Why convert BMP to PNG?

BMP files are uncompressed and very large. PNG is lossless and typically reduces file size by 5–10× with identical pixel data.

Are my files uploaded?

No. Conversion is handled by the browser canvas API; the BMP is decoded locally.

No. PNG is lossless. The pixel values are preserved exactly.

Yes — PNG compression is lossless, so every pixel is identical.

Typically 5–10× smaller for screenshots and UI captures; less for noisy photo BMPs.

Yes, the browser canvas decoder handles common BMP variants. Very old 1-bit / 4-bit BMPs may need a one-off conversion in a desktop tool first.

將老舊的 BMP 點陣圖檔轉為壓縮後的 PNG,像素資料不變。

BMP file(s)

Select one or more files to begin.

Why convert BMP to PNG?: BMP files are uncompressed and very large. PNG is lossless and typically reduces file size by 5–10× with identical pixel data.
Are my files uploaded?: No. Conversion is handled by the browser canvas API; the BMP is decoded locally.
Is quality lost?: No. PNG is lossless. The pixel values are preserved exactly.
Will the PNG look identical?: Yes — PNG compression is lossless, so every pixel is identical.
How much smaller will the PNG be?: Typically 5–10× smaller for screenshots and UI captures; less for noisy photo BMPs.
Are 24-bit and 32-bit BMPs both supported?: Yes, the browser canvas decoder handles common BMP variants. Very old 1-bit / 4-bit BMPs may need a one-off conversion in a desktop tool first.

Last updated: 2026-05-20 By jarvisbox