Dojo 1.16.1 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 641607 bytes (626.6k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 168231 bytes (164.3k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	56491 bytes (55.2k)	local copy
gzip -9	56429 bytes (55.1k)	local copy
libdeflate -12	53749 bytes (52.5k)	local copy
7zip -mx=9 -tgzip	53721 bytes (52.5k)	local copy
zultra	53658 bytes (52.4k)	local copy
kzip -s0 -rn -b1	53645 bytes (52.4k)	local copy
pigz -11 -n	53634 bytes (52.4k)	local copy
Zopfli	53553 bytes (52.3k)	local copy
Zopfli (defluff)	53550 bytes (52.3k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.16.1.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.16.1 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 --bsr22 --lazy --ohh

(found February 21, 2020)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	32	--mls32
block splitting recursion	22	--bsr22
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 (53550 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-1.16.1/dojo.js --location | md5sum
f64a79ce070888cdb4c5d500e965393f -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.16.1.min.zopfli.js.gz | md5sum
f64a79ce070888cdb4c5d500e965393f -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.16.1/dojo.js --location | sha1sum
abeb527841301b12c1f9988b4dd8e4785d59f775 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.16.1.min.zopfli.js.gz | sha1sum
abeb527841301b12c1f9988b4dd8e4785d59f775 -

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
53553 bytes	-1 byte	zopfli --i1000000 --mls32 --bsr22 --lazy --ohh	February 21, 2020 @ 19:14
53554 bytes	-1 byte	zopfli --i1000000 --mls128 --bsr17 --lazy --ohh	February 21, 2020 @ 01:32
53555 bytes	-7 bytes	zopfli --i100000 --mls128 --bsr17 --lazy --ohh	February 20, 2020 @ 12:39
53562 bytes	-2 bytes	zopfli --i10000 --mls128 --bsr17 --lazy --ohh	February 19, 2020 @ 22:13
53564 bytes	-1 byte	zopfli --i10000 --mls256 --bsr13 --lazy --ohh	February 19, 2020 @ 21:30
53565 bytes	-1 byte	zopfli --i10000 --mls8 --bsr14 --lazy --ohh	February 19, 2020 @ 19:34
53566 bytes	-1 byte	zopfli --i10000 --mls1024 --bsr7 --lazy --ohh	February 19, 2020 @ 18:50
53567 bytes	-1 byte	zopfli --i1000 --mls128 --bsr16 --lazy --ohh	February 19, 2020 @ 16:33
53568 bytes	-1 byte	zopfli --i1000 --mls128 --bsr19 --lazy --ohh	February 19, 2020 @ 14:49
53569 bytes	–	zopfli --i100 --mls64 --bsr2 --lazy --ohh	February 19, 2020 @ 13:36

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

Most recent activity on February 24, 2022 @ 16:41.

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	53604	53583	53564	53565	53562	53563	53561	53560	53582	53585	53582	53567	53567	53598	53581
4	53605	53604	53606	53564	53566	53578	53564	53563	53572	53572	53569	53567	53565	53586	53567
6	53564	53564	53594	53564	53572	53570	53573	53573	53570	53577	53578	53583	53570	53574	53576
7	53596	53605	53599	53592	53580	53576	53569	53566	53570	53566	53571	53567	53571	53569	53577
8	53608	53596	53600	53565	53566	53579	53560	53563	53579	53570	53580	53573	53581	53579	53574
9	53602	53612	53567	53564	53563	53567	53563	53563	53570	53571	53588	53579	53572	53582	53569
10	53564	53593	53598	53603	53566	53582	53565	53573	53573	53572	53578	53562	53571	53583	53578
11	53600	53579	53567	53595	53565	53564	53562	53562	53572	53571	53579	53587	53572	53588	53570
12	53590	53602	53599	53603	53562	53563	53562	53562	53573	53570	53576	53573	53572	53571	53580
13	53593	53600	53593	53565	53563	53572	53562	53564	53571	53569	53577	53575	53573	53581	53571
14	53565	53579	53565	53600	53562	53563	53568	53562	53572	53572	53578	53587	53572	53578	53581
15	53593	53600	53566	53593	53564	53576	53558	53572	53570	53572	53576	53564	53572	53578	53578
16	53593	53599	53592	53565	53567	53578	53558	53572	53572	53571	53574	53575	53574	53571	53575
17	53590	53599	53599	53601	53567	53577	53554	53572	53570	53571	53586	53586	53571	53578	53581
18	53595	53566	53598	53592	53564	53565	53560	53563	53571	53575	53577	53582	53577	53586	53583
19	53563	53594	53567	53565	53565	53572	53562	53561	53570	53570	53583	53586	53572	53583	53579
20	53595	53564	53596	53564	53565	53567	53562	53572	53582	53570	53575	53565	53572	53587	53570
21	53589	53602	53600	53599	53565	53566	53562	53565	53570	53570	53579	53574	53577	53582	53576
22	53578	53600	53568	53565	53553	53582	53562	53572	53573	53570	53573	53565	53571	53582	53580
23	53564	53591	53554	53564	53564	53576	53560	53570	53574	53571	53573	53582	53572	53580	53580
25	53597	53596	53596	53600	53562	53578	53572	53564	53573	53572	53577	53575	53576	53582	53580
30	53592	53597	53593	53601	53567	53568	53562	53572	53572	53572	53582	53577	53581	53582	53581
40	53592	53596	53592	53564	53564	53579	53560	53573	53571	53569	53572	53582	53571	53583	53579

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	53569 bytes	–	100%
1,000	53567 bytes	-2 bytes	100%
10,000	53559 bytes	-8 bytes	100%
100,000	53555 bytes	-4 bytes	1.45%
1,000,000	53553 bytes	-2 bytes	0.87%
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)	53733 bytes	+180 bytes (+0.34%)	+88 bytes
1	53645 bytes	+92 bytes (+0.17%)	–
2	53670 bytes	+117 bytes (+0.22%)	+25 bytes
3	53692 bytes	+139 bytes (+0.26%)	+47 bytes
4	53726 bytes	+173 bytes (+0.32%)	+81 bytes
5	53723 bytes	+170 bytes (+0.32%)	+78 bytes
6	53725 bytes	+172 bytes (+0.32%)	+80 bytes
7	53766 bytes	+213 bytes (+0.40%)	+121 bytes
8	53795 bytes	+242 bytes (+0.45%)	+150 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	39404 bytes	-14149 bytes (-26.42%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	47010 bytes	-6543 bytes (-12.22%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47919 bytes	-5634 bytes (-10.52%)
Brotli (Wikipedia)	brotli	brotli -q 11	49452 bytes	-4101 bytes (-7.66%)
LZMA2 (Wikipedia)	xz	xz -9	50500 bytes	-3053 bytes (-5.70%)
Zstandard (Wikipedia)	zstd	zstd -19	51870 bytes	-1683 bytes (-3.14%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	52249 bytes	-1304 bytes (-2.43%)

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.