Choose a version:
26% The original file has 632446 bytes (617.6k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 164699 bytes (160.8k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  55505 bytes (54.2k)
local copy
gzip -9
  55439 bytes (54.1k)
local copy
libdeflate -12
  52790 bytes (51.6k)
local copy
7zip -mx=9 -tgzip
  52761 bytes (51.5k)
local copy
pigz -11 -n
  52729 bytes (51.5k)
local copy
kzip -s0 -rn -b1
  52712 bytes (51.5k)
local copy
Zopfli
  52620 bytes (51.4k)
local copy
Zopfli (defluff)
  52617 bytes (51.4k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.10.6.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.10.6 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 --mls2 --bsr12 --lazy --ohh

(found June 13, 2016)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 2  --mls2
block splitting recursion 12  --bsr12
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 (52617 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.10.6/dojo.js --location | md5sum
6baf61b056e48330cfb918606c6581b9  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.10.6.min.zopfli.js.gz | md5sum
6baf61b056e48330cfb918606c6581b9  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.10.6/dojo.js --location | sha1sum
ffb86c4eff3c81e3473e6272ab9e6483315a4c4d  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.10.6.min.zopfli.js.gz | sha1sum
ffb86c4eff3c81e3473e6272ab9e6483315a4c4d  -

Other Versions

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

1.14.2, 1.14.1, 1.14.0,
1.13.3, 1.13.2, 1.13.1, 1.13.0,
1.12.4, 1.12.3, 1.12.2, 1.12.1,
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
52620 bytes -2 bytes zopfli --i1000000 --mls2 --bsr12 --lazy --ohh June 13, 2016 @ 13:28
52622 bytes -4 bytes zopfli --i100000 --mls2 --bsr12 --lazy --ohh June 10, 2016 @ 20:08
52626 bytes -4 bytes zopfli --i100000 --mls8192 --bsr22 --lazy --ohh June 10, 2016 @ 09:52
52630 bytes -6 bytes zopfli --i10000 --mls8192 --bsr22 --lazy --ohh June 10, 2016 @ 08:52
52636 bytes -1 byte zopfli --i1000 --mls8192 --bsr22 --lazy --ohh June 10, 2016 @ 08:45
52637 bytes -1 byte zopfli --i1000 --mls2 --bsr30 --lazy --ohh June 10, 2016 @ 08:44
52638 bytes -3 bytes zopfli --i1000 --mls4096 --bsr9 --lazy --ohh June 10, 2016 @ 08:41
52641 bytes zopfli --i100 --mls2 --bsr7 --lazy --ohh June 9, 2016 @ 17:56

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

Most recent activity on June 16, 2016 @ 14:33.

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
52633 52634 52634 52635 52631 52632 52643 52642 52637 52644 52633 52638 52638 52644 52644
52630 52635 52634 52633 52633 52637 52639 52651 52637 52637 52639 52631 52639 52660 52635
52632 52633 52636 52636 52634 52648 52643 52644 52632 52643 52633 52645 52639 52642 52650
52630 52634 52631 52635 52636 52637 52630 52638 52639 52638 52635 52631 52632 52639 52657
52632 52633 52686 52632 52635 52629 52637 52633 52633 52640 52638 52645 52644 52642 52643
52633 52633 52631 52632 52630 52631 52633 52646 52634 52643 52638 52633 52642 52640 52651
52631 52634 52632 52632 52632 52631 52635 52632 52638 52639 52641 52632 52631 52652 52646
52634 52633 52635 52631 52631 52628 52647 52647 52642 52643 52638 52643 52638 52651 52645
52620 52634 52634 52641 52631 52635 52633 52634 52643 52643 52637 52642 52677 52655 52643
52632 52634 52635 52632 52631 52645 52638 52634 52640 52644 52637 52632 52639 52643 52643
52631 52633 52636 52633 52636 52632 52638 52635 52635 52642 52640 52635 52633 52645 52653
52631 52637 52635 52632 52636 52630 52633 52636 52641 52643 52641 52631 52638 52641 52643
52632 52635 52631 52636 52635 52628 52632 52648 52647 52642 52639 52636 52640 52643 52650
52634 52636 52632 52632 52632 52633 52633 52636 52633 52641 52642 52646 52638 52653 52645
52637 52636 52633 52638 52631 52635 52637 52647 52641 52643 52641 52635 52635 52653 52646
52632 52636 52633 52631 52631 52633 52631 52634 52639 52639 52635 52630 52679 52641 52646
52634 52634 52632 52631 52631 52631 52637 52629 52636 52643 52636 52636 52637 52647 52653
52632 52634 52630 52635 52636 52647 52638 52649 52630 52639 52639 52633 52633 52653 52645
52634 52633 52634 52633 52635 52648 52638 52637 52633 52642 52639 52634 52626 52638 52645
52631 52631 52630 52630 52631 52629 52634 52647 52648 52642 52642 52637 52629 52640 52647
52631 52633 52632 52632 52636 52632 52647 52647 52632 52640 52640 52631 52639 52650 52645
52630 52633 52631 52631 52637 52638 52632 52648 52648 52641 52640 52629 52634 52642 52652
52632 52633 52631 52632 52631 52628 52633 52647 52634 52640 52638 52636 52677 52642 52645

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 52641 bytes 100%
1,000 52636 bytes -5 bytes 100%
10,000 52626 bytes -10 bytes 100%
100,000 52622 bytes -4 bytes 0.58%
1,000,000 52620 bytes -2 bytes 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
52783 bytes +163 bytes (+0.31%) +71 bytes
52712 bytes +92 bytes (+0.17%)
52740 bytes +120 bytes (+0.23%) +28 bytes
52759 bytes +139 bytes (+0.26%) +47 bytes
52774 bytes +154 bytes (+0.29%) +62 bytes
52806 bytes +186 bytes (+0.35%) +94 bytes
52843 bytes +223 bytes (+0.42%) +131 bytes
52884 bytes +264 bytes (+0.50%) +172 bytes
52901 bytes +281 bytes (+0.53%) +189 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 38753 bytes -13867 bytes (-26.35%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46223 bytes -6397 bytes (-12.16%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47101 bytes -5519 bytes (-10.49%)
Brotli (Wikipedia) brotli brotli -q 11 48539 bytes -4081 bytes (-7.76%)
LZMA2 (Wikipedia) xz xz -9 49656 bytes -2964 bytes (-5.63%)
Zstandard (Wikipedia) zstd zstd -19 51189 bytes -1431 bytes (-2.72%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51443 bytes -1177 bytes (-2.24%)

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 2018.
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