Dojo 1.9.11 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 625176 bytes (610.5k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 162159 bytes (158.4k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	54801 bytes (53.5k)	local copy
gzip -9	54754 bytes (53.5k)	local copy
libdeflate -12	52093 bytes (50.9k)	local copy
7zip -mx=9 -tgzip	52075 bytes (50.9k)	local copy
pigz -11 -n	52066 bytes (50.8k)	local copy
zultra	52051 bytes (50.8k)	local copy
kzip -s0 -rn -b1	52033 bytes (50.8k)	local copy
Zopfli	51952 bytes (50.7k)	local copy
Zopfli (defluff)	51951 bytes (50.7k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.9.11.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.9.11 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 --mls2048 --bsr16 --lazy --ohh

(found January 30, 2020)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	2048	--mls2048
block splitting recursion	16	--bsr16
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 (51951 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-1.9.11/dojo.js --location | md5sum
bb9d71434323e78f23e950cbc18b7e52 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.9.11.min.zopfli.js.gz | md5sum
bb9d71434323e78f23e950cbc18b7e52 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.9.11/dojo.js --location | sha1sum
151a9d3830a5dfa501797d9bacfc84668afb6ac0 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.9.11.min.zopfli.js.gz | sha1sum
151a9d3830a5dfa501797d9bacfc84668afb6ac0 -

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
51952 bytes	-2 bytes	zopfli --i1000000 --mls2048 --bsr16 --lazy --ohh	January 30, 2020 @ 08:05
51954 bytes	-3 bytes	zopfli --i100000 --mls2048 --bsr16 --lazy --ohh	March 21, 2017 @ 15:15
51957 bytes	-1 byte	zopfli --i100000 --mls2048 --bsr30 --lazy --ohh	March 21, 2017 @ 14:15
51958 bytes	-1 byte	zopfli --i10000 --mls2048 --bsr30 --lazy --ohh	March 17, 2017 @ 14:25
51959 bytes	-1 byte	zopfli --i10000 --mls16 --bsr11 --lazy --ohh	March 17, 2017 @ 04:22
51960 bytes	-4 bytes	zopfli --i10000 --mls64 --bsr8 --lazy --ohh	March 17, 2017 @ 03:14
51964 bytes	-1 byte	zopfli --i1000 --mls32 --bsr18 --lazy --ohh	March 17, 2017 @ 00:17
51965 bytes	-4 bytes	zopfli --i1000 --mls16 --bsr9 --lazy --ohh	March 17, 2017 @ 00:10
51969 bytes	–	zopfli --i100 --mls16 --bsr30 --lazy --ohh	March 11, 2017 @ 05:04

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

Most recent activity on July 20, 2020 @ 12:47.

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	51965	51964	51969	51967	51965	51967	51962	51962	51981	51980	51981	51978	51981	51981	51983
4	51976	51971	51963	51963	51962	51976	51970	51969	51966	51976	51965	51973	51972	51975	51967
6	51972	51971	51971	51964	51974	51961	51965	51965	51967	51973	51966	51972	51978	51981	51979
7	51973	51971	51976	51993	51965	51959	51967	51963	51960	51972	51963	51973	51975	51971	51977
8	51971	51974	51972	51959	51959	51960	51962	51977	51971	51977	51971	51977	51971	51972	51971
9	51961	51964	51960	51959	51964	51964	51963	51963	51967	51971	51963	51979	51977	51965	51974
10	51963	51971	51960	51964	51963	51965	51962	51962	51967	51976	51963	51974	51977	51972	51971
11	51962	51964	51964	51959	51962	51961	51965	51963	51960	51971	51963	51970	51975	51985	51971
12	51964	51963	51961	51960	51963	51959	51964	51963	51966	51971	51967	51973	51978	51966	51972
13	51974	51971	51970	51960	51960	51973	51961	51972	51966	51970	51955	51971	51970	51970	51980
14	51961	51963	51960	51959	51960	51960	51965	51960	51962	51967	51963	51971	51977	51969	51981
15	51973	51971	51962	51960	51963	51973	51960	51970	51961	51973	51963	51972	51973	51969	51976
16	51970	51971	51973	51963	51962	51963	51964	51971	51966	51968	51952	51972	51977	51965	51974
17	51962	51971	51960	51959	51961	51962	51962	51960	51966	51979	51963	51972	51977	51965	51968
18	51971	51970	51971	51959	51960	51974	51962	51972	51966	51978	51964	51973	51975	51970	51974
19	51972	51971	51971	51962	51965	51965	51963	51972	51965	51970	51965	51972	51977	51966	51971
20	51962	51971	51963	51959	51960	51961	51961	51962	51972	51971	51963	51971	51976	51970	51964
21	51962	51963	51960	51961	51962	51962	51961	51964	51965	51971	51963	51973	51969	51971	51971
22	51970	51971	51961	51959	51963	51975	51965	51970	51967	51972	51967	51978	51970	51970	51964
23	51961	51972	51971	51965	51960	51963	51966	51961	51966	51973	51963	51970	51976	51966	51972
25	51971	51973	51973	51959	51962	51962	51965	51969	51961	51977	51972	51971	51976	51979	51972
30	51959	51963	51971	51959	51963	51960	51964	51972	51962	51972	51957	51971	51977	51981	51981
40	51974	51969	51961	51960	51963	51962	51961	51966	51960	51974	51963	51971	51977	51971	51973

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	51969 bytes	–	100%
1,000	51964 bytes	-5 bytes	100%
10,000	51958 bytes	-6 bytes	100%
100,000	51954 bytes	-4 bytes	0.87%
1,000,000	51952 bytes	-2 bytes	0.29%
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)	52103 bytes	+151 bytes (+0.29%)	+70 bytes
1	52033 bytes	+81 bytes (+0.16%)	–
2	52035 bytes	+83 bytes (+0.16%)	+2 bytes
3	52071 bytes	+119 bytes (+0.23%)	+38 bytes
4	52093 bytes	+141 bytes (+0.27%)	+60 bytes
5	52141 bytes	+189 bytes (+0.36%)	+108 bytes
6	52168 bytes	+216 bytes (+0.42%)	+135 bytes
7	52189 bytes	+237 bytes (+0.46%)	+156 bytes
8	52188 bytes	+236 bytes (+0.45%)	+155 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	38340 bytes	-13612 bytes (-26.20%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	45675 bytes	-6277 bytes (-12.08%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	46582 bytes	-5370 bytes (-10.34%)
Brotli (Wikipedia)	brotli	brotli -q 11	47933 bytes	-4019 bytes (-7.74%)
LZMA2 (Wikipedia)	xz	xz -9	49056 bytes	-2896 bytes (-5.57%)
Zstandard (Wikipedia)	zstd	zstd -19	50515 bytes	-1437 bytes (-2.77%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	50720 bytes	-1232 bytes (-2.37%)

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.