Dojo 1.14.0 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 637943 bytes (623.0k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 167103 bytes (163.2k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	56217 bytes (54.9k)	local copy
gzip -9	56148 bytes (54.8k)	local copy
libdeflate -12	53495 bytes (52.2k)	local copy
7zip -mx=9 -tgzip	53462 bytes (52.2k)	local copy
zultra	53387 bytes (52.1k)	local copy
kzip -s0 -rn -b1	53378 bytes (52.1k)	local copy
pigz -11 -n	53363 bytes (52.1k)	local copy
Zopfli	53283 bytes (52.0k)	local copy
Zopfli (defluff)	53280 bytes (52.0k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.14.0.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.14.0 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 --i1000000 --mb8 --mls128 --bsr25 --lazy --ohh

(found August 13, 2018)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	128	--mls128
block splitting recursion	25	--bsr25
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 (53280 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-1.14.0/dojo.js --location | md5sum
47ad49c27d961596ed66b50a7372238e -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.14.0.min.zopfli.js.gz | md5sum
47ad49c27d961596ed66b50a7372238e -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.14.0/dojo.js --location | sha1sum
bab41cc055bd7e5271e39b60ea7a3c92cecd2664 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.14.0.min.zopfli.js.gz | sha1sum
bab41cc055bd7e5271e39b60ea7a3c92cecd2664 -

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
53283 bytes	-1 byte	zopfli --i1000000 --mls128 --bsr25 --lazy --ohh	August 13, 2018 @ 22:50
53284 bytes	-7 bytes	zopfli --i100000 --mls128 --bsr25 --lazy --ohh	August 13, 2018 @ 12:44
53291 bytes	-1 byte	zopfli --i10000 --mls128 --bsr15 --lazy --ohh	August 13, 2018 @ 11:45
53292 bytes	-2 bytes	zopfli --i10000 --mls16 --bsr10 --lazy --ohh	August 13, 2018 @ 11:26
53294 bytes	-3 bytes	zopfli --i10000 --mls256 --bsr6 --lazy --ohh	August 13, 2018 @ 11:20
53297 bytes	-2 bytes	zopfli --i1000 --mls256 --bsr6 --lazy --ohh	August 13, 2018 @ 11:12
53299 bytes	-1 byte	zopfli --i1000 --mls256 --bsr17 --lazy --ohh	August 13, 2018 @ 11:11
53300 bytes	–	zopfli --i100 --mls256 --bsr6 --lazy --ohh	August 13, 2018 @ 11:08

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

Most recent activity on March 6, 2022 @ 22:27.

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	53294	53294	53295	53298	53297	53295	53299	53294	53314	53297	53297	53297	53308	53324	53321
4	53329	53305	53297	53297	53297	53307	53295	53293	53304	53297	53316	53299	53307	53315	53303
6	53333	53338	53292	53295	53294	53308	53308	53294	53303	53302	53309	53313	53307	53309	53308
7	53336	53334	53298	53334	53308	53305	53300	53295	53297	53302	53310	53294	53299	53313	53306
8	53328	53325	53292	53333	53295	53307	53283	53294	53302	53301	53313	53301	53307	53313	53311
9	53326	53333	53296	53293	53293	53305	53294	53296	53304	53301	53315	53305	53307	53317	53311
10	53324	53304	53296	53292	53307	53307	53295	53293	53301	53304	53307	53294	53295	53314	53317
11	53330	53336	53330	53294	53295	53308	53294	53295	53295	53301	53304	53294	53308	53314	53302
12	53329	53338	53297	53334	53294	53311	53283	53294	53304	53301	53308	53306	53307	53306	53307
13	53324	53336	53292	53295	53297	53308	53283	53294	53304	53301	53309	53293	53294	53317	53310
14	53294	53295	53340	53294	53296	53307	53287	53294	53302	53302	53304	53299	53308	53319	53301
15	53328	53331	53294	53295	53310	53306	53283	53294	53302	53302	53308	53294	53293	53307	53316
16	53330	53326	53285	53333	53296	53293	53283	53292	53302	53313	53306	53297	53308	53306	53313
17	53335	53326	53296	53331	53297	53294	53292	53293	53305	53301	53307	53298	53308	53307	53313
18	53338	53334	53293	53294	53294	53292	53283	53302	53302	53301	53307	53294	53308	53315	53313
19	53293	53325	53296	53329	53297	53307	53283	53292	53302	53302	53307	53311	53308	53313	53316
20	53327	53335	53296	53293	53295	53306	53283	53302	53304	53302	53304	53297	53309	53315	53319
21	53328	53328	53293	53294	53292	53305	53283	53292	53304	53302	53307	53294	53308	53306	53315
22	53325	53334	53296	53294	53295	53311	53283	53294	53304	53301	53304	53306	53308	53307	53301
23	53294	53294	53334	53293	53294	53307	53283	53293	53302	53301	53306	53294	53309	53308	53312
25	53327	53331	53294	53334	53294	53306	53283	53302	53305	53302	53308	53294	53309	53314	53312
30	53326	53333	53293	53329	53297	53292	53292	53295	53302	53301	53307	53301	53307	53316	53311
40	53328	53329	53297	53328	53296	53308	53283	53287	53304	53301	53303	53299	53307	53307	53312

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	53300 bytes	–	100%
1,000	53297 bytes	-3 bytes	100%
10,000	53291 bytes	-6 bytes	100%
100,000	53284 bytes	-7 bytes	4.64%
1,000,000	53283 bytes	-1 byte	3.77%
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)	53459 bytes	+176 bytes (+0.33%)	+81 bytes
1	53378 bytes	+95 bytes (+0.18%)	–
2	53411 bytes	+128 bytes (+0.24%)	+33 bytes
3	53427 bytes	+144 bytes (+0.27%)	+49 bytes
4	53459 bytes	+176 bytes (+0.33%)	+81 bytes
5	53462 bytes	+179 bytes (+0.34%)	+84 bytes
6	53468 bytes	+185 bytes (+0.35%)	+90 bytes
7	53504 bytes	+221 bytes (+0.41%)	+126 bytes
8	53539 bytes	+256 bytes (+0.48%)	+161 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	39116 bytes	-14167 bytes (-26.59%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46758 bytes	-6525 bytes (-12.25%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47712 bytes	-5571 bytes (-10.46%)
Brotli (Wikipedia)	brotli	brotli -q 11	49271 bytes	-4012 bytes (-7.53%)
LZMA2 (Wikipedia)	xz	xz -9	50260 bytes	-3023 bytes (-5.67%)
Zstandard (Wikipedia)	zstd	zstd -19	51716 bytes	-1567 bytes (-2.94%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	51923 bytes	-1360 bytes (-2.55%)

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.