Choose a version:
26% The original file has 638930 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 167708 bytes (163.8k, 26%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  56330 bytes (55.0k)
local copy
gzip -9
  56263 bytes (54.9k)
local copy
libdeflate -12
  53578 bytes (52.3k)
local copy
7zip -mx=9 -tgzip
  53565 bytes (52.3k)
local copy
kzip -s0 -rn -b1
  53488 bytes (52.2k)
local copy
pigz -11 -n
  53471 bytes (52.2k)
local copy
Zopfli
  53397 bytes (52.1k)
local copy
Zopfli (defluff)
  53393 bytes (52.1k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.14.5.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.14.5 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 --mls256 --bsr40 --lazy --ohh

(found February 19, 2020)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 256  --mls256
block splitting recursion 40  --bsr40
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 (53393 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.14.5/dojo.js --location | md5sum
79d628738328076ca5fb0e312e4ad7d4  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.14.5.min.zopfli.js.gz | md5sum
79d628738328076ca5fb0e312e4ad7d4  -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.14.5/dojo.js --location | sha1sum
5bc28384a5ef5b5da46352e4fbef8c7f82ee4eff  -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.14.5.min.zopfli.js.gz | sha1sum
5bc28384a5ef5b5da46352e4fbef8c7f82ee4eff  -

Other Versions

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

1.16.2, 1.16.1, 1.16.0,
1.15.3, 1.15.2, 1.15.1, 1.15.0,
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
53397 bytes -7 bytes zopfli --i100000 --mls256 --bsr40 --lazy --ohh February 19, 2020 @ 18:17
53404 bytes -7 bytes zopfli --i10000 --mls256 --bsr40 --lazy --ohh February 19, 2020 @ 17:07
53411 bytes -1 byte zopfli --i1000 --mls256 --bsr40 --lazy --ohh February 19, 2020 @ 14:34
53412 bytes -1 byte zopfli --i1000 --mls64 --bsr10 --lazy --ohh February 19, 2020 @ 14:20
53413 bytes -2 bytes zopfli --i1000 --mls2 --bsr23 --lazy --ohh February 19, 2020 @ 14:06
53415 bytes zopfli --i100 --mls8192 --bsr9 --lazy --ohh February 19, 2020 @ 13:22

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

Most recent activity on February 24, 2020 @ 09:18.

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
53403 53404 53410 53406 53412 53403 53409 53407 53422 53423 53408 53411 53407 53442 53417
53403 53403 53413 53405 53419 53420 53404 53407 53415 53410 53425 53412 53404 53417 53409
53433 53410 53404 53409 53409 53413 53400 53401 53416 53415 53419 53424 53411 53422 53417
53443 53404 53407 53442 53419 53418 53406 53415 53409 53409 53417 53410 53408 53423 53413
53400 53434 53427 53441 53407 53415 53404 53406 53415 53420 53425 53413 53405 53421 53415
53434 53431 53412 53404 53409 53411 53411 53408 53414 53415 53419 53408 53407 53437 53416
53407 53432 53410 53445 53416 53406 53410 53406 53411 53416 53420 53401 53408 53422 53417
53407 53430 53408 53404 53409 53406 53407 53408 53415 53413 53417 53408 53412 53429 53410
53408 53409 53405 53441 53408 53407 53404 53406 53414 53415 53420 53412 53415 53419 53418
53439 53433 53408 53404 53417 53415 53404 53401 53414 53415 53421 53404 53404 53423 53417
53408 53404 53438 53404 53410 53422 53406 53409 53415 53415 53416 53413 53413 53420 53414
53430 53404 53406 53404 53420 53413 53405 53408 53415 53413 53422 53415 53408 53423 53415
53436 53407 53403 53410 53410 53415 53404 53409 53411 53414 53417 53413 53408 53421 53419
53399 53407 53408 53438 53408 53412 53404 53415 53415 53415 53420 53413 53413 53423 53419
53431 53406 53408 53404 53404 53404 53404 53415 53415 53413 53419 53412 53413 53424 53422
53408 53412 53408 53440 53408 53417 53406 53405 53415 53415 53420 53410 53408 53423 53419
53435 53404 53408 53404 53409 53419 53406 53415 53414 53415 53423 53415 53408 53417 53418
53430 53404 53403 53404 53407 53414 53404 53406 53414 53415 53417 53404 53413 53422 53414
53427 53431 53411 53404 53410 53416 53404 53401 53411 53413 53417 53411 53412 53421 53417
53403 53404 53435 53408 53403 53415 53408 53414 53415 53414 53419 53409 53411 53423 53412
53437 53430 53409 53439 53407 53411 53407 53415 53415 53414 53417 53409 53415 53422 53420
53433 53403 53408 53436 53408 53419 53405 53404 53415 53413 53420 53403 53424 53422 53417
53434 53429 53411 53403 53404 53415 53404 53397 53414 53415 53416 53411 53412 53423 53418

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 53415 bytes 100%
1,000 53411 bytes -4 bytes 100%
10,000 53402 bytes -9 bytes 100%
100,000 53397 bytes -5 bytes 2.32%
1,000,000 53397 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
53567 bytes +170 bytes (+0.32%) +79 bytes
53488 bytes +91 bytes (+0.17%)
53515 bytes +118 bytes (+0.22%) +27 bytes
53545 bytes +148 bytes (+0.28%) +57 bytes
53562 bytes +165 bytes (+0.31%) +74 bytes
53568 bytes +171 bytes (+0.32%) +80 bytes
53559 bytes +162 bytes (+0.30%) +71 bytes
53600 bytes +203 bytes (+0.38%) +112 bytes
53630 bytes +233 bytes (+0.44%) +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 39291 bytes -14106 bytes (-26.42%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 46880 bytes -6517 bytes (-12.20%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 47821 bytes -5576 bytes (-10.44%)
Brotli (Wikipedia) brotli brotli -q 11 49311 bytes -4086 bytes (-7.65%)
LZMA2 (Wikipedia) xz xz -9 50396 bytes -3001 bytes (-5.62%)
Zstandard (Wikipedia) zstd zstd -19 51730 bytes -1667 bytes (-3.12%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 52051 bytes -1346 bytes (-2.52%)

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.