Choose a version:
26% The original file has 641631 bytes (626.6k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 168251 bytes (164.3k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  56503 bytes (55.2k)
 local copy
gzip -9
  56439 bytes (55.1k)
 local copy
libdeflate -12
  53761 bytes (52.5k)
 local copy
7zip -mx=9 -tgzip
  53731 bytes (52.5k)
 local copy
zultra
  53668 bytes (52.4k)
 local copy
kzip -s0 -rn -b1
  53657 bytes (52.4k)
 local copy
pigz -11 -n
  53648 bytes (52.4k)
 local copy
Zopfli
  53563 bytes (52.3k)
 local copy
Zopfli (defluff)
  53561 bytes (52.3k)
 local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.16.2.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.16.2 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 --bsr13 --lazy --ohh

(found March 18, 2020)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 128  --mls128
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 (53561 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-1.16.2/dojo.js --location | md5sum
4c1f3b07c1edd8d5ac57c3a77eea0cd6  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.16.2.min.zopfli.js.gz | md5sum
4c1f3b07c1edd8d5ac57c3a77eea0cd6  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.16.2/dojo.js --location | sha1sum
a77d4f353fcb676d8d9cd43c072b9262ca969a93  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.16.2.min.zopfli.js.gz | sha1sum
a77d4f353fcb676d8d9cd43c072b9262ca969a93  -

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
53563 bytes -1 byte zopfli --i1000000 --mls128 --bsr13 --lazy --ohh March 18, 2020 @ 18:26
53564 bytes -1 byte zopfli --i100000 --mls128 --bsr13 --lazy --ohh March 18, 2020 @ 09:08
53565 bytes -5 bytes zopfli --i100000 --mls128 --bsr30 --lazy --ohh March 18, 2020 @ 09:03
53570 bytes -7 bytes zopfli --i10000 --mls128 --bsr30 --lazy --ohh March 17, 2020 @ 12:45
53577 bytes -1 byte zopfli --i10000 --mls32 --bsr30 --lazy --ohh March 17, 2020 @ 12:44
53578 bytes -2 bytes zopfli --i1000 --mls64 --bsr2 --lazy --ohh March 17, 2020 @ 10:41
53580 bytes -2 bytes zopfli --i1000 --mls32 --bsr25 --lazy --ohh March 17, 2020 @ 10:30
53582 bytes – zopfli --i100 --mls256 --bsr10 --lazy --ohh March 17, 2020 @ 10:15

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

Most recent activity on March 5, 2022 @ 22:19.

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 53614 53611 53574 53575 53575 53574 53572 53569 53594 53576 53577 53576 53577 53608 53592
4 53604 53615 53607 53589 53578 53588 53574 53573 53582 53582 53580 53577 53580 53597 53578
6 53576 53575 53603 53575 53583 53583 53583 53583 53583 53588 53589 53584 53587 53584 53587
7 53609 53608 53584 53604 53578 53585 53575 53577 53583 53577 53585 53583 53583 53577 53589
8 53617 53604 53613 53576 53577 53588 53564 53573 53587 53585 53591 53587 53589 53587 53585
9 53606 53620 53579 53572 53576 53577 53572 53573 53582 53582 53587 53587 53582 53593 53583
10 53575 53604 53604 53613 53576 53591 53573 53575 53582 53582 53588 53573 53582 53580 53590
11 53603 53573 53577 53586 53572 53574 53563 53573 53583 53581 53590 53598 53583 53600 53581
12 53600 53610 53612 53580 53575 53572 53563 53575 53582 53582 53586 53584 53583 53583 53591
13 53601 53604 53607 53575 53575 53583 53563 53575 53578 53595 53591 53585 53589 53585 53582
14 53574 53593 53612 53614 53572 53574 53580 53573 53583 53583 53586 53598 53582 53591 53589
15 53604 53609 53573 53605 53575 53587 53572 53583 53582 53582 53589 53585 53587 53592 53590
16 53604 53607 53610 53576 53578 53586 53573 53582 53582 53581 53586 53577 53583 53583 53582
17 53605 53602 53603 53614 53578 53583 53563 53582 53583 53596 53597 53593 53581 53584 53590
18 53606 53606 53617 53604 53575 53576 53564 53573 53583 53582 53588 53592 53590 53593 53594
19 53574 53602 53574 53575 53575 53583 53573 53573 53583 53582 53593 53590 53619 53593 53590
20 53607 53576 53574 53575 53576 53577 53573 53581 53578 53582 53585 53590 53583 53596 53593
21 53600 53609 53574 53612 53575 53576 53563 53576 53582 53582 53589 53585 53588 53593 53589
22 53589 53613 53580 53609 53573 53584 53563 53583 53582 53584 53584 53576 53582 53592 53589
23 53574 53599 53577 53612 53574 53583 53563 53583 53582 53581 53586 53598 53583 53590 53591
25 53602 53602 53601 53611 53572 53588 53584 53575 53583 53583 53584 53587 53583 53593 53591
30 53602 53608 53603 53612 53577 53579 53565 53582 53583 53582 53593 53588 53592 53590 53591
40 53603 53607 53606 53620 53575 53584 53565 53584 53582 53581 53584 53592 53581 53594 53589

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 53582 bytes – 100%
1,000 53578 bytes -4 bytes 100%
10,000 53570 bytes -8 bytes 100%
100,000 53564 bytes -6 bytes 3.48%
1,000,000 53563 bytes -1 byte 2.61%
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) 53743 bytes +180 bytes (+0.34%) +86 bytes
1 53657 bytes +94 bytes (+0.18%) –
2 53688 bytes +125 bytes (+0.23%) +31 bytes
3 53710 bytes +147 bytes (+0.27%) +53 bytes
4 53721 bytes +158 bytes (+0.29%) +64 bytes
5 53751 bytes +188 bytes (+0.35%) +94 bytes
6 53738 bytes +175 bytes (+0.33%) +81 bytes
7 53782 bytes +219 bytes (+0.41%) +125 bytes
8 53796 bytes +233 bytes (+0.44%) +139 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 39418 bytes -14145 bytes (-26.41%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 47019 bytes -6544 bytes (-12.22%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47931 bytes -5632 bytes (-10.51%)
Brotli (Wikipedia) brotli brotli -q 11 49433 bytes -4130 bytes (-7.71%)
LZMA2 (Wikipedia) xz xz -9 50512 bytes -3051 bytes (-5.70%)
Zstandard (Wikipedia) zstd zstd -19 51878 bytes -1685 bytes (-3.15%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 52151 bytes -1412 bytes (-2.64%)

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.