BMP PNG

BMP to PNG Converter

Last updated: January 15, 2025

Convert BMP to PNG with lossless compression and transparency. Free browser-based converter. Keep full quality while cutting file sizes by 50–70%.

TL;DR

  • Convert BMP to PNG entirely in your browser — no upload, no sign-up, free.
  • File size reduction: 50-70% smaller
  • PNG compression: Lossless (DEFLATE)
  • Batch conversion supported; all files stay on your device.

Drag & Drop your BMP files here

or click to select files

Select BMP Files

About BMP to PNG Converter

If you have BMP files that you need to make more portable without sacrificing a single pixel of quality, converting BMP to PNG is the ideal solution. PNG uses efficient DEFLATE compression to produce files that are typically 50–70% smaller than the equivalent BMP while preserving every bit of the original image data — no quality loss whatsoever. For BMP files that include 32-bit alpha-channel transparency, PNG is a natural fit because it has native, well-supported transparency support that works consistently across all applications and platforms. BMP's transparency, by contrast, is handled inconsistently across different software. Converting BMP to PNG also modernizes your image files for the web. PNG is one of the three core image formats supported by all web browsers (alongside JPEG and GIF), while BMP is not a web format at all. Whether you are migrating a legacy image collection, preparing assets for a website redesign, or converting BMP icons and UI elements for a modern application, this tool provides fast, reliable, lossless conversion. Everything runs in your browser with no server uploads, so your images remain completely private throughout the entire process.

Key Statistics

File size reduction

50-70% smaller

PNG compression

Lossless (DEFLATE)

Transparency

8-bit alpha channel

Processing

100% client-side, no upload

BMP vs PNG Comparison

Feature BMPPNG
Pros
  • +Uncompressed and lossless
  • +Simple, well-documented format
  • +Universal Windows support
  • +No patent or licensing issues
  • +Lossless compression with no quality loss
  • +Full 8-bit alpha transparency support
  • +Universal support across all browsers and apps
  • +Ideal for editing, archiving, and print
Cons
  • −Huge file sizes (6MB+ for 1080p)
  • −No compression whatsoever
  • −Outdated and inefficient
  • −Not web-friendly
  • −Larger files than JPG, WebP, or HEIC
  • −No native animation support (APNG is the variant)
  • −Slower to encode than JPG
  • −Not optimized for photographic content

Common Use Cases

1

Modernizing legacy BMP image collections with lossless, web-compatible PNG files

2

Preserving transparency from 32-bit BMP files in a widely supported format

3

Reducing BMP file sizes by 50–70% without any quality loss

4

Preparing Windows-native BMP assets for web and cross-platform use

Frequently Asked Questions

Is BMP to PNG conversion truly lossless?
**Yes — PNG uses lossless DEFLATE compression, meaning every pixel in the BMP is preserved exactly in the PNG output with zero quality loss.** You can convert back and forth between BMP and PNG with no quality loss at any time.

How much smaller is PNG compared to BMP?
**PNG is typically 50–70% smaller than an equivalent BMP file.** Even in the worst case, PNG will be at least 20–30% smaller than BMP. The exact savings depend on image content — images with large uniform color areas compress much better.

Does PNG support the same transparency as 32-bit BMP?
**Yes — both 32-bit BMP (with alpha channel) and PNG support 8-bit alpha transparency.** Converting a 32-bit BMP to PNG preserves the full transparency data, and PNG handles transparency more consistently across applications than BMP does.

Why not convert BMP to JPG instead of PNG?
**JPG may produce smaller files for photographs without transparency, but it uses lossy compression and does not support transparency.** PNG gives you lossless quality and transparency at moderate file sizes — the best choice when quality matters more than file size.

Can I convert very large BMP files?
**Yes — our converter handles large BMP files locally in your browser with no artificial file size limits.** Very large files (over 100 MB) may take longer depending on your device's memory and processing power.

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