Choose a version:
26% The original file has 639159 bytes (624.2k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 167874 bytes (163.9k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  56397 bytes (55.1k)
local copy
gzip -9
  56327 bytes (55.0k)
local copy
libdeflate -12
  53639 bytes (52.4k)
local copy
7zip -mx=9 -tgzip
  53627 bytes (52.4k)
local copy
kzip -s0 -rn -b1
  53550 bytes (52.3k)
local copy
zultra
  53547 bytes (52.3k)
local copy
pigz -11 -n
  53538 bytes (52.3k)
local copy
Zopfli
  53465 bytes (52.2k)
local copy
Zopfli (defluff)
  53464 bytes (52.2k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.14.7.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.14.7 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 --mls256 --bsr2 --lazy --ohh

(found June 17, 2020)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 256  --mls256
block splitting recursion 2  --bsr2
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 (53464 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.14.7/dojo.js --location | md5sum
9fed38f2d7f02a7d6217b8ef371a467d  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.14.7.min.zopfli.js.gz | md5sum
9fed38f2d7f02a7d6217b8ef371a467d  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.14.7/dojo.js --location | sha1sum
9b8a9a7efee8f88fc0f487c54334f96b192050be  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.14.7.min.zopfli.js.gz | sha1sum
9b8a9a7efee8f88fc0f487c54334f96b192050be  -

Other Versions

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

1.16.3, 1.16.2, 1.16.1, 1.16.0,
1.15.4, 1.15.3, 1.15.2, 1.15.1, 1.15.0,
1.14.7, 1.14.6, 1.14.5, 1.14.4, 1.14.3, 1.14.2, 1.14.1, 1.14.0,
1.13.5, 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,
1.11.8, 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
53465 bytes -1 byte zopfli --i1000000 --mls256 --bsr2 --lazy --ohh June 17, 2020 @ 17:10
53466 bytes -4 bytes zopfli --i10000 --mls256 --bsr2 --lazy --ohh June 16, 2020 @ 11:42
53470 bytes -1 byte zopfli --i10000 --mls64 --bsr10 --lazy --ohh June 15, 2020 @ 18:57
53471 bytes -1 byte zopfli --i10000 --mls128 --bsr40 --lazy --ohh June 15, 2020 @ 17:04
53472 bytes -1 byte zopfli --i10000 --mls64 --bsr2 --lazy --ohh June 15, 2020 @ 17:01
53473 bytes -1 byte zopfli --i10000 --mls8 --bsr13 --lazy --ohh June 15, 2020 @ 16:11
53474 bytes -3 bytes zopfli --i10000 --mls128 --bsr4 --lazy --ohh June 15, 2020 @ 14:58
53477 bytes -1 byte zopfli --i1000 --mls2 --bsr23 --lazy --ohh June 15, 2020 @ 12:01
53478 bytes -1 byte zopfli --i1000 --mls32 --bsr16 --lazy --ohh June 15, 2020 @ 11:59
53479 bytes -2 bytes zopfli --i1000 --mls256 --bsr22 --lazy --ohh June 15, 2020 @ 11:58
53481 bytes zopfli --i100 --mls32 --bsr40 --lazy --ohh June 15, 2020 @ 11:31

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

Most recent activity on July 20, 2020 @ 12:51.

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
53504 53504 53471 53475 53476 53472 53472 53465 53486 53492 53484 53478 53479 53494 53492
53507 53501 53473 53476 53478 53477 53474 53474 53480 53476 53476 53475 53479 53490 53484
53498 53497 53498 53476 53481 53478 53472 53481 53480 53478 53485 53492 53479 53485 53483
53507 53507 53507 53502 53484 53476 53479 53474 53479 53479 53482 53477 53482 53472 53480
53500 53496 53498 53504 53473 53477 53473 53474 53491 53488 53494 53484 53484 53484 53482
53497 53506 53482 53475 53477 53481 53474 53471 53479 53479 53494 53492 53480 53480 53482
53472 53499 53477 53505 53480 53467 53476 53473 53479 53478 53481 53474 53475 53491 53483
53486 53486 53473 53473 53473 53479 53474 53473 53479 53478 53481 53493 53481 53488 53478
53501 53497 53498 53480 53474 53472 53473 53474 53479 53479 53484 53492 53481 53479 53482
53500 53496 53473 53512 53476 53478 53472 53474 53479 53494 53485 53492 53475 53480 53481
53489 53487 53511 53504 53478 53477 53471 53474 53479 53480 53486 53480 53481 53485 53481
53500 53495 53472 53477 53476 53481 53471 53473 53479 53479 53486 53477 53478 53488 53491
53506 53498 53498 53505 53478 53479 53472 53480 53481 53475 53479 53492 53482 53479 53479
53495 53496 53508 53514 53478 53478 53472 53473 53480 53479 53480 53497 53483 53480 53489
53496 53505 53477 53504 53475 53481 53472 53479 53479 53479 53488 53492 53480 53482 53498
53489 53506 53474 53475 53478 53478 53472 53471 53479 53478 53484 53492 53482 53483 53481
53506 53497 53500 53476 53482 53476 53472 53479 53479 53479 53493 53493 53482 53484 53485
53500 53495 53501 53475 53478 53476 53472 53475 53479 53479 53484 53482 53482 53479 53491
53496 53507 53501 53475 53477 53478 53472 53474 53479 53478 53481 53492 53482 53474 53482
53468 53490 53501 53476 53475 53478 53472 53479 53479 53494 53490 53493 53474 53478 53486
53504 53497 53475 53473 53475 53476 53472 53479 53481 53481 53481 53480 53481 53485 53490
53495 53497 53504 53475 53478 53480 53472 53479 53479 53478 53494 53492 53480 53501 53488
53501 53495 53498 53476 53475 53478 53471 53480 53479 53478 53481 53494 53482 53479 53484

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 53481 bytes 100%
1,000 53477 bytes -4 bytes 100%
10,000 53466 bytes -11 bytes 100%
100,000 53466 bytes 0.87%
1,000,000 53465 bytes -1 byte 0.29%
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
53634 bytes +169 bytes (+0.32%) +84 bytes
53550 bytes +85 bytes (+0.16%)
53584 bytes +119 bytes (+0.22%) +34 bytes
53600 bytes +135 bytes (+0.25%) +50 bytes
53630 bytes +165 bytes (+0.31%) +80 bytes
53655 bytes +190 bytes (+0.36%) +105 bytes
53696 bytes +231 bytes (+0.43%) +146 bytes
53709 bytes +244 bytes (+0.46%) +159 bytes
53699 bytes +234 bytes (+0.44%) +149 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 39261 bytes -14204 bytes (-26.57%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46920 bytes -6545 bytes (-12.24%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47841 bytes -5624 bytes (-10.52%)
Brotli (Wikipedia) brotli brotli -q 11 49407 bytes -4058 bytes (-7.59%)
LZMA2 (Wikipedia) xz xz -9 50444 bytes -3021 bytes (-5.65%)
Zstandard (Wikipedia) zstd zstd -19 51782 bytes -1683 bytes (-3.15%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 52012 bytes -1453 bytes (-2.72%)

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 2020.
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.