Dojo 1.13.9 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 637378 bytes (622.4k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 167362 bytes (163.4k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	56244 bytes (54.9k)	local copy
gzip -9	56182 bytes (54.9k)	local copy
libdeflate -12	53516 bytes (52.3k)	local copy
7zip -mx=9 -tgzip	53515 bytes (52.3k)	local copy
kzip -s0 -rn -b1	53449 bytes (52.2k)	local copy
zultra	53445 bytes (52.2k)	local copy
pigz -11 -n	53410 bytes (52.2k)	local copy
Zopfli	53352 bytes (52.1k)	local copy
Zopfli (defluff)	53351 bytes (52.1k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.13.9.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.13.9 file, ETag caching is available and
if your browser doesn't support GZIP decompression then the uncompressed version will be sent.

Currently best Zopfli settings

You can use my super-compressed files for whatever purpose you like as long as you respect the library's original license agreement.
There are no restrictions from my side - but please avoid hot-linking if you run a high-traffic website.

These command-line settings yielded the best compression ratio so far (Linux version of zopfli-krzymod):
zopfli --i1000000 --mb8 --mls128 --bsr18 --lazy --ohh

(found March 10, 2022)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	128	--mls128
block splitting recursion	18	--bsr18
lazy matching in LZ77	yes	--lazy
optimized Huffman headers	yes	--ohh
initial random W for iterations	1	--rw1
initial random Z for iterations	2	--rz2

Even Smaller Files Thanks To Defluff

Zopfli's output can be further optimized by the defluff tool.
In this particular case, defluff saves 1 more byte (53351 bytes).

Download

Verify file integrity

After decompression, my uncompressed files are identical to the original ones:

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.13.9/dojo.js --location | md5sum
c323ac79fad98f36c2df5bbd5ae13516 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.9.min.zopfli.js.gz | md5sum
c323ac79fad98f36c2df5bbd5ae13516 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.13.9/dojo.js --location | sha1sum
62f7ff6bb79b3287fafb72b9126fe4ecf32836ff -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.9.min.zopfli.js.gz | sha1sum
62f7ff6bb79b3287fafb72b9126fe4ecf32836ff -

Other Versions

Available Dojo versions at minime.stephan-brumme.com:

1.17.3, 1.17.2, 1.17.1, 1.17.0,
1.16.5, 1.16.4, 1.16.3, 1.16.2, 1.16.1, 1.16.0,
1.15.6, 1.15.5, 1.15.4, 1.15.3, 1.15.2, 1.15.1, 1.15.0,
1.14.9, 1.14.8, 1.14.7, 1.14.6, 1.14.5, 1.14.4, 1.14.3, 1.14.2, 1.14.1, 1.14.0,
1.13.10, 1.13.9, 1.13.8, 1.13.7, 1.13.6, 1.13.5, 1.13.4, 1.13.3, 1.13.2, 1.13.1, 1.13.0,
1.12.11, 1.12.10, 1.12.9, 1.12.8, 1.12.7, 1.12.6, 1.12.5, 1.12.4, 1.12.3, 1.12.2, 1.12.1,
1.11.13, 1.11.12, 1.11.11, 1.11.10, 1.11.9, 1.11.8, 1.11.7, 1.11.6, 1.11.5, 1.11.4, 1.11.3, 1.11.2, 1.11.1, 1.11.0,
1.10.10, 1.10.9, 1.10.8, 1.10.7, 1.10.6, 1.10.5, 1.10.4, 1.10.3, 1.10.2, 1.10.1, 1.10.0,
1.9.11, 1.9.10, 1.9.9, 1.9.8, 1.9.7, 1.9.6, 1.9.5, 1.9.4, 1.9.3, 1.9.2, 1.9.1, 1.9.0,
1.8.14, 1.8.13, 1.8.12, 1.8.11, 1.8.10, 1.8.9, 1.8.8, 1.8.7, 1.8.6, 1.8.5, 1.8.4, 1.8.3, 1.8.2, 1.8.1, 1.8.0,
1.7.12, 1.7.11, 1.7.10, 1.7.9, 1.7.8, 1.7.7, 1.7.6, 1.7.5, 1.7.4, 1.7.3, 1.7.2, 1.7.1, 1.7.0,
1.6.5, 1.6.4, 1.6.3, 1.6.2, 1.6.1, 1.6.0,
1.5.6, 1.5.5, 1.5.4, 1.5.3, 1.5.2, 1.5.1, 1.5.0,
1.4.8, 1.4.7, 1.4.6, 1.4.5, 1.4.4, 1.4.3, 1.4.2, 1.4.1, 1.4.0,
1.3.3, 1.3.2, 1.3.1, 1.3.0,
1.2.3, 1.2.2

The project site contains an overview how well these versions were compressed.
Other interesting projects are AngularJS, BackboneJS, Bootstrap, D3, Ember, jQuery, Knockout, lodash, React, Socket.IO, ThreeJS, UnderscoreJS and Vue.

Changelog

Best Zopfli parameters so far:

Size	Improvement	Parameters	Found
53352 bytes	-1 byte	zopfli --i1000000 --mls128 --bsr18 --lazy --ohh	March 10, 2022 @ 05:35
53353 bytes	-1 byte	zopfli --i100000 --mls8 --bsr25 --lazy --ohh	March 4, 2022 @ 12:48
53354 bytes	-1 byte	zopfli --i10000 --mls8 --bsr25 --lazy --ohh	February 26, 2022 @ 02:00
53355 bytes	-1 byte	zopfli --i10000 --mls32 --bsr23 --lazy --ohh	February 25, 2022 @ 17:29
53356 bytes	-1 byte	zopfli --i10000 --mls2 --bsr14 --lazy --ohh	February 25, 2022 @ 12:12
53357 bytes	-8 bytes	zopfli --i10000 --mls2 --bsr8 --lazy --ohh	February 25, 2022 @ 09:15
53365 bytes	-1 byte	zopfli --i1000 --mls4 --bsr9 --lazy --ohh	February 24, 2022 @ 20:38
53366 bytes	-1 byte	zopfli --i1000 --mls8 --bsr10 --lazy --ohh	February 24, 2022 @ 18:10
53367 bytes	–	zopfli --i100 --mls4 --bsr9 --lazy --ohh	February 24, 2022 @ 15:43

If there are multiple parameter sets yielding the same compressed size, only the first one found is shown.

Most recent activity on March 10, 2022 @ 17:25.

Heatmaps

This Zopfli heatmap visualizes how compression changes when modifying the --bsr and --mls parameter.
Cell's contents is the best filesize achieved (in bytes, hover with mouse over cells to see number of iterations).

Good parameters are green, bad are red. The best and worst are bold as well.
The brightness of the blue background color indicates how many iterations were processed:
10,000, 100,000 or 1,000,000.

bsr \ mls	2	4	8	16	32	64	128	256	512	1024	2048	4096	8192	16384	32768
bsr \ mls	2	4	8	16	32	64	128	256	512	1024	2048	4096	8192	16384	32768
2	53357	53367	53357	53365	53364	53364	53362	53357	53356	53365	53379	53379	53375	53387	53398
4	53386	53384	53359	53363	53366	53369	53366	53364	53369	53365	53369	53374	53367	53373	53374
6	53399	53357	53361	53365	53357	53363	53361	53367	53369	53364	53366	53373	53369	53372	53370
7	53386	53402	53365	53368	53363	53375	53361	53373	53366	53363	53367	53365	53367	53374	53369
8	53357	53385	53364	53358	53360	53373	53357	53361	53380	53385	53371	53375	53368	53372	53369
9	53385	53360	53357	53363	53362	53361	53363	53361	53365	53364	53374	53370	53364	53371	53366
10	53356	53363	53362	53374	53367	53371	53362	53362	53371	53367	53386	53373	53370	53372	53363
11	53388	53384	53359	53359	53365	53372	53361	53354	53366	53367	53386	53375	53370	53376	53373
12	53383	53384	53363	53390	53365	53367	53357	53360	53366	53380	53370	53371	53364	53374	53372
13	53387	53397	53364	53366	53358	53369	53363	53365	53365	53385	53370	53373	53375	53375	53366
14	53356	53365	53361	53391	53360	53377	53363	53362	53365	53367	53369	53371	53367	53370	53379
15	53389	53393	53362	53366	53367	53362	53361	53365	53371	53358	53372	53374	53374	53373	53368
16	53381	53394	53361	53356	53355	53370	53364	53367	53366	53364	53370	53368	53374	53370	53371
17	53384	53381	53367	53357	53366	53376	53362	53361	53366	53384	53369	53372	53368	53371	53365
18	53385	53395	53361	53363	53355	53368	53352	53362	53366	53368	53366	53373	53367	53369	53368
19	53392	53389	53363	53357	53355	53378	53361	53361	53373	53385	53370	53369	53369	53368	53362
20	53393	53383	53364	53356	53366	53367	53366	53365	53366	53370	53387	53371	53366	53367	53370
21	53382	53385	53357	53357	53363	53378	53365	53356	53366	53364	53370	53369	53366	53368	53366
22	53387	53389	53365	53357	53361	53373	53361	53361	53369	53364	53389	53371	53369	53368	53368
23	53389	53397	53364	53358	53355	53375	53362	53360	53371	53363	53371	53371	53369	53368	53364
25	53387	53384	53352	53358	53365	53363	53365	53360	53366	53385	53374	53373	53364	53373	53372
30	53394	53385	53364	53358	53367	53369	53364	53362	53365	53385	53384	53372	53367	53367	53368
40	53385	53361	53358	53365	53356	53369	53363	53363	53371	53363	53369	53370	53370	53368	53371

Due to the Monte Carlo design of my search algorithm, not all parameters have reached the same number of iterations yet:

Iterations	Min. Bytes	Reduction	Coverage
100	53367 bytes	–	100%
1,000	53365 bytes	-2 bytes	100%
10,000	53354 bytes	-11 bytes	100%
100,000	53353 bytes	-1 byte	2.90%
1,000,000	53352 bytes	-1 byte	0.58%
10,000,000	–	–	–

KZIP has far less options available for tuning/optimization. I only played around with the number of blocks (parameter -n):

Blocks	Min. Bytes	Compared To Best Zopfli	Compared To Best KZIP
(any)	53524 bytes	+172 bytes (+0.32%)	+75 bytes
1	53449 bytes	+97 bytes (+0.18%)	–
2	53475 bytes	+123 bytes (+0.23%)	+26 bytes
3	53488 bytes	+136 bytes (+0.25%)	+39 bytes
4	53527 bytes	+175 bytes (+0.33%)	+78 bytes
5	53543 bytes	+191 bytes (+0.36%)	+94 bytes
6	53582 bytes	+230 bytes (+0.43%)	+133 bytes
7	53605 bytes	+253 bytes (+0.47%)	+156 bytes
8	53590 bytes	+238 bytes (+0.45%)	+141 bytes

Non-DEFLATE Algorithms

Archivers based on completely different compression algorithms often produce superior results.
Unfortunately, browsers only support gzip compression at the moment.
However, support for Brotli is constantly growing - for example, your browser actually supports it !

Algorithm	Program	Parameters	Size	Compared To Best Zopfli
ZPAQ (Wikipedia)	zpaq	zpaq -method 69	39200 bytes	-14152 bytes (-26.53%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46823 bytes	-6529 bytes (-12.24%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47804 bytes	-5548 bytes (-10.40%)
Brotli (Wikipedia)	brotli	brotli -q 11	49230 bytes	-4122 bytes (-7.73%)
LZMA2 (Wikipedia)	xz	xz -9	50368 bytes	-2984 bytes (-5.59%)
Zstandard (Wikipedia)	zstd	zstd -19	51666 bytes	-1686 bytes (-3.16%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	52024 bytes	-1328 bytes (-2.49%)

Detailled Analysis

I wrote a DEFLATE decoder in Javascript. Click the button below to start a client-side analysis of the smallest gzipped files (may take a second):

Load and Parse Data

Notes: pigz is a fast open source multi-threaded implementation of gzip written by one of the original authors of gzip.
However, when using compression level 11, pigz actually switches to the slower Zopfli algorithm and isn't multi-threaded anymore.
KrzyMOD's extensions to Zopfli offer the highest level of configuration and is therefore used for my brute-force search.
Ken Silverman wrote the closed-source KZIP compression program and Jonathon Fowler ported it to Linux.
Defluff was created by Joachim Henke; DeflOpt is a tool by Ben Jos Walbeehm.

website made by Stephan Brumme in 2015 and still improving in 2026.
all timestamps are displayed in central european time. see my changelog.
no flash, not even images or external css files - and everything squeezed into a single html file.
which was handsomely compressed before releasing it into the wild internet - obviously.

please visit my homepage and my blog, too.
email: minime (at) stephan-brumme.com

All trademarks are property of their respective owners. You know, the boring legal stuff.