BMP to WebP encoder

Convert an uncompressed BMP to lossy or lossless WebP locally in your browser. Three statically linked QIP components cover opaque photos, lossy transparency, and exact lossless pixels; the image is not uploaded.

24-bit BGR or 32-bit BGRX/BGRA BMP

Encoding

Lossy, opaque Lossy + alpha Lossless

Quality (0–100) Method (0 fast – 6 slow) YUV conversion SharpYUV Fast conversion Memory strategy Lower memory Faster, more memory Background for transparency

Opaque encoding reserves 448 MiB of Wasm memory. Declared V5 alpha is composited over the selected background; legacy BI_RGB is treated as opaque.

Encode WebP Cancel Download WebP

All three components accept at most 25,000,000 pixels and 8192 pixels on either side. Opaque mode accepts 24-bit BI_RGB, 32-bit BI_RGB BGRX, and explicitly masked V5 BGRA; declared alpha is flattened over the selected background. The alpha-preserving modes require 32-bit pixels. Opaque lossy mode is the better default for photographs, while lossless mode is intended for pixels that must round-trip exactly. Resize larger camera originals before encoding.

The worker is discarded after every encode. This releases its fixed Wasm memory instead of keeping a 448 MiB, 1.1875 GiB, or 1.5 GiB instance attached to the page.

Components #

• bmp-to-webp-lossy.wasm — 324.92 kB
• bmp-to-webp-lossy-opaque.wasm — 179.63 kB
• bmp-to-webp-lossless.wasm — 127.19 kB

CLI equivalent #

qip run components/image/bmp/bmp-to-webp-lossy-opaque.wasm \
  '?quality=95&method=4&sharp_yuv=1&low_memory=1&background_color=0xffffff' \
  < input.bmp > output.webp

qip run components/image/bmp/bmp-to-webp-lossy.wasm \
  '?quality=95&method=4&sharp_yuv=1&low_memory=1' \
  < input.bmp > output.webp

qip run components/image/bmp/bmp-to-webp-lossless.wasm '?level=6' \
  < input.bmp > output.webp