Building the product · Independent · 26 Oct 2026

calibreapp/image-actions

A Github Action that automatically compresses JPEGs, PNGs, WebPs & AVIFs in Pull Requests.

← Building the product
Calibre Image Actions. Shrinks image files inside your GitHub pull requests.
Verified26 Oct 2026

Radar check

What we found when we opened it. Every bar is one fact, with its date.

Alive100

Last code pushed 23 Oct 2026, 2 days before this check.

Releases70

Latest release 1.5.0 on 18 May 2026.

Maturity90

Public since April 2019, a little over 7 years.

Adoption64

1,574 stars and 78 forks.

Activity65

32 commits and 0 new issues in the last 90 days.

Community60

20 contributors. 16 pull requests merged in 90 days.

Security80

A security policy says how to report a problem. No published security advisories.

Licence GPL-3.0: free to use; software you hand out that includes it must be GPL tooSetup effort 2 of 5Payoff 4 of 5
How the bars are scored
  • Alive. Days since the last code push: a week or less 100, a month 90, three months 70, six months 50, a year 30, eighteen months 15, older 0.
  • Releases. Age of the latest GitHub release, on a similar scale; no bar when the project publishes no releases.
  • Maturity. Age of the project: eight years 100, five 90, three 70, two 55, one 40, six months 25, younger 10.
  • Adoption. Stars on a log scale: 100,000 stars is 100, 10,000 is 80, 1,000 is 60, 100 is 40.
  • Activity. Commits in the last 90 days: 300 or more 100, 100 85, 30 65, 10 45, any 25.
  • Community. People who have contributed: 100 or more 100, 30 80, 10 60, 5 40, 2 25, one 10.
  • Security. A published security policy 80, none 40; published advisories are listed, not scored.

Checked by Repo Radar on 26 Oct 2026 from the repository on GitHub.

In simple English

This tool checks every picture added to your code repository. It shrinks the file size without making the picture look worse. It runs in the background whenever someone offers a change. You do not need to remember to run a compression tool on your own computer. It is free to use on GitHub.

What it is

A GitHub Action (a piece of automation that runs on GitHub's servers when events happen in your repository) that shrinks image files in pull requests. It uses high-speed compression libraries to strip extra data from graphic files before they get merged into your main project.

What it is good for

Solo builders who want faster website loading times without spending time on manual image optimisation or expensive external services.

Stars1.6k
LicenceGPL-3.0
Latest1.5.0 (2026-05-18)checked 26 Oct 2026
Last code change2026-10-23
Written inTypeScript
Setup effort
2 / 5
Payoff
4 / 5
Good
  • Runs automatically on every pull request so you never forget to shrink images.
  • Supports modern web formats like WebP and AVIF alongside standard JPEGs and PNGs.
  • Posts a helpful comment on your pull request showing how much space you saved.
Watch for
  • Requires a small amount of YAML configuration to set up inside your repository.
  • Does not process pull requests coming from forked repositories by default due to security rules.
  • Will commit changes directly to your pull request branch, which can surprise collaborators.
Replaces

manual image compression tools

Works well with

actions/checkout

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How to get it

Add a workflow file named .github/workflows/image-actions.yml to your repository containing the setup snippet from the project documentation.

Independent: reviewed for Repo Radar outside the daily editions. Every independent repository

On Stack Radar: Build & Ship › Frameworks & Libraries › Image Optimization.

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