DragonFly On-Line Manual Pages
DWEBP(1) DragonFly General Commands Manual DWEBP(1)
dwebp - decompress a WebP file to an image file
dwebp [options] input_file.webp
This manual page documents the dwebp command.
dwebp decompresses WebP files into PNG, PAM, PPM or PGM images. Note:
Animated WebP files are not supported.
The basic options are:
-h Print usage summary.
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.
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
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
Disable all dithering (default).
-mt Use multi-threading for decoding, if possible.
-crop x_position y_position width height
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
-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
-quiet Do not print anything.
-v Print extra information (decoding time in particular).
-noasm Disable all assembly optimizations.
Please report all bugs to the 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
<firstname.lastname@example.org>, for the Debian project (and may be used
cwebp(1), gif2webp(1), webpmux(1)
Please refer to https://developers.google.com/speed/webp/ for
Output file format details
November 17, 2021 DWEBP(1)