Choose a version:
26% The original file has 637378 bytes (622.4k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 167362 bytes (163.4k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  56244 bytes (54.9k)
local copy
gzip -9
  56182 bytes (54.9k)
local copy
7zip -mx=9 -tgzip
  53518 bytes (52.3k)
local copy
libdeflate -12
  53513 bytes (52.3k)
local copy
zultra
  53445 bytes (52.2k)
local copy
kzip -s0 -rn -b1
  53444 bytes (52.2k)
local copy
pigz -11 -n
  53411 bytes (52.2k)
local copy
Zopfli
  53353 bytes (52.1k)
local copy
Zopfli (defluff)
  53350 bytes (52.1k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.13.8.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.13.8 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 --mls256 --bsr21 --lazy --ohh

(found March 12, 2022)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 256  --mls256
block splitting recursion 21  --bsr21
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 (53350 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.13.8/dojo.js --location | md5sum
043eb626777eec11fc182d5458b78f5d  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.8.min.zopfli.js.gz | md5sum
043eb626777eec11fc182d5458b78f5d  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.13.8/dojo.js --location | sha1sum
56fbbdfbf71442eb3335afe539b3a7cd910b5b66  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.8.min.zopfli.js.gz | sha1sum
56fbbdfbf71442eb3335afe539b3a7cd910b5b66  -

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
53353 bytes -1 byte zopfli --i1000000 --mls256 --bsr21 --lazy --ohh March 12, 2022 @ 03:02
53354 bytes -1 byte zopfli --i100000 --mls16 --bsr16 --lazy --ohh March 5, 2022 @ 13:01
53355 bytes -1 byte zopfli --i100000 --mls8 --bsr6 --lazy --ohh March 4, 2022 @ 18:31
53356 bytes -1 byte zopfli --i10000 --mls8 --bsr6 --lazy --ohh February 25, 2022 @ 14:38
53357 bytes -3 bytes zopfli --i10000 --mls16 --bsr20 --lazy --ohh February 25, 2022 @ 14:01
53360 bytes -1 byte zopfli --i10000 --mls8 --bsr19 --lazy --ohh February 25, 2022 @ 11:40
53361 bytes -1 byte zopfli --i10000 --mls2 --bsr14 --lazy --ohh February 25, 2022 @ 10:02
53362 bytes -1 byte zopfli --i10000 --mls8 --bsr8 --lazy --ohh February 25, 2022 @ 09:57
53363 bytes -2 bytes zopfli --i10000 --mls128 --bsr13 --lazy --ohh February 25, 2022 @ 04:55
53365 bytes -2 bytes zopfli --i1000 --mls4 --bsr9 --lazy --ohh February 24, 2022 @ 18:37
53367 bytes -1 byte zopfli --i1000 --mls32 --bsr19 --lazy --ohh February 24, 2022 @ 17:12
53368 bytes zopfli --i100 --mls4 --bsr9 --lazy --ohh February 24, 2022 @ 16:09

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

Most recent activity on March 14, 2022 @ 11:34.

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
53358 53367 53358 53365 53363 53363 53362 53357 53357 53364 53377 53383 53380 53386 53398
53396 53387 53365 53359 53366 53368 53366 53362 53367 53366 53369 53376 53374 53374 53368
53399 53357 53355 53359 53358 53360 53361 53374 53369 53359 53369 53374 53371 53375 53367
53387 53400 53363 53360 53363 53376 53361 53371 53371 53364 53366 53364 53367 53375 53369
53363 53384 53362 53358 53364 53373 53362 53357 53373 53385 53371 53376 53368 53371 53369
53388 53360 53358 53363 53366 53362 53363 53362 53370 53365 53373 53372 53369 53371 53366
53362 53383 53355 53375 53367 53372 53362 53362 53365 53372 53389 53376 53365 53370 53368
53390 53384 53355 53359 53366 53372 53361 53356 53371 53372 53386 53377 53370 53377 53373
53385 53385 53360 53391 53366 53366 53361 53361 53370 53381 53370 53376 53364 53375 53367
53388 53397 53362 53360 53359 53370 53363 53364 53370 53384 53371 53373 53370 53374 53366
53361 53365 53362 53390 53365 53376 53362 53362 53365 53367 53370 53371 53370 53377 53404
53381 53393 53362 53361 53367 53362 53361 53363 53365 53365 53367 53374 53375 53375 53369
53381 53394 53355 53354 53360 53369 53362 53368 53372 53365 53374 53368 53373 53374 53366
53384 53381 53365 53357 53366 53376 53362 53361 53371 53384 53373 53374 53369 53370 53369
53386 53392 53362 53358 53360 53368 53361 53363 53370 53368 53371 53373 53370 53368 53369
53394 53388 53360 53357 53360 53385 53361 53362 53371 53384 53374 53372 53364 53369 53369
53393 53383 53361 53357 53366 53366 53366 53365 53370 53370 53388 53376 53366 53371 53364
53383 53385 53358 53357 53365 53378 53362 53353 53371 53364 53373 53372 53366 53370 53371
53388 53387 53363 53357 53361 53373 53361 53363 53370 53364 53389 53373 53370 53367 53368
53390 53397 53362 53363 53360 53377 53361 53361 53369 53364 53376 53373 53370 53366 53368
53386 53383 53357 53363 53357 53364 53369 53361 53373 53385 53372 53374 53368 53373 53367
53395 53390 53363 53358 53369 53369 53362 53363 53370 53384 53387 53373 53370 53366 53363
53387 53362 53358 53363 53360 53369 53363 53363 53365 53364 53369 53372 53375 53368 53366

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 53368 bytes 100%
1,000 53365 bytes -3 bytes 100%
10,000 53356 bytes -9 bytes 100%
100,000 53354 bytes -2 bytes 3.19%
1,000,000 53353 bytes -1 byte 0.58%
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
53520 bytes +167 bytes (+0.31%) +76 bytes
53444 bytes +91 bytes (+0.17%)
53471 bytes +118 bytes (+0.22%) +27 bytes
53500 bytes +147 bytes (+0.28%) +56 bytes
53514 bytes +161 bytes (+0.30%) +70 bytes
53542 bytes +189 bytes (+0.35%) +98 bytes
53590 bytes +237 bytes (+0.44%) +146 bytes
53586 bytes +233 bytes (+0.44%) +142 bytes
53588 bytes +235 bytes (+0.44%) +144 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 39200 bytes -14153 bytes (-26.53%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46824 bytes -6529 bytes (-12.24%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47803 bytes -5550 bytes (-10.40%)
Brotli (Wikipedia) brotli brotli -q 11 49286 bytes -4067 bytes (-7.62%)
LZMA2 (Wikipedia) xz xz -9 50356 bytes -2997 bytes (-5.62%)
Zstandard (Wikipedia) zstd zstd -19 51669 bytes -1684 bytes (-3.16%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51823 bytes -1530 bytes (-2.87%)

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.