Choose a version:
26% The original file has 630117 bytes (615.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 164595 bytes (160.7k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  55579 bytes (54.3k)
local copy
gzip -9
  55522 bytes (54.2k)
local copy
libdeflate -12
  52869 bytes (51.6k)
local copy
7zip -mx=9 -tgzip
  52831 bytes (51.6k)
local copy
pigz -11 -n
  52799 bytes (51.6k)
local copy
kzip -s0 -rn -b1
  52790 bytes (51.6k)
local copy
Zopfli
  52697 bytes (51.5k)
local copy
Zopfli (defluff)
  52693 bytes (51.5k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.11.0.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.11.0 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 --bsr40 --lazy --ohh

(found March 22, 2016)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 32  --mls32
block splitting recursion 40  --bsr40
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 4 more bytes (52693 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.11.0/dojo.js --location | md5sum
de81bd1f2091dbfc94eb1fc631ec6a50  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.11.0.min.zopfli.js.gz | md5sum
de81bd1f2091dbfc94eb1fc631ec6a50  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.11.0/dojo.js --location | sha1sum
63e622f94c76c4b7b1663ad4baa948e7e93d11ed  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.11.0.min.zopfli.js.gz | sha1sum
63e622f94c76c4b7b1663ad4baa948e7e93d11ed  -

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
52697 bytes -4 bytes zopfli --i1000000 --mls32 --bsr40 --lazy --ohh March 22, 2016 @ 04:02
52701 bytes -1 byte zopfli --i100000 --mls32 --bsr40 --lazy --ohh March 21, 2016 @ 17:07
52702 bytes -1 byte zopfli --i100000 --mls2 --bsr11 --lazy --ohh March 21, 2016 @ 15:28
52703 bytes -1 byte zopfli --i100000 --mls128 --bsr2 --lazy --ohh March 21, 2016 @ 14:39
52704 bytes -3 bytes zopfli --i100000 --mls32 --bsr12 --lazy --ohh March 21, 2016 @ 13:39
52707 bytes -1 byte zopfli --i10000 --mls32 --bsr12 --lazy --ohh March 21, 2016 @ 12:19
52708 bytes -1 byte zopfli --i10000 --mls2 --bsr11 --lazy --ohh March 21, 2016 @ 10:54
52709 bytes -7 bytes zopfli --i10000 --mls128 --bsr10 --lazy --ohh March 21, 2016 @ 10:24
52716 bytes -2 bytes zopfli --i1000 --mls128 --bsr10 --lazy --ohh March 21, 2016 @ 10:18
52718 bytes -2 bytes zopfli --i1000 --mls8 --bsr25 --lazy --ohh March 21, 2016 @ 10:16
52720 bytes zopfli --i100 --mls8 --bsr25 --lazy --ohh March 21, 2016 @ 10:06

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 @ 14:40.

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
52711 52711 52711 52713 52712 52709 52703 52719 52716 52719 52723 52712 52724 52737 52730
52745 52713 52712 52710 52703 52710 52711 52719 52717 52714 52708 52713 52719 52717 52718
52748 52744 52711 52713 52711 52725 52723 52721 52721 52722 52707 52709 52711 52717 52726
52710 52746 52751 52713 52709 52702 52710 52717 52723 52718 52716 52712 52712 52712 52713
52742 52744 52711 52710 52712 52710 52713 52718 52721 52720 52714 52725 52722 52719 52723
52712 52710 52709 52712 52704 52710 52724 52709 52717 52722 52718 52712 52711 52716 52721
52710 52709 52743 52712 52710 52710 52709 52712 52716 52721 52716 52714 52710 52711 52723
52702 52711 52710 52709 52709 52709 52711 52711 52718 52720 52716 52712 52721 52711 52725
52742 52744 52710 52721 52704 52709 52710 52716 52722 52718 52717 52712 52719 52731 52724
52713 52744 52712 52712 52709 52709 52712 52710 52722 52720 52718 52712 52718 52720 52726
52698 52704 52711 52712 52707 52702 52726 52718 52716 52719 52717 52712 52720 52725 52725
52711 52744 52711 52711 52707 52709 52713 52716 52720 52718 52713 52706 52714 52711 52720
52744 52739 52740 52712 52709 52709 52713 52711 52717 52724 52713 52712 52716 52712 52721
52743 52745 52710 52712 52701 52709 52712 52718 52717 52721 52719 52716 52718 52716 52721
52712 52748 52711 52711 52709 52711 52712 52718 52716 52720 52716 52713 52714 52711 52721
52712 52750 52710 52714 52709 52711 52710 52711 52718 52718 52720 52712 52720 52720 52723
52710 52746 52711 52711 52709 52711 52712 52716 52718 52719 52717 52712 52719 52720 52720
52739 52745 52710 52741 52703 52709 52713 52714 52716 52721 52713 52712 52721 52717 52724
52742 52739 52710 52714 52709 52709 52711 52710 52716 52722 52717 52712 52718 52716 52719
52709 52704 52711 52712 52709 52714 52712 52709 52719 52721 52705 52712 52718 52710 52720
52712 52750 52710 52713 52709 52709 52710 52711 52716 52719 52714 52713 52711 52716 52719
52741 52741 52710 52711 52709 52710 52712 52713 52708 52719 52716 52711 52726 52719 52721
52743 52742 52712 52714 52697 52709 52709 52713 52716 52720 52708 52713 52718 52720 52724

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 52720 bytes 100%
1,000 52715 bytes -5 bytes 100%
10,000 52707 bytes -8 bytes 100%
100,000 52701 bytes -6 bytes 10.14%
1,000,000 52697 bytes -4 bytes 1.16%
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
52873 bytes +176 bytes (+0.33%) +83 bytes
52790 bytes +93 bytes (+0.18%)
52798 bytes +101 bytes (+0.19%) +8 bytes
52831 bytes +134 bytes (+0.25%) +41 bytes
52873 bytes +176 bytes (+0.33%) +83 bytes
52915 bytes +218 bytes (+0.41%) +125 bytes
52934 bytes +237 bytes (+0.45%) +144 bytes
52971 bytes +274 bytes (+0.52%) +181 bytes
52984 bytes +287 bytes (+0.54%) +194 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 38816 bytes -13881 bytes (-26.34%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46277 bytes -6420 bytes (-12.18%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47170 bytes -5527 bytes (-10.49%)
Brotli (Wikipedia) brotli brotli -q 11 48620 bytes -4077 bytes (-7.74%)
LZMA2 (Wikipedia) xz xz -9 49736 bytes -2961 bytes (-5.62%)
Zstandard (Wikipedia) zstd zstd -19 51239 bytes -1458 bytes (-2.77%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51378 bytes -1319 bytes (-2.50%)

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