thearchivist.funPNG's third edition brings animation and modern color into the standard
W3C published the third edition of the Portable Network Graphics specification as a Recommendation on 24 June 2025. The update incorporated Animated PNG and added support for modern color information, including high dynamic range workflows. It also brought established extensions and clarifications into the maintained specification. The milestone is easy to misunderstand as the invention of animation in PNG. Animated PNG already existed in implementations; the 2025 event was its incorporation into the W3C specification. A format's cultural use, browser support and standards publication can have different timelines. Recording those distinctions is essential when a familiar file extension has been used for years before a formal document catches up. PNG's chunk-based structure allows an image to carry more than compressed pixel samples. Color information and other metadata affect how software interprets and displays the file. Two viewers may therefore produce different-looking results if they support different parts of the format or handle color differently. A valid file and a visually faithful rendering are related but separate concerns. For archives and creators, the practical implication is to retain original assets and document the export process. Converting an animated or high-dynamic-range source into a simple still image can discard behavior or color information even when the result keeps a familiar extension. A thumbnail is useful for discovery but should not silently replace the preservation copy. Test the file in the intended viewing environment and describe meaningful limitations. This revision shows that long-lived web formats remain active infrastructure: continuity depends on maintenance, clearer specifications and implementations that can interpret evolving capabilities without losing older material.
Context and provenance
Read this with the archive's 1996 PNG entry. The long interval illustrates that a standard can be stable and still need revision as creative workflows and displays change. The useful comparison is not merely old versus new, but which properties a particular file uses and which properties a particular viewer supports. For a collection, record format, dimensions, animation status and available color-profile information where relevant. Keep a representative preview for browsing and the original file for closer work. This avoids confusing the convenience of a lightweight display image with the completeness of the underlying visual record.
Why it matters
A widely used image standard formally incorporated animation and newer color capabilities while preserving its long-running format identity.
Sources and evidence
Editorial review: 2026-09-23. New evidence may change this account.