PNG to BMP converter
Convert PNG images to BMP in your browser.
Processed in your browser. This file is converted on your device and is never uploaded.
Converter
.png up to 50 MB. You can also drag a file here.
No file selected.
About this tool
PNG is what screenshots, logos, and exported graphics are usually saved as. BMP is uncompressed and trivially simple, which is occasionally what a piece of legacy software insists on.
This tool converts PNG to BMP entirely in your browser. The image is decoded, drawn, and re-encoded on your device, so nothing is uploaded and the size of the file costs you no waiting.
Supported formats and limits
- Input
- .png
- Output
- .bmp (image/bmp)
- Output name
- The original name with the new extension, for example photo.png becomes photo.bmp.
- File size limit
- 50 MB
- Processing
- In your browser. The file is not uploaded.
PNG against BMP
| Feature | PNG | BMP |
|---|---|---|
| Compression | Lossless | None, stored as written |
| Colour | 8 bits per channel | 8 bits per channel |
| Transparency | Full alpha channel | None |
| Animation | No | No |
| Keeps EXIF | Yes | No |
| Browser support | Every browser since 1997 | Every browser since 1995 |
| Size of a photograph | 3 to 5 times a JPG | 8 to 20 times a JPG |
| Published | 1996 | 1990 |
How to use it
- Choose a .png file, or drag one onto the page.
- Choose the colour that replaces any transparency.
- Optionally set a width or height to resize at the same time.
- Select Convert, then download the BMP file.
Limitations
- The output is uncompressed 24-bit BMP, so the file is large: roughly three bytes per pixel regardless of the picture.
- 24-bit BMP has no transparency, so transparent areas are filled with the background colour you choose.
- Metadata is not preserved. EXIF fields, including camera settings and GPS location, are dropped, which is a privacy benefit but worth knowing if you rely on them.
- Colour profiles are not preserved, so an image in a wide-gamut profile may shift slightly.
- The camera's EXIF orientation is applied, so a photo taken sideways comes out upright rather than rotated.
Common problems
The transparent background came out black or white
BMP has no alpha channel, so there is nowhere to record that a pixel was see-through. Every transparent pixel in your PNG has to become some actual colour.
Set the background colour before converting, so the flattening happens against the colour you want rather than a default. If the transparency has to survive, convert to WebP instead of BMP.
The BMP file is larger than the PNG you started with
A photograph stored as BMP runs about 8 to 20 times the size of the same picture as JPG, against 3 to 5 for PNG. That is not a fault in the conversion; it is what the two formats do.
If size is what matters, AVIF is the smaller of the options here. If you needed BMP for a reason, resizing the image first is the one lever that always works.
The camera settings and GPS location are gone from the BMP
PNG carries an EXIF block and this conversion does not move it across. The image is decoded to pixels, drawn, and encoded again as BMP, and the metadata does not survive that round trip.
Keep the original PNG if you need those fields. If you were converting in order to strip location data before publishing, this is the behaviour you wanted.
Other ways to do this
The program already on your computer
Paint on Windows, Preview on macOS, GIMP will open a PNG and save it as BMP, and if you have one of them installed and only one file to convert, that is a perfectly good answer. It stays on your machine the same way this does. Where it stops being convenient is a folder of forty files, or a machine you do not own.
ImageMagick, from a terminal
One command converts a directory: magick mogrify -format BMP *.PNG. If you already have it installed this is the fastest way to do a hundred files, and it scripts. It is also a dependency to install and a syntax to learn, which is a poor trade for converting one image once.
An online converter that uploads
Most sites offering this send your file to a server, convert it there, and give you a link back. They can do formats a browser cannot, which is a real advantage. The cost is that your file was on somebody else's machine, governed by a retention policy you did not read. That is the whole difference here: this page converts PNG to BMP using code your browser already downloaded, so there is no server holding it afterwards.
Frequently asked questions
- Is my image uploaded?
- No. The conversion runs entirely in your browser. The image never leaves your device and no request carrying it is made.
- What happens to transparent areas?
- BMP cannot store transparency, so transparent and semi-transparent pixels are composited onto the background colour before encoding. The default is white.
- Does converting to BMP lose any quality?
- The conversion itself does not. BMP is lossless, so every pixel it is handed is written exactly as it arrived and nothing is discarded on the way. What it cannot do is recover detail your PNG had already lost before it got here: a lossless format preserves what it is given, it does not restore what is gone.
- Will the BMP be bigger or smaller than the PNG?
- Smaller or larger depending on the pair, and here the arithmetic is public: a photograph as PNG runs 3 to 5 times the size of the same picture as JPG, and as BMP it runs 8 to 20. The comparison table above states both, so you can tell before converting rather than after.
- Can I resize while converting?
- Yes. Set a width, a height, or both. With proportions kept, one dimension is derived from the other, and giving both fits the image inside that box rather than distorting it.
- Do I need to install anything or create an account to use PNG to BMP converter?
- No, to all of it. PNG to BMP converter runs inside the browser you already have, with no sign-up, no download, no watermark on the result, and no cap on how many files you convert. There is nothing to uninstall afterwards either, because nothing was installed.
- Does PNG to BMP converter work offline?
- Once the page has loaded, yes. The conversion runs on your device, so it needs no connection to do the work. The first visit fetches the page and the code that does the converting; after that a lost connection stops nothing, and a converted file appears exactly as it would online.
- How large a file can PNG to BMP converter handle?
- The limit is 50 MB. It is a deliberate one rather than a technical ceiling: the real constraint is memory, and a file that decodes to more than the device can hold fails in a way that is hard to explain. Phones run out well before laptops do, which is why the limit is set where it is.
- Can I convert several files at once with PNG to BMP converter?
- Not here: this tool takes one file at a time, because what it does depends on choices you make about that particular file. Convert them one after another, or look at the batch converters in the same category, which are built for a folder at a time.