BMP to PNG Converter
Convert uncompressed BMP images to lossless PNG files in bulk. Drastically shrink file sizes directly in your browser without uploading to any server.
JPG, PNG, WebP, AVIF, GIF, BMP, ICO, TIFF, HEIC, SVG · up to 50 files
Tips
- BMP files store uncompressed raw pixel grids, resulting in large source files that shrink significantly after PNG compression.
- Both BMP and PNG are lossless formats, meaning your image retains exact pixel color values throughout conversion.
- Convert legacy Windows BMP assets to PNG for standard web publishing, transparency handling, and broader app support.
How to use it
- 1 Select or drag and drop your BMP images into the conversion area.
- 2 Review the queued files and add additional images if you need batch conversion.
- 3 Download the resulting PNG files individually or as a single archive.
What you should know
Bitmap (BMP) images store uncompressed, raw raster data row by row, resulting in excessively large file sizes that are impractical for modern web publishing and network transfer. In contrast, Portable Network Graphics (PNG) applies lossless DEFLATE compression alongside predictive byte filtering. This mathematical compression identifies repetitive patterns across scanlines without discarding a single pixel or compromising color fidelity. Converting 24-bit or 32-bit BMP files to PNG typically reduces storage footprints by up to 80% while retaining bit-for-bit structural accuracy. This makes PNG ideal for technical illustrations, legacy application graphics, UI design assets, and transparent overlays.
This converter processes your BMP files locally using the HTML5 canvas API and native browser decoders. The conversion pipeline decodes standard Windows DIB headers, 24-bit RGB rasters, and 32-bit RGBA structures into full-color PNG representations. Because the conversion is bit-exact, there are no lossy compression artifacts, blurry edges, or color shifts. However, non-standard RLE-compressed BMP variants or legacy palette color depths may normalize to standard sRGB canvas color spaces. The operation runs entirely within your browser tab, ensuring fast parallel batch processing while keeping your source graphic files strictly private.
Frequently asked questions
Will converting BMP to PNG degrade my image quality?
No. Both BMP and PNG are lossless raster formats, meaning every pixel color and coordinate is preserved identically without visual degradation.
Why is the resulting PNG file so much smaller than the BMP original?
BMP files record raw pixel values without compression, while PNG uses lossless DEFLATE compression to pack repetitive color data efficiently into fewer bytes.
Can I convert multiple BMP images at the same time?
Yes. You can upload multiple BMP files to process them concurrently in your browser and download each converted PNG when ready.
Guides
Articles and format references related to this tool.
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