Dojo 1.10.5 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 632084 bytes (617.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 164576 bytes (160.7k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	55472 bytes (54.2k)	local copy
gzip -9	55408 bytes (54.1k)	local copy
libdeflate -12	52748 bytes (51.5k)	local copy
7zip -mx=9 -tgzip	52722 bytes (51.5k)	local copy
pigz -11 -n	52691 bytes (51.5k)	local copy
zultra	52681 bytes (51.4k)	local copy
kzip -s0 -rn -b1	52674 bytes (51.4k)	local copy
Zopfli	52584 bytes (51.4k)	local copy
Zopfli (defluff)	52581 bytes (51.3k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.10.5.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.10.5 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

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 --mls32 --bsr11 --lazy --ohh

(found March 22, 2016)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	32	--mls32
block splitting recursion	11	--bsr11
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 (52581 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-1.10.5/dojo.js --location | md5sum
6bf182ea8621f7da06adf1b3df6e3cdc -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.10.5.min.zopfli.js.gz | md5sum
6bf182ea8621f7da06adf1b3df6e3cdc -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.10.5/dojo.js --location | sha1sum
315b9c3f37c0781763cff82159823e7aed4bcb0a -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.10.5.min.zopfli.js.gz | sha1sum
315b9c3f37c0781763cff82159823e7aed4bcb0a -

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
52584 bytes	-4 bytes	zopfli --i1000000 --mls32 --bsr11 --lazy --ohh	March 22, 2016 @ 19:44
52588 bytes	-1 byte	zopfli --i1000000 --mls16 --bsr15 --lazy --ohh	March 22, 2016 @ 04:01
52589 bytes	-1 byte	zopfli --i100000 --mls16 --bsr15 --lazy --ohh	March 21, 2016 @ 13:55
52590 bytes	-1 byte	zopfli --i100000 --mls8192 --bsr22 --lazy --ohh	March 21, 2016 @ 12:22
52591 bytes	-4 bytes	zopfli --i10000 --mls8192 --bsr23 --lazy --ohh	March 21, 2016 @ 10:51
52595 bytes	-4 bytes	zopfli --i10000 --mls512 --bsr22 --lazy --ohh	March 21, 2016 @ 10:26
52599 bytes	-2 bytes	zopfli --i1000 --mls16 --bsr15 --lazy --ohh	March 21, 2016 @ 10:16
52601 bytes	-2 bytes	zopfli --i1000 --mls64 --bsr23 --lazy --ohh	March 21, 2016 @ 10:15
52603 bytes	–	zopfli --i100 --mls2 --bsr11 --lazy --ohh	March 21, 2016 @ 10:03

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 @ 12:55.

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	52595	52596	52594	52596	52592	52592	52605	52604	52596	52611	52610	52599	52601	52607	52604
4	52592	52599	52594	52597	52595	52600	52599	52601	52600	52606	52601	52592	52606	52619	52604
6	52594	52595	52596	52597	52600	52611	52603	52607	52594	52607	52596	52609	52601	52603	52605
7	52592	52595	52594	52590	52632	52602	52593	52601	52601	52608	52603	52592	52598	52603	52614
8	52594	52593	52632	52592	52596	52588	52596	52593	52594	52604	52606	52609	52606	52604	52606
9	52593	52593	52594	52592	52594	52592	52594	52609	52595	52607	52598	52593	52606	52599	52612
10	52590	52598	52594	52592	52590	52592	52596	52593	52600	52603	52599	52593	52588	52612	52607
11	52595	52595	52595	52590	52584	52593	52607	52607	52605	52606	52602	52605	52602	52613	52606
12	52592	52595	52593	52592	52593	52595	52597	52597	52607	52607	52601	52593	52601	52617	52602
13	52594	52599	52593	52592	52590	52607	52599	52597	52604	52607	52601	52594	52603	52608	52606
14	52592	52594	52596	52594	52592	52593	52598	52596	52598	52606	52606	52596	52595	52608	52605
15	52589	52595	52594	52588	52598	52590	52593	52597	52602	52605	52604	52596	52602	52604	52608
16	52592	52597	52593	52596	52596	52592	52593	52610	52606	52609	52603	52601	52602	52607	52614
17	52594	52597	52593	52592	52592	52590	52594	52596	52596	52604	52605	52610	52601	52611	52608
18	52598	52597	52595	52593	52593	52603	52598	52609	52605	52606	52604	52600	52597	52618	52605
19	52592	52596	52594	52592	52584	52593	52600	52598	52602	52607	52596	52591	52603	52603	52607
20	52594	52595	52594	52596	52593	52592	52593	52592	52597	52607	52604	52595	52596	52607	52614
21	52593	52595	52593	52593	52598	52610	52598	52610	52592	52603	52603	52593	52592	52617	52609
22	52593	52594	52594	52596	52597	52608	52598	52597	52595	52606	52605	52591	52590	52599	52607
23	52597	52593	52593	52596	52593	52588	52608	52608	52601	52604	52601	52596	52590	52603	52606
25	52588	52598	52597	52592	52596	52592	52607	52608	52597	52602	52604	52594	52602	52610	52609
30	52588	52594	52588	52592	52597	52598	52593	52609	52609	52604	52606	52592	52593	52603	52615
40	52592	52593	52593	52588	52584	52588	52593	52608	52595	52604	52604	52596	52602	52603	52606

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	52603 bytes	–	100%
1,000	52599 bytes	-4 bytes	100%
10,000	52591 bytes	-8 bytes	100%
100,000	52589 bytes	-2 bytes	6.96%
1,000,000	52584 bytes	-5 bytes	3.77%
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)	52736 bytes	+152 bytes (+0.29%)	+62 bytes
1	52674 bytes	+90 bytes (+0.17%)	–
2	52703 bytes	+119 bytes (+0.23%)	+29 bytes
3	52727 bytes	+143 bytes (+0.27%)	+53 bytes
4	52730 bytes	+146 bytes (+0.28%)	+56 bytes
5	52761 bytes	+177 bytes (+0.34%)	+87 bytes
6	52805 bytes	+221 bytes (+0.42%)	+131 bytes
7	52839 bytes	+255 bytes (+0.48%)	+165 bytes
8	52854 bytes	+270 bytes (+0.51%)	+180 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	38743 bytes	-13841 bytes (-26.32%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46196 bytes	-6388 bytes (-12.15%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47111 bytes	-5473 bytes (-10.41%)
Brotli (Wikipedia)	brotli	brotli -q 11	48636 bytes	-3948 bytes (-7.51%)
LZMA2 (Wikipedia)	xz	xz -9	49632 bytes	-2952 bytes (-5.61%)
Zstandard (Wikipedia)	zstd	zstd -19	51157 bytes	-1427 bytes (-2.71%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	51392 bytes	-1192 bytes (-2.27%)

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.