JXL Viewer Online

A web tool to view and analyze JPEG XL images, enabling quick previews, metadata extraction, and format comparisons for photographers, developers, and asset managers.

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About This Tool

The tool enables viewing and validating JPEG XL images by decoding a JXL file to a raster preview and extracting core metadata.
It supports color space inference, alpha channel presence, and embedded ICC profiles, allowing quick comparisons against PNG/JPEG formats.
Users can request a scaled preview and optional re-encoding to a different format for side-by-side validation, which helps asset managers and developers assess compression efficiency and visual fidelity before publication.
Conceptually, the system relies on a reference JXL decoder to ensure consistent results across environments, making it suitable for production pipelines that require deterministic decoding behavior and metadata access for cataloging and QA. The value lies in rapid verification, standardized color handling, and export options that support downstream workflows. Use cases include DAM QA, web-ready delivery, and format migration planning.

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How to Use

Upload a JPEG XL file (.jxl) to the input area.
Optionally set target_width and target_height (pixels) and choose an output_format (PNG/JXL).
Run decode to generate a raster preview and extract metadata.
Review the decoded_preview, color_space, bit_depth, and alpha presence; compare with other formats if needed.
Export the preview or metadata as PNG or JSON for integration into pipelines.

Frequently Asked Questions

Find Quick Answers

What file types does this tool support?

The tool accepts JPEG XL (.jxl) input files for decoding and preview generation. Non-JXL formats are rejected to prevent invalid parsing and ensure accurate metadata extraction.

Can I export the decoded image or metadata?

Yes. You can export a raster preview as PNG or re-encode data as JXL if requested, and you can export metadata in a structured JSON-like format for archival or pipeline integration.

What metadata is exposed?

The tool exposes color_space, bit_depth, alpha_presence, animation_flag, and embedded ICC profiles when present. If a piece of metadata is absent, the field remains empty or undefined in the output.

Is batch processing supported?

Batch processing is not available in the single-file UI workflow. API-level or enterprise integrations may enable multi-file processing in a separate plan.

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