BMP to JPG Converter
You have a BMP that came from an old scanner, a Windows screenshot tool or legacy software, and it is far too heavy to send or upload. JPG is the usual answer for photographs. Drop the bitmap here, choose a quality, and get a JPG without the file ever leaving your device.
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How to convert BMP to JPG
- Add your BMP files by dropping them, clicking the drop zone or pasting.
- The output format is already set to JPG. Adjust quality or size if you need to.
- Press Convert and compare the original and new size for each file.
- Download each file or all of them as a ZIP.
When to convert, and when not to
- The BMP is a photograph or scan and you want something small enough for e-mail or a web form.
- A website, app or printer rejects BMP but accepts JPG.
- You keep an archive of old bitmaps and want a smaller copy next to the original.
- Do not convert if the BMP holds sharp text, line art or a screenshot you still want to edit; JPG blurs hard edges. PNG is the better target there.
What changes
- BMP stores pixels without compression, while JPG is lossy, so some fine detail is discarded for a smaller file.
- The quality slider controls the trade-off. Higher values keep more detail and produce a larger file.
- This converter writes 24-bit colour only, and JPG has no transparency, so any see-through areas are filled with the background colour you pick (white by default).
- Phone-style rotation data is applied before conversion, and other metadata is not carried over.
- Resize by percent or maximum width and height if you also need fewer pixels.
Why bitmaps get so large
A BMP file records the colour of every pixel one after another. There is no clever packing, which makes the format simple for programs to read and write but wasteful for storage. A picture that looks the same as a JPG on screen can take up many times more space as a bitmap, and that difference is exactly why people search for a way to change the format.
JPG works differently. It splits the image into small blocks and keeps the information the eye notices most, throwing away detail that is hard to see. That is a good deal for photographs, where colours change smoothly, and a poor deal for flat graphics with crisp edges.
Choosing a quality for your bitmap
Start with the default quality, convert one file, and look at the result at full size. If you see blocky patches around text or edges, raise the slider and convert again. If the picture looks fine, you can try a lower value to save more space.
The only reliable way to know how much smaller your file becomes is to convert it. The queue shows the original size next to the new size for every file, so run a few of your own bitmaps and compare before you convert the whole folder.
Keep the original BMP until you are happy. JPG is a one-way trade: converting back to BMP will not restore the detail that was removed.
Converting many bitmaps at once
Drop a whole folder of BMP files in one go. They are converted one after another, which keeps memory use low on phones and older laptops, and you can download them individually or all together as a ZIP. Everything runs inside your browser tab, so even private scans stay on your machine.
Photographs from older cameras, flatbed scanners and screen-capture programs often arrive as bitmaps. If you are tidying such a collection, convert a representative sample first, check the results on the device where you will normally view them, and only then process the rest. That small step catches quality settings that are too aggressive before they affect hundreds of files.
Privacy: your files stay on your device
- The tool decodes, resizes and encodes your pictures with your browser. The files are never sent to a server.
- To check it yourself: open the browser developer tools (F12), open the Network tab, convert a file, and look for any request that carries your image. You will see none.
Frequently asked questions
Will my BMP lose quality as a JPG?
Yes, a little. JPG is lossy. At a high quality setting the change is usually hard to notice for photographs, but compare the result with your original before deleting anything.
Why does my JPG have a white background?
JPG cannot store transparency. Any see-through area is filled with the background colour you choose in the options, which is white unless you change it.
Can I convert dozens of BMP files together?
Yes. They are processed one by one and you can download a ZIP of the results. Very large bitmaps may be slow on a phone, so convert a few at a time there.
My BMP will not open at all. What now?
Some unusual BMP variants are not read by every browser. Try opening the file in a paint program, saving it again as a standard BMP or PNG, and converting that copy.