Dojo 1.11.5 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 634185 bytes (619.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 165807 bytes (161.9k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	55917 bytes (54.6k)	local copy
gzip -9	55865 bytes (54.6k)	local copy
libdeflate -12	53208 bytes (52.0k)	local copy
7zip -mx=9 -tgzip	53191 bytes (51.9k)	local copy
zultra	53132 bytes (51.9k)	local copy
pigz -11 -n	53122 bytes (51.9k)	local copy
kzip -s0 -rn -b1	53107 bytes (51.9k)	local copy
Zopfli	53015 bytes (51.8k)	local copy
Zopfli (defluff)	53014 bytes (51.8k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.11.5.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.11.5 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 --mls8 --bsr15 --lazy --ohh

(found September 28, 2017)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	8	--mls8
block splitting recursion	15	--bsr15
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 (53014 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-1.11.5/dojo.js --location | md5sum
db34b89a6675040994cd52fcb562b074 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.11.5.min.zopfli.js.gz | md5sum
db34b89a6675040994cd52fcb562b074 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.11.5/dojo.js --location | sha1sum
badec07240ae03d5311138a299a877537a9a0b0e -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.11.5.min.zopfli.js.gz | sha1sum
badec07240ae03d5311138a299a877537a9a0b0e -

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
53015 bytes	-2 bytes	zopfli --i1000000 --mls8 --bsr15 --lazy --ohh	September 28, 2017 @ 19:48
53017 bytes	-6 bytes	zopfli --i100000 --mls8 --bsr15 --lazy --ohh	September 27, 2017 @ 23:21
53023 bytes	-4 bytes	zopfli --i10000 --mls8 --bsr15 --lazy --ohh	September 27, 2017 @ 17:00
53027 bytes	-4 bytes	zopfli --i10000 --mls2 --bsr22 --lazy --ohh	September 27, 2017 @ 16:52
53031 bytes	-1 byte	zopfli --i1000 --mls2 --bsr20 --lazy --ohh	September 27, 2017 @ 14:40
53032 bytes	-2 bytes	zopfli --i1000 --mls8 --bsr20 --lazy --ohh	September 27, 2017 @ 14:39
53034 bytes	–	zopfli --i100 --mls8 --bsr20 --lazy --ohh	September 27, 2017 @ 14:11

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

Most recent activity on March 6, 2022 @ 15:46.

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	53026	53026	53027	53027	53029	53029	53031	53031	53029	53027	53042	53031	53039	53057	53058
4	53029	53029	53041	53031	53028	53034	53026	53027	53029	53034	53037	53032	53039	53037	53057
6	53024	53028	53028	53030	53039	53018	53024	53037	53033	53035	53035	53034	53034	53042	53034
7	53060	53071	53024	53044	53029	53039	53034	53028	53034	53031	53032	53031	53036	53050	53039
8	53028	53063	53029	53029	53029	53047	53028	53031	53029	53033	53039	53038	53038	53039	53046
9	53060	53024	53027	53031	53028	53032	53018	53027	53029	53034	53036	53032	53035	53041	53035
10	53067	53062	53070	53042	53047	53027	53025	53027	53033	53034	53038	53029	53035	53041	53047
11	53028	53060	53061	53027	53029	53029	53017	53030	53026	53035	53040	53031	53034	53041	53036
12	53027	53059	53031	53028	53032	53027	53020	53029	53035	53034	53039	53030	53039	53038	53043
13	53027	53027	53062	53030	53025	53029	53024	53027	53030	53037	53038	53041	53034	53041	53038
14	53028	53061	53031	53025	53028	53031	53027	53030	53033	53035	53038	53031	53037	53035	53039
15	53060	53060	53015	53030	53029	53030	53016	53026	53034	53033	53037	53030	53035	53050	53035
16	53063	53060	53024	53042	53033	53024	53024	53027	53032	53034	53037	53031	53034	53040	53045
17	53027	53059	53061	53029	53031	53027	53026	53030	53028	53034	53039	53031	53038	53040	53043
18	53028	53059	53060	53040	53032	53019	53018	53026	53030	53032	53035	53030	53041	53041	53043
19	53065	53060	53060	53030	53033	53029	53016	53029	53028	53035	53038	53030	53039	53041	53039
20	53027	53058	53024	53019	53029	53027	53027	53028	53032	53034	53038	53030	53036	53035	53037
21	53059	53058	53024	53028	53028	53028	53031	53028	53035	53034	53037	53031	53036	53035	53045
22	53027	53063	53059	53026	53029	53027	53027	53029	53032	53034	53038	53028	53034	53041	53043
23	53030	53022	53027	53025	53029	53029	53027	53029	53029	53035	53039	53024	53034	53041	53043
25	53027	53056	53017	53026	53029	53029	53024	53029	53033	53034	53038	53030	53040	53035	53044
30	53059	53019	53024	53026	53033	53016	53028	53026	53029	53033	53040	53031	53035	53038	53035
40	53028	53051	53021	53026	53033	53027	53028	53027	53034	53034	53038	53029	53038	53042	53045

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	53034 bytes	–	100%
1,000	53031 bytes	-3 bytes	100%
10,000	53023 bytes	-8 bytes	100%
100,000	53017 bytes	-6 bytes	4.93%
1,000,000	53015 bytes	-2 bytes	1.74%
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)	53115 bytes	+100 bytes (+0.19%)	+8 bytes
1	53107 bytes	+92 bytes (+0.17%)	–
2	53137 bytes	+122 bytes (+0.23%)	+30 bytes
3	53166 bytes	+151 bytes (+0.28%)	+59 bytes
4	53115 bytes	+100 bytes (+0.19%)	+8 bytes
5	53156 bytes	+141 bytes (+0.27%)	+49 bytes
6	53190 bytes	+175 bytes (+0.33%)	+83 bytes
7	53224 bytes	+209 bytes (+0.39%)	+117 bytes
8	53235 bytes	+220 bytes (+0.41%)	+128 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	38987 bytes	-14028 bytes (-26.46%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46525 bytes	-6490 bytes (-12.24%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47409 bytes	-5606 bytes (-10.57%)
Brotli (Wikipedia)	brotli	brotli -q 11	48889 bytes	-4126 bytes (-7.78%)
LZMA2 (Wikipedia)	xz	xz -9	50044 bytes	-2971 bytes (-5.60%)
Zstandard (Wikipedia)	zstd	zstd -19	51632 bytes	-1383 bytes (-2.61%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	51692 bytes	-1323 bytes (-2.50%)

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.