Compress JXL to 500KB

1. Upload your JXL (up to 50 MB).
2. The compressor automatically targets 500 KB or under.
3. Download the compressed JXL — often lossless.

500 KB is a generous target for JXL — high-resolution images and lossless encoding both comfortably fit. Ideal for archival, high-quality web, and print preview.

500 KB is generous for JXL — because JXL is the most efficient format, even high-resolution images often fit under 500 KB in lossless mode. This is useful for archival (preserve every pixel), high-quality web delivery, and print preview. JXL's efficiency means you get more quality for the same file size than any other format.

The compressor decodes the JXL and re-encodes it using libjxl. It first attempts lossless modular encoding; if the output exceeds 500 KB, it switches to lossy VarDCT and iteratively reduces quality until the target is met. At 500 KB, a JXL is typically 2000-3000px wide with quality 88-95% — often fully lossless.

• Archiving JXL masters with lossless compression.
• High-resolution JXL delivery for portfolios.
• Print preview (small-format) with JXL.
• Storage optimization for large JXL libraries.
• High-quality web delivery for retina displays.
• Preparing JXL assets for archival systems.
• Any platform with a 500 KB JXL limit.

500 KB is generous for JXL — most images are fully lossless at this size. For large originals, lossy mode at 88-95% quality is visually indistinguishable from the original. Great for archival and high-quality delivery.

• 500 KB is still large for web performance — consider 100 KB for web-only use.
• Not ideal for very large prints (poster size).
• JXL browser support is limited (Chrome removed support in 2023).
• Animated JXL sequences use the first frame only.
• HDR metadata may be lost at lower quality settings.

• JXL opens in Firefox, Safari (via OS support), and some viewers.
• Native support in GIMP 2.10+, Krita 5+, Adobe via plugin.
• Windows 11 supports JXL with free extensions.
• Ideal for archival and high-quality delivery.
• Standard JXL — no special software for storage use.

• 500 KB is best for high-resolution and archival use.
• Lossless mode often succeeds at 500 KB — quality is preserved.
• For web performance, use 100 KB instead.
• Transparency is preserved throughout.
• Batch-compress up to 50 MB of JXL files at once.

Need to hit an exact size? Use our dedicated target-size tools:

Output is still slightly over 500 KB

Very large originals may need resizing. Try cropping, or use the general JXL compressor.

Compression takes longer than expected

Lossless JXL uses maximum-efficiency modular encoding, which is slower. Expect 3-5 seconds per image.

File is larger than needed for web

For web use, 100 KB is usually sufficient. Use the 100 KB variant instead.

• JPEG XL — Official Specification