Dojo 1.11.9 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 633440 bytes (618.6k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 165863 bytes (162.0k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	55940 bytes (54.6k)	local copy
gzip -9	55892 bytes (54.6k)	local copy
libdeflate -12	53247 bytes (52.0k)	local copy
7zip -mx=9 -tgzip	53222 bytes (52.0k)	local copy
pigz -11 -n	53153 bytes (51.9k)	local copy
kzip -s0 -rn -b1	53148 bytes (51.9k)	local copy
zultra	53147 bytes (51.9k)	local copy
Zopfli	53054 bytes (51.8k)	local copy
Zopfli (defluff)	53053 bytes (51.8k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.11.9.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.11.9 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 --mls4 --bsr18 --lazy --ohh

(found March 10, 2022)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	4	--mls4
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 (53053 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-1.11.9/dojo.js --location | md5sum
1673eda9a7f5d8df246d0bb68254e756 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.11.9.min.zopfli.js.gz | md5sum
1673eda9a7f5d8df246d0bb68254e756 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.11.9/dojo.js --location | sha1sum
34ad10a71ce4f5c2d8ad2d8bf36d4203e4e2c822 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.11.9.min.zopfli.js.gz | sha1sum
34ad10a71ce4f5c2d8ad2d8bf36d4203e4e2c822 -

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
53054 bytes	-1 byte	zopfli --i1000000 --mls4 --bsr18 --lazy --ohh	March 10, 2022 @ 05:24
53055 bytes	-7 bytes	zopfli --i100000 --mls8 --bsr40 --lazy --ohh	March 4, 2022 @ 21:08
53062 bytes	-1 byte	zopfli --i10000 --mls8 --bsr40 --lazy --ohh	March 1, 2022 @ 00:47
53063 bytes	-1 byte	zopfli --i10000 --mls4 --bsr21 --lazy --ohh	February 27, 2022 @ 12:10
53064 bytes	-1 byte	zopfli --i10000 --mls2 --bsr8 --lazy --ohh	February 25, 2022 @ 20:05
53065 bytes	-2 bytes	zopfli --i10000 --mls2 --bsr13 --lazy --ohh	February 25, 2022 @ 08:25
53067 bytes	-1 byte	zopfli --i1000 --mls8 --bsr14 --lazy --ohh	February 24, 2022 @ 18:49
53068 bytes	-1 byte	zopfli --i1000 --mls256 --bsr10 --lazy --ohh	February 24, 2022 @ 17:09
53069 bytes	–	zopfli --i100 --mls4 --bsr40 --lazy --ohh	February 24, 2022 @ 15:11

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 @ 18:57.

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	53066	53066	53067	53067	53067	53068	53067	53067	53068	53067	53069	53069	53077	53093	53079
4	53082	53065	53065	53066	53075	53070	53063	53065	53071	53075	53075	53069	53077	53079	53074
6	53095	53065	53066	53067	53071	53067	53065	53067	53072	53087	53083	53075	53076	53076	53077
7	53100	53063	53069	53102	53064	53064	53066	53069	53073	53066	53077	53069	53080	53086	53075
8	53064	53054	53063	53066	53067	53066	53063	53065	53072	53078	53077	53067	53077	53077	53076
9	53065	53063	53065	53065	53069	53068	53066	53066	53071	53086	53076	53067	53078	53077	53074
10	53098	53064	53064	53069	53079	53063	53078	53065	53072	53076	53078	53067	53079	53073	53079
11	53100	53054	53064	53066	53069	53067	53063	53063	53073	53075	53076	53075	53074	53082	53073
12	53099	53064	53065	53069	53069	53068	53056	53064	53072	53075	53067	53075	53078	53070	53079
13	53065	53066	53065	53064	53067	53063	53066	53064	53072	53074	53077	53065	53074	53084	53075
14	53063	53064	53056	53071	53070	53069	53066	53067	53072	53077	53077	53074	53074	53086	53073
15	53096	53063	53056	53069	53067	53067	53056	53073	53073	53075	53077	53067	53076	53086	53082
16	53066	53064	53064	53064	53063	53069	53065	53076	53073	53075	53071	53068	53073	53075	53074
17	53064	53064	53071	53064	53065	53067	53063	53073	53073	53088	53077	53067	53077	53074	53081
18	53099	53054	53064	53066	53065	53063	53066	53072	53073	53077	53089	53075	53074	53076	53076
19	53098	53063	53066	53069	53079	53067	53066	53065	53071	53075	53070	53067	53074	53084	53076
20	53100	53063	53064	53069	53069	53064	53063	53073	53073	53077	53070	53073	53075	53074	53075
21	53099	53063	53065	53064	53065	53065	53066	53066	53072	53088	53077	53069	53074	53075	53082
22	53092	53063	53066	53069	53069	53063	53066	53073	53072	53075	53071	53066	53073	53082	53075
23	53099	53064	53064	53066	53066	53066	53064	53073	53072	53076	53074	53068	53078	53090	53072
25	53098	53063	53066	53065	53065	53063	53064	53072	53072	53083	53071	53068	53074	53089	53077
30	53094	53063	53067	53069	53070	53063	53064	53065	53073	53075	53071	53068	53075	53087	53074
40	53094	53054	53055	53064	53065	53063	53068	53072	53073	53075	53077	53074	53082	53075	53082

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	53069 bytes	–	100%
1,000	53067 bytes	-2 bytes	100%
10,000	53062 bytes	-5 bytes	100%
100,000	53055 bytes	-7 bytes	2.61%
1,000,000	53054 bytes	-1 byte	1.45%
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)	53206 bytes	+152 bytes (+0.29%)	+58 bytes
1	53148 bytes	+94 bytes (+0.18%)	–
2	53159 bytes	+105 bytes (+0.20%)	+11 bytes
3	53197 bytes	+143 bytes (+0.27%)	+49 bytes
4	53215 bytes	+161 bytes (+0.30%)	+67 bytes
5	53243 bytes	+189 bytes (+0.36%)	+95 bytes
6	53299 bytes	+245 bytes (+0.46%)	+151 bytes
7	53331 bytes	+277 bytes (+0.52%)	+183 bytes
8	53343 bytes	+289 bytes (+0.54%)	+195 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	38989 bytes	-14065 bytes (-26.51%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46546 bytes	-6508 bytes (-12.27%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47417 bytes	-5637 bytes (-10.63%)
Brotli (Wikipedia)	brotli	brotli -q 11	48919 bytes	-4135 bytes (-7.79%)
LZMA2 (Wikipedia)	xz	xz -9	50044 bytes	-3010 bytes (-5.67%)
Zstandard (Wikipedia)	zstd	zstd -19	51377 bytes	-1677 bytes (-3.16%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	51790 bytes	-1264 bytes (-2.38%)

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.