JPEG XL compression benchmarks

Dedicated to Luca and the JXL experts.

date	title	images	tags	commands	tables	source
2026-01-11	4 motus screenshots	4	2-color	23	4+1	PNG
2024-08-19	Quite e10.5	1239	58	2208+	3	stripped PNG
2024-05-17	Responsible? Computing!	777	70	136	74	stripped PNG
2024-05-06	Irresponsible! Computing?	1504	69	185	210	unoptimized or stripped PNG
2024-03-02	Irresponsible! Computing?	642	53	56+	10	PNG
2023-12-18	Irresponsible Computing	170	6	104+	7	optimized and stripped PNG
2023-11-21	Irresponsible Computing	147	5+1	118	1+1	optimized and stripped PNG
2023-10-22	someone_is_wrong_on_the_internet	264	pixel_art, scaled_pixel_art	56	1+1	optimized and stripped PNG
2023-09-23	not_quite_e9.5	171	pixel_art	56	1	optimized and stripped PNG
2023-09-16	irresponsible_computing	109	pixel_art	22	1	optimized and stripped PNG
2022-01-31	JPEG recompression	3684		4	1	optimized JPEG
2021-09-27	Lossless recommendations comparison	222	11	8	1	optimized PNG

"Let jixel store all your pixel." — Jyrki Alakuijala, creator of lossless WebP, not referencing this script

jixel - A bash script for high compression of scaled pixel art. Where possible, does lossless compression on the downscaled image signaling nearest neighbor upsampling, otherwise uses bester general parameters.

How to spell JPEG XL - a reference

Spellings used in practice are grouped at the top, others follow roughtly sorted by discovery. Pick your poison.

JPEG XL (canonical)
JXL
jxl
JPEG-XL
jpeg-xl (URL)
JPEG XL
jpeg xl
JPEGXL
jpegxl (URL)
JPegXL
XL
JpegXL (Irfanview error message)
JPEG_XL (URL, normalizing to space on MediaWiki-based sites [babylonas])
jpeg_xl (URL, Irfanview pluggin)
JPG XL
jpg XL
jpgxl
JPEG XL (HTML)

J P E G   \/ |
          /\ |_

(libjxl tool header)
PIK FUIF (original codec proposals and Dutch pun, extra large might be not about file sizes [afed_])
JPEG 40
extra light
JPEG extra large
jpeg extra large
JPEG eXtended Life
eXtended-Life
Jpeg eXtended Life
JXL eXtended Life (recursively [jyzg])
jpeg xtra large
Jpeg Xtra Light (for colors and filesize [jonnyawsom3])
JPEG Excellent
jpeg 2024
18181
JPGX
jpegXL
Jpeg_Xl
JxL
J.P.E.G. extra-large
JPG-XL
JpEgXl
jpEGxL
jPE-gX l
JP🥚-XL
JPGXL
JPXL
JPEG----XL
JPEG+XL (hypothetical Sony/Philips release [crushedasian255])
jpeg minus extra large
JPEG⸺XL
JPEG⸻XL
JPEG〜XL
JPEG〰〰〰〰〰〰XL
JPEG±XL
JPEG⁺∕₋XL
JPEG|XL
JPEG‾XL
JPEG‾‾‾‾‾‾‾XL
JPEG™XL

       /
‾| \/ |
 | /\ |_
/

_| >< |_

  _ __ ___  __    _  _ _
  | |_)|_  / __    \/  |
\_| |  |__ \_/    _/\_ |_/

   _ __ ___ _    _  _ _
   | |_)|_ / __   \/  |
(__| |  |__\__)  _/\_ |__)

JPEG¬XL (where ¬ is the logical not [_wb_], but that gives regular JPEG [babylonas])
JPEGXL
JPEG -v -v XL
$ jpeg --xl

J L J
 X X
L J L

jpeg -v -v -v -v xl
JPEG ███████
JPEG the fortieth
JPEG BAR
JPEG-XL (emphasis in criticism [bustycat])
JPEG×XL
JPEG/XL
JPEG 3.0 (JPEG 2000 being JP2 or JPEG version 2 [_wb_])
JPEG 8 (considering LS, LS 2, XT, XR, XS [_wb_], not to be confused with libjpeg 8 [spidermario])
guhnoo slash XL (XL being only one component of a complete GNU system [pashifox])
JPEG 0xL (malformed hexadecimal [_wb_])
JPEG × L
Jpg-Xl
JPEP XthqzxL (emulating generative image model)