# FLIF-hub/FLIF

Free Lossless Image Format

Repository: https://github.com/FLIF-hub/FLIF
Canonical: https://ross.abutalabs.com/products/flif
Language: C++
License: NOASSERTION
License Family: other
Topics: image-compression, encoder, decoder, flif, lossless-compression-algorithm
Last push: 2024-01-09T03:07:54+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 4013, "days_push": 967, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3740, forks 232 (observed 2026-08-28T04:08:15.946760+00:00)

## What it is
FLIF (Free Lossless Image Format) is a lossless image format and reference implementation in C++ based on MANIAC compression, outperforming PNG, lossless WebP, and lossless JPEG2000 in compression ratio. It includes a command-line encoder/decoder, shared libraries, and supports progressive interlacing so partial downloads render as reasonable lossy previews.

## Use cases
- compress images losslessly smaller than PNG or WebP
- encode and decode .flif image files from the command line
- serve progressively-loading lossless images over slow connections
- integrate a lossless image decoder into an application via libflif_dec
- convert PNG images to a more compact lossless format

## When to choose
- you need maximum lossless compression ratio for images
- you want progressive rendering of partially downloaded images
- you are working with legacy FLIF files or archives

## When to avoid
- starting a new project - FLIF is superseded by JPEG XL (libjxl)
- you need actively maintained software or security updates
- you need broad ecosystem or browser support

## Facets
- artifact type: library
- maturity: abandoned
- function: image-processing, compression
- domain: image-processing, graphics, files
- platform: windows, cross-platform, cpp
- tags: lossless-image-format, image-encoder, image-decoder, maniac-compression, progressive-interlacing, superseded-by-jpeg-xl, linux, macos

## Member repositories
- FLIF-hub/FLIF (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:15.946760+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 2026-08-29T18:29:07.370293+00:00, confidence not recorded.
  - readme: https://github.com/FLIF-hub/FLIF (fetched 2026-08-28T04:08:15.946760+00:00, sha 754023edf733)
- Data as of 2026-08-30T08:39:29.467469+00:00.