Choose a version:
26% The original file has 637173 bytes (622.2k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 167216 bytes (163.3k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  56226 bytes (54.9k)
local copy
gzip -9
  56160 bytes (54.8k)
local copy
libdeflate -12
  53470 bytes (52.2k)
local copy
7zip -mx=9 -tgzip
  53445 bytes (52.2k)
local copy
zultra
  53404 bytes (52.2k)
local copy
pigz -11 -n
  53397 bytes (52.1k)
local copy
kzip -s0 -rn -b1
  53394 bytes (52.1k)
local copy
Zopfli
  53298 bytes (52.0k)
local copy
Zopfli (defluff)
  53294 bytes (52.0k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.13.7.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.13.7 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 --bsr22 --lazy --ohh

(found March 11, 2022)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 128  --mls128
block splitting recursion 22  --bsr22
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 (53294 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.13.7/dojo.js --location | md5sum
c98af7a18a75aea58c976d9d4362c548  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.7.min.zopfli.js.gz | md5sum
c98af7a18a75aea58c976d9d4362c548  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.13.7/dojo.js --location | sha1sum
332f5bd261a43a1a198c4118c5c69fb4a9d826d5  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.7.min.zopfli.js.gz | sha1sum
332f5bd261a43a1a198c4118c5c69fb4a9d826d5  -

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
53298 bytes -1 byte zopfli --i1000000 --mls128 --bsr22 --lazy --ohh March 11, 2022 @ 19:00
53299 bytes -7 bytes zopfli --i100000 --mls128 --bsr19 --lazy --ohh March 4, 2022 @ 11:11
53306 bytes -1 byte zopfli --i10000 --mls128 --bsr19 --lazy --ohh February 25, 2022 @ 15:50
53307 bytes -4 bytes zopfli --i10000 --mls4 --bsr18 --lazy --ohh February 25, 2022 @ 10:22
53311 bytes -1 byte zopfli --i10000 --mls64 --bsr2 --lazy --ohh February 25, 2022 @ 06:19
53312 bytes -1 byte zopfli --i10000 --mls256 --bsr10 --lazy --ohh February 25, 2022 @ 06:01
53313 bytes -3 bytes zopfli --i1000 --mls4 --bsr18 --lazy --ohh February 24, 2022 @ 17:40
53316 bytes -2 bytes zopfli --i1000 --mls128 --bsr16 --lazy --ohh February 24, 2022 @ 17:07
53318 bytes zopfli --i100 --mls16 --bsr22 --lazy --ohh February 24, 2022 @ 15:29

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

Most recent activity on March 13, 2022 @ 09:56.

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
53310 53310 53312 53312 53309 53311 53310 53311 53310 53312 53323 53323 53324 53335 53335
53338 53308 53310 53312 53314 53319 53313 53308 53314 53307 53317 53320 53326 53325 53322
53342 53340 53308 53310 53310 53310 53307 53319 53316 53309 53314 53314 53318 53319 53326
53352 53307 53307 53312 53310 53321 53317 53314 53316 53312 53329 53316 53315 53330 53316
53341 53307 53343 53310 53300 53324 53310 53308 53317 53324 53323 53317 53324 53324 53318
53346 53307 53310 53312 53310 53313 53310 53309 53316 53317 53322 53318 53319 53334 53324
53307 53308 53307 53307 53312 53322 53309 53312 53319 53320 53310 53318 53320 53324 53321
53307 53307 53298 53310 53313 53329 53298 53300 53317 53317 53323 53322 53319 53326 53339
53345 53336 53339 53311 53312 53311 53310 53307 53316 53321 53316 53314 53317 53324 53325
53339 53308 53338 53312 53309 53318 53310 53308 53316 53322 53323 53316 53323 53328 53325
53309 53309 53309 53343 53313 53313 53308 53310 53316 53324 53323 53319 53321 53321 53323
53308 53337 53310 53311 53308 53315 53310 53315 53317 53301 53327 53316 53318 53331 53321
53336 53334 53339 53341 53309 53307 53307 53319 53316 53317 53322 53318 53321 53331 53316
53335 53307 53312 53311 53309 53310 53307 53314 53320 53323 53322 53318 53321 53321 53322
53307 53307 53307 53310 53309 53313 53298 53309 53319 53317 53318 53316 53317 53329 53323
53337 53299 53309 53311 53318 53312 53298 53308 53315 53317 53322 53319 53321 53329 53316
53346 53308 53308 53311 53308 53311 53314 53314 53316 53318 53313 53319 53318 53322 53319
53334 53334 53334 53311 53310 53312 53311 53300 53316 53317 53323 53319 53318 53330 53324
53339 53299 53310 53311 53310 53308 53298 53309 53317 53321 53321 53319 53323 53323 53325
53308 53310 53308 53309 53307 53334 53310 53319 53316 53317 53322 53321 53318 53336 53322
53340 53333 53338 53309 53307 53299 53317 53307 53315 53315 53323 53316 53317 53322 53323
53339 53333 53311 53311 53308 53324 53310 53310 53317 53317 53318 53317 53318 53331 53321
53339 53335 53310 53311 53308 53311 53308 53310 53319 53317 53327 53318 53326 53329 53322

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 53318 bytes 100%
1,000 53313 bytes -5 bytes 100%
10,000 53306 bytes -7 bytes 100%
100,000 53299 bytes -7 bytes 3.48%
1,000,000 53298 bytes -1 byte 2.32%
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
53469 bytes +171 bytes (+0.32%) +75 bytes
53394 bytes +96 bytes (+0.18%)
53425 bytes +127 bytes (+0.24%) +31 bytes
53455 bytes +157 bytes (+0.29%) +61 bytes
53474 bytes +176 bytes (+0.33%) +80 bytes
53482 bytes +184 bytes (+0.35%) +88 bytes
53467 bytes +169 bytes (+0.32%) +73 bytes
53517 bytes +219 bytes (+0.41%) +123 bytes
53532 bytes +234 bytes (+0.44%) +138 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 39182 bytes -14116 bytes (-26.49%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46780 bytes -6518 bytes (-12.23%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47737 bytes -5561 bytes (-10.43%)
Brotli (Wikipedia) brotli brotli -q 11 49194 bytes -4104 bytes (-7.70%)
LZMA2 (Wikipedia) xz xz -9 50280 bytes -3018 bytes (-5.66%)
Zstandard (Wikipedia) zstd zstd -19 51627 bytes -1671 bytes (-3.14%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51934 bytes -1364 bytes (-2.56%)

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.