PNG to BMP Converter

PNG and BMP are both lossless formats — every pixel is stored exactly. What differs is how: PNG applies DEFLATE compression to the pixel data, producing a compact file. BMP writes raw pixel values directly to disk, uncompressed, row by row, with no space-saving encoding at all. A 1000×1000 24-bit PNG is often 50–200 KB depending on image content. The same image as a 24-bit BMP is always exactly 2.86 MB. That predictable, uncompressed structure is why BMP has never gone away: Windows GDI, legacy industrial software, certain game engines, and several hardware interfaces expect raw pixel data in BMP format because they parse it directly without a decoder library.

AT USE PNG to BMP Converter processes the conversion server-side using ImageMagick. Upload a PNG up to 20 MB, and download a 24-bit BMP file immediately. No quality settings are needed — PNG is already lossless, and BMP is uncompressed; the pixel values in the output are identical to those in the source. Both files are deleted from the server after your download completes. No account required, no watermark.

What changes and what does not

Pixel values: unchanged. Every RGB value from the PNG lands in the BMP at exactly the same position. The conversion is a pixel-for-pixel copy from a compressed container into an uncompressed one — no resampling, no quantization, no color adjustment.

File size: larger, always. A 200 KB PNG icon that decompresses to 500×500 pixels becomes 717 KB as a 24-bit BMP (500 × 500 × 3 bytes, plus a 54-byte header). Photographic PNGs are often 5–15× larger as BMP; flat-color graphics with high PNG compression ratios can be 20–30× larger.

Transparency: not preserved in standard output. BMP supports a 32-bit format with an alpha channel, but most software that reads BMP expects 24-bit (no alpha). The converter produces 24-bit BMP output by default, compositing any transparent pixels against white. If your downstream software specifically requires 32-bit BMP with alpha, note that support varies widely across applications; PNG is the universal transparent-background format outside Windows-specific contexts.

Technical note on BMP structure

BMP files begin with a 14-byte file header (magic bytes BM, file size, reserved fields, pixel data offset), followed by a BITMAPINFOHEADER (40 bytes describing width, height, bit depth, compression mode). For 24-bit BMP, the compression field is 0 (BI_RGB — no compression). Each pixel row is padded to a 4-byte boundary. Rows are stored bottom-to-top by default (negative height in the header indicates top-to-bottom, but most applications write bottom-to-top). ImageMagick handles the padding and row order automatically; the output is a standards-compliant 24-bit BMP readable by any Windows application.