JXL to PFM Converter
Processing entirely on your device — large files may take a moment.
JPEG XL Image and Portable Float Map exist for different jobs: JPEG XL is a next-generation format designed to succeed JPEG: it can recompress existing JPG files about 60% smaller with no additional quality loss, and supports lossless mode and animation. Convert PFM to PNG or JPG to get a viewable tone-mapped preview of float data.
Because the whole conversion happens on your device, it is instant, unlimited and genuinely private — no accounts, no watermarks, no files on anyone's server. Multiple files are converted in one go.
How JXL compares to PFM
| JXL | PFM | |
|---|---|---|
| Compression | Lossy and lossless | None (raw floats) |
| Transparency | Supported | Not supported |
| Animation | Supported | Not supported |
| Metadata | EXIF, ICC carried over | Minimal header only |
| Best for | Archival and JPEG migration | HDR interchange, render passes |
How to convert JXL to PFM
- 1
Select your files
Drag & drop your JXL files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Click "Convert to PFM". The conversion runs entirely inside your browser using WebAssembly — no upload, no queue, no waiting.
- 3
Download results
Download each converted PFM file individually, or grab everything at once as a ZIP archive.
About the JXL format
JPEG XL (JXL, standardized 2021–2022) is the format designed to actually replace JPEG rather than merely coexist with it. Its headline trick: an existing JPG can be transcoded into JXL losslessly, shrinking it about 20% with zero further quality loss and the option to restore the original bytes later. Fresh encodes are smaller still — roughly 35–50% below JPG at equal quality — with animation, alpha and up to 32-bit float HDR support.
Adoption is the open question. Google pulled JXL from Chrome in 2023 (keeping an origin-trial path), Safari supports it since 17, and the encoder community remains enthusiastic. Today it is a superb archival and pipeline format — a way to future-proof JPEG libraries — while web deployment remains a calculated bet.
+Strengths
- ✓Lossless JPEG transcode (~20% smaller) with byte-exact restore
- ✓35–50% smaller than JPG on fresh encodes
- ✓Modern feature set: alpha, animation, HDR
!Limitations
- −Browser support is incomplete (Chrome pulled it)
- −Ecosystem and tooling are still young
- −Encoding slower than JPG
About the PFM format
PFM (Portable Float Map) stores pixels as raw 32-bit floating-point values — no palette, no compression tricks, just the numbers. It belongs to the Netpbm family (PBM/PGM/PPM) and is the lingua franca for handing high-dynamic-range data between renderers, tone-mapping experiments and radiance research scripts.
Because the values are floats, a PFM can hold sunlight and candlelight in the same image without clipping. Viewers rarely open it directly: convert to PNG or JPG to get a tone-mapped preview of the same data.
+Strengths
- ✓Full floating-point precision
- ✓Dead-simple text/binary layout
- ✓Widely read by research tooling
!Limitations
- −Enormous files (16 bytes per pixel)
- −Almost no viewer support
Why convert JXL to PFM?
There is a concrete reason this conversion exists: Browser support is incomplete (Chrome pulled it) PFM sidesteps that — Full floating-point precision If that is your situation, the tool above settles it in seconds, entirely on your device.
Frequently asked questions
Is this JXL to PFM converter really free?
Yes — completely free, with no sign-up, no watermark and no daily conversion limits. The site is supported by advertising.
Are my files uploaded to a server?
No. The conversion runs entirely inside your browser using WebAssembly, so your files never leave your device — that is what makes it instant and private.
Does it work on Windows, Mac, iPhone and Android?
Yes. Anything with a modern browser works: Windows, macOS, Linux, Android and iOS. No software installation is required.
Will I lose quality converting JXL to PFM?
No — PFM is a lossless format, so every pixel of the converted image matches your original JXL file. You can also adjust the quality/size balance before converting when the target format supports compression.
What happens to EXIF data and other metadata?
Conversions here re-encode the image, and re-encoding generally does not carry the original metadata over. If the EXIF data of your JXL files matters (camera model, GPS, timestamps), keep the original file as the master and treat the converted copy as the shareable version.
Will transparent areas survive the conversion to PFM?
Transparency is kept whenever PFM actually supports an alpha channel. If the target format has none (like JPG), transparent areas are flattened onto a white background — that is a property of the format, not of this tool.