Choose a version:
26% 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).

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:

1.17.2, 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
53066 53066 53067 53067 53067 53068 53067 53067 53068 53067 53069 53069 53077 53093 53079
53082 53065 53065 53066 53075 53070 53063 53065 53071 53075 53075 53069 53077 53079 53074
53095 53065 53066 53067 53071 53067 53065 53067 53072 53087 53083 53075 53076 53076 53077
53100 53063 53069 53102 53064 53064 53066 53069 53073 53066 53077 53069 53080 53086 53075
53064 53054 53063 53066 53067 53066 53063 53065 53072 53078 53077 53067 53077 53077 53076
53065 53063 53065 53065 53069 53068 53066 53066 53071 53086 53076 53067 53078 53077 53074
53098 53064 53064 53069 53079 53063 53078 53065 53072 53076 53078 53067 53079 53073 53079
53100 53054 53064 53066 53069 53067 53063 53063 53073 53075 53076 53075 53074 53082 53073
53099 53064 53065 53069 53069 53068 53056 53064 53072 53075 53067 53075 53078 53070 53079
53065 53066 53065 53064 53067 53063 53066 53064 53072 53074 53077 53065 53074 53084 53075
53063 53064 53056 53071 53070 53069 53066 53067 53072 53077 53077 53074 53074 53086 53073
53096 53063 53056 53069 53067 53067 53056 53073 53073 53075 53077 53067 53076 53086 53082
53066 53064 53064 53064 53063 53069 53065 53076 53073 53075 53071 53068 53073 53075 53074
53064 53064 53071 53064 53065 53067 53063 53073 53073 53088 53077 53067 53077 53074 53081
53099 53054 53064 53066 53065 53063 53066 53072 53073 53077 53089 53075 53074 53076 53076
53098 53063 53066 53069 53079 53067 53066 53065 53071 53075 53070 53067 53074 53084 53076
53100 53063 53064 53069 53069 53064 53063 53073 53073 53077 53070 53073 53075 53074 53075
53099 53063 53065 53064 53065 53065 53066 53066 53072 53088 53077 53069 53074 53075 53082
53092 53063 53066 53069 53069 53063 53066 53073 53072 53075 53071 53066 53073 53082 53075
53099 53064 53064 53066 53066 53066 53064 53073 53072 53076 53074 53068 53078 53090 53072
53098 53063 53066 53065 53065 53063 53064 53072 53072 53083 53071 53068 53074 53089 53077
53094 53063 53067 53069 53070 53063 53064 53065 53073 53075 53071 53068 53075 53087 53074
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
53206 bytes +152 bytes (+0.29%) +58 bytes
53148 bytes +94 bytes (+0.18%)
53159 bytes +105 bytes (+0.20%) +11 bytes
53197 bytes +143 bytes (+0.27%) +49 bytes
53215 bytes +161 bytes (+0.30%) +67 bytes
53243 bytes +189 bytes (+0.36%) +95 bytes
53299 bytes +245 bytes (+0.46%) +151 bytes
53331 bytes +277 bytes (+0.52%) +183 bytes
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):


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 2022.
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.