# Lymphatus/caesium-image-compressor

Caesium is an image compression software that helps you store, send and share digital pictures, supporting JPG, PNG, WebP and TIFF formats.   You can quickly reduce the file size (and resolution, if you want) by preserving the overall quality of the image.

Repository: https://github.com/Lymphatus/caesium-image-compressor
Canonical: https://ross.abutalabs.com/products/caesium-image-compressor
Homepage: https://saerasoft.com/caesium
Language: C++
License: GPL-3.0
License Family: copyleft
Topics: image-compression, caesium, libcaesium, compression, cross-platform, macos, windows, linux
Last push: 2026-04-07T08:12:55+00:00

## Health v2 (maintenance only)
Score: 68/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 76, release rhythm 40, longevity 100
- inputs: {"age_days": 3894, "days_push": 148, "days_rel": 473, "gap_med": 9, "n_releases_24m": 6}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 6266, forks 357 (observed 2026-08-28T04:09:41.151451+00:00)

## What it is
Caesium Image Compressor is a free, open-source desktop application for compressing JPG, PNG, WebP, and TIFF images while preserving visual quality. It offers a GUI with real-time preview and batch processing, plus companion command-line and online tools.

## Use cases
- compress photos to reduce file size
- batch resize and optimize images for the web
- shrink pictures before emailing or uploading
- convert images to webp
- reduce image resolution while keeping quality
- optimize website images without visible quality loss

## When to choose
- you need a simple GUI tool to compress many images at once
- you want free, cross-platform image optimization on Windows, macOS, or Linux
- you want optional resolution reduction and metadata control
- you prefer an offline desktop tool with an online and CLI companion

## When to avoid
- you need programmatic image manipulation beyond compression and resizing
- you require lossless-only or exotic formats beyond JPG, PNG, WebP, and TIFF
- you need a server-side or headless-only pipeline (consider libcaesium or CaesiumCLT instead)
- you run a 32-bit OS or Windows 7/8 without using the old v1.x release

## Facets
- artifact type: application
- maturity: active
- function: image-processing, compression, gui, cli
- domain: image-processing, photography, cross-platform, files
- platform: windows, cross-platform
- tags: image-compression, qt, jpg, png, webp, tiff, batch-processing, photo-optimization, macos, linux, desktop

## Member repositories
- Lymphatus/caesium-image-compressor (main) score 68

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:41.151451+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:46:30.205274+00:00, confidence not recorded.
  - readme: https://github.com/Lymphatus/caesium-image-compressor (fetched 2026-08-28T04:09:41.151451+00:00, sha 726eddd8423b)
  - homepage: https://saerasoft.com/caesium (fetched 2026-08-29T08:43:06.001025+00:00, sha ee5e3812b314)
- Data as of 2026-08-30T08:39:29.467469+00:00.