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)
  56588 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
kzip -s0 -rn -b1
  53755 bytes (52.5k)
local copy
zultra
  53752 bytes (52.5k)
local copy
pigz -11 -n
  53736 bytes (52.5k)
local copy
Zopfli
  53661 bytes (52.4k)
local copy
Zopfli (defluff)
  53660 bytes (52.4k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.17.2.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.17.2 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 --bsr23 --lazy --ohh

(found March 23, 2022)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 128  --mls128
block splitting recursion 23  --bsr23
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 (53660 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.17.2/dojo.js --location | md5sum
53782d697ce50626341e0c072350ec00  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.17.2.min.zopfli.js.gz | md5sum
53782d697ce50626341e0c072350ec00  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.17.2/dojo.js --location | sha1sum
0e9715b26f47cd578a5c26facdfe53f48bf7f297  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.17.2.min.zopfli.js.gz | sha1sum
0e9715b26f47cd578a5c26facdfe53f48bf7f297  -

Other Versions

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

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 --bsr23 --lazy --ohh March 23, 2022 @ 18:36
53662 bytes -1 byte zopfli --i100000 --mls128 --bsr13 --lazy --ohh March 22, 2022 @ 09:36
53663 bytes -1 byte zopfli --i10000 --mls128 --bsr13 --lazy --ohh March 22, 2022 @ 08:43
53664 bytes -4 bytes zopfli --i10000 --mls128 --bsr8 --lazy --ohh March 22, 2022 @ 08:40
53668 bytes -1 byte zopfli --i10000 --mls64 --bsr6 --lazy --ohh March 22, 2022 @ 08:36
53669 bytes -4 bytes zopfli --i10000 --mls128 --bsr15 --lazy --ohh March 22, 2022 @ 08:36
53673 bytes -1 byte zopfli --i1000 --mls128 --bsr6 --lazy --ohh March 22, 2022 @ 07:54
53674 bytes -1 byte zopfli --i1000 --mls64 --bsr6 --lazy --ohh March 22, 2022 @ 07:49
53675 bytes -1 byte zopfli --i1000 --mls128 --bsr8 --lazy --ohh March 22, 2022 @ 07:48
53676 bytes -1 byte zopfli --i1000 --mls512 --bsr2 --lazy --ohh March 22, 2022 @ 07:48
53677 bytes zopfli --i100 --mls64 --bsr6 --lazy --ohh March 22, 2022 @ 07:43

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

Most recent activity on March 24, 2022 @ 07:12.

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 53705 53670 53671 53674 53668 53667 53672 53667 53667 53672 53674 53672 53696 53689
53701 53705 53674 53683 53681 53682 53671 53666 53678 53667 53674 53673 53681 53680 53677
53700 53671 53701 53668 53679 53668 53666 53677 53682 53677 53689 53676 53683 53681 53679
53703 53681 53704 53701 53674 53680 53674 53673 53680 53678 53690 53678 53680 53685 53680
53698 53694 53687 53684 53671 53680 53664 53670 53688 53677 53686 53685 53678 53683 53685
53696 53674 53703 53666 53669 53673 53666 53664 53681 53677 53684 53674 53679 53687 53681
53683 53696 53679 53699 53669 53682 53667 53670 53678 53677 53688 53670 53679 53688 53687
53684 53682 53684 53700 53671 53665 53662 53667 53677 53677 53681 53675 53682 53681 53679
53698 53698 53701 53674 53666 53666 53662 53671 53677 53677 53678 53677 53679 53679 53686
53693 53700 53682 53672 53670 53671 53662 53666 53678 53677 53679 53675 53679 53682 53680
53683 53685 53706 53708 53668 53668 53667 53666 53679 53679 53678 53674 53682 53682 53677
53685 53682 53681 53698 53670 53681 53669 53678 53681 53678 53685 53676 53678 53682 53682
53698 53697 53698 53667 53670 53682 53662 53678 53678 53677 53680 53674 53679 53679 53681
53700 53697 53698 53669 53670 53679 53680 53677 53678 53677 53692 53692 53679 53682 53686
53683 53682 53683 53695 53666 53670 53662 53669 53678 53677 53682 53687 53682 53683 53687
53684 53689 53684 53668 53671 53683 53664 53670 53677 53678 53688 53679 53679 53681 53679
53684 53686 53684 53670 53668 53669 53686 53677 53679 53677 53687 53674 53680 53687 53685
53695 53699 53697 53702 53665 53664 53666 53665 53677 53677 53688 53686 53679 53680 53680
53682 53682 53704 53672 53670 53680 53662 53677 53680 53678 53691 53678 53679 53681 53680
53684 53694 53682 53670 53670 53680 53661 53665 53680 53677 53685 53692 53679 53682 53681
53696 53695 53692 53704 53669 53682 53682 53666 53679 53679 53687 53680 53680 53680 53677
53697 53704 53688 53706 53672 53680 53663 53677 53679 53677 53684 53665 53678 53680 53678
53699 53703 53695 53702 53669 53680 53663 53669 53682 53677 53690 53688 53678 53684 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 53677 bytes 100%
1,000 53673 bytes -4 bytes 100%
10,000 53663 bytes -10 bytes 100%
100,000 53662 bytes -1 byte 2.61%
1,000,000 53661 bytes -1 byte 2.03%
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
53831 bytes +170 bytes (+0.32%) +76 bytes
53755 bytes +94 bytes (+0.18%)
53779 bytes +118 bytes (+0.22%) +24 bytes
53806 bytes +145 bytes (+0.27%) +51 bytes
53830 bytes +169 bytes (+0.31%) +75 bytes
53863 bytes +202 bytes (+0.38%) +108 bytes
53888 bytes +227 bytes (+0.42%) +133 bytes
53910 bytes +249 bytes (+0.46%) +155 bytes
53907 bytes +246 bytes (+0.46%) +152 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 47086 bytes -6575 bytes (-12.25%)
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 52188 bytes -1473 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 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.