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Downloads of v 1.0.1:


Last Update:

11 Apr 2017

Package Maintainer(s):

Software Author(s):

  • Google


admin foss jpeg jpg cli optimizer compress compression lossless image compressor google guetzli


  • 1
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1.0.1 | Updated: 11 Apr 2017



Downloads of v 1.0.1:



Software Author(s):

  • Google

Guetzli 1.0.1

  • 1
  • 2
  • 3

Some Checks Have Failed or Are Not Yet Complete

Not All Tests Have Passed

Validation Testing Passed

Verification Testing Passed


Scan Testing Resulted in Flagged:

This package was submitted (and approved) prior to automated virus scanning integration into the package moderation processs.

We recommend clicking the "Details" link to make your own decision on installing this package.

Learn More

Deployment Method: Individual Install, Upgrade, & Uninstall

To install Guetzli, run the following command from the command line or from PowerShell:


To upgrade Guetzli, run the following command from the command line or from PowerShell:


To uninstall Guetzli, run the following command from the command line or from PowerShell:


Deployment Method:


This applies to both open source and commercial editions of Chocolatey.

1. Enter Your Internal Repository Url

(this should look similar to https://community.chocolatey.org/api/v2/)

2. Setup Your Environment

1. Ensure you are set for organizational deployment

Please see the organizational deployment guide

2. Get the package into your environment

  • Open Source or Commercial:
    • Proxy Repository - Create a proxy nuget repository on Nexus, Artifactory Pro, or a proxy Chocolatey repository on ProGet. Point your upstream to https://community.chocolatey.org/api/v2/. Packages cache on first access automatically. Make sure your choco clients are using your proxy repository as a source and NOT the default community repository. See source command for more information.
    • You can also just download the package and push it to a repository Download

3. Copy Your Script

choco upgrade guetzli -y --source="'INTERNAL REPO URL'" [other options]

See options you can pass to upgrade.

See best practices for scripting.

Add this to a PowerShell script or use a Batch script with tools and in places where you are calling directly to Chocolatey. If you are integrating, keep in mind enhanced exit codes.

If you do use a PowerShell script, use the following to ensure bad exit codes are shown as failures:

choco upgrade guetzli -y --source="'INTERNAL REPO URL'" 

Write-Verbose "Exit code was $exitCode"
$validExitCodes = @(0, 1605, 1614, 1641, 3010)
if ($validExitCodes -contains $exitCode) {
  Exit 0

Exit $exitCode

- name: Install guetzli
    name: guetzli
    version: '1.0.1'
    state: present

See docs at https://docs.ansible.com/ansible/latest/modules/win_chocolatey_module.html.

chocolatey_package 'guetzli' do
  action    :install
  source   'INTERNAL REPO URL'
  version  '1.0.1'

See docs at https://docs.chef.io/resource_chocolatey_package.html.

cChocoPackageInstaller guetzli
    Name     = "guetzli"
    Version  = "1.0.1"
    Source   = "INTERNAL REPO URL"

Requires cChoco DSC Resource. See docs at https://github.com/chocolatey/cChoco.

package { 'guetzli':
  ensure   => '1.0.1',
  provider => 'chocolatey',
  source   => 'INTERNAL REPO URL',

Requires Puppet Chocolatey Provider module. See docs at https://forge.puppet.com/puppetlabs/chocolatey.

4. If applicable - Chocolatey configuration/installation

See infrastructure management matrix for Chocolatey configuration elements and examples.

Package Approved

This package was approved by moderator flcdrg on 17 Apr 2017.



Guetzli is a JPEG encoder that aims for excellent compression density at high visual quality. Guetzli-generated images are typically 20-30% smaller than images of equivalent quality generated by libjpeg. Guetzli generates only sequential (nonprogressive) JPEGs due to faster decompression speeds they offer.


Note: Guetzli uses a large amount of memory. You should provide 300MB of memory per 1MPix of the input image.

Note: Guetzli uses a significant amount of CPU time. You should count on using about 1 minute of CPU per 1 MPix of input image.

Note: Guetzli assumes that input is in sRGB profile with a gamma of 2.2. Guetzli will ignore any color-profile metadata in the image.

To try out Guetzli you need to build or download the Guetzli binary. The binary reads a PNG or JPEG image and creates an optimized JPEG image:

guetzli [--quality Q] [--verbose] original.png output.jpg
guetzli [--quality Q] [--verbose] original.jpg output.jpg

Note that Guetzli is designed to work on high quality images. You should always prefer providing uncompressed input images (e.g. that haven't been already compressed with any JPEG encoders, including Guetzli). While it will work on other images too, results will be poorer. You can try compressing an enclosed sample high quality image.

You can pass a --quality Q parameter to set quality in units equivalent to libjpeg quality. You can also pass a --verbose flag to see a trace of encoding attempts made.

Please note that JPEG images do not support alpha channel (transparency). If the input is a PNG with an alpha channel, it will be overlaid on black background before encoding.


On Windows

  1. Get a copy of the source code, either by cloning this repository, or by downloading an archive and unpacking it.
  2. Install Visual Studio 2015 and vcpkg
  3. Install libpng using vcpkg: .\vcpkg install libpng.
  4. Cause the installed packages to be available system-wide: .\vcpkg integrate install. If you prefer not to do this, refer to vcpkg's documentation.
  5. Open the Visual Studio project enclosed in the repository and build it.


Verification is intended to assist the Chocolatey moderators and community
in verifying that this package's contents are trustworthy.

Package can be verified like this:

1. Go to

   x32: https://github.com/google/guetzli/releases/download/v1.0.1/guetzli_windows_x86.exe
   x64: https://github.com/google/guetzli/releases/download/v1.0.1/guetzli_windows_x86-64.exe

   to download the installer.

2. You can use one of the following methods to obtain the SHA256 checksum:
   - Use powershell function 'Get-FileHash'
   - Use Chocolatey utility 'checksum.exe'

   checksum32: 7fb69c00a99a9c0fd7e47f4d263b74c68a7e63405fc27784d955895e8b7f2061
   checksum64: bbac41d606c96cc57a94c802e581591647d6e1cfc83a97522509edbd392faeca

Using AU:

   Get-RemoteChecksum32 https://github.com/google/guetzli/releases/download/v1.0.1/guetzli_windows_x86.exe
   Get-RemoteChecksum64 https://github.com/google/guetzli/releases/download/v1.0.1/guetzli_windows_x86-64.exe

File 'LICENSE' is obtained from:
    LICENSE: https://raw.githubusercontent.com/google/guetzli/v1.0.1/LICENSE
$ErrorActionPreference = 'Stop'

$toolsDir = Split-Path $MyInvocation.MyCommand.Definition
if ((Get-ProcessorBits 64) -and $env:chocolateyForceX86 -ne 'true') {
    Write-Host "Installing 64 bit version"
    rm $toolsDir\guetzli_windows_x86_x32.exe
    mv $toolsDir\guetzli_windows_x86-64_x64.exe $toolsDir\guetzli.exe -Force
} else {
    Write-Host "Installing 32 bit version"
    rm $toolsDir\guetzli_windows_x86-64_x64.exe
    mv $toolsDir\guetzli_windows_x86_x32.exe $toolsDir\guetzli.exe -Force
md5: 7C84229746CE891178FF63C790806877 | sha1: F32FEAFE28CE265886CEBBC549221D9A6576C772 | sha256: BBAC41D606C96CC57A94C802E581591647D6E1CFC83A97522509EDBD392FAECA | sha512: A98DD145785963B0CB08D074177515F70D9702239625C3EE10AAFF5F9B27CB2E600A9180489D846A9568C70348B6514B00829DA2B209B40E524D8F6BDB1C3CE6
md5: C3E0E6E3BEFAE7E98D90BBB2870C8C12 | sha1: E3158260A27561D06AA97F370196AA35A02218AA | sha256: 7FB69C00A99A9C0FD7E47F4D263B74C68A7E63405FC27784D955895E8B7F2061 | sha512: 4B7BE7681B5F6FD8EAD8A853E4B88C219DE99F9E3E2586556FB1C340B21415D7E2C14EFDABD82FE9DD687B3807F23E630AD1C804B69C57C5E1E4F7082261EE65

Log in or click on link to see number of positives.

In cases where actual malware is found, the packages are subject to removal. Software sometimes has false positives. Moderators do not necessarily validate the safety of the underlying software, only that a package retrieves software from the official distribution point and/or validate embedded software against official distribution point (where distribution rights allow redistribution).

Chocolatey Pro provides runtime protection from possible malware.

Add to Builder Version Downloads Last Updated Status

This package has no dependencies.

Discussion for the Guetzli Package

Ground Rules:

  • This discussion is only about Guetzli and the Guetzli package. If you have feedback for Chocolatey, please contact the Google Group.
  • This discussion will carry over multiple versions. If you have a comment about a particular version, please note that in your comments.
  • The maintainers of this Chocolatey Package will be notified about new comments that are posted to this Disqus thread, however, it is NOT a guarantee that you will get a response. If you do not hear back from the maintainers after posting a message below, please follow up by using the link on the left side of this page or follow this link to contact maintainers. If you still hear nothing back, please follow the package triage process.
  • Tell us what you love about the package or Guetzli, or tell us what needs improvement.
  • Share your experiences with the package, or extra configuration or gotchas that you've found.
  • If you use a url, the comment will be flagged for moderation until you've been whitelisted. Disqus moderated comments are approved on a weekly schedule if not sooner. It could take between 1-5 days for your comment to show up.
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