Choose a version:
26% The original file has 641607 bytes (626.6k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 168231 bytes (164.3k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  56491 bytes (55.2k)
local copy
gzip -9
  56429 bytes (55.1k)
local copy
libdeflate -12
  53749 bytes (52.5k)
local copy
7zip -mx=9 -tgzip
  53721 bytes (52.5k)
local copy
kzip -s0 -rn -b1
  53645 bytes (52.4k)
local copy
pigz -11 -n
  53634 bytes (52.4k)
local copy
Zopfli
  53553 bytes (52.3k)
local copy
Zopfli (defluff)
  53550 bytes (52.3k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.16.1.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.16.1 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 --mls32 --bsr22 --lazy --ohh

(found February 21, 2020)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 32  --mls32
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 3 more bytes (53550 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.16.1/dojo.js --location | md5sum
f64a79ce070888cdb4c5d500e965393f  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.16.1.min.zopfli.js.gz | md5sum
f64a79ce070888cdb4c5d500e965393f  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.16.1/dojo.js --location | sha1sum
abeb527841301b12c1f9988b4dd8e4785d59f775  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.16.1.min.zopfli.js.gz | sha1sum
abeb527841301b12c1f9988b4dd8e4785d59f775  -

Other Versions

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

1.16.2, 1.16.1, 1.16.0,
1.15.3, 1.15.2, 1.15.1, 1.15.0,
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
53553 bytes -1 byte zopfli --i1000000 --mls32 --bsr22 --lazy --ohh February 21, 2020 @ 19:14
53554 bytes -1 byte zopfli --i1000000 --mls128 --bsr17 --lazy --ohh February 21, 2020 @ 01:32
53555 bytes -7 bytes zopfli --i100000 --mls128 --bsr17 --lazy --ohh February 20, 2020 @ 12:39
53562 bytes -2 bytes zopfli --i10000 --mls128 --bsr17 --lazy --ohh February 19, 2020 @ 22:13
53564 bytes -1 byte zopfli --i10000 --mls256 --bsr13 --lazy --ohh February 19, 2020 @ 21:30
53565 bytes -1 byte zopfli --i10000 --mls8 --bsr14 --lazy --ohh February 19, 2020 @ 19:34
53566 bytes -1 byte zopfli --i10000 --mls1024 --bsr7 --lazy --ohh February 19, 2020 @ 18:50
53567 bytes -1 byte zopfli --i1000 --mls128 --bsr16 --lazy --ohh February 19, 2020 @ 16:33
53568 bytes -1 byte zopfli --i1000 --mls128 --bsr19 --lazy --ohh February 19, 2020 @ 14:49
53569 bytes zopfli --i100 --mls64 --bsr2 --lazy --ohh February 19, 2020 @ 13:36

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

Most recent activity on February 25, 2020 @ 00:15.

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
53604 53583 53564 53565 53562 53563 53561 53560 53582 53585 53582 53567 53567 53598 53581
53605 53604 53606 53564 53566 53578 53564 53563 53572 53572 53569 53567 53565 53586 53567
53564 53564 53594 53564 53572 53570 53573 53573 53570 53577 53578 53583 53570 53574 53576
53596 53605 53599 53592 53580 53576 53569 53566 53570 53566 53571 53567 53571 53569 53577
53608 53596 53600 53565 53566 53579 53560 53563 53579 53570 53580 53573 53581 53579 53574
53602 53612 53567 53564 53563 53567 53563 53563 53570 53571 53588 53579 53572 53582 53569
53564 53593 53598 53603 53566 53582 53565 53573 53573 53572 53578 53562 53571 53583 53578
53600 53579 53567 53595 53565 53564 53562 53562 53572 53571 53579 53587 53572 53588 53570
53590 53602 53599 53603 53562 53563 53562 53562 53573 53570 53576 53573 53572 53571 53580
53593 53600 53593 53565 53563 53572 53562 53564 53571 53569 53577 53575 53573 53581 53571
53565 53579 53565 53600 53562 53563 53568 53562 53572 53572 53578 53587 53572 53578 53581
53593 53600 53566 53593 53564 53576 53558 53572 53570 53572 53576 53564 53572 53578 53578
53593 53599 53592 53565 53567 53578 53558 53572 53572 53571 53574 53575 53574 53571 53575
53590 53599 53599 53601 53567 53577 53554 53572 53570 53571 53586 53586 53571 53578 53581
53595 53566 53598 53592 53564 53565 53560 53563 53571 53575 53577 53582 53577 53586 53583
53563 53594 53567 53565 53565 53572 53562 53561 53570 53570 53583 53586 53572 53583 53579
53595 53564 53596 53564 53565 53567 53562 53572 53582 53570 53575 53565 53572 53587 53570
53589 53602 53600 53599 53565 53566 53562 53565 53570 53570 53579 53574 53577 53582 53576
53578 53600 53568 53565 53553 53582 53562 53572 53573 53570 53573 53565 53571 53582 53580
53564 53591 53554 53564 53564 53576 53560 53570 53574 53571 53573 53582 53572 53580 53580
53597 53596 53596 53600 53562 53578 53572 53564 53573 53572 53577 53575 53576 53582 53580
53592 53597 53593 53601 53567 53568 53562 53572 53572 53572 53582 53577 53581 53582 53581
53592 53596 53592 53564 53564 53579 53560 53573 53571 53569 53572 53582 53571 53583 53579

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 53569 bytes 100%
1,000 53567 bytes -2 bytes 100%
10,000 53559 bytes -8 bytes 100%
100,000 53555 bytes -4 bytes 1.45%
1,000,000 53553 bytes -2 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
53733 bytes +180 bytes (+0.34%) +88 bytes
53645 bytes +92 bytes (+0.17%)
53670 bytes +117 bytes (+0.22%) +25 bytes
53692 bytes +139 bytes (+0.26%) +47 bytes
53734 bytes +181 bytes (+0.34%) +89 bytes
53723 bytes +170 bytes (+0.32%) +78 bytes
53725 bytes +172 bytes (+0.32%) +80 bytes
53766 bytes +213 bytes (+0.40%) +121 bytes
53795 bytes +242 bytes (+0.45%) +150 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 39404 bytes -14149 bytes (-26.42%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 47010 bytes -6543 bytes (-12.22%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47919 bytes -5634 bytes (-10.52%)
Brotli (Wikipedia) brotli brotli -q 11 49452 bytes -4101 bytes (-7.66%)
LZMA2 (Wikipedia) xz xz -9 50500 bytes -3053 bytes (-5.70%)
Zstandard (Wikipedia) zstd zstd -19 51870 bytes -1683 bytes (-3.14%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 52249 bytes -1304 bytes (-2.43%)

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.