Dojo 1.11.1 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 630213 bytes (615.4k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 164662 bytes (160.8k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	55598 bytes (54.3k)	local copy
gzip -9	55541 bytes (54.2k)	local copy
libdeflate -12	52891 bytes (51.7k)	local copy
7zip -mx=9 -tgzip	52853 bytes (51.6k)	local copy
zultra	52825 bytes (51.6k)	local copy
pigz -11 -n	52819 bytes (51.6k)	local copy
kzip -s0 -rn -b1	52807 bytes (51.6k)	local copy
Zopfli	52715 bytes (51.5k)	local copy
Zopfli (defluff)	52712 bytes (51.5k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.11.1.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.11.1 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 --bsr12 --lazy --ohh

(found March 30, 2016)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	32	--mls32
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 3 more bytes (52712 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-1.11.1/dojo.js --location | md5sum
943b7cb578121d87f425fbec6c385953 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.11.1.min.zopfli.js.gz | md5sum
943b7cb578121d87f425fbec6c385953 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.11.1/dojo.js --location | sha1sum
49f0f85cd6817e2974d78e843e511c3845071ed9 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.11.1.min.zopfli.js.gz | sha1sum
49f0f85cd6817e2974d78e843e511c3845071ed9 -

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
52715 bytes	-3 bytes	zopfli --i1000000 --mls32 --bsr12 --lazy --ohh	March 30, 2016 @ 22:04
52718 bytes	-1 byte	zopfli --i100000 --mls2 --bsr14 --lazy --ohh	March 30, 2016 @ 15:11
52719 bytes	-7 bytes	zopfli --i100000 --mls128 --bsr7 --lazy --ohh	March 30, 2016 @ 11:44
52726 bytes	-2 bytes	zopfli --i10000 --mls64 --bsr21 --lazy --ohh	March 30, 2016 @ 11:31
52728 bytes	-7 bytes	zopfli --i10000 --mls128 --bsr7 --lazy --ohh	March 30, 2016 @ 10:52
52735 bytes	-2 bytes	zopfli --i1000 --mls64 --bsr17 --lazy --ohh	March 30, 2016 @ 10:46
52737 bytes	-1 byte	zopfli --i1000 --mls8 --bsr6 --lazy --ohh	March 30, 2016 @ 10:45
52738 bytes	-7 bytes	zopfli --i1000 --mls2 --bsr7 --lazy --ohh	March 30, 2016 @ 10:45
52745 bytes	–	zopfli --i100 --mls2 --bsr7 --lazy --ohh	March 30, 2016 @ 10:43

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

Most recent activity on March 7, 2022 @ 01:56.

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	52729	52727	52729	52731	52729	52727	52728	52737	52734	52738	52741	52732	52742	52754	52747
4	52763	52731	52730	52728	52729	52728	52744	52736	52735	52738	52734	52731	52738	52736	52736
6	52768	52767	52729	52731	52728	52741	52742	52740	52739	52738	52733	52727	52734	52746	52743
7	52729	52761	52728	52730	52727	52736	52719	52734	52740	52736	52731	52730	52729	52741	52735
8	52761	52757	52729	52729	52729	52728	52732	52736	52743	52739	52731	52743	52737	52739	52742
9	52730	52758	52727	52761	52727	52728	52728	52732	52735	52738	52736	52731	52734	52734	52737
10	52727	52761	52729	52730	52729	52727	52726	52729	52734	52739	52734	52732	52733	52734	52743
11	52726	52729	52764	52731	52726	52726	52728	52729	52736	52738	52734	52731	52738	52734	52743
12	52761	52768	52728	52729	52715	52726	52728	52733	52740	52736	52733	52729	52733	52749	52736
13	52764	52763	52730	52730	52726	52726	52720	52728	52740	52738	52736	52731	52738	52738	52740
14	52718	52763	52728	52731	52726	52719	52744	52732	52734	52737	52734	52730	52735	52743	52742
15	52763	52765	52728	52729	52726	52726	52721	52734	52738	52736	52734	52730	52735	52734	52737
16	52764	52764	52760	52730	52726	52726	52730	52729	52740	52740	52731	52729	52738	52734	52737
17	52764	52764	52729	52729	52719	52727	52730	52736	52734	52738	52737	52734	52738	52734	52737
18	52730	52756	52728	52765	52726	52728	52730	52736	52734	52738	52734	52731	52733	52734	52737
19	52727	52768	52727	52731	52719	52728	52730	52729	52736	52736	52738	52731	52738	52738	52738
20	52763	52761	52729	52729	52726	52728	52730	52734	52736	52737	52735	52729	52733	52738	52737
21	52764	52763	52728	52760	52727	52726	52731	52738	52734	52739	52731	52731	52739	52734	52741
22	52758	52763	52728	52731	52726	52726	52728	52728	52733	52738	52741	52730	52733	52745	52737
23	52762	52761	52728	52729	52719	52732	52730	52728	52737	52738	52733	52730	52734	52734	52740
25	52765	52756	52763	52731	52719	52726	52729	52730	52734	52737	52736	52730	52734	52734	52737
30	52762	52759	52728	52731	52727	52727	52732	52730	52733	52736	52734	52728	52744	52737	52739
40	52763	52754	52730	52731	52727	52726	52728	52731	52734	52738	52733	52732	52732	52738	52741

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	52745 bytes	–	100%
1,000	52733 bytes	-12 bytes	100%
10,000	52725 bytes	-8 bytes	100%
100,000	52718 bytes	-7 bytes	3.77%
1,000,000	52715 bytes	-3 bytes	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)	52883 bytes	+168 bytes (+0.32%)	+76 bytes
1	52807 bytes	+92 bytes (+0.17%)	–
2	52815 bytes	+100 bytes (+0.19%)	+8 bytes
3	52852 bytes	+137 bytes (+0.26%)	+45 bytes
4	52883 bytes	+168 bytes (+0.32%)	+76 bytes
5	52927 bytes	+212 bytes (+0.40%)	+120 bytes
6	52948 bytes	+233 bytes (+0.44%)	+141 bytes
7	52989 bytes	+274 bytes (+0.52%)	+182 bytes
8	53006 bytes	+291 bytes (+0.55%)	+199 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	38832 bytes	-13883 bytes (-26.34%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46296 bytes	-6419 bytes (-12.18%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47178 bytes	-5537 bytes (-10.50%)
Brotli (Wikipedia)	brotli	brotli -q 11	48639 bytes	-4076 bytes (-7.73%)
LZMA2 (Wikipedia)	xz	xz -9	49764 bytes	-2951 bytes (-5.60%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	51255 bytes	-1460 bytes (-2.77%)
Zstandard (Wikipedia)	zstd	zstd -19	51259 bytes	-1456 bytes (-2.76%)

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.