Dojo 1.8.8 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 610219 bytes (595.9k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 159225 bytes (155.5k, 26%).

After GZIP compression these minified files vary in size:

Boot	63163 bytes (61.7k)	CDN
cdnjs	54750 bytes (53.5k)	CDN
gzip -6 (default)	54489 bytes (53.2k)	local copy
gzip -9	54423 bytes (53.1k)	local copy
libdeflate -12	51866 bytes (50.7k)	local copy
7zip -mx=9 -tgzip	51855 bytes (50.6k)	local copy
kzip -s0 -rn -b1	51776 bytes (50.6k)	local copy
pigz -11 -n	51776 bytes (50.6k)	local copy
zultra	51775 bytes (50.6k)	local copy
Zopfli	51593 bytes (50.4k)	local copy
Zopfli (defluff)	51591 bytes (50.4k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.8.8.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.8.8 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 3157 bytes by using my Dojo 1.8.8 Zopfli version instead of the best available CDN (6.12% smaller than cdnjs, 51593 vs. 54750 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 --mls2 --bsr21 --lazy --ohh

(found January 31, 2020)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	2	--mls2
block splitting recursion	21	--bsr21
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 2 more bytes (51591 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-1.8.8/dojo.js --location | md5sum
3838cdfd35ec9b905ff7bf1e996bd19b -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.8.8.min.zopfli.js.gz | md5sum
3838cdfd35ec9b905ff7bf1e996bd19b -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.8.8/dojo.js --location | sha1sum
1b0f51b1da69713017d03ad2bf91a64136dcc815 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.8.8.min.zopfli.js.gz | sha1sum
1b0f51b1da69713017d03ad2bf91a64136dcc815 -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	63163 bytes	3838cdfd35ec9b905ff7bf1e996bd19b	March 19, 2015 @ 15:40
cdnjs	54750 bytes	3838cdfd35ec9b905ff7bf1e996bd19b	February 8, 2015 @ 14:45

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
51593 bytes	-5 bytes	zopfli --i1000000 --mls2 --bsr21 --lazy --ohh	January 31, 2020 @ 20:28
51598 bytes	-6 bytes	zopfli --i100000 --mls2 --bsr21 --lazy --ohh	December 3, 2015 @ 13:44
51604 bytes	-2 bytes	zopfli --i10000 --mls2 --bsr21 --lazy --ohh	October 14, 2015 @ 03:46
51606 bytes	-6 bytes	zopfli --i1000 --mls2 --bsr21 --lazy --ohh	September 22, 2015 @ 23:42
51612 bytes	–	zopfli --i100 --mls2 --bsr21 --lazy --ohh	September 22, 2015 @ 11:40

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 @ 12:51.

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	51683	51672	51681	51676	51680	51679	51676	51680	51680	51701	51688	51696	51704	51704	51685
4	51679	51630	51678	51680	51680	51677	51679	51679	51684	51670	51690	51690	51684	51682	51678
6	51622	51636	51631	51679	51677	51679	51682	51680	51679	51689	51681	51682	51682	51701	51681
7	51675	51709	51677	51678	51682	51679	51681	51680	51679	51678	51673	51683	51678	51676	51678
8	51615	51638	51698	51677	51678	51674	51673	51672	51681	51687	51692	51681	51682	51691	51679
9	51616	51629	51691	51678	51678	51679	51679	51674	51679	51693	51681	51689	51682	51684	51678
10	51621	51624	51679	51678	51679	51674	51680	51679	51679	51687	51685	51689	51699	51685	51679
11	51615	51631	51623	51677	51679	51674	51681	51675	51681	51687	51684	51682	51682	51684	51679
12	51617	51674	51677	51678	51678	51674	51674	51679	51695	51682	51681	51682	51682	51673	51681
13	51622	51633	51677	51678	51677	51678	51673	51678	51681	51683	51682	51682	51690	51681	51680
14	51615	51637	51677	51678	51678	51673	51674	51675	51681	51687	51684	51682	51689	51674	51678
15	51615	51629	51680	51675	51699	51679	51680	51684	51679	51698	51674	51690	51697	51677	51678
16	51622	51630	51678	51677	51677	51679	51680	51681	51696	51690	51687	51689	51703	51674	51681
17	51622	51634	51677	51678	51696	51678	51673	51678	51679	51684	51682	51685	51682	51672	51682
18	51618	51630	51680	51696	51679	51677	51682	51676	51682	51684	51688	51690	51698	51672	51682
19	51617	51627	51672	51674	51680	51681	51679	51674	51681	51685	51681	51682	51682	51676	51682
20	51616	51679	51672	51679	51680	51680	51673	51674	51679	51685	51687	51682	51698	51676	51678
21	51593	51632	51678	51679	51678	51674	51674	51674	51678	51685	51681	51683	51682	51702	51681
22	51605	51633	51676	51679	51679	51677	51682	51678	51682	51698	51691	51685	51682	51702	51679
23	51615	51680	51679	51677	51679	51674	51679	51681	51679	51690	51685	51683	51681	51680	51679
25	51616	51634	51680	51678	51678	51680	51681	51715	51678	51681	51674	51689	51686	51678	51681
30	51626	51624	51673	51677	51696	51673	51680	51679	51681	51676	51689	51682	51682	51681	51681
40	51616	51622	51676	51677	51678	51673	51673	51677	51679	51673	51673	51682	51682	51677	51678

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	51612 bytes	–	100%
1,000	51606 bytes	-6 bytes	100%
10,000	51604 bytes	-2 bytes	100%
100,000	51598 bytes	-6 bytes	0.58%
1,000,000	51593 bytes	-5 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
(any)	51838 bytes	+245 bytes (+0.47%)	+62 bytes
1	51776 bytes	+183 bytes (+0.35%)	–
2	51788 bytes	+195 bytes (+0.38%)	+12 bytes
3	51838 bytes	+245 bytes (+0.47%)	+62 bytes
4	51865 bytes	+272 bytes (+0.53%)	+89 bytes
5	51877 bytes	+284 bytes (+0.55%)	+101 bytes
6	51929 bytes	+336 bytes (+0.65%)	+153 bytes
7	51910 bytes	+317 bytes (+0.61%)	+134 bytes
8	51928 bytes	+335 bytes (+0.65%)	+152 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	37834 bytes	-13759 bytes (-26.67%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	44894 bytes	-6699 bytes (-12.98%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	46262 bytes	-5331 bytes (-10.33%)
Brotli (Wikipedia)	brotli	brotli -q 11	47328 bytes	-4265 bytes (-8.27%)
LZMA2 (Wikipedia)	xz	xz -9	48480 bytes	-3113 bytes (-6.03%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	49705 bytes	-1888 bytes (-3.66%)
Zstandard (Wikipedia)	zstd	zstd -19	49919 bytes	-1674 bytes (-3.24%)

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.