01
Right-sized output for the use case
Converting from HDR to JXL aligns the file with the encoding choices the downstream pipeline expects. The result is a deliverable that fits naturally into the destination workflow.
100% local
IMAGE
Convert HDR
to JXL
Right-sized output for the use case.
Converting from HDR to JXL aligns the file with the encoding choices the downstream pipeline expects. The result is a deliverable that fits naturally into the destination workflow.
— Drop area
WHY CONVERT
Why convert HDR to JXL
02
Acceptance by downstream tools
JXL is the format most receiving systems expect for this kind of content. Converting upstream avoids the rejection and silent re-encoding that often happen when HDR reaches an unprepared pipeline.
03
Portable, predictable file format
JXL is well documented and decodable by long-lived tooling, which matters for archives, deliverables, and any file that needs to outlive the software that created it.
— How to convert
HDR to JXL in three steps.
- 01
Open LocalConvert
Visit this page on any modern browser — no install, no signup, no plugin.
- 02
Drop or select your HDR file
Drag your HDR into the drop area, or click to pick one from your device.
- 03
Click Convert
Conversion runs entirely in your browser. When it's done, your JXL file downloads to your device.
QUALITY & FIDELITY
Quality and fidelity
- Lossless to lossless: conversion is mathematically reversible in principle.
- Target supports alpha but the source has none, so the output is fully opaque.
- Metadata (EXIF/tags) is preserved where the source provides it.
- JXL can be lossy or lossless — switch modes for pixel-perfect output if needed.
Transparency HDR
✗ JXL
✓
Color depth 32-bit float RGB (HDR) 16-bit RGBA, HDR
Metadata preserved ✓
FORMAT SPECS
Format specifications
| HDR | JXL | |
|---|---|---|
| Extensions | .hdr .pic | .jxl |
| MIME types | image/vnd.radiance | image/jxl |
| Introduced | 1989 | 2021 |
| Maintainer | Radiance / Greg Ward | JPEG Group / ISO |
| Magic # | — | FF 0A |
| Spec | View spec ↗ | View spec ↗ |
Why LocalConvert
How LocalConvert compares
| Category | LocalConvert | Cloud converters |
|---|---|---|
| PRIVACY | Files never leave your device. The whole pipeline runs in your browser via WebAssembly. | Files travel to a remote server, sit in queue storage, and may be retained for analytics or moderation. |
| COST | Free, no signup, no daily quotas. | Often free for small files; paid tiers for batch / large / commercial use. |
| LIMITS | Limited only by your device's memory and CPU. Multi-GB files OK on desktop. | Typical 100 MB to 1 GB per-file caps, plus rate limits. |
— The formats
From · HDR
Radiance HDR
A high-dynamic-range raster format used in 3D rendering and HDR photography.
Typical uses
HDR photography, environment maps for 3D.
To · JXL
JPEG XL
A modern image format with state-of-the-art compression for both lossy and lossless workflows. Supports HDR and lossless JPEG transcoding.
Typical uses
Photography archives, web (where supported), future-proof storage.
— FAQ
Frequently asked.
Is HDR to JXL conversion free?
Yes. LocalConvert is completely free, with no signup and no per-file or per-day limits.
Do my files get uploaded anywhere?
No. HDR to JXL conversion happens entirely inside your browser using WebAssembly — your file never leaves your device.
What's the maximum file size?
There's no fixed cap — the practical limit is your device's available memory. Very large files may take longer or fail on low-RAM devices.
Does it work offline?
Yes — once the page has loaded, HDR to JXL conversion works without an internet connection. Re-open the page once to cache it.
Will conversion preserve quality?
LocalConvert uses the industry-standard tools (FFmpeg, ImageMagick, Pandoc) — quality matches what professionals use on the command line. Lossy formats will still lose some quality on each re-encode.
— Related
Or convert these.
Browse all conversionsREFERENCES
Format references
Last verified:
100% local conversion.
HDR to JXL is processed in your browser with WebAssembly. No upload, no tracking, no limits. Your file never leaves your device.