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
  53549 bytes (52.3k)
local copy
zultra
  53547 bytes (52.3k)
local copy
pigz -11 -n
  53540 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-1.14.8.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.14.8 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 --bsr2 --lazy --ohh

(found March 23, 2021)
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-1.14.8/dojo.js --location | md5sum
2eb4361b62c6027eb158beacc8c436e1  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.14.8.min.zopfli.js.gz | md5sum
2eb4361b62c6027eb158beacc8c436e1  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.14.8/dojo.js --location | sha1sum
7e9a5c42bccb18e3e96d9dbe2f697b87e501db37  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.14.8.min.zopfli.js.gz | sha1sum
7e9a5c42bccb18e3e96d9dbe2f697b87e501db37  -

Other Versions

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

1.16.4, 1.16.3, 1.16.2, 1.16.1, 1.16.0,
1.15.5, 1.15.4, 1.15.3, 1.15.2, 1.15.1, 1.15.0,
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,
1.13.5, 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 March 23, 2021 @ 21:28
53466 bytes -1 byte zopfli --i100000 --mls256 --bsr2 --lazy --ohh March 23, 2021 @ 12:41
53467 bytes -2 bytes zopfli --i10000 --mls256 --bsr2 --lazy --ohh March 22, 2021 @ 19:14
53469 bytes -1 byte zopfli --i10000 --mls2 --bsr10 --lazy --ohh March 22, 2021 @ 19:09
53470 bytes -7 bytes zopfli --i10000 --mls4096 --bsr10 --lazy --ohh March 22, 2021 @ 17:03
53477 bytes -1 byte zopfli --i1000 --mls2 --bsr23 --lazy --ohh March 22, 2021 @ 16:55
53478 bytes -1 byte zopfli --i1000 --mls2 --bsr10 --lazy --ohh March 22, 2021 @ 15:45
53479 bytes -2 bytes zopfli --i1000 --mls32 --bsr16 --lazy --ohh March 22, 2021 @ 15:36
53481 bytes zopfli --i100 --mls16 --bsr30 --lazy --ohh March 22, 2021 @ 15:21

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

Most recent activity on March 24, 2021 @ 12:34.

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
53504 53504 53471 53476 53475 53471 53473 53465 53489 53492 53484 53478 53479 53495 53492
53508 53500 53475 53475 53477 53477 53475 53474 53480 53476 53478 53480 53479 53488 53482
53498 53503 53500 53473 53481 53479 53472 53483 53479 53479 53489 53493 53480 53486 53484
53508 53507 53507 53503 53483 53476 53479 53475 53478 53479 53481 53477 53482 53473 53480
53501 53496 53498 53504 53473 53478 53473 53474 53491 53489 53493 53488 53488 53485 53485
53497 53507 53481 53475 53476 53482 53474 53471 53478 53479 53494 53492 53482 53479 53482
53467 53499 53476 53503 53481 53471 53476 53474 53479 53480 53485 53470 53476 53488 53483
53487 53486 53477 53474 53473 53479 53474 53474 53478 53479 53485 53493 53480 53485 53482
53503 53496 53498 53480 53473 53472 53471 53475 53479 53479 53488 53492 53481 53479 53483
53500 53495 53475 53513 53476 53478 53471 53474 53479 53495 53485 53492 53475 53482 53478
53490 53487 53502 53503 53476 53477 53471 53474 53480 53480 53482 53484 53481 53485 53481
53500 53495 53472 53477 53475 53481 53471 53474 53480 53480 53485 53478 53480 53490 53489
53506 53498 53498 53506 53478 53481 53471 53480 53481 53476 53481 53492 53482 53479 53481
53496 53498 53510 53514 53476 53478 53472 53473 53479 53479 53480 53497 53482 53480 53485
53495 53506 53476 53504 53475 53482 53471 53479 53479 53479 53484 53492 53480 53486 53497
53486 53507 53477 53475 53476 53478 53472 53471 53480 53479 53488 53492 53481 53487 53482
53507 53504 53500 53477 53480 53487 53471 53479 53479 53479 53493 53493 53482 53484 53486
53500 53494 53502 53475 53479 53475 53471 53475 53479 53479 53487 53483 53481 53479 53487
53495 53506 53501 53476 53477 53478 53471 53474 53480 53478 53481 53492 53482 53474 53482
53470 53490 53501 53477 53475 53478 53473 53480 53479 53494 53490 53492 53477 53479 53488
53503 53497 53476 53474 53475 53476 53472 53480 53482 53485 53485 53482 53483 53485 53486
53494 53496 53504 53476 53479 53481 53471 53479 53478 53479 53494 53492 53480 53491 53488
53503 53495 53498 53476 53473 53478 53471 53480 53479 53479 53480 53494 53482 53480 53483

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 53467 bytes -10 bytes 100%
100,000 53466 bytes -1 byte 0.58%
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
53639 bytes +174 bytes (+0.33%) +90 bytes
53549 bytes +84 bytes (+0.16%)
53582 bytes +117 bytes (+0.22%) +33 bytes
53601 bytes +136 bytes (+0.25%) +52 bytes
53637 bytes +172 bytes (+0.32%) +88 bytes
53662 bytes +197 bytes (+0.37%) +113 bytes
53682 bytes +217 bytes (+0.41%) +133 bytes
53698 bytes +233 bytes (+0.44%) +149 bytes
53702 bytes +237 bytes (+0.44%) +153 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 39262 bytes -14203 bytes (-26.57%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46917 bytes -6548 bytes (-12.25%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47841 bytes -5624 bytes (-10.52%)
Brotli (Wikipedia) brotli brotli -q 11 49408 bytes -4057 bytes (-7.59%)
LZMA2 (Wikipedia) xz xz -9 50448 bytes -3017 bytes (-5.64%)
Zstandard (Wikipedia) zstd zstd -19 51784 bytes -1681 bytes (-3.14%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51996 bytes -1469 bytes (-2.75%)

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 2021.
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.