Choose a version:
26% The original file has 638954 bytes (624.0k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 167728 bytes (163.8k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  56337 bytes (55.0k)
local copy
gzip -9
  56270 bytes (55.0k)
local copy
libdeflate -12
  53587 bytes (52.3k)
local copy
7zip -mx=9 -tgzip
  53575 bytes (52.3k)
local copy
zultra
  53496 bytes (52.2k)
local copy
kzip -s0 -rn -b1
  53493 bytes (52.2k)
local copy
pigz -11 -n
  53489 bytes (52.2k)
local copy
Zopfli
  53405 bytes (52.2k)
local copy
Zopfli (defluff)
  53402 bytes (52.2k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.14.6.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.14.6 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 --bsr18 --lazy --ohh

(found March 18, 2020)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 128  --mls128
block splitting recursion 18  --bsr18
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 (53402 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.14.6/dojo.js --location | md5sum
854ed8d30f93157638e2107e22d11782  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.14.6.min.zopfli.js.gz | md5sum
854ed8d30f93157638e2107e22d11782  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.14.6/dojo.js --location | sha1sum
928e14dc3e8f995837a80b018a700b39b06858d4  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.14.6.min.zopfli.js.gz | sha1sum
928e14dc3e8f995837a80b018a700b39b06858d4  -

Other Versions

Available Dojo versions at minime.stephan-brumme.com:

1.16.3, 1.16.2, 1.16.1, 1.16.0,
1.15.4, 1.15.3, 1.15.2, 1.15.1, 1.15.0,
1.14.7, 1.14.6, 1.14.5, 1.14.4, 1.14.3, 1.14.2, 1.14.1, 1.14.0,
1.13.5, 1.13.4, 1.13.3, 1.13.2, 1.13.1, 1.13.0,
1.12.5, 1.12.4, 1.12.3, 1.12.2, 1.12.1,
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
53405 bytes -3 bytes zopfli --i1000000 --mls128 --bsr18 --lazy --ohh March 18, 2020 @ 19:44
53408 bytes -2 bytes zopfli --i100000 --mls128 --bsr18 --lazy --ohh March 18, 2020 @ 09:01
53410 bytes -1 byte zopfli --i10000 --mls128 --bsr12 --lazy --ohh March 17, 2020 @ 13:52
53411 bytes -4 bytes zopfli --i10000 --mls2 --bsr30 --lazy --ohh March 17, 2020 @ 12:32
53415 bytes -5 bytes zopfli --i10000 --mls128 --bsr19 --lazy --ohh March 17, 2020 @ 12:16
53420 bytes -1 byte zopfli --i1000 --mls128 --bsr14 --lazy --ohh March 17, 2020 @ 10:50
53421 bytes -2 bytes zopfli --i1000 --mls128 --bsr13 --lazy --ohh March 17, 2020 @ 10:31
53423 bytes -1 byte zopfli --i1000 --mls4 --bsr20 --lazy --ohh March 17, 2020 @ 10:30
53424 bytes zopfli --i100 --mls2 --bsr16 --lazy --ohh March 17, 2020 @ 10:07

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

Most recent activity on July 20, 2020 @ 12:54.

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
53413 53414 53419 53421 53422 53420 53413 53418 53434 53437 53418 53416 53416 53450 53435
53413 53413 53418 53414 53429 53429 53414 53413 53425 53419 53433 53420 53416 53426 53419
53440 53420 53414 53455 53414 53426 53411 53424 53426 53425 53429 53433 53423 53432 53427
53453 53413 53417 53451 53427 53427 53413 53415 53421 53422 53427 53420 53414 53432 53426
53412 53448 53419 53450 53412 53426 53414 53412 53425 53434 53433 53421 53415 53429 53426
53441 53452 53417 53451 53414 53415 53419 53417 53425 53424 53429 53414 53411 53459 53426
53412 53442 53414 53429 53425 53408 53424 53412 53424 53426 53430 53427 53413 53439 53426
53412 53445 53419 53441 53415 53408 53417 53414 53425 53423 53427 53413 53424 53439 53427
53413 53451 53415 53452 53414 53411 53408 53414 53425 53425 53430 53420 53426 53428 53427
53439 53442 53412 53413 53426 53419 53408 53412 53425 53424 53427 53413 53414 53432 53426
53412 53414 53447 53413 53417 53420 53408 53413 53425 53425 53427 53422 53418 53429 53423
53443 53414 53417 53413 53430 53421 53414 53419 53425 53423 53432 53430 53412 53432 53431
53411 53412 53412 53451 53416 53411 53408 53415 53421 53431 53426 53428 53425 53431 53428
53441 53416 53418 53447 53412 53422 53408 53426 53426 53425 53425 53413 53420 53433 53426
53442 53416 53412 53413 53417 53414 53405 53424 53425 53423 53429 53422 53426 53435 53433
53413 53416 53412 53446 53412 53424 53415 53411 53425 53425 53430 53433 53413 53433 53425
53413 53414 53412 53446 53413 53434 53415 53425 53425 53425 53432 53425 53412 53427 53427
53445 53414 53412 53449 53420 53421 53415 53411 53425 53425 53422 53413 53421 53431 53425
53442 53445 53416 53423 53415 53421 53408 53412 53422 53423 53427 53427 53422 53435 53425
53413 53413 53445 53442 53417 53422 53413 53425 53425 53425 53429 53414 53415 53431 53428
53411 53440 53414 53442 53417 53416 53411 53423 53425 53425 53431 53422 53427 53431 53427
53411 53413 53413 53444 53412 53429 53414 53413 53426 53424 53430 53413 53421 53439 53424
53411 53443 53416 53412 53418 53425 53413 53409 53425 53424 53426 53421 53420 53432 53427

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 53424 bytes 100%
1,000 53420 bytes -4 bytes 100%
10,000 53410 bytes -10 bytes 100%
100,000 53408 bytes -2 bytes 2.90%
1,000,000 53405 bytes -3 bytes 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
53568 bytes +163 bytes (+0.31%) +75 bytes
53493 bytes +88 bytes (+0.16%)
53524 bytes +119 bytes (+0.22%) +31 bytes
53550 bytes +145 bytes (+0.27%) +57 bytes
53570 bytes +165 bytes (+0.31%) +77 bytes
53570 bytes +165 bytes (+0.31%) +77 bytes
53568 bytes +163 bytes (+0.31%) +75 bytes
53613 bytes +208 bytes (+0.39%) +120 bytes
53635 bytes +230 bytes (+0.43%) +142 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 39299 bytes -14106 bytes (-26.41%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46896 bytes -6509 bytes (-12.19%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47833 bytes -5572 bytes (-10.43%)
Brotli (Wikipedia) brotli brotli -q 11 49285 bytes -4120 bytes (-7.71%)
LZMA2 (Wikipedia) xz xz -9 50404 bytes -3001 bytes (-5.62%)
Zstandard (Wikipedia) zstd zstd -19 51737 bytes -1668 bytes (-3.12%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 52069 bytes -1336 bytes (-2.50%)

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 2020.
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.