BMP → PNG Converter

Drag & Drop your .bmp file here, or pick a file below. Nothing is uploaded.

Output width (px)

Leave blank to auto-use original width.

Output height (px)

If only one dimension is set, aspect ratio is preserved.

Scale (x)

Applied when width/height are blank.

Background

Transparent

Uncheck to fill a solid background before export.

Load a BMP or use the example to preview.

Intrinsic size: -

Output size: -

BMP → PNG - Quick Cheat Sheet

Local only: Everything happens in your browser; files aren't uploaded.
Decoding: Modern browsers decode most uncompressed or simple BMPs via createImageBitmap / Image.
Transparency: Classic BMP usually has no alpha; PNG supports transparency. Use a solid background if desired.
Sizing: Set width and/or height. If one is blank, the other is computed. When both blank, Scale multiplies the original size.
Color & orientation: Browser decoders handle bottom-up vs top-down BMPs automatically.
Limits: Very large BMPs can hit canvas memory limits. This tool caps canvas dimension to a safe maximum.
Privacy: The bitmap never leaves this page; your image is processed locally.

How sizes are chosen