG output does not support transparency and will fill any clear areas with solid white.

Yes. The compressor is fully responsive and works on Android and iPhone browsers just like on desktop. If you receive an old BMP file on your phone, you can compress it into a modern, lightweight format right there — useful for sharing or uploading bitmaps without needing a computer.