Dojo 1.13.8 - 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
7zip -mx=9 -tgzip	53518 bytes (52.3k)	local copy
libdeflate -12	53513 bytes (52.3k)	local copy
zultra	53445 bytes (52.2k)	local copy
kzip -s0 -rn -b1	53444 bytes (52.2k)	local copy
pigz -11 -n	53411 bytes (52.2k)	local copy
Zopfli	53353 bytes (52.1k)	local copy
Zopfli (defluff)	53350 bytes (52.1k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.13.8.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.13.8 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 --mls256 --bsr21 --lazy --ohh

(found March 12, 2022)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	256	--mls256
block splitting recursion	21	--bsr21
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 3 more bytes (53350 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-1.13.8/dojo.js --location | md5sum
043eb626777eec11fc182d5458b78f5d -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.8.min.zopfli.js.gz | md5sum
043eb626777eec11fc182d5458b78f5d -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.13.8/dojo.js --location | sha1sum
56fbbdfbf71442eb3335afe539b3a7cd910b5b66 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.8.min.zopfli.js.gz | sha1sum
56fbbdfbf71442eb3335afe539b3a7cd910b5b66 -

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
53353 bytes	-1 byte	zopfli --i1000000 --mls256 --bsr21 --lazy --ohh	March 12, 2022 @ 03:02
53354 bytes	-1 byte	zopfli --i100000 --mls16 --bsr16 --lazy --ohh	March 5, 2022 @ 13:01
53355 bytes	-1 byte	zopfli --i100000 --mls8 --bsr6 --lazy --ohh	March 4, 2022 @ 18:31
53356 bytes	-1 byte	zopfli --i10000 --mls8 --bsr6 --lazy --ohh	February 25, 2022 @ 14:38
53357 bytes	-3 bytes	zopfli --i10000 --mls16 --bsr20 --lazy --ohh	February 25, 2022 @ 14:01
53360 bytes	-1 byte	zopfli --i10000 --mls8 --bsr19 --lazy --ohh	February 25, 2022 @ 11:40
53361 bytes	-1 byte	zopfli --i10000 --mls2 --bsr14 --lazy --ohh	February 25, 2022 @ 10:02
53362 bytes	-1 byte	zopfli --i10000 --mls8 --bsr8 --lazy --ohh	February 25, 2022 @ 09:57
53363 bytes	-2 bytes	zopfli --i10000 --mls128 --bsr13 --lazy --ohh	February 25, 2022 @ 04:55
53365 bytes	-2 bytes	zopfli --i1000 --mls4 --bsr9 --lazy --ohh	February 24, 2022 @ 18:37
53367 bytes	-1 byte	zopfli --i1000 --mls32 --bsr19 --lazy --ohh	February 24, 2022 @ 17:12
53368 bytes	–	zopfli --i100 --mls4 --bsr9 --lazy --ohh	February 24, 2022 @ 16:09

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

Most recent activity on March 14, 2022 @ 11:34.

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	53358	53367	53358	53365	53363	53363	53362	53357	53357	53364	53377	53383	53380	53386	53398
4	53396	53387	53365	53359	53366	53368	53366	53362	53367	53366	53369	53376	53374	53374	53368
6	53399	53357	53355	53359	53358	53360	53361	53374	53369	53359	53369	53374	53371	53375	53367
7	53387	53400	53363	53360	53363	53376	53361	53371	53371	53364	53366	53364	53367	53375	53369
8	53363	53384	53362	53358	53364	53373	53362	53357	53373	53385	53371	53376	53368	53371	53369
9	53388	53360	53358	53363	53366	53362	53363	53362	53370	53365	53373	53372	53369	53371	53366
10	53362	53383	53355	53375	53367	53372	53362	53362	53365	53372	53389	53376	53365	53370	53368
11	53390	53384	53355	53359	53366	53372	53361	53356	53371	53372	53386	53377	53370	53377	53373
12	53385	53385	53360	53391	53366	53366	53361	53361	53370	53381	53370	53376	53364	53375	53367
13	53388	53397	53362	53360	53359	53370	53363	53364	53370	53384	53371	53373	53370	53374	53366
14	53361	53365	53362	53390	53365	53376	53362	53362	53365	53367	53370	53371	53370	53377	53404
15	53381	53393	53362	53361	53367	53362	53361	53363	53365	53365	53367	53374	53375	53375	53369
16	53381	53394	53355	53354	53360	53369	53362	53368	53372	53365	53374	53368	53373	53374	53366
17	53384	53381	53365	53357	53366	53376	53362	53361	53371	53384	53373	53374	53369	53370	53369
18	53386	53392	53362	53358	53360	53368	53361	53363	53370	53368	53371	53373	53370	53368	53369
19	53394	53388	53360	53357	53360	53385	53361	53362	53371	53384	53374	53372	53364	53369	53369
20	53393	53383	53361	53357	53366	53366	53366	53365	53370	53370	53388	53376	53366	53371	53364
21	53383	53385	53358	53357	53365	53378	53362	53353	53371	53364	53373	53372	53366	53370	53371
22	53388	53387	53363	53357	53361	53373	53361	53363	53370	53364	53389	53373	53370	53367	53368
23	53390	53397	53362	53363	53360	53377	53361	53361	53369	53364	53376	53373	53370	53366	53368
25	53386	53383	53357	53363	53357	53364	53369	53361	53373	53385	53372	53374	53368	53373	53367
30	53395	53390	53363	53358	53369	53369	53362	53363	53370	53384	53387	53373	53370	53366	53363
40	53387	53362	53358	53363	53360	53369	53363	53363	53365	53364	53369	53372	53375	53368	53366

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	53368 bytes	–	100%
1,000	53365 bytes	-3 bytes	100%
10,000	53356 bytes	-9 bytes	100%
100,000	53354 bytes	-2 bytes	3.19%
1,000,000	53353 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)	53520 bytes	+167 bytes (+0.31%)	+76 bytes
1	53444 bytes	+91 bytes (+0.17%)	–
2	53471 bytes	+118 bytes (+0.22%)	+27 bytes
3	53500 bytes	+147 bytes (+0.28%)	+56 bytes
4	53514 bytes	+161 bytes (+0.30%)	+70 bytes
5	53542 bytes	+189 bytes (+0.35%)	+98 bytes
6	53590 bytes	+237 bytes (+0.44%)	+146 bytes
7	53586 bytes	+233 bytes (+0.44%)	+142 bytes
8	53588 bytes	+235 bytes (+0.44%)	+144 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	-14153 bytes (-26.53%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46824 bytes	-6529 bytes (-12.24%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47803 bytes	-5550 bytes (-10.40%)
Brotli (Wikipedia)	brotli	brotli -q 11	49286 bytes	-4067 bytes (-7.62%)
LZMA2 (Wikipedia)	xz	xz -9	50356 bytes	-2997 bytes (-5.62%)
Zstandard (Wikipedia)	zstd	zstd -19	51669 bytes	-1684 bytes (-3.16%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	51823 bytes	-1530 bytes (-2.87%)

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.