Convert your BMP to PNG
Convert your BMP images to PNG, right in your browser.
Drop your files here
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Convert BMP to PNG in your browser
BMP is used by Windows since the 1980s, stores pixels uncompressed, very large since pixels are uncompressed (a 4K BMP can exceed 30 MB). Portable Network Graphics (PNG) is the more practical choice when universal across browsers, design tools, and any modern OS. Filzy converts BMP to PNG fully in your browser using Rust 'image' crate for decoding and libimagequant + Rust 'image' crate for encoding. The original file never leaves your device, no upload, no tracking, no daily cap. You can drop a single file or batch dozens at once and download the result as a ZIP.
Files stay on your device
Your BMP files are decoded inside a Web Worker via WebAssembly. Nothing reaches a server, nothing is logged, no temporary copy is kept anywhere.
Quality preserved by default
Filzy decodes the BMP pixels, then re-encodes them with libimagequant + Rust 'image' crate at high quality. EXIF metadata is preserved when the target format supports it.
Batch entire folders
Drop dozens of BMP files at once. Filzy converts them in parallel using your CPU cores and packages everything as a single ZIP archive.
How to convert BMP to PNG with Filzy
- 1
Drop your BMP files
Drag the files into the area above, or click to pick them. Filzy accepts standard BMP files of any reasonable size (limited only by your device memory).
- 2
Filzy converts each file locally
Rust 'image' crate decodes the BMP, then libimagequant + Rust 'image' crate writes the PNG. Each file is processed in parallel, up to your CPU core count.
- 3
Download single files or as ZIP
Pick a PNG file to download directly, or click Download all to grab a ZIP archive. The originals on your device are not modified.