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BMP to PNG converter

Uncompressed Windows bitmaps, losslessly compressed — usually several times smaller and pixel-for-pixel identical.

  • Free, no signup
  • Runs in your browser
  • Nothing uploaded
  • PNG is lossless and so is BMP, so there is no quality dial for this conversion and nothing to lose.
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Why this conversion

When BMP to PNG is the right move

BMP stores raw pixels with essentially no compression. That is why a 1920×1080 bitmap weighs about six megabytes every single time, whether it contains a photograph or a blank white rectangle — the size is a function of the dimensions alone, not the content.

Read more

PNG stores exactly the same pixels, losslessly, with real compression applied. This is the rare conversion with no trade-off worth arguing about: the image that comes out is bit-for-bit the same picture, in a file a fraction of the size, in a format everything opens.

Reach for it when
  • Anything produced by Paint, an older scanner, a Windows screen capture or an industrial camera.
  • You need the pixels preserved exactly and cannot accept lossy compression.
  • A BMP is too large to email or commit to a repository.
The trade-off

What you gain and lose going BMP to PNG

Nothing is lost

Both formats are lossless. The PNG contains precisely the pixels the BMP did — this is a re-packaging, not a re-encoding.

The saving depends entirely on content

Flat, repetitive images — screenshots, diagrams, scanned documents — can shrink by ten times or more. Noisy photographs compress less, though still substantially.

PNG is accepted where BMP is not

Web pages, chat apps and modern upload forms handle PNG as a matter of course. BMP is treated as a legacy desktop format almost everywhere outside Windows.

How it works

Converting BMP to PNG, step by step

  1. 1

    Choose your BMP file

    Browse or drop it onto the panel. Up to 25 MB. The file is decoded by your browser and is never uploaded anywhere.

  2. 2

    PNG is already selected

    The target is preset to PNG for this conversion. Only formats your browser can genuinely encode are offered, so nothing hands you a renamed PNG.

  3. 3

    Nothing to tune

    PNG is lossless, so there is no quality dial and no background to choose. What your browser decoded is exactly what gets written.

  4. 4

    Compare, then download

    Original size, converted size and the percentage difference are all shown before you commit — including the cases where converting makes the file bigger.

BMP to PNG questions

Pick a question to see the answer.

  • None. Both formats are lossless, so the PNG holds exactly the pixels the BMP held. The file is smaller purely because PNG applies compression and BMP applies almost none.

  • It depends on the content, because PNG compression is content-aware. Screenshots, diagrams and scanned text often drop by a factor of ten; detailed photographs typically by two to four.

  • The format was designed for direct memory-mapping on early Windows, so it stores each pixel literally with no compression stage. Size is determined by width × height × colour depth and nothing else.

Related conversions

Other formats, same converter

BMP to JPEG

Take a raw bitmap from megabytes to kilobytes.

BMP to WebP

Take a legacy bitmap straight to the format the web actually wants.

PNG to WebP

Cut a screenshot or logo down to a fraction of its size without losing the alpha channel.

Every format in one tool

The general image converter, with all the formats your browser can write and the same size comparison before you download.

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