Simple Guetzli

A Guetzli compression helper

go get github.com/romainmenke/simple-guetzli

or download from the latest release.

This requires : Guetzli

Why?

Guetzli is cpu intensive and waiting for builds / compiles /... is something we all like to avoid. This little tool keeps a log of compressed files and skips those that have already been done.

Now you can safely watch a folder with images and compress only that what needs to be done.

In short :

compresses an entire folder at once
executes compressions in parallel
tracks what has been compressed
determines file changes and recompresses

Useful :

cancel at any time, finished compressions will not need to be redone.
manage max threads.
max memory is divided by number of Guetzli instances (so 1000mb ram with 4 threads will give 250mb ram for each)
dontgrow flag deletes image files that got bigger because Geutzli failed to shrink them.
copy flag to keep your input and output dirs in sync despite Guetzli errors or files that grew.

Options

Flags:
      --help           Show context-sensitive help (also try --help-long and --help-man).
  -q, --quality=95     Visual quality to aim for, expressed as a JPEG quality value. Default value is 95.
      --log="info"     Log level
  -m, --memlimit=6000  Memory limit in MB. Guetzli will fail if unable to stay under the limit. Default limit is 6000
      --nomemlimit     Do not limit memory usage.
  -f, --force          Force recompression
      --force-quality  Force recompression if quality changed
  -t, --threads=3      Max concurrent threads. Default limit is 3
  -g, --dontgrow       Delete compressed files that got bigger
  -c, --copy           Copy all files from source folder to output, without overwriting compression results
  -v, --version        Guetzli Version

Args:
  [<source>]  Source directory
  [<output>]  Output directory
  [<log>]     Log directory, the log is used to prevent duplicate compressions