Choose a version:
26% The original file has 638967 bytes (624.0k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 167735 bytes (163.8k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  56344 bytes (55.0k)
local copy
gzip -9
  56278 bytes (55.0k)
local copy
libdeflate -12
  53590 bytes (52.3k)
local copy
7zip -mx=9 -tgzip
  53578 bytes (52.3k)
local copy
kzip -s0 -rn -b1
  53501 bytes (52.2k)
local copy
pigz -11 -n
  53491 bytes (52.2k)
local copy
Zopfli
  53407 bytes (52.2k)
local copy
Zopfli (defluff)
  53405 bytes (52.2k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.14.3.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.14.3 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 --bsr16 --lazy --ohh

(found February 22, 2019)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 128  --mls128
block splitting recursion 16  --bsr16
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 (53405 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.14.3/dojo.js --location | md5sum
4d97de1c45c5633faf8edd07c48224f4  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.14.3.min.zopfli.js.gz | md5sum
4d97de1c45c5633faf8edd07c48224f4  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.14.3/dojo.js --location | sha1sum
e7180d63a8b85e6a5eba5fe6383996a65ad64c4f  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.14.3.min.zopfli.js.gz | sha1sum
e7180d63a8b85e6a5eba5fe6383996a65ad64c4f  -

Other Versions

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

1.15.0,
1.14.3, 1.14.2, 1.14.1, 1.14.0,
1.13.4, 1.13.3, 1.13.2, 1.13.1, 1.13.0,
1.12.5, 1.12.4, 1.12.3, 1.12.2, 1.12.1,
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,
1.6.3, 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
53407 bytes -6 bytes zopfli --i1000000 --mls128 --bsr16 --lazy --ohh February 22, 2019 @ 00:54
53413 bytes -2 bytes zopfli --i100000 --mls128 --bsr16 --lazy --ohh February 20, 2019 @ 07:07
53415 bytes -2 bytes zopfli --i10000 --mls128 --bsr16 --lazy --ohh February 19, 2019 @ 15:21
53417 bytes -2 bytes zopfli --i10000 --mls4096 --bsr10 --lazy --ohh February 19, 2019 @ 14:08
53419 bytes -5 bytes zopfli --i10000 --mls4096 --bsr19 --lazy --ohh February 19, 2019 @ 13:56
53424 bytes -1 byte zopfli --i1000 --mls4 --bsr18 --lazy --ohh February 19, 2019 @ 12:13
53425 bytes -1 byte zopfli --i1000 --mls256 --bsr40 --lazy --ohh February 19, 2019 @ 07:39
53426 bytes -1 byte zopfli --i1000 --mls2 --bsr8 --lazy --ohh February 19, 2019 @ 07:39
53427 bytes -1 byte zopfli --i1000 --mls8192 --bsr20 --lazy --ohh February 19, 2019 @ 07:37
53428 bytes zopfli --i100 --mls64 --bsr16 --lazy --ohh February 18, 2019 @ 19:38

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

Most recent activity on February 22, 2019 @ 12:39.

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
53417 53423 53419 53420 53420 53416 53422 53414 53439 53436 53422 53420 53420 53455 53432
53417 53444 53422 53418 53434 53433 53418 53418 53429 53422 53439 53427 53417 53438 53422
53445 53425 53418 53418 53418 53426 53421 53429 53430 53430 53433 53438 53426 53436 53428
53456 53444 53421 53456 53433 53431 53418 53419 53428 53423 53436 53422 53418 53437 53427
53416 53449 53441 53460 53417 53431 53417 53416 53440 53434 53438 53425 53419 53432 53432
53449 53416 53421 53418 53418 53420 53419 53420 53428 53428 53433 53418 53416 53440 53428
53416 53445 53419 53455 53441 53415 53428 53416 53428 53430 53431 53417 53417 53436 53435
53416 53443 53420 53418 53418 53415 53418 53419 53428 53428 53431 53417 53426 53437 53424
53417 53451 53416 53462 53418 53416 53413 53415 53429 53429 53434 53425 53431 53437 53432
53441 53451 53417 53418 53430 53428 53415 53418 53429 53428 53431 53418 53418 53435 53430
53417 53416 53457 53417 53421 53417 53408 53420 53428 53429 53431 53424 53422 53434 53428
53445 53442 53421 53418 53433 53429 53415 53423 53428 53428 53436 53422 53417 53437 53433
53453 53451 53416 53420 53420 53416 53407 53421 53425 53435 53430 53425 53417 53437 53429
53445 53445 53422 53459 53422 53425 53415 53430 53429 53428 53429 53417 53425 53437 53432
53443 53416 53417 53418 53417 53416 53415 53429 53429 53428 53433 53424 53431 53438 53433
53416 53445 53417 53458 53419 53431 53416 53416 53429 53429 53434 53419 53418 53437 53429
53417 53418 53417 53418 53418 53439 53415 53429 53429 53428 53438 53428 53417 53431 53432
53449 53442 53441 53460 53426 53425 53414 53421 53429 53428 53427 53417 53417 53436 53428
53446 53444 53420 53427 53419 53429 53415 53416 53428 53428 53431 53428 53417 53433 53432
53417 53446 53455 53417 53417 53430 53419 53429 53429 53423 53432 53418 53420 53438 53430
53447 53444 53418 53420 53417 53419 53416 53428 53428 53429 53435 53425 53417 53435 53432
53447 53452 53417 53450 53422 53429 53414 53424 53430 53428 53434 53417 53438 53436 53430
53416 53443 53420 53417 53417 53429 53414 53415 53429 53428 53430 53432 53417 53437 53431

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 53428 bytes 100%
1,000 53424 bytes -4 bytes 100%
10,000 53414 bytes -10 bytes 100%
100,000 53413 bytes -1 byte 2.03%
1,000,000 53407 bytes -6 bytes 0.87%
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
53577 bytes +170 bytes (+0.32%) +76 bytes
53501 bytes +94 bytes (+0.18%)
53520 bytes +113 bytes (+0.21%) +19 bytes
53554 bytes +147 bytes (+0.28%) +53 bytes
53573 bytes +166 bytes (+0.31%) +72 bytes
53576 bytes +169 bytes (+0.32%) +75 bytes
53571 bytes +164 bytes (+0.31%) +70 bytes
53612 bytes +205 bytes (+0.38%) +111 bytes
53635 bytes +228 bytes (+0.43%) +134 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 39295 bytes -14112 bytes (-26.42%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46892 bytes -6515 bytes (-12.20%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47818 bytes -5589 bytes (-10.46%)
Brotli (Wikipedia) brotli brotli -q 11 49324 bytes -4083 bytes (-7.65%)
LZMA2 (Wikipedia) xz xz -9 50416 bytes -2991 bytes (-5.60%)
Zstandard (Wikipedia) zstd zstd -19 51745 bytes -1662 bytes (-3.11%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51922 bytes -1485 bytes (-2.78%)

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 2019.
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