Choose a version:
26% The original file has 641607 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 168231 bytes (164.3k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  56492 bytes (55.2k)
 local copy
gzip -9
  56430 bytes (55.1k)
 local copy
libdeflate -12
  53750 bytes (52.5k)
 local copy
7zip -mx=9 -tgzip
  53723 bytes (52.5k)
 local copy
zultra
  53659 bytes (52.4k)
 local copy
kzip -s0 -rn -b1
  53648 bytes (52.4k)
 local copy
pigz -11 -n
  53636 bytes (52.4k)
 local copy
Zopfli
  53554 bytes (52.3k)
 local copy
Zopfli (defluff)
  53551 bytes (52.3k)
 local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.16.0.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.16.0 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 --mls128 --bsr17 --lazy --ohh

(found December 1, 2019)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 128  --mls128
block splitting recursion 17  --bsr17
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 3 more bytes (53551 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-1.16.0/dojo.js --location | md5sum
d44ca65adbf0f6b35de00438b1718626  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.16.0.min.zopfli.js.gz | md5sum
d44ca65adbf0f6b35de00438b1718626  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.16.0/dojo.js --location | sha1sum
59a5f361cbc66939436e03a06c199eff1ec9d23d  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.16.0.min.zopfli.js.gz | sha1sum
59a5f361cbc66939436e03a06c199eff1ec9d23d  -

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
53554 bytes -5 bytes zopfli --i100000 --mls128 --bsr17 --lazy --ohh December 1, 2019 @ 06:16
53559 bytes -4 bytes zopfli --i10000 --mls128 --bsr17 --lazy --ohh November 30, 2019 @ 02:55
53563 bytes -2 bytes zopfli --i10000 --mls128 --bsr16 --lazy --ohh November 30, 2019 @ 02:27
53565 bytes -3 bytes zopfli --i10000 --mls2 --bsr10 --lazy --ohh November 30, 2019 @ 00:54
53568 bytes -1 byte zopfli --i1000 --mls32 --bsr21 --lazy --ohh November 29, 2019 @ 22:29
53569 bytes -1 byte zopfli --i1000 --mls64 --bsr2 --lazy --ohh November 29, 2019 @ 22:12
53570 bytes -3 bytes zopfli --i1000 --mls128 --bsr9 --lazy --ohh November 29, 2019 @ 20:20
53573 bytes – zopfli --i100 --mls4 --bsr6 --lazy --ohh November 29, 2019 @ 19:27

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

Most recent activity on February 24, 2022 @ 17:05.

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 53605 53584 53565 53566 53562 53564 53562 53561 53583 53580 53583 53567 53568 53599 53582
4 53606 53605 53607 53566 53568 53576 53566 53563 53573 53573 53570 53567 53565 53587 53568
6 53605 53565 53597 53565 53574 53573 53574 53574 53574 53579 53577 53582 53576 53575 53575
7 53595 53607 53600 53593 53586 53576 53570 53567 53572 53573 53572 53567 53571 53570 53572
8 53610 53597 53601 53567 53567 53580 53561 53563 53580 53573 53581 53578 53576 53577 53575
9 53602 53613 53569 53565 53566 53568 53564 53562 53573 53572 53589 53580 53578 53583 53570
10 53565 53594 53600 53604 53567 53583 53563 53565 53572 53573 53576 53563 53578 53584 53579
11 53600 53579 53569 53595 53566 53564 53554 53563 53573 53572 53578 53575 53578 53590 53571
12 53601 53603 53600 53604 53563 53564 53554 53565 53572 53573 53577 53574 53573 53572 53581
13 53594 53601 53594 53565 53566 53573 53554 53565 53574 53572 53579 53576 53574 53583 53571
14 53566 53580 53569 53601 53562 53563 53570 53564 53573 53573 53576 53587 53573 53579 53582
15 53594 53601 53567 53594 53565 53576 53563 53573 53571 53573 53577 53569 53578 53579 53573
16 53594 53600 53593 53566 53568 53579 53563 53574 53573 53572 53575 53576 53574 53572 53571
17 53591 53599 53601 53602 53565 53572 53554 53573 53573 53572 53586 53587 53573 53579 53582
18 53597 53568 53598 53594 53565 53566 53561 53563 53574 53576 53576 53582 53578 53587 53585
19 53564 53596 53567 53565 53565 53581 53562 53562 53573 53573 53584 53587 53578 53583 53579
20 53597 53566 53597 53565 53563 53568 53562 53573 53583 53573 53573 53566 53573 53587 53571
21 53590 53603 53601 53600 53563 53567 53554 53566 53573 53573 53577 53575 53578 53583 53577
22 53579 53600 53570 53565 53563 53582 53554 53573 53572 53573 53574 53566 53572 53583 53581
23 53564 53593 53563 53565 53564 53573 53561 53573 53573 53572 53574 53580 53573 53581 53581
25 53608 53597 53597 53601 53563 53577 53573 53565 53573 53574 53573 53576 53573 53583 53581
30 53593 53598 53594 53603 53568 53570 53555 53573 53573 53572 53583 53579 53582 53583 53582
40 53593 53597 53593 53565 53565 53580 53561 53574 53574 53572 53573 53583 53577 53585 53579

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 53573 bytes – 100%
1,000 53568 bytes -5 bytes 100%
10,000 53559 bytes -9 bytes 100%
100,000 53554 bytes -5 bytes 2.03%
1,000,000 53554 bytes – 1.74%
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) 53733 bytes +179 bytes (+0.33%) +85 bytes
1 53648 bytes +94 bytes (+0.18%) –
2 53680 bytes +126 bytes (+0.24%) +32 bytes
3 53707 bytes +153 bytes (+0.29%) +59 bytes
4 53732 bytes +178 bytes (+0.33%) +84 bytes
5 53738 bytes +184 bytes (+0.34%) +90 bytes
6 53726 bytes +172 bytes (+0.32%) +78 bytes
7 53768 bytes +214 bytes (+0.40%) +120 bytes
8 53797 bytes +243 bytes (+0.45%) +149 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 - but your browser doesn't support it.
Algorithm Program Parameters Size Compared To Best Zopfli
ZPAQ (Wikipedia) zpaq zpaq -method 69 39404 bytes -14150 bytes (-26.42%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 47011 bytes -6543 bytes (-12.22%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47919 bytes -5635 bytes (-10.52%)
Brotli (Wikipedia) brotli brotli -q 11 49418 bytes -4136 bytes (-7.72%)
LZMA2 (Wikipedia) xz xz -9 50500 bytes -3054 bytes (-5.70%)
Zstandard (Wikipedia) zstd zstd -19 51871 bytes -1683 bytes (-3.14%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 52256 bytes -1298 bytes (-2.42%)

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 2024.
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.