BMP to JPG converter
Drop in BMP bitmaps and download small JPG files. The conversion runs in your browser.
Free · no signup Runs in your browser
How do I convert BMP to JPG?
Add your BMP files, choose a quality (90 works well) and download the JPG versions. A BMP stores every pixel without compression, so a photograph can take many megabytes; as a JPG the same picture is usually a small fraction of the size. Your browser does the conversion, so nothing is uploaded.
Why convert BMP to JPG
BMP is one of the oldest picture formats, still produced by some old programs, scanners, screen-capture tools and embedded devices. It stores every pixel exactly and uses no compression, which makes files very large and unwelcome on websites, in email and on upload forms.
JPG compresses photographs by discarding detail the eye is least likely to miss, so conversion shrinks a BMP dramatically. For a screenshot with sharp text or a diagram, PNG is a better target than JPG because it keeps edges crisp and is also much smaller than a BMP. Use the PNG converters for that.
It runs in your browser. Your pictures are never uploaded, and there is no account to make.
How the conversion works in detail
Your browser does the work. When you add a BMP file, the page reads it with the browser's File API (the file is not uploaded), asks the browser to decode it into raw pixels, and draws those pixels on a canvas of the same size. The canvas is then saved as JPG (JPEG) with the browser's own encoder, and the result is offered as a download. A BMP file is the old Windows bitmap format: it stores the pixels with little or no compression; a JPG file is the most common photo format: it stores each picture as a compressed, lossy approximation of the original, with no transparency. Because JPG has no transparency, any see-through area is first filled with the background colour you choose (white by default), and the quality slider sets how much detail is traded for a smaller file. Everything is processed one picture at a time, in your browser's memory, which is why several pictures at once work well but pictures over about 100 megapixels are refused.
How to convert, step by step
- Add your BMP files: drop them on the box, press the box to choose them, or paste a picture.
- Choose the background colour and quality (JPG is lossy: 90 is a good balance, 100 is the largest and 70 is noticeably smaller).
- Wait a moment: each picture shows its new size and how much smaller or larger the file became.
- Press Download next to one picture, or Download all to save every converted file in turn.
- Open a converted file to check it before you delete the original BMP file.
What changes in the conversion
What stays the same and what does not when BMP becomes JPG.
| Aspect | What happens |
|---|---|
| Pixels and size in pixels | Kept exactly: the width and height do not change |
| File size | Much smaller: BMP is uncompressed |
| Quality | A small loss: JPG is lossy, so each conversion discards a little detail. Keep the original |
| Transparency | Not applicable: BMP has no transparency |
| Animation | Not applicable: BMP is a single picture |
| Camera details, date and GPS location | Removed. A canvas holds only pixels, so the new file carries none of the original's metadata, which also helps privacy |
| Orientation | Applied: a photo that was rotated by a camera setting is turned upright in the new file |
| Colours | Converted to the standard sRGB range. Pictures with a wider colour range (some AVIF, HEIC and WebP files) may look a touch less saturated |
When to use it
- Shrinking old bitmap pictures for email or the web
- Uploading a scan that was saved as BMP
- Freeing disk space
- Meeting a form that accepts only JPG
Problems you may run into
Most problems come from the formats involved, not from the tool.
| What you see | Likely cause | What to do |
|---|---|---|
| A BMP file will not open or shows an error | The file is damaged, is not really BMP (it was only renamed), or your browser cannot decode it | Open the file in another program to check it, or try Chrome, Edge or Firefox |
| The result looks softer or has fuzzy edges | JPG is lossy, and text or sharp lines show compression most | Raise the quality to 95 to 100, or use PNG for screenshots and text |
| The JPG is far smaller than the BMP | BMP is uncompressed | That is expected and is the reason to convert |
| Colours look a little different | The picture was converted to the standard sRGB range | Compare at full size; for colour-critical work convert in a colour-managed editor |
| The camera date or GPS location is gone | Metadata is not copied, by design | Keep the original if you need it, or write the details in the file name |
| 'Too large to process' | The picture is above about 100 megapixels | Reduce it first with the image resizer |
| Several downloads are blocked | The browser asks before saving many files at once | Allow multiple downloads for this site, or download the pictures one by one |
Mistakes it helps you avoid
- Using JPG for a screenshot of text: PNG is sharper.
- Converting repeatedly: keep the BMP original.
- Choosing a very low quality.
- Forgetting that BMP has no compression to speak of: the saving is large, so check the result.
How the conversion works
Four steps, all inside your browser.
1. The file you choose is read by your browser. It is not sent to a server.2. The picture is decoded to pixels and drawn on a canvas the same size as the original.3. The canvas is saved in the new format, at the quality you set for JPG.4. The new file is offered as a download. Metadata such as camera details and location is not carried over.
Browsers decode the picture to pixels and re-encode a canvas with the format and quality you choose (MDN: HTMLCanvasElement.toBlob). Because the picture is redrawn, camera details and location data are not copied to the new file, and an animated picture keeps only its first frame. Pictures over about 100 megapixels are refused, since many phones cannot hold them in memory.
Example: scan.bmp to scan.jpg
You have scan.bmp and need a JPG file.
- You choosescan.bmp
- You getscan.jpg
- SettingQuality 90
A JPG that is usually many times smaller than the BMP.
Sizes depend on the picture, so this tool shows the before and after size for each file instead of promising a percentage.
Terms on this page
- Lossy
- A format that discards some detail to make the file smaller, such as JPG.
- Lossless
- A format that stores the pixels without losing detail, such as PNG.
Common questions
Why are BMP files so big?
BMP stores every pixel without compression, so the file size grows with the number of pixels.
Will I lose quality?
A little, because JPG is lossy. A quality of 90 or higher keeps most detail.
Should I use PNG instead?
For screenshots, diagrams and text, yes. PNG is lossless and also much smaller than BMP.
Is my file uploaded?
No. The conversion happens in your browser.
Can I convert many files at once?
Yes. Add several and download each one, or use Download all.
Where these numbers come from
- MDN Web Docs — HTMLCanvasElement.toBlob() How a browser encodes a canvas as PNG, JPEG or WebP, and what the quality argument does.
- MDN Web Docs — Using files from web applications How a page reads a file you choose without uploading it.
- MDN Web Docs — Image file type and format guide Which formats are lossy or lossless, which support transparency, and where they are best used.
Last verified 2026-10-25 The method on this page is checked against the sources above at least once a year. Spotted something out of date? Tell us and we will fix it.
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