Choose a version:
26% The original file has 632585 bytes (617.8k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 165326 bytes (161.5k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  55781 bytes (54.5k)
 local copy
gzip -9
  55732 bytes (54.4k)
 local copy
libdeflate -12
  53088 bytes (51.8k)
 local copy
7zip -mx=9 -tgzip
  53067 bytes (51.8k)
 local copy
pigz -11 -n
  52998 bytes (51.8k)
 local copy
zultra
  52998 bytes (51.8k)
 local copy
kzip -s0 -rn -b1
  52985 bytes (51.7k)
 local copy
Zopfli
  52893 bytes (51.7k)
 local copy
Zopfli (defluff)
  52891 bytes (51.7k)
 local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.11.4.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.11.4 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 --mls16 --bsr13 --lazy --ohh

(found January 29, 2020)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 16  --mls16
block splitting recursion 13  --bsr13
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 (52891 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-1.11.4/dojo.js --location | md5sum
4d7e2ff7c91191cf8508a53de8450db2  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.11.4.min.zopfli.js.gz | md5sum
4d7e2ff7c91191cf8508a53de8450db2  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.11.4/dojo.js --location | sha1sum
d0259d25be1b63f909be7441d2f1512360c1c81d  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.11.4.min.zopfli.js.gz | sha1sum
d0259d25be1b63f909be7441d2f1512360c1c81d  -

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
52893 bytes -5 bytes zopfli --i1000000 --mls16 --bsr13 --lazy --ohh January 29, 2020 @ 22:46
52898 bytes -5 bytes zopfli --i100000 --mls16 --bsr13 --lazy --ohh March 21, 2017 @ 12:13
52903 bytes -2 bytes zopfli --i10000 --mls16 --bsr13 --lazy --ohh March 14, 2017 @ 08:36
52905 bytes -5 bytes zopfli --i10000 --mls16 --bsr15 --lazy --ohh March 14, 2017 @ 07:37
52910 bytes -4 bytes zopfli --i1000 --mls32 --bsr17 --lazy --ohh March 14, 2017 @ 04:19
52914 bytes – zopfli --i100 --mls32 --bsr17 --lazy --ohh March 11, 2017 @ 05:01

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

Most recent activity on March 9, 2022 @ 18:14.

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 52910 52911 52910 52911 52911 52908 52909 52920 52912 52917 52932 52911 52918 52937 52930
4 52911 52910 52918 52907 52906 52909 52910 52908 52910 52914 52912 52911 52917 52914 52919
6 52943 52908 52908 52907 52921 52920 52922 52911 52917 52918 52910 52914 52914 52915 52919
7 52907 52908 52942 52906 52921 52909 52911 52913 52919 52915 52909 52914 52912 52913 52914
8 52942 52941 52908 52907 52909 52921 52909 52909 52917 52916 52909 52915 52917 52913 52914
9 52905 52932 52909 52907 52905 52911 52895 52911 52923 52915 52912 52914 52913 52915 52921
10 52908 52943 52932 52905 52906 52908 52909 52906 52915 52915 52909 52912 52914 52913 52922
11 52909 52909 52941 52908 52906 52906 52909 52910 52911 52916 52912 52917 52912 52929 52918
12 52942 52909 52942 52944 52908 52907 52909 52907 52915 52915 52909 52911 52914 52910 52920
13 52939 52909 52909 52893 52906 52906 52907 52908 52913 52919 52912 52915 52917 52915 52918
14 52906 52942 52933 52906 52906 52906 52909 52908 52912 52915 52917 52909 52914 52919 52918
15 52940 52939 52941 52905 52905 52906 52911 52907 52910 52914 52945 52911 52912 52913 52923
16 52940 52942 52909 52905 52905 52906 52907 52907 52920 52915 52912 52913 52914 52913 52916
17 52940 52939 52940 52907 52905 52910 52906 52911 52912 52914 52912 52915 52914 52917 52916
18 52909 52932 52909 52908 52906 52909 52909 52908 52908 52915 52916 52911 52913 52913 52916
19 52909 52941 52909 52943 52908 52910 52907 52911 52912 52914 52915 52911 52916 52913 52921
20 52941 52909 52909 52907 52905 52909 52907 52917 52914 52915 52913 52912 52914 52921 52918
21 52942 52909 52909 52906 52906 52908 52906 52911 52914 52916 52912 52915 52913 52913 52920
22 52941 52941 52942 52908 52906 52906 52909 52909 52913 52916 52912 52911 52915 52916 52921
23 52909 52939 52941 52907 52906 52901 52910 52912 52912 52915 52909 52909 52914 52914 52918
25 52940 52902 52941 52905 52905 52905 52909 52911 52914 52915 52915 52916 52916 52913 52918
30 52936 52909 52906 52907 52906 52907 52911 52910 52911 52915 52915 52913 52916 52919 52922
40 52942 52942 52910 52906 52911 52907 52907 52908 52913 52914 52912 52916 52915 52921 52914

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 52914 bytes – 100%
1,000 52910 bytes -4 bytes 100%
10,000 52903 bytes -7 bytes 100%
100,000 52898 bytes -5 bytes 2.90%
1,000,000 52893 bytes -5 bytes 0.58%
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) 53070 bytes +177 bytes (+0.33%) +85 bytes
1 52985 bytes +92 bytes (+0.17%) –
2 52995 bytes +102 bytes (+0.19%) +10 bytes
3 53025 bytes +132 bytes (+0.25%) +40 bytes
4 53061 bytes +168 bytes (+0.32%) +76 bytes
5 53109 bytes +216 bytes (+0.41%) +124 bytes
6 53132 bytes +239 bytes (+0.45%) +147 bytes
7 53164 bytes +271 bytes (+0.51%) +179 bytes
8 53187 bytes +294 bytes (+0.56%) +202 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 38943 bytes -13950 bytes (-26.37%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46443 bytes -6450 bytes (-12.19%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47290 bytes -5603 bytes (-10.59%)
Brotli (Wikipedia) brotli brotli -q 11 48815 bytes -4078 bytes (-7.71%)
LZMA2 (Wikipedia) xz xz -9 49932 bytes -2961 bytes (-5.60%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51319 bytes -1574 bytes (-2.98%)
Zstandard (Wikipedia) zstd zstd -19 51418 bytes -1475 bytes (-2.79%)

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.