Image
Convert BMP to PNG
Free, private, and instant — your files never leave your device.
BMP (Windows Bitmap) stores pixels with no compression whatsoever — every pixel is written as raw bytes, making BMP files enormous. A single 1920×1080 BMP occupies around 6 megabytes; the same image as a PNG is typically under 1 megabyte. PNG uses lossless compression, meaning it shrinks the file without discarding a single pixel — the output is mathematically identical to the input. Converting BMP to PNG is almost always the correct choice: you get a file 5–10× smaller, pixel-perfect quality, and a format that works in every image viewer, browser, and editor on the planet.
BMP
Windows Bitmap
- Lossless compression
- Supports transparency
- Best for: Windows system resources, uncompressed raw pixel exports
PNG
Portable Network Graphics
- Lossless compression
- Supports transparency
- Best for: screenshots, logos, graphics with transparency, diagrams
How to Use
- 1
Drop your BMP file — the output format is already set to PNG.
- 2
No quality settings needed: PNG is lossless, so there is nothing to configure.
- 3
Click "Convert to PNG" — conversion runs entirely in your browser.
- 4
Download the PNG. Expect a file 5–10× smaller than the original BMP with identical quality.
Frequently Asked Questions
How much smaller will the PNG be compared to the BMP?
Typically 5–10× smaller for photographic content, and often 10–20× smaller for screenshots, diagrams, and flat-color graphics that compress especially well under PNG's DEFLATE algorithm.
Is any quality lost when converting BMP to PNG?
No. PNG uses lossless compression — it reconstructs the pixel data exactly. The output PNG is bit-for-bit identical to the source BMP in terms of image content.
Why is BMP so large in the first place?
BMP stores each pixel as raw RGB bytes with no compression at all. A 24-bit BMP at 1920×1080 requires 1,920 × 1,080 × 3 bytes ≈ 6 MB. PNG applies lossless DEFLATE compression that removes redundancy without losing any information.
Is PNG supported everywhere BMP is?
More so, yes. PNG is universally supported across all browsers, image editors, CMS platforms, and operating systems. BMP is largely a Windows-specific legacy format with limited support outside Microsoft software.