Dojo 1.5.1 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 377390 bytes (368.5k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 90277 bytes (88.2k, 24%).

After GZIP compression these minified files vary in size:

Boot	35397 bytes (34.6k)	CDN
Baidu	30914 bytes (30.2k)	CDN
cdnjs	30906 bytes (30.2k)	CDN
gzip -6 (default)	30819 bytes (30.1k)	local copy
gzip -9	30792 bytes (30.1k)	local copy
Yandex	30772 bytes (30.1k)	CDN
Sina	30769 bytes (30.0k)	CDN
libdeflate -12	29421 bytes (28.7k)	local copy
7zip -mx=9 -tgzip	29404 bytes (28.7k)	local copy
kzip -s0 -rn -b3	29386 bytes (28.7k)	local copy
zultra	29358 bytes (28.7k)	local copy
pigz -11 -n	29350 bytes (28.7k)	local copy
Zopfli	29256 bytes (28.6k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.5.1.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.5.1 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

Save 1513 bytes by using my Dojo 1.5.1 Zopfli version instead of the best available CDN (5.17% smaller than Sina, 29256 vs. 30769 bytes):

Download

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 --mls16 --bsr22 --lazy --ohh

(found February 28, 2020)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	16	--mls16
block splitting recursion	22	--bsr22
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

Verify file integrity

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

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.5.1/dojo.js --location | md5sum
c9e1b24fb1ce730d6066686e0921a8c2 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.5.1.min.zopfli.js.gz | md5sum
c9e1b24fb1ce730d6066686e0921a8c2 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.5.1/dojo.js --location | sha1sum
64d08651b6f0f0d2663373c39f8024c98e86e57f -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.5.1.min.zopfli.js.gz | sha1sum
64d08651b6f0f0d2663373c39f8024c98e86e57f -

These CDNs send you the original file:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	35397 bytes	c9e1b24fb1ce730d6066686e0921a8c2	March 19, 2015 @ 15:32
cdnjs	30906 bytes	c9e1b24fb1ce730d6066686e0921a8c2	February 8, 2015 @ 14:45
Yandex	30772 bytes	c9e1b24fb1ce730d6066686e0921a8c2	June 20, 2013 @ 11:59
Sina	30769 bytes	c9e1b24fb1ce730d6066686e0921a8c2	April 25, 2019 @ 14:07

And some CDNs send you a different file:

CDN	Size (compressed)	MD5 (uncompressed)	Comment / Diff	Timestamp
Baidu	30914 bytes	5afb63c304d724239b304c1b16a77034	only whitespaces differ	January 7, 2015 @ 10:16

Note: only the MD5 hashes are shown to keep things simple.

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
29256 bytes	-1 byte	zopfli --i1000000 --mls16 --bsr22 --lazy --ohh	February 28, 2020 @ 00:46
29257 bytes	-3 bytes	zopfli --i100000 --mls16 --bsr22 --lazy --ohh	December 2, 2015 @ 09:01
29260 bytes	-4 bytes	zopfli --i10000 --mls16 --bsr22 --lazy --ohh	October 14, 2015 @ 09:21
29264 bytes	-4 bytes	zopfli --i1000 --mls16 --bsr22 --lazy --ohh	September 22, 2015 @ 03:07
29268 bytes	–	zopfli --i100 --mls16 --bsr22 --lazy --ohh	September 21, 2015 @ 10:58

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 @ 12:49.

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	29300	29304	29309	29314	29329	29299	29328	29348	29334	29346	29349	29356	29340	29339	29338
4	29321	29316	29317	29282	29313	29317	29339	29336	29321	29334	29339	29330	29285	29343	29338
6	29305	29302	29304	29316	29304	29315	29333	29339	29321	29345	29336	29334	29289	29340	29340
7	29326	29313	29307	29311	29302	29282	29336	29308	29325	29342	29339	29330	29340	29339	29338
8	29315	29292	29319	29312	29317	29315	29294	29338	29307	29314	29309	29332	29339	29340	29338
9	29320	29300	29316	29321	29310	29310	29304	29322	29306	29336	29339	29331	29296	29341	29341
10	29297	29293	29310	29313	29314	29324	29315	29332	29329	29329	29328	29331	29316	29341	29344
11	29315	29314	29315	29305	29315	29315	29309	29337	29316	29331	29330	29330	29320	29338	29335
12	29321	29280	29304	29307	29308	29309	29332	29313	29321	29327	29331	29339	29333	29332	29332
13	29312	29305	29325	29305	29301	29285	29304	29322	29310	29332	29327	29331	29292	29337	29335
14	29308	29306	29329	29296	29305	29314	29334	29335	29329	29327	29330	29328	29332	29340	29340
15	29305	29309	29309	29296	29311	29310	29303	29309	29329	29331	29338	29328	29333	29340	29339
16	29291	29283	29315	29297	29313	29320	29331	29336	29330	29330	29336	29332	29332	29337	29335
17	29301	29316	29325	29318	29316	29310	29308	29321	29304	29332	29334	29331	29303	29340	29339
18	29299	29317	29309	29298	29301	29310	29302	29321	29308	29330	29342	29330	29331	29341	29338
19	29306	29316	29324	29308	29300	29311	29333	29309	29309	29336	29337	29330	29333	29340	29337
20	29308	29314	29309	29298	29283	29324	29309	29319	29330	29341	29292	29331	29287	29332	29340
21	29317	29314	29311	29301	29311	29312	29306	29332	29308	29337	29333	29331	29332	29333	29339
22	29293	29315	29271	29256	29284	29318	29333	29336	29310	29330	29336	29337	29333	29335	29329
23	29312	29286	29324	29316	29304	29316	29297	29313	29308	29333	29334	29331	29305	29329	29331
25	29316	29309	29318	29305	29304	29316	29332	29337	29304	29328	29304	29328	29293	29337	29333
30	29303	29309	29319	29319	29307	29303	29331	29337	29302	29332	29329	29331	29331	29331	29329
40	29307	29307	29306	29307	29317	29309	29333	29320	29306	29334	29284	29331	29330	29340	29338

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	29268 bytes	–	100%
1,000	29264 bytes	-4 bytes	100%
10,000	29260 bytes	-4 bytes	100%
100,000	29257 bytes	-3 bytes	1.16%
1,000,000	29256 bytes	-1 byte	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
(any)	29394 bytes	+138 bytes (+0.47%)	+8 bytes
1	29388 bytes	+132 bytes (+0.45%)	+2 bytes
2	29426 bytes	+170 bytes (+0.58%)	+40 bytes
3	29386 bytes	+130 bytes (+0.44%)	–
4	29425 bytes	+169 bytes (+0.58%)	+39 bytes
5	29416 bytes	+160 bytes (+0.55%)	+30 bytes
6	29427 bytes	+171 bytes (+0.58%)	+41 bytes
7	29394 bytes	+138 bytes (+0.47%)	+8 bytes
8	29438 bytes	+182 bytes (+0.62%)	+52 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	23187 bytes	-6069 bytes (-20.74%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	26124 bytes	-3132 bytes (-10.71%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	26996 bytes	-2260 bytes (-7.72%)
Brotli (Wikipedia)	brotli	brotli -q 11	27148 bytes	-2108 bytes (-7.21%)
LZMA2 (Wikipedia)	xz	xz -9	28076 bytes	-1180 bytes (-4.03%)
Zstandard (Wikipedia)	zstd	zstd -19	28848 bytes	-408 bytes (-1.39%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	28929 bytes	-327 bytes (-1.12%)

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.