Convert JPG to BMP
JPG in, BMP out, in a second or two — processed on your device, nothing uploaded.
Output format
What this tool does
It decodes your JPG file and re-encodes the pixels as BMP, losslessly. The file is read, converted and offered back as a download without touching the network.
About JPG
JPEG (files end in .jpg or .jpeg — they are the same thing) is the 1992 lossy photo format that every camera, phone and website understands. It throws away detail the eye is bad at seeing, which is why a photo can be 10× smaller than as PNG while looking identical at normal viewing sizes. It is good for photographs and anything photo-like, email attachments, marketplaces and forms that demand .jpg, and situations where compatibility matters more than anything; less good for text, line art, screenshots and logos (the compression smears sharp edges into visible "ringing"), and anything that needs transparency — JPEG has none. Universal, and the safest choice when a form, portal or older program insists on a specific format.
About BMP
BMP is the uncompressed Windows bitmap: the raw pixels with a small header. It dates from Windows 1.0 and is still what MS Paint, many scanners and some industrial or embedded tools produce by default. It is good for legacy software, embedded devices and a few specialist tools that require it; less good for almost everything else — it is huge (a 1920×1080 screen capture is 6 MB), carries no useful metadata and browsers won't show it inline on web pages. Opens on Windows and most desktop editors; web browsers can display it but websites never serve it.
What changes going from JPG to BMP
- Quality: nothing is lost — BMP stores the decoded pixels exactly, including whatever JPG compression artefacts were already there.
- Size: Typically 100 KB–4 MB for a phone photo depending on quality; re-saving a JPEG loses a little more quality each time vs. exactly width × height × 3 bytes plus a header, no matter what the picture shows.
- Metadata: EXIF (camera, date, GPS) is not carried over — the browser decodes pixels, not tags. That is a privacy plus for sharing and a minus if you rely on dates in the file.
For legacy software only
A 24-bit uncompressed BMP, exactly width × height × 3 bytes. There is no quality setting because nothing is compressed. Do this only when a program insists on .bmp.
How to convert JPG to BMP
- Drop the JPG file on the panel above or click to choose it.
- BMP is pre-selected. Press Convert to BMP.
- Download. The file is named after the original with a
.bmpextension.
Frequently asked questions
Is my JPG file uploaded?
No. The page is static and has no upload endpoint; your browser does the work on your own device and the result is saved straight back to your disk. The site's Content-Security-Policy only allows it to talk to its own origin, so it cannot send your file anywhere even by accident. Load the page, disconnect from the internet, and it still works.
Does JPG to BMP lose quality?
No. BMP is lossless: the pixels the browser decoded from your JPG are stored exactly.
Will transparency survive?
JPG has no transparency to begin with, so there is nothing to lose; the BMP output is fully opaque, exactly like the source.
Is it free? Any limits or watermark?
Free, no account, no watermark, no daily quota. Because nothing runs on our servers there is nothing to meter. The only limits are your device's memory — anything up to roughly 50 megapixels is fine on a modern phone or laptop.
Can I do several files at once?
One file at a time at the moment — drop the next one as soon as you have downloaded the first. Batch processing with a ZIP in and out is planned.
Does it work on my phone?
Yes — iPhone, iPad and Android browsers all run it. Large files take a few seconds longer on a phone than on a laptop.