Choose a version:
26% The original file has 638007 bytes (623.1k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 167162 bytes (163.2k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  56231 bytes (54.9k)
local copy
gzip -9
  56163 bytes (54.8k)
local copy
libdeflate -12
  53507 bytes (52.3k)
local copy
7zip -mx=9 -tgzip
  53474 bytes (52.2k)
local copy
kzip -s0 -rn -b1
  53394 bytes (52.1k)
local copy
pigz -11 -n
  53376 bytes (52.1k)
local copy
Zopfli
  53296 bytes (52.0k)
local copy
Zopfli (defluff)
  53293 bytes (52.0k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.14.2.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.14.2 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 --mls128 --bsr15 --lazy --ohh

(found October 2, 2018)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 128  --mls128
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 3 more bytes (53293 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.14.2/dojo.js --location | md5sum
c013c4f49eca40b192d1e26ac4291b98  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.14.2.min.zopfli.js.gz | md5sum
c013c4f49eca40b192d1e26ac4291b98  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.14.2/dojo.js --location | sha1sum
d73eba27cc1aa4d598e064fb18d488220ed48986  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.14.2.min.zopfli.js.gz | sha1sum
d73eba27cc1aa4d598e064fb18d488220ed48986  -

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
53296 bytes -1 byte zopfli --i1000000 --mls128 --bsr15 --lazy --ohh October 2, 2018 @ 18:47
53297 bytes -1 byte zopfli --i100000 --mls128 --bsr18 --lazy --ohh October 1, 2018 @ 17:04
53298 bytes -6 bytes zopfli --i100000 --mls128 --bsr23 --lazy --ohh October 1, 2018 @ 12:13
53304 bytes -1 byte zopfli --i10000 --mls128 --bsr40 --lazy --ohh October 1, 2018 @ 11:05
53305 bytes -1 byte zopfli --i10000 --mls8 --bsr25 --lazy --ohh October 1, 2018 @ 10:31
53306 bytes -3 bytes zopfli --i10000 --mls8 --bsr8 --lazy --ohh October 1, 2018 @ 10:21
53309 bytes -2 bytes zopfli --i10000 --mls4 --bsr14 --lazy --ohh October 1, 2018 @ 10:21
53311 bytes -2 bytes zopfli --i1000 --mls256 --bsr6 --lazy --ohh October 1, 2018 @ 09:50
53313 bytes -1 byte zopfli --i1000 --mls256 --bsr19 --lazy --ohh October 1, 2018 @ 09:50
53314 bytes zopfli --i100 --mls256 --bsr6 --lazy --ohh October 1, 2018 @ 09:39

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

Most recent activity on October 3, 2018 @ 03:41.

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
53348 53307 53309 53309 53310 53308 53313 53307 53324 53316 53309 53310 53321 53336 53336
53342 53346 53311 53310 53310 53321 53309 53306 53315 53311 53318 53313 53320 53329 53316
53338 53344 53306 53309 53307 53319 53322 53307 53317 53315 53323 53328 53318 53328 53321
53339 53336 53306 53309 53321 53318 53313 53308 53311 53316 53323 53307 53315 53327 53319
53349 53338 53306 53346 53309 53319 53297 53307 53322 53314 53327 53313 53323 53319 53324
53317 53349 53310 53306 53306 53319 53307 53307 53315 53315 53328 53319 53320 53330 53324
53308 53338 53310 53306 53318 53319 53308 53306 53315 53318 53321 53308 53308 53327 53331
53353 53342 53346 53338 53308 53319 53307 53309 53315 53314 53318 53307 53319 53328 53316
53343 53339 53310 53348 53307 53322 53298 53307 53315 53314 53321 53319 53319 53320 53327
53342 53339 53306 53309 53310 53320 53297 53307 53315 53315 53318 53307 53307 53330 53324
53306 53309 53343 53308 53310 53320 53297 53307 53316 53316 53321 53313 53319 53332 53315
53338 53343 53308 53308 53311 53319 53296 53307 53315 53316 53322 53308 53307 53320 53329
53344 53339 53306 53345 53310 53307 53297 53306 53315 53326 53319 53311 53317 53321 53327
53337 53339 53309 53347 53310 53307 53298 53306 53316 53314 53321 53311 53319 53321 53326
53352 53340 53309 53308 53307 53306 53297 53299 53315 53314 53326 53307 53319 53328 53362
53339 53337 53310 53346 53311 53320 53297 53306 53316 53315 53321 53326 53319 53327 53329
53337 53341 53308 53308 53308 53321 53297 53316 53315 53315 53317 53311 53320 53328 53332
53336 53340 53310 53306 53306 53317 53297 53300 53315 53315 53320 53307 53319 53321 53329
53341 53338 53309 53308 53308 53322 53296 53308 53315 53315 53317 53319 53318 53329 53316
53308 53341 53343 53338 53307 53319 53298 53307 53315 53315 53320 53307 53318 53321 53326
53340 53338 53299 53347 53307 53319 53297 53316 53319 53316 53322 53307 53320 53326 53325
53339 53339 53306 53344 53310 53306 53306 53308 53315 53315 53321 53315 53317 53329 53325
53341 53352 53310 53339 53310 53319 53298 53298 53315 53315 53317 53313 53319 53322 53325

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 53314 bytes 100%
1,000 53311 bytes -3 bytes 100%
10,000 53304 bytes -7 bytes 100%
100,000 53297 bytes -7 bytes 5.51%
1,000,000 53296 bytes -1 byte 3.19%
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
53479 bytes +183 bytes (+0.34%) +85 bytes
53394 bytes +98 bytes (+0.18%)
53423 bytes +127 bytes (+0.24%) +29 bytes
53451 bytes +155 bytes (+0.29%) +57 bytes
53479 bytes +183 bytes (+0.34%) +85 bytes
53476 bytes +180 bytes (+0.34%) +82 bytes
53469 bytes +173 bytes (+0.32%) +75 bytes
53505 bytes +209 bytes (+0.39%) +111 bytes
53552 bytes +256 bytes (+0.48%) +158 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 39129 bytes -14167 bytes (-26.58%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46770 bytes -6526 bytes (-12.24%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47726 bytes -5570 bytes (-10.45%)
Brotli (Wikipedia) brotli brotli -q 11 49193 bytes -4103 bytes (-7.70%)
LZMA2 (Wikipedia) xz xz -9 50296 bytes -3000 bytes (-5.63%)
Zstandard (Wikipedia) zstd zstd -19 51739 bytes -1557 bytes (-2.92%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51945 bytes -1351 bytes (-2.53%)

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