Dojo 1.4.3 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 375088 bytes (366.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 89269 bytes (87.2k, 24%).

After GZIP compression these minified files vary in size:

Boot	35018 bytes (34.2k)	CDN
Baidu	30531 bytes (29.8k)	CDN
cdnjs	30522 bytes (29.8k)	CDN
gzip -6 (default)	30422 bytes (29.7k)	local copy
gzip -9	30385 bytes (29.7k)	local copy
Sina	30373 bytes (29.7k)	CDN
libdeflate -12	29065 bytes (28.4k)	local copy
7zip -mx=9 -tgzip	29024 bytes (28.3k)	local copy
kzip -s0 -rn -b0	29007 bytes (28.3k)	local copy
zultra	28969 bytes (28.3k)	local copy
pigz -11 -n	28954 bytes (28.3k)	local copy
Zopfli	28870 bytes (28.2k)	local copy
Zopfli (defluff)	28869 bytes (28.2k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.4.3.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.4.3 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 1503 bytes by using my Dojo 1.4.3 Zopfli version instead of the best available CDN (5.21% smaller than Sina, 28870 vs. 30373 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 --mls64 --bsr30 --lazy --ohh

(found February 29, 2020)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	64	--mls64
block splitting recursion	30	--bsr30
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 (28869 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-1.4.3/dojo.js --location | md5sum
ab083c0ee8fd32de6a272b2b38cd567b -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.4.3.min.zopfli.js.gz | md5sum
ab083c0ee8fd32de6a272b2b38cd567b -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.4.3/dojo.js --location | sha1sum
2c11746af7d894ed4b92d3fa69d6432eaad20343 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.4.3.min.zopfli.js.gz | sha1sum
2c11746af7d894ed4b92d3fa69d6432eaad20343 -

These CDNs send you the original file:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	35018 bytes	ab083c0ee8fd32de6a272b2b38cd567b	March 19, 2015 @ 15:31
cdnjs	30522 bytes	ab083c0ee8fd32de6a272b2b38cd567b	February 8, 2015 @ 14:45
Sina	30373 bytes	ab083c0ee8fd32de6a272b2b38cd567b	April 25, 2019 @ 14:07

And some CDNs send you a different file:

CDN	Size (compressed)	MD5 (uncompressed)	Comment / Diff	Timestamp
Baidu	30531 bytes	f4479e3a85a03a6d0179667b64e801d9	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
28870 bytes	-1 byte	zopfli --i1000000 --mls64 --bsr30 --lazy --ohh	February 29, 2020 @ 13:39
28871 bytes	-4 bytes	zopfli --i100000 --mls64 --bsr30 --lazy --ohh	December 1, 2015 @ 16:42
28875 bytes	-4 bytes	zopfli --i10000 --mls64 --bsr30 --lazy --ohh	September 24, 2015 @ 11:53
28879 bytes	-8 bytes	zopfli --i1000 --mls64 --bsr30 --lazy --ohh	September 24, 2015 @ 11:50
28887 bytes	–	zopfli --i100 --mls64 --bsr30 --lazy --ohh	September 24, 2015 @ 11:42

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 @ 12:56.

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	28943	28939	28952	28949	28944	28968	28958	28953	28960	28961	28961	28955	28970	28956	28958
4	28925	28951	28941	28949	28923	28914	28915	28931	28930	28952	28925	28960	28957	28960	28964
6	28922	28924	28917	28923	28928	28917	28931	28945	28940	28959	28935	28961	28904	28959	28956
7	28924	28929	28934	28932	28945	28925	28918	28919	28938	28949	28936	28962	28957	28959	28957
8	28921	28917	28918	28928	28923	28929	28929	28932	28924	28927	28927	28951	28958	28958	28960
9	28934	28925	28920	28920	28917	28921	28914	28911	28943	28961	28928	28952	28942	28952	28953
10	28927	28924	28923	28925	28921	28918	28918	28919	28939	28954	28939	28951	28923	28961	28950
11	28927	28918	28914	28909	28939	28908	28918	28919	28923	28953	28931	28952	28957	28959	28960
12	28921	28917	28919	28927	28919	28912	28910	28919	28928	28910	28915	28897	28958	28954	28961
13	28916	28912	28918	28918	28909	28916	28920	28924	28926	28913	28912	28895	28903	28952	28952
14	28908	28911	28906	28913	28910	28910	28916	28923	28925	28954	28914	28954	28902	28958	28958
15	28904	28916	28933	28914	28910	28910	28920	28924	28921	28917	28907	28960	28959	28961	28964
16	28911	28917	28907	28913	28922	28908	28919	28909	28926	28917	28930	28951	28943	28958	28958
17	28912	28928	28904	28931	28926	28917	28918	28919	28922	28916	28919	28926	28959	28959	28958
18	28916	28901	28898	28921	28911	28918	28921	28913	28921	28924	28919	28951	28904	28966	28958
19	28919	28917	28932	28919	28911	28920	28914	28932	28919	28923	28950	28957	28959	28952	28952
20	28897	28898	28890	28909	28901	28928	28920	28931	28912	28914	28928	28954	28959	28961	28953
21	28918	28925	28930	28922	28926	28902	28951	28911	28930	28917	28935	28955	28940	28959	28950
22	28897	28897	28931	28912	28920	28922	28931	28931	28929	28950	28933	28960	28944	28957	28958
23	28927	28911	28911	28908	28910	28915	28921	28912	28915	28912	28934	28960	28947	28954	28951
25	28908	28911	28935	28913	28934	28910	28918	28921	28921	28913	28914	28919	28902	28959	28958
30	28928	28919	28912	28908	28910	28870	28916	28935	28927	28917	28913	28952	28898	28952	28952
40	28911	28908	28916	28915	28916	28915	28919	28923	28929	28913	28906	28954	28968	28953	28952

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	28887 bytes	–	100%
1,000	28879 bytes	-8 bytes	100%
10,000	28875 bytes	-4 bytes	100%
100,000	28871 bytes	-4 bytes	0.58%
1,000,000	28870 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)	29007 bytes	+137 bytes (+0.47%)	–
1	29007 bytes	+137 bytes (+0.47%)	–
2	29050 bytes	+180 bytes (+0.62%)	+43 bytes
3	29021 bytes	+151 bytes (+0.52%)	+14 bytes
4	29043 bytes	+173 bytes (+0.60%)	+36 bytes
5	29033 bytes	+163 bytes (+0.56%)	+26 bytes
6	29022 bytes	+152 bytes (+0.53%)	+15 bytes
7	29030 bytes	+160 bytes (+0.55%)	+23 bytes
8	29075 bytes	+205 bytes (+0.71%)	+68 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	22987 bytes	-5883 bytes (-20.38%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	25768 bytes	-3102 bytes (-10.74%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	26626 bytes	-2244 bytes (-7.77%)
Brotli (Wikipedia)	brotli	brotli -q 11	26822 bytes	-2048 bytes (-7.09%)
LZMA2 (Wikipedia)	xz	xz -9	27712 bytes	-1158 bytes (-4.01%)
Zstandard (Wikipedia)	zstd	zstd -19	28471 bytes	-399 bytes (-1.38%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	28583 bytes	-287 bytes (-0.99%)

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.