Works for BMP to JPEG as well
JPG and JPEG are the same format with a shorter and a longer extension. Add a .bmp and you get a .jpg back, so there is no separate tool to look for.
BMP to JPG Converter
Add a .bmp file and get a much smaller .jpg back. If your BMP has transparency, read what happens to it first.
To convert bmp to jpg, add the .bmp file, keep JPG as the output format and download the result. In our test, a 3.8 MB 32-bit bmp became a 37 KB jpg with the same 1200 × 800 pixel size, and its transparent areas turned into the colour stored under them, not black.
Transfers use HTTPS, and files converted on the free tier are deleted after 24 hours, so the result is not a long-term archive. Quality depends on the source file, so open the JPG file once before you share it.
FromBMPLosslessTransparency
BMP (Windows Bitmap)
A raster format introduced by Microsoft that stores pixels with little or no compression, so files are large. It supports depths from 1 to 32 bits per pixel, and version 5 added optional alpha and embedded colour profiles. A 32-bit file may or may not use its fourth byte for transparency. Files begin with the letters BM.
ToJPGLossy
JPEG (Joint Photographic Experts Group)
A lossy photo format from the early 1990s built on block-based DCT compression. It is limited to 8-bit standard dynamic range with no alpha channel, yet it opens in practically every editor, viewer, email client and content management system.
A 1200 × 800 px 32-bit BMP with an alpha channel and an embedded sRGB profile, converted on indox.org
- BMPthe original, 32-bit with alpha
- 3.8 MB
- JPGfrom indox, magenta stored under alpha, about 104× smaller
- 37 KB
- JPGfrom indox, white stored under alpha, about 83× smaller
- 46 KB
Why use indox to convert BMP to JPG?
Nothing to install, any device with a browser
The conversion runs on indox servers, so it works on Windows, Mac, Linux and phones without Paint, Photoshop or a command-line tool.
Tried with and without sign-in
We ran four conversions as an anonymous visitor and saw no sign-up wall, limit message or paywall text. We have not measured a daily cap.
What happens to transparent BMPs
Below is what our test showed for a 32-bit BMP with an alpha channel, so you can tell before converting whether the result fits.
What happens to your BMP
Stays
- Your original BMP, which is not touched
- The pixel size, 1200 × 800 in our test
- The picture as seen on opaque areas, close to the source
- Whatever colour is stored under transparent pixels, which now shows
Changes
- Compression: lossy JPG replaces the BMP's raw pixels
- File size: 3.8 MB became 37 KB in our test, about 104 times smaller
- Transparency: alpha is ignored, so transparent areas show their stored colour
- Colour profile: the embedded sRGB profile is dropped and no EXIF is written
How do I convert BMP to JPG online?
- 1
Add your BMP file
Drop the .bmp on the box or choose it from your device. Keep the original: a JPG cannot be turned back into the exact BMP.
- 2
Confirm JPG, then start the conversion
Check that JPG is the output format, then start the conversion. In our test it took 3.7 seconds from the click to Completed for a 3.8 MB file.
- 3
Download the JPG and check the edges
Save the JPG and open it once. If the BMP had transparent areas, look at what colour they became before you use the file.
What do I get from indox's BMP to JPG converter?
You hand over a BMP and take away a JPG that is small enough to email, upload or put on a web page. The page also states what happens to transparency and colour profiles.
- One smaller JPG for the BMP you add, in a few clicks
- Nothing installed on Windows, Mac or a phone
- Transparency behaviour taken from a real test
- Your original BMP is left as it was
What are the limits for BMP to JPG?
Size
The upload box shows the live size limit before you add a file. Signing in raises it; a paid plan does not change it.
Formats
BMP in, JPG out. Pick another output on the converter if you need a different format.
Privacy
Files are encrypted in transit over HTTPS and processed on indox infrastructure.
Deletion
Free-tier files are kept for 24 hours after the job finishes, then deleted automatically.
Limits worth knowing
- Transparency is lost. A JPG cannot hold an alpha channel, and this converter does not flatten onto a colour of your choice. In our test transparent pixels showed their stored colour, magenta in one file and white in the other. If your BMP has transparent areas, use PNG instead, or fill the background in an editor first.
- JPG is lossy. The result is a smaller approximation of the BMP. Screenshots, line art and small text can show blocky detail around edges, and saving a JPG again compounds the loss.
- We tested only the default settings. We did not change quality or size, so we cannot tell you what other settings do here.
- The colour profile is not carried over, so a BMP with an embedded profile may look slightly different in colour-managed apps.
- We did not find a documented upload size limit and did not test a very large BMP. A huge uncompressed file may be slow or may fail to upload.
When the result is not what you expected
| What you see | Why | What to do |
|---|---|---|
| A magenta, white or odd coloured area where the BMP was transparent | JPG has no alpha, and the stored colour under transparent pixels shows through | Convert to PNG with BMP to PNG, or fill the background in an editor before converting |
| Blocky detail around text or edges | JPG compression discards fine detail | Keep the BMP master and use the JPG for sharing only |
| Colours look slightly different | No colour profile is written to the JPG | Compare against the original and keep the BMP for colour-critical work |
| The upload fails on a very large BMP | Uncompressed bitmaps are huge and we did not test a size limit | Try a smaller copy, or resize the image in an editor first |
| You need a document, not a picture | A JPG is a single image | Convert the JPG with JPG to PDF |
What do the free and paid plans add?
Free
- All converters
- Daily credit refresh
- Email support
Basic
- Access to all features
- AI Extract
- Priority conversions
- Email support
Highest priority
Premium
- Everything in Basic
- Highest priority queue
- Priority support
Pay-As-You-Go
- No subscription
- Credits never expire
- Opt-in auto-refill
- Access to all features
Which conversions are close to BMP to JPG?
BMP vs JPG: what is the difference?
| Compared on | BMP | JPG |
|---|---|---|
| Compression | None or simple lossless, so files are large | Lossy, so detail is approximated and files are small |
| Transparency | Optional alpha in 32-bit files | No alpha channel |
| Colour profile | Version 5 can embed one | Can carry one, but this converter writes none |
| Where it opens | Windows tools and many editors | Practically every browser, phone, editor and email client |
| Typical use | Legacy Windows images and raw pixel output | Sharing, uploads and web pages |
Who can use a BMP to JPG converter?
When to use it
- Emailing a BMP that is too large for the attachment limit.
- Uploading a bitmap to a site that accepts JPG and PNG but rejects BMP.
- Making a lightweight preview of a large uncompressed image for a web page.
- Saving space on a folder of old Paint images you will not edit again.
Where can I read more about converting files?
Sources
- BMP Windows BitmapLibrary of Congress
- JPEG baseline, ISO/IEC 10918-1 and ITU-T T.81Library of Congress
- JPEG 1 (ISO/IEC 10918, ITU-T T.81)JPEG Committee
Facts checked on November 4, 2026
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BMP to JPG FAQs
Is BMP to JPG free, and do I need to sign up?
We converted a BMP as an anonymous visitor on 4 November 2026 and saw no sign-up wall, limit message or paywall text in four conversions. We have not tested what happens after many files, so we make no promise about a daily allowance.
Why does my transparent BMP show a coloured background in the JPG?
A JPG has no alpha channel. In our test the converter ignored the alpha values and kept the colour stored under each transparent pixel. One file with magenta stored there came out magenta, and one with white stored there came out white. It was not black. The result therefore depends on the hidden colour in your file, and you cannot pick the fill here.
How much smaller will the JPG be?
In our test a 3,840,726 byte BMP became a 37,072 byte JPG, about 104 times smaller, and a second version of the same art became 46,431 bytes, about 83 times smaller. Your ratio depends on the picture. Photos with fine detail compress less than flat graphics.
Will the quality drop?
Yes, a little, because JPG is lossy. In our test the output matched quality 85 and the opaque areas stayed close to the source, with a peak signal-to-noise ratio of about 33 dB. Sharp edges and text are where blocky detail shows first. We did not test other quality settings.
Is the colour profile or metadata kept?
No. The BMP in our test had an embedded sRGB profile, and the JPG had no profile and no EXIF data. The pixel size stayed 1200 × 800.
Is BMP to JPG the same as BMP to JPEG?
Yes. JPG and JPEG are one format with two spellings of the extension, and you get a .jpg file either way.
Is my file kept on your servers?
The converter page states that converted files on the free tier are deleted after 24 hours. Read the page itself for the current wording before you upload anything private.
Why will my large BMP not upload?
Uncompressed BMP files are big, and a slow connection or a very large file can fail partway. We did not find a documented size limit and did not test one, so try a smaller copy or resize the image in an editor first.
When should I use PNG instead of JPG?
Use PNG when the picture has transparency, sharp text, screenshots or line art, or when you will edit it again. PNG is lossless, so nothing is approximated. Use JPG when you want the smallest file for sharing a photo.