Show HN: Image2JXL – a native macOS JPEG XL converter
A developer created a native macOS app called Image2JXL that converts images to the JPEG XL format locally on the device, without relying on external servers or cloud processing.
Background
- JPEG XL (JXL) is a next-generation image format that offers better compression and quality than JPEG, PNG, or WebP, and supports features like HDR and lossless re-encoding. Despite its technical advantages, browser and OS adoption has been slow — Google removed JXL support from Chrome in 2022, though Apple has added native support in Safari and recent macOS/iOS versions.
- The "Show HN" post is from Hacker News, where developers share projects they've built. "Image2JXL" is a native macOS app (Apple Silicon + Intel) for converting images to JPEG XL locally on the device, using SwiftUI and Apple's Accelerate framework — avoiding cloud uploads.
- The developer's GitHub shows they also built a similar JXL-to-JPEG decoder app (JXL2Image). The project is free/open-source on GitHub, with an App Store version offering a tip‑jar option.