Choose a version:
26% The original file has 636347 bytes (621.4k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 166223 bytes (162.3k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  55965 bytes (54.7k)
local copy
gzip -9
  55907 bytes (54.6k)
local copy
libdeflate -12
  53254 bytes (52.0k)
local copy
7zip -mx=9 -tgzip
  53238 bytes (52.0k)
local copy
pigz -11 -n
  53161 bytes (51.9k)
local copy
kzip -s0 -rn -b1
  53156 bytes (51.9k)
local copy
Zopfli
  53070 bytes (51.8k)
local copy
Zopfli (defluff)
  53068 bytes (51.8k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.13.0.min.js

You will automatically get the smallest Dojo 1.13.0 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 --mls8 --bsr15 --lazy --ohh

(found September 28, 2017)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 8  --mls8
block splitting recursion 15  --bsr15
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 2 more bytes (53068 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed http://download.dojotoolkit.org/release-1.13.0/dojo.js --location | md5sum
d3a213c02d3b4efe9251faf0943e049f  -
curl --silent --compressed http://minime.stephan-brumme.com/files/dojo/dojo-1.13.0.min.zopfli.js.gz | md5sum
d3a213c02d3b4efe9251faf0943e049f  -

SHA1:
curl --silent --compressed http://download.dojotoolkit.org/release-1.13.0/dojo.js --location | sha1sum
2c8531207a0b0c09532c744860359c819c0dba8e  -
curl --silent --compressed http://minime.stephan-brumme.com/files/dojo/dojo-1.13.0.min.zopfli.js.gz | sha1sum
2c8531207a0b0c09532c744860359c819c0dba8e  -

Other Versions

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

1.13.0,
1.12.2, 1.12.1,
1.11.5, 1.11.4, 1.11.3, 1.11.2, 1.11.1, 1.11.0,
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,
1.8.12, 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,
1.7.10, 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
53070 bytes -1 byte zopfli --i1000000 --mls8 --bsr15 --lazy --ohh September 28, 2017 @ 22:11
53071 bytes -1 byte zopfli --i100000 --mls8 --bsr15 --lazy --ohh September 28, 2017 @ 07:03
53072 bytes -2 bytes zopfli --i100000 --mls2 --bsr8 --lazy --ohh September 28, 2017 @ 06:30
53074 bytes -7 bytes zopfli --i10000 --mls2 --bsr8 --lazy --ohh September 27, 2017 @ 16:51
53081 bytes -1 byte zopfli --i1000 --mls2 --bsr25 --lazy --ohh September 27, 2017 @ 14:46
53082 bytes -1 byte zopfli --i1000 --mls8 --bsr15 --lazy --ohh September 27, 2017 @ 14:41
53083 bytes -1 byte zopfli --i1000 --mls2 --bsr14 --lazy --ohh September 27, 2017 @ 14:40
53084 bytes zopfli --i100 --mls8 --bsr22 --lazy --ohh September 27, 2017 @ 14:02

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 @ 10:42.

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
53077 53078 53078 53078 53076 53074 53075 53075 53092 53093 53092 53080 53089 53113 53112
53081 53076 53082 53078 53079 53085 53080 53076 53083 53080 53083 53092 53091 53090 53092
53077 53076 53075 53076 53076 53078 53075 53083 53087 53082 53103 53083 53084 53092 53085
53075 53118 53076 53118 53077 53091 53087 53088 53080 53083 53101 53091 53085 53104 53089
53072 53071 53077 53076 53080 53096 53076 53076 53094 53092 53091 53091 53090 53092 53096
53113 53114 53082 53079 53079 53080 53075 53077 53088 53087 53090 53088 53088 53097 53088
53075 53113 53076 53117 53091 53100 53080 53075 53083 53087 53102 53078 53085 53097 53094
53071 53106 53075 53082 53077 53100 53075 53078 53088 53090 53091 53083 53084 53092 53082
53075 53112 53071 53111 53080 53080 53076 53077 53088 53088 53092 53078 53092 53101 53092
53075 53075 53071 53076 53076 53091 53075 53077 53087 53088 53091 53093 53087 53097 53087
53075 53113 53075 53119 53115 53080 53079 53079 53087 53087 53098 53089 53088 53093 53102
53072 53113 53070 53078 53077 53077 53071 53084 53083 53079 53101 53090 53088 53105 53088
53077 53111 53075 53115 53081 53076 53078 53088 53087 53087 53091 53085 53084 53094 53088
53075 53112 53072 53076 53079 53079 53072 53083 53087 53101 53101 53091 53090 53095 53088
53075 53112 53071 53117 53080 53083 53076 53078 53084 53087 53098 53088 53089 53094 53087
53077 53113 53071 53077 53116 53084 53079 53078 53088 53088 53091 53078 53089 53095 53088
53075 53109 53072 53072 53077 53083 53087 53084 53088 53088 53098 53081 53088 53095 53088
53075 53072 53075 53075 53076 53083 53082 53076 53088 53090 53090 53088 53088 53092 53088
53111 53114 53071 53078 53077 53078 53075 53084 53083 53088 53101 53089 53087 53094 53088
53077 53113 53075 53081 53077 53081 53078 53084 53086 53090 53092 53077 53087 53091 53087
53072 53111 53075 53125 53077 53076 53088 53076 53083 53089 53090 53086 53090 53085 53088
53075 53112 53071 53078 53080 53078 53076 53077 53087 53091 53098 53089 53088 53081 53085
53075 53112 53076 53081 53076 53075 53076 53077 53087 53090 53101 53088 53087 53093 53090

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 53084 bytes 100%
1,000 53081 bytes -3 bytes 100%
10,000 53074 bytes -7 bytes 100%
100,000 53071 bytes -3 bytes 5.51%
1,000,000 53070 bytes -1 byte 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
53229 bytes +159 bytes (+0.30%) +73 bytes
53156 bytes +86 bytes (+0.16%)
53187 bytes +117 bytes (+0.22%) +31 bytes
53228 bytes +158 bytes (+0.30%) +72 bytes
53264 bytes +194 bytes (+0.37%) +108 bytes
53290 bytes +220 bytes (+0.41%) +134 bytes
53332 bytes +262 bytes (+0.49%) +176 bytes
53377 bytes +307 bytes (+0.58%) +221 bytes
53386 bytes +316 bytes (+0.60%) +230 bytes

Non-DEFLATE Algorithms

Archivers based on completely different compression algorithms often produce superior results.
Unfortunately, browsers only support gzip compression at the moment.
Algorithm Program Parameters Size Compared To Best Zopfli
ZPAQ (Wikipedia) zpaq zpaq -method 69 38986 bytes -14084 bytes (-26.54%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46560 bytes -6510 bytes (-12.27%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47509 bytes -5561 bytes (-10.48%)
Brotli (Wikipedia) brotli brotli -q 11 49027 bytes -4043 bytes (-7.62%)
LZMA2 (Wikipedia) xz xz -9 50096 bytes -2974 bytes (-5.60%)
ZSTD (Wikipedia) zstd zstd -19 51672 bytes -1398 bytes (-2.63%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51703 bytes -1367 bytes (-2.58%)

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 2017.
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