Choose a version:
25% The original file has 566246 bytes (553.0k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 141053 bytes (137.7k, 25%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  48295 bytes (47.2k)
 local copy
gzip -9
  48258 bytes (47.1k)
 local copy
7zip -mx=9 -tgzip
  46002 bytes (44.9k)
 local copy
libdeflate -12
  45944 bytes (44.9k)
 local copy
kzip -s0 -rn -b1
  45911 bytes (44.8k)
 local copy
pigz -11 -n
  45898 bytes (44.8k)
 local copy
zultra
  45866 bytes (44.8k)
 local copy
Zopfli
  45809 bytes (44.7k)
 local copy
Zopfli (defluff)
  45806 bytes (44.7k)
 local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.7.11.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.7.11 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 --mls16384 --bsr10 --lazy --ohh

(found October 5, 2018)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 16384  --mls16384
block splitting recursion 10  --bsr10
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 (45806 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-1.7.11/dojo.js --location | md5sum
f1e60be7c150ac989d1635c6f42c3615  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.7.11.min.zopfli.js.gz | md5sum
f1e60be7c150ac989d1635c6f42c3615  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.7.11/dojo.js --location | sha1sum
4cbf84b155517140a2ffe44fc9fc251b2bef349f  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.7.11.min.zopfli.js.gz | sha1sum
4cbf84b155517140a2ffe44fc9fc251b2bef349f  -

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
45809 bytes -1 byte zopfli --i1000000 --mls16384 --bsr10 --lazy --ohh October 5, 2018 @ 03:59
45810 bytes -2 bytes zopfli --i100000 --mls16384 --bsr10 --lazy --ohh October 4, 2018 @ 22:11
45812 bytes -2 bytes zopfli --i100000 --mls4 --bsr10 --lazy --ohh October 4, 2018 @ 12:12
45814 bytes -4 bytes zopfli --i10000 --mls4 --bsr10 --lazy --ohh October 3, 2018 @ 01:16
45818 bytes -4 bytes zopfli --i10000 --mls4 --bsr30 --lazy --ohh October 3, 2018 @ 01:10
45822 bytes -1 byte zopfli --i1000 --mls32 --bsr12 --lazy --ohh October 2, 2018 @ 19:03
45823 bytes -7 bytes zopfli --i1000 --mls4 --bsr21 --lazy --ohh October 2, 2018 @ 19:01
45830 bytes – zopfli --i100 --mls4 --bsr22 --lazy --ohh October 2, 2018 @ 10:32

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 @ 12:55.

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 45832 45827 45829 45828 45831 45828 45827 45830 45827 45849 45822 45825 45847 45839 45844
4 45820 45823 45819 45820 45823 45826 45830 45824 45827 45837 45830 45830 45830 45823 45826
6 45839 45839 45821 45823 45824 45824 45839 45824 45825 45833 45834 45822 45840 45834 45833
7 45818 45818 45819 45823 45820 45826 45831 45825 45841 45831 45832 45833 45844 45838 45840
8 45820 45821 45821 45821 45821 45841 45830 45825 45842 45833 45840 45836 45846 45834 45822
9 45820 45818 45833 45835 45833 45843 45830 45829 45841 45835 45845 45838 45840 45815 45812
10 45821 45812 45822 45818 45824 45846 45833 45824 45843 45836 45838 45832 45844 45809 45812
11 45819 45823 45822 45821 45821 45824 45829 45823 45822 45832 45836 45841 45844 45817 45828
12 45823 45821 45820 45824 45818 45838 45831 45819 45841 45831 45838 45832 45844 45819 45819
13 45820 45823 45821 45834 45821 45824 45833 45822 45823 45837 45846 45833 45839 45817 45817
14 45818 45817 45821 45814 45829 45841 45832 45832 45824 45839 45835 45826 45841 45823 45830
15 45821 45821 45821 45820 45839 45824 45831 45823 45824 45831 45834 45822 45839 45817 45817
16 45819 45818 45821 45823 45831 45832 45831 45824 45842 45831 45830 45838 45841 45817 45838
17 45818 45818 45820 45822 45829 45833 45831 45824 45825 45830 45842 45840 45846 45819 45845
18 45820 45824 45813 45817 45821 45825 45833 45825 45839 45831 45831 45826 45844 45820 45847
19 45821 45821 45819 45823 45833 45841 45829 45825 45839 45831 45831 45823 45846 45823 45822
20 45820 45819 45819 45819 45832 45825 45831 45823 45840 45831 45841 45822 45844 45824 45823
21 45819 45814 45822 45842 45821 45825 45839 45822 45822 45836 45834 45836 45841 45823 45822
22 45820 45813 45824 45824 45830 45832 45831 45823 45833 45831 45831 45829 45844 45832 45818
23 45820 45819 45821 45820 45830 45845 45834 45824 45822 45833 45832 45829 45846 45817 45817
25 45818 45820 45822 45831 45830 45831 45830 45825 45833 45831 45844 45831 45844 45825 45823
30 45818 45818 45822 45836 45832 45840 45831 45824 45841 45831 45831 45822 45842 45818 45823
40 45819 45820 45819 45822 45833 45825 45834 45825 45844 45843 45834 45823 45841 45827 45817

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 45830 bytes – 100%
1,000 45822 bytes -8 bytes 100%
10,000 45814 bytes -8 bytes 100%
100,000 45810 bytes -4 bytes 2.61%
1,000,000 45809 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) 45950 bytes +141 bytes (+0.31%) +39 bytes
1 45911 bytes +102 bytes (+0.22%) –
2 45950 bytes +141 bytes (+0.31%) +39 bytes
3 45949 bytes +140 bytes (+0.31%) +38 bytes
4 45978 bytes +169 bytes (+0.37%) +67 bytes
5 45988 bytes +179 bytes (+0.39%) +77 bytes
6 45993 bytes +184 bytes (+0.40%) +82 bytes
7 46032 bytes +223 bytes (+0.49%) +121 bytes
8 46048 bytes +239 bytes (+0.52%) +137 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 34374 bytes -11435 bytes (-24.96%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 40542 bytes -5267 bytes (-11.50%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 41366 bytes -4443 bytes (-9.70%)
Brotli (Wikipedia) brotli brotli -q 11 42438 bytes -3371 bytes (-7.36%)
LZMA2 (Wikipedia) xz xz -9 43460 bytes -2349 bytes (-5.13%)
Zstandard (Wikipedia) zstd zstd -19 44628 bytes -1181 bytes (-2.58%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 44903 bytes -906 bytes (-1.98%)

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.