Compress JXL to 100KB

1. Upload your JXL (up to 50 MB).
2. The compressor automatically targets 100 KB or under.
3. Download the compressed JXL — ready to use.

100 KB is a comfortable target for JXL — large enough to preserve quality on screen, small enough for fast delivery. The compressor prefers lossless mode when the source fits, otherwise iterates lossy quality.

100 KB is the most common upload cap across the web. Because JXL is already efficient, hitting 100 KB is usually easy — the compressor can preserve high quality (or stay lossless) at 100 KB for small-to-medium images. This is useful for forms, marketplaces, and any system with a 100 KB limit.

The compressor decodes the JXL and re-encodes it using libjxl. It first attempts lossless modular encoding; if the output exceeds 100 KB, it switches to lossy VarDCT and iteratively reduces quality until the target is met. At 100 KB, a JXL is typically 800-1200px wide with quality 80-90%.

• Website JXL image upload with a 100 KB cap.
• Storage optimization for JXL libraries.
• Email attachment (small enough to send quickly).
• Marketplace JXL image upload.
• Preparing JXL assets for delivery systems.
• Reducing JXL storage footprint.
• Any platform with a 100 KB JXL limit.

100 KB is comfortable for JXL — often achievable in lossless mode for small images, or lossy at 80-90% quality for larger ones. At 100 KB, the result is typically indistinguishable from the original on screens.

• 100 KB limits resolution — typically 800-1200px wide.
• Very large originals may require lossy mode.
• JXL browser support is limited (Chrome removed support in 2023).
• Not ideal for large-format print.
• For even higher quality, use the 500 KB variant.

• 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.
• Best for web delivery and archival.
• Standard JXL — no special software for storage use.

• 100 KB is the sweet spot for JXL on the web.
• Lossless mode is attempted first — quality is preserved when possible.
• Resize to the target display size before uploading.
• 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 100 KB

Crop or resize the image smaller first, or use the 500 KB variant.

Compression falls into lossy mode

Very large originals require lossy mode to hit 100 KB. For lossless results, use the 500 KB variant or the general JXL compressor.

Compression is slow

JXL encoding is CPU-intensive. Expect 3-5 seconds per image.

• JPEG XL — Official Specification