BMP to PNG converter

Turn BMP images into PNG files right in your browser. Pick the quality, decide what replaces transparent areas, and download one file or a whole batch. Nothing is uploaded.

  • Free
  • No sign-up
  • Runs in your browser
bmp-to-png
Options
Background for transparent areas
JPG has no transparency, so transparent areas are filled with this color.

100% private — your images are converted on your device and are never uploaded to any server.

Works with images up to about 60 MB each. Animated GIFs are converted using their first frame only.

Next step

Keep going with your result in another tool. Nothing is uploaded.

How it works

Add your BMP files

Drop them on the box or choose them from your device. You can add several at once.

Set quality and background

PNG quality is adjustable, and you can pick the color that fills any transparent area.

Convert and download

Each file converts on your device and you can download them one by one or all together as a ZIP.

How to convert BMP to PNG

To convert BMP to PNG, drop your BMP files on the box above, choose the output quality and download the result. The conversion happens inside your browser, so the files never leave your device, and it is free with no sign-up.

What BMP and PNG are

BMP is an old uncompressed Windows format. It keeps every pixel untouched but is enormous: a 12-megapixel photo takes about 36 MB.

PNG is a lossless format: every pixel is stored exactly, so text, logos and screenshots stay razor sharp, and it supports full transparency. The price is size, since a photo saved as PNG is often three to ten times bigger than the same photo as JPG.

Why convert BMP to PNG

BMP to PNG shrinks a bulky file without giving up a single pixel. PNG compresses losslessly, so screenshots, scans, diagrams and old Windows graphics keep their exact appearance while taking a fraction of the space.

What changes when you convert BMP to PNG

  • The file gets much smaller and nothing is lost. PNG uses lossless compression, so the picture is pixel for pixel identical to the BMP.
  • Graphics compress best. Flat colors, text and diagrams can shrink by 90 percent or more; photographs shrink less.
  • Compatibility improves. PNG is supported by browsers, editors and upload forms that ignore BMP.

Tips for the best result

  • If the BMP is a photograph and size matters more than exactness, JPG will be smaller still.
  • Use PNG for screenshots and drawings; it keeps text and lines crisp.
  • Batch-convert a whole folder at once to save time; each file is handled separately.

Private by design

The conversion runs entirely in your browser using your device's own image engine. Your BMP files are never uploaded to a server, so personal photos, documents and unpublished designs stay with you, and there is no queue and no size limit imposed by an upload.

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Frequently asked questions

Does BMP to PNG lose quality?
No. PNG is lossless, so the converted image is identical pixel for pixel to the BMP; the only change is that it is stored in a compressed way.
How much smaller will the PNG be?
It depends on the content. Screenshots and graphics often drop by 90 percent or more, while detailed photographs typically shrink by half to two thirds.
Is this BMP to PNG converter free?
Yes, completely. There is no sign-up, no watermark and no limit on the number of files. The tool runs in your browser, so it costs us nothing to let you use it as much as you like.
Are my images uploaded anywhere?
No. The conversion is done on your own device with your browser's image engine. Nothing is sent to a server, which also makes it fast and safe for private pictures.
Can I convert several BMP files at once?
Yes. Add as many as you like; each one is converted separately and you can download them individually or all together in a ZIP file.
Does it work on a phone?
Yes. It runs in any modern mobile browser on iPhone and Android. Very large images can be slow on older phones because your device does the work.

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