Choose a version:
26% The original file has 633680 bytes (618.8k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 164895 bytes (161.0k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  55553 bytes (54.3k)
 local copy
gzip -9
  55485 bytes (54.2k)
 local copy
libdeflate -12
  52857 bytes (51.6k)
 local copy
7zip -mx=9 -tgzip
  52799 bytes (51.6k)
 local copy
zultra
  52774 bytes (51.5k)
 local copy
pigz -11 -n
  52772 bytes (51.5k)
 local copy
kzip -s0 -rn -b1
  52753 bytes (51.5k)
 local copy
Zopfli
  52663 bytes (51.4k)
 local copy
Zopfli (defluff)
  52661 bytes (51.4k)
 local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.10.7.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.10.7 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 --i100000 --mb8 --mls2 --bsr7 --lazy --ohh

(found December 18, 2016)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 2  --mls2
block splitting recursion 7  --bsr7
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 2 more bytes (52661 bytes).
Download

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.10.7/dojo.js --location | md5sum
6fc888ec3fec477da944c2ba486d2760  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.10.7.min.zopfli.js.gz | md5sum
6fc888ec3fec477da944c2ba486d2760  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.10.7/dojo.js --location | sha1sum
8d2caad706894f673751a6fcedb9d6ea01e2ebba  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.10.7.min.zopfli.js.gz | sha1sum
8d2caad706894f673751a6fcedb9d6ea01e2ebba  -

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
52663 bytes -6 bytes zopfli --i100000 --mls2 --bsr7 --lazy --ohh December 18, 2016 @ 23:45
52669 bytes -7 bytes zopfli --i10000 --mls2 --bsr7 --lazy --ohh December 18, 2016 @ 22:49
52676 bytes -5 bytes zopfli --i1000 --mls2 --bsr7 --lazy --ohh December 18, 2016 @ 22:35
52681 bytes – zopfli --i100 --mls2 --bsr7 --lazy --ohh December 18, 2016 @ 22:25

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

Most recent activity on February 24, 2022 @ 16:14.

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
2 52672 52675 52677 52677 52671 52675 52681 52685 52675 52686 52687 52679 52686 52684 52685
4 52672 52675 52674 52671 52673 52678 52676 52675 52678 52680 52671 52671 52683 52703 52679
6 52674 52673 52678 52675 52680 52685 52683 52684 52684 52685 52675 52675 52681 52697 52688
7 52663 52714 52711 52673 52676 52678 52678 52676 52681 52678 52681 52676 52676 52683 52683
8 52673 52674 52675 52671 52674 52675 52687 52677 52674 52682 52685 52677 52687 52682 52682
9 52675 52675 52671 52671 52670 52677 52679 52688 52675 52684 52681 52684 52684 52697 52692
10 52666 52676 52675 52670 52671 52671 52679 52672 52679 52682 52678 52672 52680 52694 52688
11 52673 52671 52672 52670 52671 52668 52686 52687 52673 52684 52680 52676 52682 52680 52676
12 52674 52676 52671 52670 52672 52674 52673 52676 52679 52684 52678 52672 52679 52693 52686
13 52675 52674 52675 52679 52671 52690 52678 52676 52681 52684 52679 52672 52681 52685 52694
14 52671 52672 52671 52671 52670 52671 52677 52675 52674 52681 52681 52678 52680 52686 52697
15 52671 52674 52675 52667 52679 52671 52671 52687 52685 52684 52681 52670 52680 52680 52688
16 52670 52679 52672 52674 52676 52670 52672 52683 52682 52683 52677 52673 52681 52684 52685
17 52673 52678 52671 52671 52671 52671 52673 52676 52679 52682 52683 52676 52679 52691 52687
18 52676 52689 52672 52673 52671 52675 52687 52687 52679 52684 52683 52675 52684 52695 52675
19 52675 52677 52672 52670 52670 52670 52671 52677 52680 52685 52677 52675 52681 52694 52676
20 52676 52673 52677 52678 52671 52670 52678 52671 52680 52684 52681 52676 52681 52687 52695
21 52674 52676 52672 52666 52677 52690 52680 52687 52676 52680 52677 52676 52680 52691 52687
22 52676 52674 52672 52671 52676 52676 52677 52677 52680 52685 52678 52671 52687 52679 52687
23 52674 52666 52671 52671 52671 52671 52688 52687 52689 52685 52679 52672 52679 52684 52670
25 52672 52668 52671 52671 52676 52668 52679 52677 52676 52681 52680 52670 52683 52693 52673
30 52672 52672 52674 52664 52673 52670 52671 52676 52687 52681 52683 52672 52679 52686 52693
40 52671 52668 52675 52667 52671 52671 52674 52687 52684 52681 52679 52671 52679 52691 52680

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 52681 bytes – 100%
1,000 52676 bytes -5 bytes 100%
10,000 52669 bytes -7 bytes 100%
100,000 52663 bytes -6 bytes 3.19%
1,000,000 52663 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
(any) 52815 bytes +152 bytes (+0.29%) +62 bytes
1 52753 bytes +90 bytes (+0.17%) –
2 52777 bytes +114 bytes (+0.22%) +24 bytes
3 52797 bytes +134 bytes (+0.25%) +44 bytes
4 52815 bytes +152 bytes (+0.29%) +62 bytes
5 52841 bytes +178 bytes (+0.34%) +88 bytes
6 52879 bytes +216 bytes (+0.41%) +126 bytes
7 52917 bytes +254 bytes (+0.48%) +164 bytes
8 52930 bytes +267 bytes (+0.51%) +177 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 38787 bytes -13876 bytes (-26.35%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46260 bytes -6403 bytes (-12.16%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47164 bytes -5499 bytes (-10.44%)
Brotli (Wikipedia) brotli brotli -q 11 48622 bytes -4041 bytes (-7.67%)
LZMA2 (Wikipedia) xz xz -9 49712 bytes -2951 bytes (-5.60%)
Zstandard (Wikipedia) zstd zstd -19 51234 bytes -1429 bytes (-2.71%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51461 bytes -1202 bytes (-2.28%)

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):
Load and Parse Data


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 2026.
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.