FLIF

No. Avoid FLIF for ingestion or long-term storage; the format is effectively discontinued, having been folded into the effort that became JPEG XL, and never had broad application or OS support.

Any FLIF files sitting in a DAM library should be flagged and converted, not left as-is. Because the format is frozen and has no native support in operating systems, browsers, or creative software, legacy assets risk becoming unreadable as encoder/decoder tools age out. The practical step is batch conversion to PNG or JPEG XL promptly, using the reference FLIF tools before they become harder to run.

No. FLIF has no standardized metadata block equivalent to EXIF, IPTC, or XMP, so camera settings, copyright, keywords, and other structured fields cannot be embedded or reliably preserved in the file. This gap makes FLIF unsuitable for professional image workflows that depend on metadata for search, rights management, and asset tracking, and it is one more reason the format never gained traction beyond experimental use.

FLIF set out to beat PNG and lossless WebP on compression ratio while adding a distinctive trick: MANIAC entropy coding combined with progressive interlacing, so a partial download still renders a usable, recognizable preview instead of a blank or broken image. The goal was smaller lossless files that degraded gracefully over slow connections, not just raw file-size savings.

No. FLIF never reached mainstream adoption: there is no native support in Windows, macOS, major web browsers, Photoshop, or Lightroom. The only software available is the reference FLIF encoder/decoder command-line tools and a limited, community-maintained GIMP plugin. Without operating-system or major creative-suite integration, opening or editing a FLIF file today requires specialized tools most users and workflows simply do not have installed.

FLIF was released in October 2015 by Jon Sneyers and Pieter Wuille as an experimental lossless format. Development did not continue independently: its creator merged FLIF's core ideas into a successor project that ultimately became part of JPEG XL. As a result, FLIF itself is now frozen and effectively unmaintained, with no updates, bug fixes, or new tooling expected.

Since FLIF's own ideas live on inside JPEG XL, the practical path is to convert existing FLIF files to JPEG XL using libjxl-based encoders, which represent the direct technical successor. PNG remains a safe fallback where JPEG XL support is not yet available. Either way, conversion should happen while the reference FLIF decoder still works, rather than waiting until the format becomes harder to open.

Yes. FLIF supports arbitrary bit depth, alpha transparency, and animation, putting it on par with formats like APNG or WebP on paper. In practice, though, these capabilities are largely moot: since FLIF never gained OS, browser, or creative-tool support and its development was folded into JPEG XL, no active workflow benefits from these features today, and JPEG XL now offers the same capabilities with real tooling.