Dojo 1.8.10 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 610208 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 159226 bytes (155.5k, 26%).

After GZIP compression these minified files vary in size:

Boot	63168 bytes (61.7k)	CDN
cdnjs	54753 bytes (53.5k)	CDN
gzip -6 (default)	54495 bytes (53.2k)	local copy
gzip -9	54428 bytes (53.2k)	local copy
libdeflate -12	51868 bytes (50.7k)	local copy
7zip -mx=9 -tgzip	51857 bytes (50.6k)	local copy
kzip -s0 -rn -b1	51777 bytes (50.6k)	local copy
zultra	51777 bytes (50.6k)	local copy
pigz -11 -n	51769 bytes (50.6k)	local copy
Zopfli	51596 bytes (50.4k)	local copy
Zopfli (defluff)	51594 bytes (50.4k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.8.10.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.8.10 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 1.8.10 Zopfli version instead of the best available CDN (6.12% smaller than cdnjs, 51596 vs. 54753 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 --mls8 --bsr19 --lazy --ohh

(found January 31, 2020)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	8	--mls8
block splitting recursion	19	--bsr19
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 (51594 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-1.8.10/dojo.js --location | md5sum
686572db787d2b0939aa556d3e79db38 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.8.10.min.zopfli.js.gz | md5sum
686572db787d2b0939aa556d3e79db38 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.8.10/dojo.js --location | sha1sum
5166b72ede6486d8fa9f98c0619deffabd56acd9 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.8.10.min.zopfli.js.gz | sha1sum
5166b72ede6486d8fa9f98c0619deffabd56acd9 -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	63168 bytes	686572db787d2b0939aa556d3e79db38	March 19, 2015 @ 15:37
cdnjs	54753 bytes	686572db787d2b0939aa556d3e79db38	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
51596 bytes	-2 bytes	zopfli --i1000000 --mls8 --bsr19 --lazy --ohh	January 31, 2020 @ 19:48
51598 bytes	-8 bytes	zopfli --i100000 --mls8 --bsr19 --lazy --ohh	December 3, 2015 @ 15:00
51606 bytes	-5 bytes	zopfli --i10000 --mls8 --bsr19 --lazy --ohh	November 23, 2015 @ 00:03
51611 bytes	-1 byte	zopfli --i10000 --mls8 --bsr25 --lazy --ohh	October 14, 2015 @ 01:34
51612 bytes	-4 bytes	zopfli --i1000 --mls8 --bsr19 --lazy --ohh	September 21, 2015 @ 18:55
51616 bytes	–	zopfli --i100 --mls8 --bsr19 --lazy --ohh	September 21, 2015 @ 11:32

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	51684	51673	51683	51678	51682	51679	51678	51682	51684	51703	51690	51697	51706	51706	51687
4	51681	51634	51680	51682	51683	51680	51681	51681	51686	51675	51691	51692	51685	51684	51680
6	51623	51638	51637	51681	51679	51681	51684	51682	51681	51691	51683	51684	51684	51705	51683
7	51677	51711	51679	51680	51683	51682	51683	51683	51680	51680	51675	51685	51680	51678	51680
8	51617	51644	51700	51679	51680	51675	51675	51674	51683	51689	51685	51683	51684	51692	51681
9	51618	51631	51692	51680	51680	51681	51682	51676	51681	51686	51684	51691	51684	51686	51680
10	51627	51629	51681	51680	51681	51676	51682	51680	51681	51688	51687	51724	51701	51687	51681
11	51617	51634	51624	51679	51681	51677	51682	51676	51685	51688	51685	51684	51684	51685	51680
12	51619	51709	51679	51680	51680	51675	51675	51681	51697	51684	51684	51684	51684	51675	51683
13	51622	51637	51679	51680	51679	51680	51674	51680	51683	51683	51675	51684	51692	51682	51682
14	51619	51638	51680	51680	51680	51675	51675	51677	51683	51687	51685	51684	51691	51675	51680
15	51618	51632	51623	51677	51701	51681	51682	51686	51680	51700	51675	51692	51700	51678	51680
16	51625	51631	51623	51678	51679	51681	51682	51683	51698	51692	51688	51692	51706	51676	51683
17	51623	51625	51623	51679	51698	51680	51674	51680	51681	51684	51684	51686	51684	51674	51684
18	51620	51632	51625	51697	51682	51679	51684	51677	51684	51689	51689	51725	51699	51674	51683
19	51620	51632	51596	51677	51682	51683	51681	51676	51683	51686	51684	51684	51684	51678	51683
20	51617	51681	51618	51681	51681	51681	51674	51677	51680	51689	51686	51684	51699	51678	51680
21	51618	51634	51624	51681	51680	51676	51676	51676	51680	51689	51683	51685	51683	51704	51684
22	51608	51635	51623	51681	51681	51679	51683	51680	51686	51701	51692	51687	51683	51704	51680
23	51618	51682	51680	51679	51680	51675	51681	51680	51680	51692	51687	51684	51683	51682	51681
25	51616	51634	51603	51680	51680	51681	51682	51676	51680	51685	51675	51724	51688	51680	51683
30	51628	51626	51674	51679	51698	51674	51681	51680	51684	51677	51691	51684	51684	51684	51683
40	51618	51625	51622	51679	51680	51675	51674	51678	51680	51677	51674	51684	51684	51679	51680

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	51616 bytes	–	100%
1,000	51612 bytes	-4 bytes	100%
10,000	51606 bytes	-6 bytes	100%
100,000	51598 bytes	-8 bytes	0.87%
1,000,000	51596 bytes	-2 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)	51839 bytes	+243 bytes (+0.47%)	+62 bytes
1	51777 bytes	+181 bytes (+0.35%)	–
2	51789 bytes	+193 bytes (+0.37%)	+12 bytes
3	51842 bytes	+246 bytes (+0.48%)	+65 bytes
4	51865 bytes	+269 bytes (+0.52%)	+88 bytes
5	51887 bytes	+291 bytes (+0.56%)	+110 bytes
6	51935 bytes	+339 bytes (+0.66%)	+158 bytes
7	51918 bytes	+322 bytes (+0.62%)	+141 bytes
8	51923 bytes	+327 bytes (+0.63%)	+146 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	37839 bytes	-13757 bytes (-26.66%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	44895 bytes	-6701 bytes (-12.99%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	46262 bytes	-5334 bytes (-10.34%)
Brotli (Wikipedia)	brotli	brotli -q 11	47275 bytes	-4321 bytes (-8.37%)
LZMA2 (Wikipedia)	xz	xz -9	48484 bytes	-3112 bytes (-6.03%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	49803 bytes	-1793 bytes (-3.48%)
Zstandard (Wikipedia)	zstd	zstd -19	49925 bytes	-1671 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.