Convert BMP to PNG online for free. Fast, private, no signup, no watermark — high-quality BMP-to-PNG conversion in your browser.
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Checking files and selected output formats.
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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.
PNG is lossless and supports transparency — the two things JPG can't do. Screenshots, UI mockups, logos, icons, diagrams, and anything with sharp edges or text should be PNG. File sizes are larger than JPG for photographic content (usually 2-5×), so PNG is a bad choice for photographs unless you specifically need lossless. Note: PNG has no metadata for camera EXIF, so converting a photo JPG → PNG loses the camera info.
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.
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 (Bitmap Image File) is a raster image format developed by Microsoft, dating back to 1986. It stores pixel data with little to no compression — each pixel's colour value is written directly into the file, resulting in a faithful but very large representation of the image. While BMP can optionally use RLE (Run-Length Encoding) compression, this is rarely applied in practice, and the format is primarily associated with uncompressed image storage.
BMP is rarely used today for general-purpose imaging due to its extremely large file sizes compared to modern alternatives like PNG or WebP. Its primary remaining use cases are in Windows system resources, legacy desktop applications, and scenarios where raw, uncompressed pixel data is required for processing. BMP offers limited transparency support and no features like animation or metadata. For virtually all modern workflows — web, mobile, print, or archival — other formats provide better compression, features, and compatibility.
Quick answers about compatibility, quality, metadata handling, and the most common reasons to convert BMP files to PNG.
Read image-format guides, transparency tips, compatibility fixes, and file-size advice related to BMP to PNG Converter.
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