PNG to BMP

What is PNG?

PNG stands for Portable Network Graphics, an image format introduced in 1996 as a modern, patent-free replacement for GIF. Unlike JPG, PNG uses lossless compression, which means no image data is ever discarded — the decoded image is pixel-perfect and identical to the original. PNG also supports a full alpha channel for transparency, making it the preferred format for icons, logos, UI elements, screenshots, and any graphic that needs a transparent background. PNG is supported by every modern browser and virtually all image software. It is the ideal image format when crisp edges, text, and exact quality matter more than a small file size.

What is BMP?

BMP (Bitmap) is a raster image format developed by Microsoft for Windows and introduced in the late 1980s. A BMP file stores pixel data as an uncompressed bitmap, typically using 1-bit, 8-bit, 16-bit, 24-bit or 32-bit color depths. Because no compression is applied, BMP files are extremely large — a single 1920×1080 24-bit image is around 6 MB. BMP's simplicity made it a common interchange format inside Windows for many years, and it is still produced by scanners, screen-capture tools, point-of-sale systems and some legacy applications. Converting PNG to BMP is mainly useful when an uncompressed, pixel-perfect source is required for Windows-specific software, printing pipelines, or low-level image processing where the PNG decoder is unavailable.

PNG vs BMP comparison

PNG and BMP are both capable of lossless pixel-perfect storage, but they differ sharply in compression and file size. PNG applies lossless compression to shrink the file, while BMP stores pixels completely uncompressed. The table below summarises the key differences between PNG and BMP.

Feature	PNG	BMP
Year introduced	1996	1985 (Windows)
Compression	Lossless (DEFLATE)	None (uncompressed bitmap)
Image quality	Always pixel-perfect	Lossless, pixel-perfect
Typical file size	Small (compressed)	Very large (e.g. ~6 MB for 1920×1080)
Transparency	Supported (alpha channel)	Limited (32-bit BMP only, often ignored)
Browser support	Universal	Limited (most browsers support basic BMP)
Software compatibility	Near-universal	Good on Windows, limited elsewhere
Best for	Logos, icons, screenshots, graphics	Windows-specific interchange, scanning, pixel-level work

In short, both PNG and BMP are lossless, but PNG is dramatically smaller thanks to compression. Converting from PNG to BMP trades file size for raw, uncompressed pixel data — useful only in specific Windows or pixel-level workflows where a PNG decoder is unavailable.

When to use PNG to BMP conversion

Because BMP files are so much larger than PNG, converting PNG to BMP is only worth doing when you specifically need an uncompressed bitmap. The most common reasons to convert a PNG image to BMP are:

• Windows-specific software. Some legacy Windows applications, point-of-sale systems and industrial tools only accept BMP input and cannot decode PNG.
• Embedded systems. Certain microcontrollers, kiosks and embedded displays render raw BMP data directly without a PNG decoder.
• Printing pipelines. Certain RIP (raster image processor) software and printing workflows expect uncompressed bitmaps to avoid decode overhead.
• Pixel-level analysis. BMP stores every pixel exactly with no compression, which is useful for low-level image processing and computer vision research.
• Interchange with legacy tools. Older image editors, scientific software and CAD tools may read BMP but not PNG, making the PNG to BMP conversion a necessary bridge.
• Scanning and archival masters. If you need an exact, never-degrading copy of the decoded pixels, BMP guarantees that no further re-encoding will occur.

For everyday graphics, web publishing, icons and screenshots, keep using PNG — the file size savings are enormous and transparency is preserved. Reserve PNG to BMP conversion for the niche cases above where uncompressed pixel data is a hard requirement.

How to convert PNG to BMP

Converting a PNG image to BMP with this tool takes only a few seconds and happens entirely in your browser — no uploads, no sign-up, no watermark. The tool decodes your PNG with the browser's image engine, flattens any transparency onto a white background, and re-encodes it as an uncompressed 24-bit BMP through a manual encoder. Follow these three simple steps to convert your PNG to BMP:

1. Upload your PNG. Click the upload area above or drag and drop a .png file. Your image is previewed instantly.
2. Convert. Click the "Convert to BMP" button. The PNG is decoded, transparency is filled with white, and the result is re-encoded as an uncompressed 24-bit BMP image.
3. Download BMP. Click "Download BMP" to save the converted file to your device. Your original PNG stays untouched.

Because every step runs locally in your browser using JavaScript, your PNG image is never uploaded to a server. This makes the conversion completely private, fast, and suitable for sensitive or confidential images.