Dojo 1.8.2 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 599370 bytes (585.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 156515 bytes (152.8k, 26%).

After GZIP compression these minified files vary in size:

Boot	62005 bytes (60.6k)	CDN
Baidu	53788 bytes (52.5k)	CDN
cdnjs	53781 bytes (52.5k)	CDN
gzip -6 (default)	53543 bytes (52.3k)	local copy
gzip -9	53478 bytes (52.2k)	local copy
libdeflate -12	51007 bytes (49.8k)	local copy
7zip -mx=9 -tgzip	50943 bytes (49.7k)	local copy
kzip -s0 -rn -b1	50870 bytes (49.7k)	local copy
pigz -11 -n	50865 bytes (49.7k)	local copy
zultra	50849 bytes (49.7k)	local copy
Zopfli	50722 bytes (49.5k)	local copy
Zopfli (defluff)	50721 bytes (49.5k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.8.2.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.8.2 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 3059 bytes by using my Dojo 1.8.2 Zopfli version instead of the best available CDN (6.03% smaller than cdnjs, 50722 vs. 53781 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 --bsr12 --lazy --ohh

(found February 25, 2020)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	8	--mls8
block splitting recursion	12	--bsr12
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 1 more byte (50721 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-1.8.2/dojo.js --location | md5sum
2e31d09a6207980e63b514527a89d341 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.8.2.min.zopfli.js.gz | md5sum
2e31d09a6207980e63b514527a89d341 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.8.2/dojo.js --location | sha1sum
570b8f4f43022cef7860db8d57ed2d0dd1dad2eb -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.8.2.min.zopfli.js.gz | sha1sum
570b8f4f43022cef7860db8d57ed2d0dd1dad2eb -

These CDNs send you the original file:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	62005 bytes	2e31d09a6207980e63b514527a89d341	March 19, 2015 @ 15:38
cdnjs	53781 bytes	2e31d09a6207980e63b514527a89d341	February 8, 2015 @ 14:45

And some CDNs send you a different file:

CDN	Size (compressed)	MD5 (uncompressed)	Comment / Diff	Timestamp
Baidu	53788 bytes	0117df810f2665a00f2cc5c3764df595	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
50722 bytes	-3 bytes	zopfli --i1000000 --mls8 --bsr12 --lazy --ohh	February 25, 2020 @ 20:49
50725 bytes	-1 byte	zopfli --i100000 --mls8 --bsr12 --lazy --ohh	December 3, 2015 @ 11:04
50726 bytes	-3 bytes	zopfli --i10000 --mls8 --bsr12 --lazy --ohh	October 14, 2015 @ 01:49
50729 bytes	-25 bytes	zopfli --i1000 --mls8 --bsr12 --lazy --ohh	September 19, 2015 @ 15:44
50754 bytes	–	zopfli --i100 --mls8 --bsr12 --lazy --ohh	September 18, 2015 @ 16:15

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	50766	50766	50767	50769	50770	50767	50767	50775	50768	50772	50770	50790	50800	50786	50764
4	50773	50767	50768	50762	50770	50774	50774	50770	50775	50765	50768	50790	50771	50772	50772
6	50765	50767	50765	50763	50779	50774	50766	50772	50776	50784	50789	50786	50793	50795	50766
7	50762	50775	50763	50769	50761	50763	50772	50772	50786	50766	50769	50792	50797	50767	50770
8	50764	50764	50768	50771	50763	50772	50771	50775	50783	50791	50780	50776	50787	50781	50769
9	50764	50771	50764	50763	50785	50770	50770	50777	50764	50763	50764	50785	50788	50783	50769
10	50761	50764	50765	50769	50765	50771	50772	50773	50766	50766	50777	50785	50787	50773	50769
11	50763	50763	50783	50762	50783	50774	50771	50770	50780	50769	50767	50785	50776	50767	50769
12	50762	50765	50722	50762	50784	50774	50772	50773	50766	50756	50773	50785	50788	50763	50769
13	50772	50765	50768	50754	50763	50772	50772	50770	50767	50765	50776	50786	50783	50781	50769
14	50761	50787	50785	50755	50783	50772	50776	50772	50768	50765	50768	50779	50783	50775	50770
15	50766	50762	50763	50790	50763	50763	50771	50773	50781	50763	50763	50786	50787	50773	50769
16	50762	50762	50764	50785	50763	50782	50776	50769	50765	50764	50766	50785	50792	50776	50769
17	50763	50765	50767	50773	50761	50771	50769	50780	50766	50764	50766	50785	50789	50769	50769
18	50763	50762	50767	50765	50769	50763	50772	50771	50765	50772	50766	50785	50786	50774	50769
19	50763	50766	50764	50770	50783	50782	50773	50769	50767	50762	50767	50786	50786	50772	50762
20	50762	50765	50764	50763	50763	50763	50775	50766	50767	50771	50777	50785	50787	50767	50769
21	50761	50765	50764	50765	50763	50764	50769	50772	50770	50785	50779	50785	50789	50767	50769
22	50762	50765	50768	50764	50786	50772	50770	50770	50770	50771	50776	50785	50786	50783	50769
23	50763	50764	50767	50769	50765	50771	50772	50772	50770	50767	50776	50785	50789	50762	50769
25	50770	50763	50767	50786	50763	50771	50771	50770	50770	50764	50767	50784	50787	50781	50769
30	50763	50763	50768	50761	50781	50770	50764	50769	50766	50784	50766	50785	50790	50769	50770
40	50761	50764	50764	50761	50763	50763	50771	50769	50767	50766	50767	50787	50787	50776	50770

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	50754 bytes	–	100%
1,000	50729 bytes	-25 bytes	100%
10,000	50726 bytes	-3 bytes	100%
100,000	50725 bytes	-1 byte	1.16%
1,000,000	50722 bytes	-3 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)	50914 bytes	+192 bytes (+0.38%)	+44 bytes
1	50870 bytes	+148 bytes (+0.29%)	–
2	50884 bytes	+162 bytes (+0.32%)	+14 bytes
3	50910 bytes	+188 bytes (+0.37%)	+40 bytes
4	50960 bytes	+238 bytes (+0.47%)	+90 bytes
5	50983 bytes	+261 bytes (+0.51%)	+113 bytes
6	50993 bytes	+271 bytes (+0.53%)	+123 bytes
7	51016 bytes	+294 bytes (+0.58%)	+146 bytes
8	51019 bytes	+297 bytes (+0.59%)	+149 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	37340 bytes	-13382 bytes (-26.38%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	44198 bytes	-6524 bytes (-12.86%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	45483 bytes	-5239 bytes (-10.33%)
Brotli (Wikipedia)	brotli	brotli -q 11	46636 bytes	-4086 bytes (-8.06%)
LZMA2 (Wikipedia)	xz	xz -9	47732 bytes	-2990 bytes (-5.89%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	49126 bytes	-1596 bytes (-3.15%)
Zstandard (Wikipedia)	zstd	zstd -19	49183 bytes	-1539 bytes (-3.03%)

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.