FormatDrop
How-To Guide

How to Convert BMP to PNG

PNG is a strictly better format than BMP for virtually all use cases — it's losslessly compressed (no quality loss), much smaller in file size (5-10x smaller for typical images), and universally supported everywhere BMP is. Converting BMP to PNG is always worthwhile.

Open BMP to PNG Converter

Step-by-step instructions

  1. 1

    Method 1: macOS Preview (Mac)

    Open BMP in Preview → File → Export → Format: PNG → Save. PNG compression is lossless — zero quality change. The PNG will be 50-90% smaller than the original BMP.

    Go to converter
  2. 2

    Method 2: Microsoft Paint (Windows)

    Open BMP in Paint → File → Save As → PNG Picture. Quick and simple for single files on Windows.

  3. 3

    Method 3: Browser converter

    Go to formatdrop.com → Image Converter. Drop your BMP. Select PNG output. Download. The PNG preserves exact pixel data — no quality loss.

  4. 4

    Method 4: FFmpeg (batch)

    Single file: ffmpeg -i input.bmp output.png. Batch convert: for f in *.bmp; do ffmpeg -i "$f" "${f%.bmp}.png"; done (Linux/Mac). Windows: for %f in (*.bmp) do ffmpeg -i "%f" "%~nf.png"

Why convert BMP to PNG?

BMP stores uncompressed image data — every pixel stored without any compression. PNG uses lossless DEFLATE compression that typically reduces the file to 10-30% of the BMP size for photographic images, and even less for images with large areas of flat colour (like screenshots and diagrams). Converting BMP to PNG is always lossless — not a single pixel changes. The only downside: slightly slower to save and load than BMP (but modern hardware makes this irrelevant).

Your files never leave your device

FormatDrop runs the conversion engine entirely inside your browser using WebAssembly. No file upload. No server. Nothing stored. You can verify this by opening DevTools → Network tab and watching: zero upload requests.

Frequently asked questions

Is BMP to PNG conversion lossless?
Yes, completely. PNG uses lossless compression — the decompressed PNG data is bit-for-bit identical to the BMP data. Every pixel is perfectly preserved. No compression artifacts, no quality changes — only the file size changes (smaller).
When would I keep BMP instead of converting to PNG?
Almost never for modern workflows. Historical exceptions: some Windows system internals use BMP. Some very old printing or industrial equipment requires BMP. Windows wallpapers were historically BMP (but even Windows now accepts PNG/JPEG wallpapers). For any normal use: PNG is always better than BMP.
Convert BMP to PNG Now — Free

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