Choose a version:
26% The original file has 642546 bytes (627.5k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 168845 bytes (164.9k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  56589 bytes (55.3k)
local copy
gzip -9
  56521 bytes (55.2k)
local copy
libdeflate -12
  53840 bytes (52.6k)
local copy
7zip -mx=9 -tgzip
  53828 bytes (52.6k)
local copy
zultra
  53752 bytes (52.5k)
local copy
kzip -s0 -rn -b1
  53750 bytes (52.5k)
local copy
pigz -11 -n
  53736 bytes (52.5k)
local copy
Zopfli
  53661 bytes (52.4k)
local copy
Zopfli (defluff)
  53656 bytes (52.4k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.17.3.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.17.3 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 --mls128 --bsr8 --lazy --ohh

(found August 22, 2022)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 128  --mls128
block splitting recursion 8  --bsr8
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 5 more bytes (53656 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.17.3/dojo.js --location | md5sum
4860b118960dc39c555583b6f1078189  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.17.3.min.zopfli.js.gz | md5sum
4860b118960dc39c555583b6f1078189  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.17.3/dojo.js --location | sha1sum
e71018f0d89db642fa4f3b342278c73bd95dfdb8  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.17.3.min.zopfli.js.gz | sha1sum
e71018f0d89db642fa4f3b342278c73bd95dfdb8  -

Other Versions

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

1.17.3, 1.17.2, 1.17.1, 1.17.0,
1.16.5, 1.16.4, 1.16.3, 1.16.2, 1.16.1, 1.16.0,
1.15.6, 1.15.5, 1.15.4, 1.15.3, 1.15.2, 1.15.1, 1.15.0,
1.14.9, 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,
1.13.10, 1.13.9, 1.13.8, 1.13.7, 1.13.6, 1.13.5, 1.13.4, 1.13.3, 1.13.2, 1.13.1, 1.13.0,
1.12.11, 1.12.10, 1.12.9, 1.12.8, 1.12.7, 1.12.6, 1.12.5, 1.12.4, 1.12.3, 1.12.2, 1.12.1,
1.11.13, 1.11.12, 1.11.11, 1.11.10, 1.11.9, 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
53661 bytes -1 byte zopfli --i1000000 --mls128 --bsr8 --lazy --ohh August 22, 2022 @ 16:05
53662 bytes -2 bytes zopfli --i100000 --mls64 --bsr6 --lazy --ohh August 19, 2022 @ 15:37
53664 bytes -4 bytes zopfli --i10000 --mls32 --bsr10 --lazy --ohh August 19, 2022 @ 15:26
53668 bytes -6 bytes zopfli --i10000 --mls64 --bsr6 --lazy --ohh August 19, 2022 @ 15:02
53674 bytes -1 byte zopfli --i1000 --mls64 --bsr6 --lazy --ohh August 19, 2022 @ 14:43
53675 bytes -1 byte zopfli --i1000 --mls32 --bsr10 --lazy --ohh August 19, 2022 @ 14:37
53676 bytes -2 bytes zopfli --i1000 --mls32 --bsr23 --lazy --ohh August 19, 2022 @ 14:37
53678 bytes zopfli --i100 --mls32 --bsr23 --lazy --ohh August 19, 2022 @ 14:33

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

Most recent activity on August 23, 2022 @ 10:40.

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
53702 53706 53670 53670 53674 53668 53666 53669 53671 53667 53672 53668 53674 53698 53689
53693 53705 53674 53683 53681 53682 53667 53666 53678 53667 53674 53674 53678 53680 53676
53699 53669 53701 53670 53676 53662 53666 53677 53681 53677 53689 53675 53682 53681 53679
53702 53681 53704 53701 53670 53676 53674 53673 53680 53678 53691 53675 53680 53684 53678
53697 53693 53687 53684 53670 53680 53661 53670 53686 53677 53686 53686 53680 53681 53686
53695 53675 53674 53671 53669 53669 53668 53663 53681 53677 53682 53671 53681 53687 53681
53682 53696 53679 53699 53664 53682 53669 53669 53680 53677 53687 53675 53679 53692 53686
53684 53682 53684 53701 53670 53664 53665 53667 53677 53677 53681 53674 53678 53682 53680
53698 53698 53701 53674 53669 53665 53665 53670 53677 53677 53678 53678 53679 53680 53686
53693 53699 53682 53672 53670 53671 53665 53666 53678 53677 53678 53675 53679 53682 53680
53683 53684 53705 53708 53666 53668 53669 53667 53679 53678 53679 53674 53679 53682 53677
53684 53683 53681 53699 53672 53679 53668 53678 53681 53678 53682 53678 53678 53682 53681
53698 53697 53698 53667 53672 53681 53665 53678 53678 53677 53680 53674 53679 53678 53683
53700 53697 53698 53669 53672 53679 53680 53678 53678 53677 53691 53692 53679 53681 53686
53683 53682 53683 53695 53668 53680 53665 53671 53678 53677 53687 53688 53680 53684 53687
53684 53689 53683 53667 53671 53683 53664 53669 53678 53678 53688 53679 53679 53682 53679
53684 53686 53683 53670 53669 53668 53686 53677 53679 53677 53686 53677 53680 53688 53684
53699 53702 53696 53701 53665 53664 53666 53668 53677 53678 53691 53686 53679 53680 53679
53682 53681 53705 53672 53670 53680 53665 53677 53678 53678 53690 53678 53679 53681 53680
53684 53692 53682 53671 53670 53680 53661 53665 53681 53677 53683 53692 53679 53680 53679
53695 53695 53692 53703 53670 53681 53682 53667 53680 53679 53687 53680 53680 53681 53678
53697 53703 53688 53705 53669 53680 53665 53677 53678 53677 53684 53665 53678 53680 53678
53699 53703 53695 53702 53669 53680 53663 53670 53681 53677 53694 53688 53678 53685 53684

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 53678 bytes 100%
1,000 53674 bytes -4 bytes 100%
10,000 53663 bytes -11 bytes 100%
100,000 53662 bytes -1 byte 1.74%
1,000,000 53661 bytes -1 byte 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
53826 bytes +165 bytes (+0.31%) +76 bytes
53750 bytes +89 bytes (+0.17%)
53775 bytes +114 bytes (+0.21%) +25 bytes
53798 bytes +137 bytes (+0.26%) +48 bytes
53826 bytes +165 bytes (+0.31%) +76 bytes
53858 bytes +197 bytes (+0.37%) +108 bytes
53892 bytes +231 bytes (+0.43%) +142 bytes
53902 bytes +241 bytes (+0.45%) +152 bytes
53899 bytes +238 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 39442 bytes -14219 bytes (-26.50%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 47083 bytes -6578 bytes (-12.26%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 48029 bytes -5632 bytes (-10.50%)
Brotli (Wikipedia) brotli brotli -q 11 49538 bytes -4123 bytes (-7.68%)
LZMA2 (Wikipedia) xz xz -9 50620 bytes -3041 bytes (-5.67%)
Zstandard (Wikipedia) zstd zstd -19 51964 bytes -1697 bytes (-3.16%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 52198 bytes -1463 bytes (-2.73%)

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 2022.
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.