Choose a version:
26% The original file has 632026 bytes (617.2k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 165237 bytes (161.4k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  55704 bytes (54.4k)
 local copy
gzip -9
  55653 bytes (54.3k)
 local copy
libdeflate -12
  53005 bytes (51.8k)
 local copy
7zip -mx=9 -tgzip
  52956 bytes (51.7k)
 local copy
pigz -11 -n
  52911 bytes (51.7k)
 local copy
zultra
  52911 bytes (51.7k)
 local copy
kzip -s0 -rn -b1
  52909 bytes (51.7k)
 local copy
Zopfli
  52812 bytes (51.6k)
 local copy
Zopfli (defluff)
  52808 bytes (51.6k)
 local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.12.2.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.12.2 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 --bsr9 --lazy --ohh

(found March 17, 2022)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 128  --mls128
block splitting recursion 9  --bsr9
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 4 more bytes (52808 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-1.12.2/dojo.js --location | md5sum
9bcd2001acf43b3cebeeb262957be84f  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.2.min.zopfli.js.gz | md5sum
9bcd2001acf43b3cebeeb262957be84f  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.12.2/dojo.js --location | sha1sum
87520cc152425bfd133178aabc08fbb946dda099  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.2.min.zopfli.js.gz | sha1sum
87520cc152425bfd133178aabc08fbb946dda099  -

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
52812 bytes -1 byte zopfli --i1000000 --mls128 --bsr9 --lazy --ohh March 17, 2022 @ 17:22
52813 bytes -1 byte zopfli --i1000000 --mls32 --bsr4 --lazy --ohh January 29, 2020 @ 21:19
52814 bytes -6 bytes zopfli --i100000 --mls32 --bsr4 --lazy --ohh March 21, 2017 @ 13:15
52820 bytes -1 byte zopfli --i100000 --mls32 --bsr17 --lazy --ohh March 21, 2017 @ 12:14
52821 bytes -10 bytes zopfli --i10000 --mls32 --bsr9 --lazy --ohh March 11, 2017 @ 17:27
52831 bytes -1 byte zopfli --i1000 --mls64 --bsr30 --lazy --ohh March 11, 2017 @ 14:21
52832 bytes -2 bytes zopfli --i1000 --mls64 --bsr2 --lazy --ohh March 11, 2017 @ 14:10
52834 bytes – zopfli --i100 --mls64 --bsr2 --lazy --ohh March 11, 2017 @ 02:36

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

Most recent activity on March 18, 2022 @ 18:00.

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 52827 52827 52830 52830 52830 52827 52825 52838 52829 52832 52850 52833 52834 52853 52849
4 52861 52825 52826 52839 52813 52829 52833 52831 52834 52827 52831 52831 52832 52834 52838
6 52862 52823 52824 52827 52833 52838 52839 52833 52842 52835 52840 52832 52829 52831 52843
7 52828 52866 52863 52864 52822 52828 52830 52832 52832 52836 52840 52831 52831 52831 52837
8 52859 52825 52828 52828 52828 52827 52825 52828 52838 52834 52843 52840 52833 52833 52839
9 52826 52857 52827 52859 52820 52819 52812 52833 52844 52832 52829 52836 52830 52833 52839
10 52827 52860 52859 52817 52827 52835 52825 52828 52833 52838 52829 52832 52829 52829 52839
11 52825 52820 52825 52830 52822 52832 52828 52828 52833 52836 52831 52829 52829 52830 52849
12 52859 52827 52826 52859 52824 52832 52829 52828 52835 52838 52831 52836 52829 52837 52836
13 52831 52826 52826 52825 52822 52825 52817 52832 52831 52837 52833 52835 52830 52839 52837
14 52825 52827 52828 52825 52825 52825 52831 52830 52834 52834 52831 52835 52832 52840 52835
15 52826 52861 52828 52861 52826 52830 52823 52831 52832 52836 52834 52832 52834 52830 52834
16 52855 52827 52827 52828 52828 52827 52828 52829 52835 52829 52828 52835 52835 52834 52839
17 52856 52859 52827 52823 52820 52826 52826 52834 52834 52838 52835 52832 52832 52840 52841
18 52824 52860 52827 52861 52822 52826 52825 52833 52836 52835 52841 52832 52836 52829 52839
19 52825 52827 52828 52862 52822 52830 52828 52828 52833 52836 52832 52832 52836 52837 52839
20 52863 52858 52826 52822 52822 52828 52824 52832 52834 52837 52837 52831 52834 52839 52835
21 52858 52827 52825 52863 52822 52826 52823 52832 52835 52836 52834 52832 52835 52830 52839
22 52857 52827 52822 52860 52822 52828 52817 52831 52832 52836 52833 52831 52837 52830 52839
23 52824 52861 52827 52827 52825 52816 52826 52825 52834 52833 52832 52828 52829 52833 52835
25 52862 52826 52828 52830 52827 52825 52823 52834 52831 52838 52834 52835 52834 52830 52835
30 52859 52826 52828 52824 52820 52816 52829 52828 52832 52840 52834 52833 52833 52843 52837
40 52858 52828 52828 52830 52827 52821 52829 52828 52833 52835 52831 52833 52830 52837 52843

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 52834 bytes – 100%
1,000 52831 bytes -3 bytes 100%
10,000 52821 bytes -10 bytes 100%
100,000 52814 bytes -7 bytes 4.06%
1,000,000 52812 bytes -2 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) 52998 bytes +186 bytes (+0.35%) +89 bytes
1 52909 bytes +97 bytes (+0.18%) –
2 52916 bytes +104 bytes (+0.20%) +7 bytes
3 52957 bytes +145 bytes (+0.27%) +48 bytes
4 52994 bytes +182 bytes (+0.34%) +85 bytes
5 53035 bytes +223 bytes (+0.42%) +126 bytes
6 53050 bytes +238 bytes (+0.45%) +141 bytes
7 53101 bytes +289 bytes (+0.55%) +192 bytes
8 53113 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 38888 bytes -13924 bytes (-26.37%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46380 bytes -6432 bytes (-12.18%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47231 bytes -5581 bytes (-10.57%)
Brotli (Wikipedia) brotli brotli -q 11 48755 bytes -4057 bytes (-7.68%)
LZMA2 (Wikipedia) xz xz -9 49852 bytes -2960 bytes (-5.60%)
Zstandard (Wikipedia) zstd zstd -19 51349 bytes -1463 bytes (-2.77%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 51540 bytes -1272 bytes (-2.41%)

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.