# oxipng/oxipng

Multithreaded PNG optimizer written in Rust

Repository: https://github.com/oxipng/oxipng
Canonical: https://ross.abutalabs.com/products/oxipng
Language: Rust
License: MIT
License Family: permissive
Topics: image-compression, image-optimization, png, png-compression, png-optimization, rust
Last push: 2026-08-24T13:44:29+00:00

## Health v2 (maintenance only)
Score: 94/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 84, longevity 100
- inputs: {"age_days": 3887, "days_push": 9, "days_rel": 25, "gap_med": 81.5, "n_releases_24m": 7}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4188, forks 155 (observed 2026-08-28T04:08:38.797778+00:00)

## What it is
Oxipng is a multithreaded, lossless PNG/APNG compression optimizer written in Rust. It can be used as a command-line utility or as a Rust library, offering configurable optimization levels and metadata stripping.

## Use cases
- compress png images without losing quality
- optimize pngs for faster website loading
- strip metadata from png files
- reduce png file size in a build pipeline
- batch optimize png images from the command line
- shrink pngs with transparency for the web

## When to choose
- you need lossless PNG compression with fast, multithreaded performance
- you want a CLI tool that integrates easily into build or CI pipelines
- you need a Rust library for programmatic PNG optimization
- you want configurable trade-offs between speed and compression level

## When to avoid
- you need to optimize JPEG, WebP, or other non-PNG formats
- you require lossy image compression for maximum size reduction
- you need a GUI-based image optimizer

## Facets
- artifact type: cli-tool
- maturity: stable
- function: image-processing, compression, cli
- domain: image-processing, files, web-development
- platform: windows, rust, cli, cross-platform
- tags: png-optimizer, lossless-compression, apng, image-optimization, multithreaded, command-line, linux, macos

## Member repositories
- oxipng/oxipng (main) score 94

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:38.797778+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 2026-08-29T18:22:36.821828+00:00, confidence not recorded.
  - readme: https://github.com/oxipng/oxipng (fetched 2026-08-28T04:08:38.797778+00:00, sha 5c0060fdcdc9)
  - registry_crates: https://crates.io/api/v1/crates/oxipng (fetched 2026-08-29T09:12:59.410144+00:00, sha 35f7effb02c3)
- Data as of 2026-08-30T08:39:29.467469+00:00.