Dojo 1.8.7 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 609972 bytes (595.7k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 159258 bytes (155.5k, 26%).

After GZIP compression these minified files vary in size:

Boot	63163 bytes (61.7k)	CDN
cdnjs	54754 bytes (53.5k)	CDN
gzip -6 (default)	54496 bytes (53.2k)	local copy
gzip -9	54428 bytes (53.2k)	local copy
libdeflate -12	51870 bytes (50.7k)	local copy
7zip -mx=9 -tgzip	51858 bytes (50.6k)	local copy
pigz -11 -n	51781 bytes (50.6k)	local copy
kzip -s0 -rn -b1	51779 bytes (50.6k)	local copy
zultra	51774 bytes (50.6k)	local copy
Zopfli	51600 bytes (50.4k)	local copy
Zopfli (defluff)	51597 bytes (50.4k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.8.7.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.8.7 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 3154 bytes by using my Dojo 1.8.7 Zopfli version instead of the best available CDN (6.11% smaller than cdnjs, 51600 vs. 54754 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 --bsr8 --lazy --ohh

(found January 31, 2020)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	2	--mls2
block splitting recursion	8	--bsr8
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 (51597 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-1.8.7/dojo.js --location | md5sum
19561dca0ddfc2a454bc7491658629d8 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.8.7.min.zopfli.js.gz | md5sum
19561dca0ddfc2a454bc7491658629d8 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.8.7/dojo.js --location | sha1sum
a7370a3f5a352e21cb601ec50d1f76592d98f330 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.8.7.min.zopfli.js.gz | sha1sum
a7370a3f5a352e21cb601ec50d1f76592d98f330 -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	63163 bytes	19561dca0ddfc2a454bc7491658629d8	March 19, 2015 @ 15:40
cdnjs	54754 bytes	19561dca0ddfc2a454bc7491658629d8	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
51600 bytes	-1 byte	zopfli --i1000000 --mls2 --bsr8 --lazy --ohh	January 31, 2020 @ 19:57
51601 bytes	-2 bytes	zopfli --i100000 --mls2 --bsr8 --lazy --ohh	December 3, 2015 @ 12:57
51603 bytes	-7 bytes	zopfli --i100000 --mls8 --bsr6 --lazy --ohh	December 3, 2015 @ 12:12
51610 bytes	-3 bytes	zopfli --i10000 --mls2 --bsr8 --lazy --ohh	October 13, 2015 @ 23:11
51613 bytes	-1 byte	zopfli --i1000 --mls2 --bsr7 --lazy --ohh	September 23, 2015 @ 00:29
51614 bytes	-3 bytes	zopfli --i1000 --mls8 --bsr6 --lazy --ohh	September 19, 2015 @ 10:34
51617 bytes	-2 bytes	zopfli --i1000 --mls8 --bsr13 --lazy --ohh	September 19, 2015 @ 10:30
51619 bytes	–	zopfli --i100 --mls8 --bsr6 --lazy --ohh	September 18, 2015 @ 15:57

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

Most recent activity on March 16, 2022 @ 15:08.

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	51689	51678	51686	51681	51683	51682	51681	51686	51687	51706	51693	51700	51710	51710	51691
4	51684	51636	51647	51680	51686	51684	51684	51685	51690	51676	51687	51696	51689	51689	51685
6	51620	51642	51603	51680	51683	51685	51688	51686	51685	51694	51687	51687	51687	51706	51687
7	51600	51680	51719	51684	51688	51685	51686	51687	51684	51684	51678	51689	51684	51680	51684
8	51600	51624	51692	51683	51683	51679	51679	51678	51687	51693	51689	51686	51687	51696	51686
9	51622	51640	51697	51679	51684	51685	51685	51681	51684	51698	51688	51695	51687	51681	51685
10	51626	51633	51679	51683	51686	51683	51686	51684	51684	51692	51690	51694	51702	51686	51685
11	51622	51630	51680	51678	51684	51680	51686	51681	51690	51695	51689	51688	51688	51690	51684
12	51623	51612	51694	51707	51684	51679	51679	51684	51702	51687	51688	51687	51687	51678	51687
13	51627	51638	51616	51680	51684	51684	51678	51684	51687	51687	51688	51688	51696	51688	51684
14	51622	51643	51628	51679	51684	51679	51679	51681	51685	51693	51687	51687	51695	51688	51684
15	51621	51627	51679	51679	51711	51685	51685	51689	51684	51705	51680	51695	51703	51680	51685
16	51629	51625	51620	51682	51684	51684	51686	51686	51702	51695	51692	51695	51709	51682	51687
17	51628	51639	51694	51683	51707	51684	51678	51684	51684	51687	51687	51690	51687	51677	51687
18	51624	51626	51694	51704	51685	51683	51688	51682	51687	51690	51695	51695	51702	51676	51687
19	51623	51633	51695	51681	51686	51688	51684	51681	51687	51690	51688	51688	51687	51682	51687
20	51621	51631	51602	51681	51682	51686	51678	51681	51684	51691	51687	51688	51702	51680	51684
21	51622	51626	51694	51684	51684	51680	51680	51680	51684	51691	51687	51688	51687	51708	51687
22	51619	51628	51624	51684	51685	51683	51687	51683	51690	51704	51696	51690	51687	51710	51684
23	51623	51631	51688	51680	51711	51680	51684	51687	51685	51696	51691	51688	51686	51689	51684
25	51622	51625	51627	51683	51711	51686	51685	51681	51684	51688	51680	51694	51687	51684	51686
30	51621	51630	51679	51683	51686	51679	51685	51685	51688	51680	51695	51688	51703	51681	51687
40	51622	51628	51698	51680	51684	51679	51678	51683	51684	51693	51678	51687	51688	51683	51684

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	51619 bytes	–	100%
1,000	51613 bytes	-6 bytes	100%
10,000	51610 bytes	-3 bytes	100%
100,000	51601 bytes	-9 bytes	1.16%
1,000,000	51600 bytes	-1 byte	0.58%
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)	51845 bytes	+245 bytes (+0.47%)	+66 bytes
1	51779 bytes	+179 bytes (+0.35%)	–
2	51798 bytes	+198 bytes (+0.38%)	+19 bytes
3	51843 bytes	+243 bytes (+0.47%)	+64 bytes
4	51870 bytes	+270 bytes (+0.52%)	+91 bytes
5	51889 bytes	+289 bytes (+0.56%)	+110 bytes
6	51932 bytes	+332 bytes (+0.64%)	+153 bytes
7	51919 bytes	+319 bytes (+0.62%)	+140 bytes
8	51935 bytes	+335 bytes (+0.65%)	+156 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	37840 bytes	-13760 bytes (-26.67%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	44899 bytes	-6701 bytes (-12.99%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	46266 bytes	-5334 bytes (-10.34%)
Brotli (Wikipedia)	brotli	brotli -q 11	47342 bytes	-4258 bytes (-8.25%)
LZMA2 (Wikipedia)	xz	xz -9	48480 bytes	-3120 bytes (-6.05%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	49807 bytes	-1793 bytes (-3.47%)
Zstandard (Wikipedia)	zstd	zstd -19	49927 bytes	-1673 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.