BMP -> JPG · Local tool
BMP to JPG
Turn uncompressed BMP files into JPG, which is a fraction of the size.
Last updated
01 / Your device
the file stays here
02 / Browser memory
the work runs locally
03 / Back to you
saved on this device
When you would use this
Situations, not settings.
- A screenshot saved by an old Windows tool
- Capture programs and scanner drivers still default to BMP, and the file is enormous for what it actually shows.
- A bitmap too large to email
- Zipping does almost nothing, because there was never any compression to improve on. A JPG clears the attachment limit easily.
- Scans from older imaging software
- Some scanner suites write raw bitmaps by default. JPG is the format everyone downstream expects them in.
How it works / no cloud
A conversion engine, not an upload form.
Your browser decodes BMP, so filetity reads the bitmap with the browser's own codec, redraws it and encodes a JPG at the quality you choose. A BMP stores every pixel raw, which is why the saving here is larger than in most conversions. Nothing is uploaded.
- Offline ready
- Installable app
- No file limit queue
Straight answers
No accordion. Nothing hidden.
- Is it free?
- Yes, with no watermark and no page limit.
- Does it need an account?
- No. There is no account system.
- Is my file processed on my device?
- Yes. The file is read by your browser and never uploaded. There is no server to send it to.
- What formats are supported?
- BMP in. JPG out, one file per image, or a ZIP when you convert several.
- What are the limits?
- No image count limit. Very large bitmaps are bounded by the memory your browser will give a canvas, and a BMP is large by definition: 4000 by 3000 pixels is about 48MB at 32 bits per pixel.
- Does it work on mobile?
- Yes, on any modern mobile browser. Large files are limited by the memory the phone gives the browser.
- Does it work offline?
- Yes, once the page has loaded. The tool keeps working with no network connection.
- Why is my BMP so big?
- Because it is not compressed. A BMP writes out every pixel one after another, so the size is width times height times the bytes per pixel, whatever the picture happens to be. That simplicity is also why screen capture tools and older Windows software still default to it.
- How much smaller will the JPG be?
- A great deal. Against an uncompressed source, even a high quality JPG usually lands at a small fraction of the original, because it is competing with no compression at all rather than with good compression. The measured figure is shown before you download.
- Does the conversion lose anything?
- Yes. JPG is lossy, and this is the first lossy pass the picture has taken. For a photograph that is invisible at a sensible setting. For a screenshot with text in it the halos around the letters show, and PNG is the better target.
- Does a BMP have transparency to lose?
- Almost never. The BMP files people actually have are opaque, written by screen capture, scanners and older Windows programs. If yours is one of the rare 32 bit files with an alpha channel, convert to PNG instead and keep it.
Keep working locally
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