BMP to PNG Converter

Convert BMP to PNG online for free. Fast, private, no signup, no watermark — high-quality BMP-to-PNG conversion.

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What to expect when converting BMP to PNG

Typical file-size change

50–90% smaller (typically)

Example

A 20 MB BMP typically becomes 2 – 10 MB as PNG.

Quality: None — both lossless. PNG preserves every pixel from the BMP exactly, just with efficient compression.

Best for: modernizing legacy BMP images while preserving full quality.

Avoid when: rare — PNG is strictly better than BMP for almost every use case.

Tip: BMP→PNG is one of the safest conversions: lossless, smaller, broader compatibility, supports transparency.

BMP to PNG: lossless compression of raw pixels

BMP stores raw uncompressed pixels while PNG applies lossless DEFLATE compression with prediction filters. The conversion reads the BMP pixel array, applies PNG's row-level prediction filters (Sub, Up, Average, Paeth) that exploit spatial redundancy, then DEFLATE-compresses the filtered data. The result is typically 50-80% smaller than the BMP with zero quality loss — every pixel is preserved bit-for-bit.

Convert BMP to PNG when you want to reduce file size without any quality loss. This is the right choice for screenshots, diagrams, text images, and any content where lossy JPG compression would produce visible artifacts. PNG is universally supported across all modern platforms and browsers.

BMP vs PNG: Side-by-side

Technical comparison of the two formats — useful for deciding which to use, or for confirming what changes during conversion.

Property	BMP	PNG
Full name	Bitmap	Portable Network Graphics
Year introduced	1990	1996
Developer / standard body	Microsoft	PNG Development Group / W3C
MIME type	image/bmp	image/png
File extension	.bmp	.png
Compression	Uncompressed (typically)	Lossless (DEFLATE)
Color / data depth	1 to 32-bit	24-bit truecolor + 8-bit alpha
Max dimensions / size	32,767 × 32,767 px	2,147,483,647 × 2,147,483,647 px
Transparency	Yes	Yes
Animation	No	APNG extension only
Standard / specification	Microsoft Windows	W3C / ISO/IEC 15948
Best for	Legacy Windows applications, raw pixel data	Logos, screenshots, graphics with transparency or sharp edges

BMP to PNG FAQ

Quick answers about compatibility, quality, metadata handling, and the most common reasons to convert BMP files to PNG.

How do I convert BMP to PNG?

Upload your BMP image to iFormat and click Convert — it's decoded and re-encoded to PNG in seconds. It's free, adds no watermark, and needs no account. Batch upload is supported, and results download individually or as a ZIP.

Can I convert BMP to PNG without losing quality?

PNG is a lossless format with transparency support. Converting to a lossless target such as PNG, TIFF or BMP preserves every pixel exactly. Converting to a lossy one such as JPG or WebP re-encodes the image, and iFormat uses a high default quality so the difference is invisible at normal viewing size. For the sharpest result, always convert from the highest-quality source you have.

What is BMP?

BMP is an uncompressed Windows bitmap, typically used for raw pixel data with no compression. Converting it to PNG makes the file easier to open, share, or upload where BMP is not supported.

BMP vs PNG — which format should I use?

BMP is an uncompressed Windows bitmap best for raw pixel data with no compression. PNG is a lossless format with transparency support best for logos, screenshots, and graphics with sharp edges. Use PNG when a website, form, or app requires it, or when you need PNG's specific strengths like smaller file size, wider compatibility, or transparency support.

How do I open BMP files?

On Windows: Photos, or Paint. On a Mac: Preview. Opens everywhere but is uncompressed, so files are enormous for what they contain.

Is PNG better than BMP?

Yes, in almost every way. PNG is lossless (like BMP) but uses compression, so files are 50–80% smaller. PNG also supports transparency and is universally supported by web browsers. BMP has no advantages over PNG in modern use.

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