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Convert PNG to BMP Online Free — Fast Batch Conversion
How to Convert Images Online
1Upload your PNG
Click the upload button or drag and drop your PNG file. Upload up to 10 files for batch conversion.
2Choose BMP output
BMP is selected by default on this page. Adjust quality settings if needed.
3Download
Click Convert and download your BMP file. For multiple files you get a ZIP archive.
Supported Image Formats
PNG
Lossless format that preserves every pixel. Best for screenshots and logos.
BMP
Uncompressed bitmap format. Maximum quality but very large file size.
HEIC
Apple photo format used by iPhone and iPad. High quality with small file size.
HEIF
High Efficiency Image Format — same as HEIC, used on Apple devices.
WebP
Modern image format by Google. Up to 30% smaller than JPG with the same quality.
JPG
Universal format for photos. Supported everywhere, great balance between quality and file size.
GIF
Classic format for simple animations. Supports transparency and up to 256 colors.
TIFF
Professional lossless format used in printing and photography.
AVIF
Next-gen format with excellent compression. Up to 50% smaller than JPG.
PPM
Portable Pixmap format used in Unix/Linux environments.
HDR
High Dynamic Range format storing extended brightness data.
FITS
Flexible Image Transport System used in astronomy and science.
PDF
Portable Document Format. Convert PDF pages to JPG, PNG or WebP images.
AVIF vs WebP vs HEIC vs JPG
Quick comparison to help you choose the right format
AVIF
- Size: Up to 50% smaller than JPG
- Browsers: Chrome, Firefox, Safari
- Transparency: ✓
- Best for: Web performance
WebP
- Size: 25-35% smaller than JPG
- Browsers: All modern browsers
- Transparency: ✓
- Best for: Web compatibility
HEIC
- Size: ~50% smaller than JPG
- Browsers: Safari only
- Transparency: ✓
- Best for: iPhone storage
JPG
- Size: Baseline
- Browsers: All browsers & apps
- Transparency: ✗
- Best for: Universal sharing
Frequently Asked Questions
- Does converting PNG to BMP lose quality?
- No — both formats are lossless. Every pixel value is preserved exactly, unless the PNG uses 16-bit color depth (which is quantized to 8-bit in BMP) or transparency is composited onto a background for 24-bit output.
- Why is the BMP so much larger than the PNG?
- PNG uses DEFLATE compression to reduce file size by 3–21× depending on content. BMP stores raw uncompressed pixels. A 500 KB PNG screenshot becomes a 5.93 MB BMP at 1080p — the pixel data is identical, only the storage method differs.
- What happens to PNG transparency in BMP?
- In 24-bit BMP (default), transparent pixels are composited onto a white background. In 32-bit BMP with V5 header, the full alpha channel is preserved. Many legacy tools only support 24-bit, so check your downstream requirements.
- Can I batch convert PNG to BMP?
- Yes. Convertify accepts up to 10 files per batch and delivers them as a ZIP archive.
- Is BMP or PNG better for web use?
- PNG — always. BMP is supported by browsers but produces files 5–10× larger with no benefit for web delivery. Use PNG, WebP, or AVIF for the web.
- Does BMP support ICC color profiles?
- Only in the V5 header variant (BITMAPV5HEADER, 124 bytes). Most software ignores BMP color profiles entirely and assumes sRGB. PNG supports ICC profiles reliably via the iCCP chunk.
- Can I convert PNG-8 (indexed) to BMP?
- Yes. The 256-color palette transfers directly to BMP's color table. The output is an 8-bit indexed BMP with identical colors.
- What about animated PNG (APNG) to BMP?
- BMP has no animation support. Convertify extracts the first frame of an APNG and converts it to a static BMP.
Lossless to lossless — what changes and what doesn't
PNG and BMP are both lossless raster formats, so converting between them preserves every pixel value exactly. The difference is entirely in how those pixels are stored. PNG applies a two-stage compression pipeline: first a per-row adaptive filter (Sub, Up, Average, or Paeth) transforms pixel values into differences from neighbours, then DEFLATE (LZ77 + Huffman coding) compresses the result. BMP skips all of this and stores raw pixel bytes directly.
The conversion process decompresses the PNG's DEFLATE stream, strips the filter bytes, and writes each pixel's RGB (or RGBA) values into BMP's bottom-up row format with 4-byte padding per row. Color values are bit-identical before and after — only the container changes.
Handling PNG transparency in BMP
This is the biggest practical difference between the two formats. PNG supports a full 8-bit alpha channel (256 levels of transparency per pixel), while standard 24-bit BMP has no alpha support at all.
Convertify handles this in two ways. By default, transparent pixels are composited onto a white background and output as 24-bit BMP — the most compatible variant. If you need to preserve transparency, 32-bit BMP with the BITMAPV5HEADER writes a full BGRA pixel layout where the fourth byte is the alpha value. This works in Windows 8+ Photos, PowerPoint, .NET applications, and modern image editors — but many legacy tools ignore the alpha byte entirely.
For web-optimized transparency, WebP or AVIF are better choices. For legacy systems that need transparency, 32-bit BMP is the only option.
File size explosion: PNG vs BMP
A 1920×1080 PNG screenshot typically weighs 500 KB – 2 MB depending on content complexity. The same image as 24-bit BMP is always 5.93 MB — regardless of content. A simple solid-color PNG might be 5 KB; the BMP equivalent is still 5.93 MB. This predictability is actually useful for embedded systems that need fixed-size frame buffers, but for storage and transfer it's a significant penalty.
At 4K resolution (3840×2160), 24-bit BMP reaches 23.7 MB and 32-bit BMP hits 31.6 MB. PNG compression ratios of 3–21× over BMP are typical, with flat-color images (logos, diagrams, UI elements) showing the highest ratios.
Why convert PNG to BMP — real use cases
The same systems that require BMP from any source: Win32 GDI applications calling LoadImage() with IMAGE_BITMAP, industrial HMI panels (Siemens WinCC, Omron NB series, Mitsubishi GOT), embedded firmware splash screens, thermal printers expecting monochrome BMP logos, and CNC raster engravers.
A specific workflow is converting design assets from PNG through BMP for legacy game engines — RPG Maker 2000/2003 requires BMP sprite sheets with specific palette constraints. Windows .ico and .cur files also embed BMP-format data internally, so icon editors often need BMP intermediates.
If your downstream tool accepts PNG, there is no reason to convert to BMP. PNG is smaller, supports metadata and transparency better, and is equally universal on modern systems.
Color depth considerations
PNG supports multiple color types: grayscale (1/2/4/8/16-bit), indexed (1/2/4/8-bit with palette), RGB (8/16-bit per channel), and RGBA (8/16-bit per channel). BMP supports 1/4/8/16/24/32-bit depths.
Convertify maps PNG color types to BMP as follows: PNG RGB (24-bit) becomes BMP 24-bit directly. PNG RGBA (32-bit) becomes BMP 32-bit with V5 header, or 24-bit with alpha composited onto background. PNG indexed becomes BMP 8-bit with the same palette transferred to BMP's color table. PNG 16-bit per channel is quantized down to 8-bit since BMP does not support 16-bit-per-channel truecolor.
The only quality loss occurs in 16-bit-to-8-bit quantization and alpha-to-opaque compositing. All other paths are bit-exact.
When to choose PNG over BMP
Almost always. BMP to PNG is the far more common conversion direction because PNG offers the same lossless quality in 5–10× smaller files. PNG adds ICC color profiles, gamma correction, text metadata, and standardized alpha transparency that BMP handles poorly.
The only reasons to go PNG→BMP are: (1) a specific legacy tool requires .bmp format, (2) an embedded device has a BMP-only image loader, (3) you need fixed-size frame buffer data for direct memory-mapping, or (4) a workflow requires hash-stable uncompressed pixels for forensic evidence.