Choose a version:
26% The original file has 635169 bytes (620.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 165420 bytes (161.5k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  55673 bytes (54.4k)
local copy
gzip -9
  55618 bytes (54.3k)
local copy
7zip -mx=9 -tgzip
  52954 bytes (51.7k)
local copy
libdeflate -12
  52931 bytes (51.7k)
local copy
pigz -11 -n
  52866 bytes (51.6k)
local copy
kzip -s0 -rn -b1
  52860 bytes (51.6k)
local copy
Zopfli
  52778 bytes (51.5k)
local copy
Zopfli (defluff)
  52774 bytes (51.5k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.10.9.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.10.9 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 --i100000 --mb8 --mls8 --bsr6 --lazy --ohh

(found September 27, 2017)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 8  --mls8
block splitting recursion 6  --bsr6
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 4 more bytes (52774 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.10.9/dojo.js --location | md5sum
eb60c4fe0b1bfb44134cfee9af46684a  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.10.9.min.zopfli.js.gz | md5sum
eb60c4fe0b1bfb44134cfee9af46684a  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.10.9/dojo.js --location | sha1sum
e19ee049b690065b5ae3895377b12da40ec4dff3  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.10.9.min.zopfli.js.gz | sha1sum
e19ee049b690065b5ae3895377b12da40ec4dff3  -

Other Versions

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

1.14.2, 1.14.1, 1.14.0,
1.13.3, 1.13.2, 1.13.1, 1.13.0,
1.12.4, 1.12.3, 1.12.2, 1.12.1,
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,
1.6.3, 1.6.2, 1.6.1, 1.6.0,
1.5.4, 1.5.3, 1.5.2, 1.5.1, 1.5.0,
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

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
52778 bytes -1 byte zopfli --i100000 --mls8 --bsr6 --lazy --ohh September 27, 2017 @ 21:42
52779 bytes -1 byte zopfli --i10000 --mls8 --bsr6 --lazy --ohh September 27, 2017 @ 17:13
52780 bytes -1 byte zopfli --i10000 --mls4 --bsr6 --lazy --ohh September 27, 2017 @ 16:58
52781 bytes -8 bytes zopfli --i10000 --mls4 --bsr16 --lazy --ohh September 27, 2017 @ 16:50
52789 bytes -1 byte zopfli --i1000 --mls32 --bsr16 --lazy --ohh September 27, 2017 @ 14:55
52790 bytes -1 byte zopfli --i1000 --mls256 --bsr30 --lazy --ohh September 27, 2017 @ 14:40
52791 bytes -1 byte zopfli --i1000 --mls4 --bsr12 --lazy --ohh September 27, 2017 @ 14:40
52792 bytes -2 bytes zopfli --i1000 --mls4 --bsr17 --lazy --ohh September 27, 2017 @ 14:39
52794 bytes zopfli --i100 --mls256 --bsr30 --lazy --ohh September 27, 2017 @ 14:14

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

Most recent activity on September 29, 2017 @ 06:14.

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 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
52783 52784 52784 52786 52787 52784 52783 52785 52794 52793 52796 52785 52794 52813 52790
52799 52784 52787 52821 52782 52787 52799 52787 52785 52798 52794 52799 52794 52792 52795
52783 52780 52778 52783 52780 52785 52790 52791 52789 52790 52792 52788 52795 52792 52798
52823 52781 52792 52827 52782 52784 52790 52792 52788 52784 52788 52792 52786 52788 52802
52780 52781 52825 52792 52780 52789 52785 52784 52790 52793 52797 52793 52794 52801 52796
52780 52781 52780 52788 52797 52782 52790 52799 52791 52791 52793 52792 52794 52803 52798
52781 52780 52824 52780 52784 52787 52785 52782 52791 52791 52793 52789 52793 52795 52801
52781 52781 52781 52821 52782 52796 52791 52785 52794 52792 52794 52796 52792 52792 52792
52780 52781 52834 52828 52793 52785 52789 52795 52787 52791 52793 52795 52792 52801 52800
52783 52781 52778 52784 52794 52789 52792 52780 52793 52791 52793 52792 52793 52802 52800
52782 52823 52780 52792 52778 52783 52785 52781 52790 52792 52794 52793 52791 52799 52804
52781 52780 52792 52784 52783 52785 52798 52790 52787 52793 52797 52788 52802 52785 52802
52782 52781 52833 52822 52780 52796 52781 52792 52793 52793 52793 52792 52793 52800 52802
52781 52781 52782 52786 52782 52782 52785 52792 52787 52793 52792 52795 52793 52800 52798
52782 52781 52781 52785 52781 52785 52785 52785 52790 52790 52797 52795 52791 52795 52794
52781 52781 52781 52781 52780 52782 52789 52786 52791 52792 52795 52788 52793 52800 52797
52783 52781 52782 52783 52782 52783 52790 52781 52791 52791 52795 52796 52793 52800 52790
52781 52781 52781 52781 52782 52785 52783 52785 52791 52790 52796 52792 52793 52793 52796
52781 52781 52844 52783 52780 52781 52781 52791 52791 52786 52793 52796 52795 52808 52799
52782 52781 52823 52783 52824 52789 52782 52785 52788 52792 52794 52795 52792 52791 52801
52780 52780 52781 52820 52780 52783 52790 52785 52790 52791 52795 52793 52793 52794 52791
52782 52780 52781 52783 52780 52782 52785 52780 52795 52792 52796 52797 52792 52796 52798
52781 52780 52781 52781 52780 52785 52781 52781 52790 52792 52795 52795 52792 52799 52801

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 52794 bytes 100%
1,000 52789 bytes -5 bytes 100%
10,000 52779 bytes -10 bytes 100%
100,000 52778 bytes -1 byte 0.87%
1,000,000 52778 bytes 0.87%
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
52963 bytes +185 bytes (+0.35%) +103 bytes
52860 bytes +82 bytes (+0.16%)
52900 bytes +122 bytes (+0.23%) +40 bytes
52928 bytes +150 bytes (+0.28%) +68 bytes
52963 bytes +185 bytes (+0.35%) +103 bytes
52983 bytes +205 bytes (+0.39%) +123 bytes
53004 bytes +226 bytes (+0.43%) +144 bytes
53040 bytes +262 bytes (+0.50%) +180 bytes
53062 bytes +284 bytes (+0.54%) +202 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 - but your browser doesn't support it.
Algorithm Program Parameters Size Compared To Best Zopfli
ZPAQ (Wikipedia) zpaq zpaq -method 69 38843 bytes -13935 bytes (-26.40%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46347 bytes -6431 bytes (-12.19%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47289 bytes -5489 bytes (-10.40%)
Brotli (Wikipedia) brotli brotli -q 11 48740 bytes -4038 bytes (-7.65%)
LZMA2 (Wikipedia) xz xz -9 49832 bytes -2946 bytes (-5.58%)
Zstandard (Wikipedia) zstd zstd -19 51407 bytes -1371 bytes (-2.60%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51518 bytes -1260 bytes (-2.39%)

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):


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 2018.
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