Choose a version:
26% The original file has 633111 bytes (618.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 165941 bytes (162.1k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  55933 bytes (54.6k)
local copy
gzip -9
  55876 bytes (54.6k)
local copy
libdeflate -12
  53235 bytes (52.0k)
local copy
7zip -mx=9 -tgzip
  53213 bytes (52.0k)
local copy
zultra
  53144 bytes (51.9k)
local copy
kzip -s0 -rn -b1
  53143 bytes (51.9k)
local copy
pigz -11 -n
  53142 bytes (51.9k)
local copy
Zopfli
  53043 bytes (51.8k)
local copy
Zopfli (defluff)
  53042 bytes (51.8k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.12.10.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.12.10 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 --mls8 --bsr40 --lazy --ohh

(found March 4, 2022)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 8  --mls8
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 1 more byte (53042 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.12.10/dojo.js --location | md5sum
51c0a31f33b9b773c4281b614371c8c5  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.10.min.zopfli.js.gz | md5sum
51c0a31f33b9b773c4281b614371c8c5  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.12.10/dojo.js --location | sha1sum
ba34075e086f27e18acee032e88c857442572230  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.10.min.zopfli.js.gz | sha1sum
ba34075e086f27e18acee032e88c857442572230  -

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
53043 bytes -1 byte zopfli --i100000 --mls8 --bsr40 --lazy --ohh March 4, 2022 @ 21:10
53044 bytes -6 bytes zopfli --i100000 --mls8 --bsr14 --lazy --ohh March 4, 2022 @ 15:34
53050 bytes -1 byte zopfli --i10000 --mls8 --bsr14 --lazy --ohh February 26, 2022 @ 11:26
53051 bytes -2 bytes zopfli --i10000 --mls64 --bsr10 --lazy --ohh February 25, 2022 @ 14:57
53053 bytes -2 bytes zopfli --i10000 --mls8 --bsr6 --lazy --ohh February 25, 2022 @ 05:46
53055 bytes -1 byte zopfli --i1000 --mls32 --bsr8 --lazy --ohh February 24, 2022 @ 23:11
53056 bytes -1 byte zopfli --i1000 --mls4 --bsr14 --lazy --ohh February 24, 2022 @ 20:42
53057 bytes -1 byte zopfli --i1000 --mls32 --bsr25 --lazy --ohh February 24, 2022 @ 17:36
53058 bytes zopfli --i100 --mls16 --bsr11 --lazy --ohh February 24, 2022 @ 16:41

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

Most recent activity on March 8, 2022 @ 18:50.

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
53057 53055 53055 53057 53056 53057 53056 53055 53055 53055 53064 53056 53062 53082 53092
53092 53054 53056 53053 53055 53055 53051 53054 53059 53065 53063 53057 53060 53064 53078
53093 53093 53053 53055 53060 53057 53052 53054 53060 53074 53073 53062 53063 53064 53059
53089 53087 53062 53093 53054 53052 53055 53052 53060 53061 53076 53062 53056 53078 53059
53085 53082 53052 53098 53051 53067 53052 53055 53065 53103 53065 53054 53069 53065 53065
53096 53082 53055 53058 53054 53056 53043 53054 53059 53073 53063 53056 53066 53064 53070
53095 53083 53054 53091 53055 53051 53060 53052 53059 53064 53077 53056 53069 53065 53069
53086 53076 53053 53053 53057 53054 53051 53053 53056 53067 53064 53062 53065 53072 53066
53056 53054 53051 53085 53056 53064 53055 53055 53059 53063 53064 53064 53064 53069 53065
53089 53078 53055 53055 53057 53062 53043 53055 53059 53065 53062 53055 53067 53080 53065
53051 53051 53044 53090 53056 53056 53056 53055 53059 53065 53074 53062 53066 53072 53065
53087 53088 53051 53056 53052 53058 53043 53054 53059 53064 53076 53062 53065 53079 53060
53057 53078 53056 53090 53054 53057 53056 53056 53060 53066 53061 53055 53066 53065 53060
53090 53072 53056 53085 53054 53055 53055 53059 53060 53070 53063 53061 53069 53061 53064
53086 53084 53056 53055 53054 53057 53051 53059 53059 53065 53076 53062 53065 53069 53065
53089 53092 53051 53052 53054 53071 53056 53053 53061 53063 53064 53064 53066 53067 53071
53087 53094 53052 53052 53057 53055 53056 53059 53060 53065 53076 53062 53064 53074 53073
53085 53081 53053 53052 53059 53070 53058 53054 53060 53066 53066 53057 53069 53061 53073
53086 53081 53044 53052 53058 53063 53055 53054 53060 53064 53079 53061 53064 53058 53066
53089 53081 53052 53092 53054 53054 53055 53053 53060 53064 53066 53056 53064 53078 53072
53087 53081 53056 53055 53053 53057 53056 53059 53060 53066 53064 53062 53067 53075 53069
53084 53076 53054 53053 53053 53048 53051 53053 53060 53063 53061 53063 53066 53061 53070
53085 53094 53043 53055 53052 53050 53056 53053 53059 53063 53076 53061 53069 53061 53064

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 53058 bytes 100%
1,000 53055 bytes -3 bytes 100%
10,000 53050 bytes -5 bytes 100%
100,000 53043 bytes -7 bytes 2.90%
1,000,000 53043 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
53167 bytes +124 bytes (+0.23%) +24 bytes
53143 bytes +100 bytes (+0.19%)
53172 bytes +129 bytes (+0.24%) +29 bytes
53190 bytes +147 bytes (+0.28%) +47 bytes
53225 bytes +182 bytes (+0.34%) +82 bytes
53247 bytes +204 bytes (+0.38%) +104 bytes
53292 bytes +249 bytes (+0.47%) +149 bytes
53312 bytes +269 bytes (+0.51%) +169 bytes
53299 bytes +256 bytes (+0.48%) +156 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 38989 bytes -14054 bytes (-26.50%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46543 bytes -6500 bytes (-12.25%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47516 bytes -5527 bytes (-10.42%)
Brotli (Wikipedia) brotli brotli -q 11 48947 bytes -4096 bytes (-7.72%)
LZMA2 (Wikipedia) xz xz -9 50044 bytes -2999 bytes (-5.65%)
Zstandard (Wikipedia) zstd zstd -19 51364 bytes -1679 bytes (-3.17%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51571 bytes -1472 bytes (-2.78%)

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.