Choose a version:
26% The original file has 632881 bytes (618.0k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 165774 bytes (161.9k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  55865 bytes (54.6k)
local copy
gzip -9
  55813 bytes (54.5k)
local copy
libdeflate -12
  53163 bytes (51.9k)
local copy
7zip -mx=9 -tgzip
  53143 bytes (51.9k)
local copy
pigz -11 -n
  53074 bytes (51.8k)
local copy
zultra
  53074 bytes (51.8k)
local copy
kzip -s0 -rn -b1
  53070 bytes (51.8k)
local copy
Zopfli
  52973 bytes (51.7k)
local copy
Zopfli (defluff)
  52968 bytes (51.7k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.12.7.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.12.7 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 --i1000000 --mb8 --mls64 --bsr30 --lazy --ohh

(found March 9, 2022)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 64  --mls64
block splitting recursion 30  --bsr30
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 (52968 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.12.7/dojo.js --location | md5sum
224b4abe9fd69972a0b39f01b4b69d15  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.7.min.zopfli.js.gz | md5sum
224b4abe9fd69972a0b39f01b4b69d15  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.12.7/dojo.js --location | sha1sum
b5d9a973c72fba33f338294b525fe12e7734bb03  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.7.min.zopfli.js.gz | sha1sum
b5d9a973c72fba33f338294b525fe12e7734bb03  -

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
52973 bytes -1 byte zopfli --i1000000 --mls64 --bsr30 --lazy --ohh March 9, 2022 @ 18:27
52974 bytes -1 byte zopfli --i100000 --mls64 --bsr30 --lazy --ohh March 5, 2022 @ 20:47
52975 bytes -7 bytes zopfli --i100000 --mls128 --bsr13 --lazy --ohh March 4, 2022 @ 13:44
52982 bytes -1 byte zopfli --i10000 --mls128 --bsr13 --lazy --ohh February 27, 2022 @ 23:20
52983 bytes -4 bytes zopfli --i10000 --mls8 --bsr16 --lazy --ohh February 25, 2022 @ 06:41
52987 bytes -2 bytes zopfli --i1000 --mls256 --bsr16 --lazy --ohh February 24, 2022 @ 17:23
52989 bytes -1 byte zopfli --i1000 --mls8 --bsr11 --lazy --ohh February 24, 2022 @ 17:06
52990 bytes zopfli --i100 --mls8 --bsr22 --lazy --ohh February 24, 2022 @ 15:47

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 @ 21:30.

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
52986 52986 52987 52987 52989 52988 52988 52988 52999 52988 52987 52990 52998 53012 53003
52987 52990 52984 52985 52997 52991 52983 52985 52991 52987 52992 52994 53003 53007 52996
53027 52989 52985 52987 52995 52988 52994 52984 52991 52997 52991 52994 52996 52999 52999
53019 53022 52985 52986 52988 52990 52984 52990 52992 52989 52988 52991 52989 53011 52992
52989 53022 52984 52986 52984 52987 52984 52987 52991 52999 52998 52987 52996 52997 52993
52986 53010 52985 52984 52985 52999 52975 52984 52990 53007 52995 52995 52993 53008 52996
52985 53013 52984 53023 52987 52993 52994 52994 52991 52995 53010 52986 52997 52995 52993
53021 53019 52984 52986 52986 52989 52984 52984 52991 53008 52995 52992 52999 53009 52995
52985 52987 52985 53018 52983 52993 52985 52987 52991 52995 52993 52996 52993 52996 52993
52986 53027 52984 52987 52989 52992 52975 52986 52993 52995 52993 52987 52997 52992 52994
52984 53012 52984 52989 52991 52986 52983 52989 52991 52985 53009 52993 52994 52996 52993
53016 53017 52984 52989 52985 52986 52985 52987 52991 52995 52988 52988 52993 53011 52994
52987 52984 52983 52984 52985 52995 52985 52985 52993 52995 52995 52994 52993 52996 52994
52987 52975 52987 52984 52985 52986 52986 52991 52992 53008 52996 52994 52997 52996 52994
52985 53011 52987 52986 52991 52987 52996 52990 52991 53000 53007 52995 52995 53002 52991
53018 53013 52984 52984 52986 52995 52985 52985 52991 52994 52996 52992 52991 53001 52997
52984 53022 52984 52984 52986 52987 52976 52991 52991 52996 52996 52994 52994 53006 52996
53018 53026 52986 52984 52989 52993 52984 52987 52992 53008 52996 52988 52995 52994 52996
53019 53011 52976 52984 52989 52984 52983 52986 52992 52995 53010 52995 52995 52994 52996
52985 53014 52985 52985 52988 52987 52985 52986 52990 53008 53000 52986 52992 52996 52993
52984 53011 52987 52986 52987 52988 52984 52991 52991 53005 52996 52987 52991 53015 52997
53018 53013 52987 52986 52985 52973 52983 52985 52992 53007 52994 52993 52994 52993 52992
52985 53013 52983 52988 52985 52980 52983 52986 52991 52994 53000 52986 52997 52993 52993

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 52990 bytes 100%
1,000 52987 bytes -3 bytes 100%
10,000 52982 bytes -5 bytes 100%
100,000 52974 bytes -8 bytes 2.03%
1,000,000 52973 bytes -1 byte 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
53135 bytes +162 bytes (+0.31%) +65 bytes
53070 bytes +97 bytes (+0.18%)
53070 bytes +97 bytes (+0.18%)
53128 bytes +155 bytes (+0.29%) +58 bytes
53139 bytes +166 bytes (+0.31%) +69 bytes
53173 bytes +200 bytes (+0.38%) +103 bytes
53218 bytes +245 bytes (+0.46%) +148 bytes
53254 bytes +281 bytes (+0.53%) +184 bytes
53274 bytes +301 bytes (+0.57%) +204 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 38931 bytes -14042 bytes (-26.51%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46468 bytes -6505 bytes (-12.28%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47441 bytes -5532 bytes (-10.44%)
Brotli (Wikipedia) brotli brotli -q 11 48911 bytes -4062 bytes (-7.67%)
LZMA2 (Wikipedia) xz xz -9 49984 bytes -2989 bytes (-5.64%)
Zstandard (Wikipedia) zstd zstd -19 51312 bytes -1661 bytes (-3.14%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51528 bytes -1445 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.