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Man Pages

Manual Reference Pages  -  DWEBP (1)


dwebp - decompress a WebP file to an image file


See Also
     Output file format details


dwebp [options]input_file.webp


This manual page documents the dwebp command.

dwebp decompresses WebP files into PNG, PAM, PPM or PGM images.


The basic options are:
-h Print usage summary.
-version Print the version number (as major.minor.revision) and exit.
  Specify the name of the output file (as PNG format by default). Using "-" as output name will direct output to ’stdout’.
  Explicitly specify the input file. This option is useful if the input file starts with an ’-’ for instance. This option must appear last. Any other options afterward will be ignored. If the input file is "-", the data will be read from stdin instead of a file.
-bmp Change the output format to uncompressed BMP.
-tiff Change the output format to uncompressed TIFF.
-pam Change the output format to PAM (retains alpha).
-ppm Change the output format to PPM (discards alpha).
-pgm Change the output format to PGM. The output consists of luma/chroma samples instead of RGB, using the IMC4 layout. This option is mainly for verification and debugging purposes.
-yuv Change the output format to raw YUV. The output consists of luma/chroma-U/chroma-V samples instead of RGB, saved sequentially as individual planes. This option is mainly for verification and debugging purposes.
-nofancy Don’t use the fancy upscaler for YUV420. This may lead to jaggy edges (especially the red ones), but should be faster.
  Don’t use the in-loop filtering process even if it is required by the bitstream. This may produce visible blocks on the non-compliant output, but it will make the decoding faster.
  Specify a dithering strength between 0 and 100. Dithering is a post-processing effect applied to chroma components in lossy compression. It helps by smoothing gradients and avoiding banding artifacts.
  If the compressed file contains a transparency plane that was quantized during compression, this flag will allow dithering the reconstructed plane in order to generate smoother transparency gradients.
  Disable all dithering (default).
-mt Use multi-threading for decoding, if possible.
  Crop the decoded picture to a rectangle with top-left corner at coordinates (x_position, y_position) and size width x height. This cropping area must be fully contained within the source rectangle. The top-left corner will be snapped to even coordinates if needed. This option is meant to reduce the memory needed for cropping large images. Note: the cropping is applied before any scaling.
-flip Flip decoded image vertically (can be useful for OpenGL textures for instance).
-resize, -scale width height
  Rescale the decoded picture to dimension width x height. This option is mostly intended to reducing the memory needed to decode large images, when only a small version is needed (thumbnail, preview, etc.). Note: scaling is applied after cropping. If either (but not both) of the width or height parameters is 0, the value will be calculated preserving the aspect-ratio.
-quiet Do not print anything.
-v Print extra information (decoding time in particular).
-noasm Disable all assembly optimizations.


Please report all bugs to our issue tracker:
Patches welcome! See this page to get started:


dwebp picture.webp -o output.png
dwebp picture.webp -ppm -o output.ppm
dwebp -o output.ppm -- ---picture.webp
cat picture.webp | dwebp -o - -- - > output.ppm


dwebp is a part of libwebp and was written by the WebP team.
The latest source tree is available at

This manual page was written by Pascal Massimino <>, for the Debian project (and may be used by others).


cwebp(1), gif2webp(1), webpmux(1)
Please refer to for additional information.

    Output file format details

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--> DWEBP (1) December 11, 2015

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