BMP to PNG Converter

Convert BMP bitmap files to PNG with lossless compression. Reduce BMP file sizes by 60–80% without any quality loss. Batch support, no upload.

Drop BMP files here

or click to select · up to 20 files · max 50 MB each

bmp

Files never leave your device — processed locally in your browser

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What it does

60–80% smaller files

BMP stores uncompressed raw pixels. PNG's lossless compression reduces the same image to 20–40% of the BMP size.

Lossless quality

PNG is lossless — every pixel is preserved exactly. No quality trade-off, just dramatically smaller files.

Batch processing

Convert up to 20 BMP files at once and download all as a ZIP.

Wide BMP support

Handles all common BMP variants: 1-bit, 4-bit, 8-bit, 16-bit, 24-bit, and 32-bit.

How to use BMP to PNG Converter

  1. 1
    Upload BMP files

    Drop .bmp files onto the zone or click to browse.

  2. 2
    Convert

    Click "Convert to PNG". No options needed — BMP to PNG is a simple lossless recompression.

  3. 3
    Download

    Download individual PNGs or all as a ZIP.

When to use this

Compressing Windows screenshots

Windows Paint saves in BMP by default. Convert to PNG to save 70–80% storage space with zero quality loss.

Web publishing

BMP is not supported in web browsers. Convert BMP artwork or diagrams to PNG for web use.

Reducing legacy scan files

Older scanners and software often save in BMP. Convert to PNG to reduce file sizes before archiving or sharing.

Common errors & fixes

BMP file not recognized
Ensure the file has a .bmp extension. Some bitmap files may be saved with incorrect extensions. Try renaming to .bmp.
Colors look wrong in PNG output
Very old BMP files use indexed color (8-bit palette). This converter handles these automatically, but if colors appear incorrect, the BMP may use an unusual color space.

Technical details

Input formatBMP (all variants: 1, 4, 8, 16, 24, 32-bit)
Output formatPNG (lossless, 24-bit or 32-bit with alpha)
Typical size reduction60–80% vs original BMP
Encoding methodcreateImageBitmap() + Canvas toBlob("image/png")
Processing locationBrowser (client-side only)

What is BMP?

BMP (Bitmap) is a raster image format native to Microsoft Windows, dating back to the 1980s. BMP stores pixel data with no compression by default — a 1920×1080 24-bit BMP file is approximately 5.9 MB, while the same image saved as PNG compresses to about 1.2–2 MB without any quality loss.

BMP was useful in the early days of Windows when CPU overhead for compression was significant. Today it is a legacy format with no technical advantages over PNG. It is not supported by web browsers and is rarely used in modern workflows.

Why convert BMP to PNG?

Converting BMP to PNG gives you the same pixel-perfect image at 20–40% of the original file size. The conversion is lossless — every pixel value is preserved exactly. PNG is also universally supported in all browsers, email clients, image editors, and design tools, while BMP is browser-incompatible and space-inefficient.

There is no reason to keep files in BMP format for any modern use case. PNG provides all the same benefits (lossless, true-color, transparency) at a fraction of the file size.

BMP vs PNG: Technical comparison

BMP and PNG both store lossless raster images, but their compression differs fundamentally. BMP stores raw pixel data with no compression (in most variants). PNG uses DEFLATE compression, which typically reduces a 24-bit image to 20–40% of its uncompressed size.

For a 1920×1080 image: - BMP (24-bit): ~6 MB - PNG (typical photo): ~2–3 MB - PNG (simple graphics/screenshots): ~100–500 KB

PNG also adds metadata support, gamma correction, and optional transparency — none of which BMP handles well.

Frequently Asked Questions

What is a BMP file?

BMP (Bitmap) is an uncompressed image format native to Windows. BMP files store raw pixel data with no compression, making them very large compared to PNG or JPEG.

How do I convert BMP to PNG?

Upload your BMP files using the drop zone above and click "Convert to PNG". PNG uses lossless compression to reduce the file size by 60–80%.

Is this BMP to PNG converter free?

Yes, completely free.

Does the converter upload my BMP files?

No. Conversion happens entirely in your browser.

Can I batch convert multiple BMP files?

Yes, up to 20 files at once with ZIP download.

Is there any quality loss when converting BMP to PNG?

No. PNG is lossless. The output PNG contains exactly the same pixel data as the input BMP.

How much smaller will the PNG be?

Typically 60–80% smaller than the BMP. Simple graphics (few colors, large flat areas) compress more than photographs.

Does it work offline?

Yes, after the first page load the conversion works without internet.

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