DJXL(1)

💅 DJXL — like, the manual page bestie ✨

okay so welcome to djxl(1), the iconic little tool that unstuffs your JPEG XL files and hands you back a whole picture. it's giving decompression main character energy, and honestly? she ate. 🎀

🌸 NAME 🌸

djxl — decompress JPEG XL images. that's it, that's the vibe. 💖

✨ SYNOPSIS ✨

djxl [options...] input.jxl [output]

so you feed her an input.jxl, you maybe tell her where the output should go, and you sprinkle in some [options...] if you're feeling fancy. slay. 🦋

🫶 DESCRIPTION 🫶

okay so here's the tea, bestie: djxl decompresses a JPEG XL image or an animation. lowkey magic. ✨

the output format? not a mystery — it's literally decided by the extension of your output file. and the approved squad is .png, .jpg, .ppm, .pfm. no cap, those are the four. 💅

and here's the part where you gotta pay attention 👀 — if your JPEG XL input file contains an animation, you're not getting one file back, you're getting multiple output files. their names come out in this exact form:

output-framenumber.ext

so like, each frame gets its own little file with its number in there. iconic behaviour honestly. 🎬💖

🔥 OPTIONS 🔥

• -h, --help — shows you all the options that djxl supports. the "wait, what can you even do" button. 🫶
• -j, --pixels_to_jpeg — okay so here's the default situation first: if your input JPEG XL contains a recompressed JPEG file, djxl reconstructs the exact original JPEG file — but only when your output file has the .jpg (or .jpeg) filename extension. this flag switches that up: instead, the decoder decodes the image to pixels and encodes a new (lossy) JPEG. so yeah, no more exact-original situation, you're getting a fresh lossy one. 💀
• -q quality, --jpeg_quality=quality — when you're decoding to .jpg, this is the output quality you want. and heads up ⚠️ — this option implicitly enables the --pixels_to_jpeg option. so it comes as a package deal, iykyk. 🌈

⭐ EXAMPLES ⭐

decompress a JPEG XL file to PNG — the classic, the beloved:

# Decompress a JPEG XL file to PNG
$ djxl input.jxl output.png

reconstruct a losslessly-recompressed JPEG file — the exact-original flex:

# Reconstruct a losslessly-recompressed JPEG file
$ djxl lossless-jpeg.jxl reconstructed.jpeg

💜 SEE ALSO 💜

• cjxl(1) — her sibling, the one who does the compressing. go say hi. 👑

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okay that's the whole page, bestie — no notes, she's perfect. this was djxl(1), dated 05/28/2026, and yeah that's the whole manual. periodt. 💅✨🎀