Dojo 1.13.4 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 637186 bytes (622.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 167223 bytes (163.3k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	56228 bytes (54.9k)	local copy
gzip -9	56167 bytes (54.9k)	local copy
7zip -mx=9 -tgzip	53478 bytes (52.2k)	local copy
libdeflate -12	53475 bytes (52.2k)	local copy
zultra	53409 bytes (52.2k)	local copy
kzip -s0 -rn -b1	53396 bytes (52.1k)	local copy
pigz -11 -n	53377 bytes (52.1k)	local copy
Zopfli	53302 bytes (52.1k)	local copy
Zopfli (defluff)	53298 bytes (52.0k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.13.4.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.13.4 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 --mls64 --bsr25 --lazy --ohh

(found February 22, 2019)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	64	--mls64
block splitting recursion	25	--bsr25
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 4 more bytes (53298 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-1.13.4/dojo.js --location | md5sum
bd7e6b9fb1155d7aef77c440e022ec46 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.4.min.zopfli.js.gz | md5sum
bd7e6b9fb1155d7aef77c440e022ec46 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.13.4/dojo.js --location | sha1sum
6643a760e156da946f3706ec13fbc1c3e90603ec -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.4.min.zopfli.js.gz | sha1sum
6643a760e156da946f3706ec13fbc1c3e90603ec -

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
53302 bytes	-1 byte	zopfli --i1000000 --mls64 --bsr25 --lazy --ohh	February 22, 2019 @ 06:17
53303 bytes	-8 bytes	zopfli --i100000 --mls4 --bsr11 --lazy --ohh	February 20, 2019 @ 00:36
53311 bytes	-2 bytes	zopfli --i10000 --mls4 --bsr11 --lazy --ohh	February 19, 2019 @ 14:42
53313 bytes	-2 bytes	zopfli --i10000 --mls4 --bsr6 --lazy --ohh	February 19, 2019 @ 14:21
53315 bytes	-2 bytes	zopfli --i10000 --mls512 --bsr2 --lazy --ohh	February 19, 2019 @ 13:35
53317 bytes	-1 byte	zopfli --i1000 --mls4 --bsr18 --lazy --ohh	February 19, 2019 @ 10:06
53318 bytes	-1 byte	zopfli --i1000 --mls4 --bsr11 --lazy --ohh	February 19, 2019 @ 09:10
53319 bytes	-1 byte	zopfli --i1000 --mls4 --bsr14 --lazy --ohh	February 19, 2019 @ 08:53
53320 bytes	-1 byte	zopfli --i1000 --mls256 --bsr12 --lazy --ohh	February 19, 2019 @ 07:48
53321 bytes	–	zopfli --i100 --mls256 --bsr30 --lazy --ohh	February 18, 2019 @ 20:58

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

Most recent activity on March 8, 2022 @ 02:14.

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	53313	53317	53317	53318	53314	53316	53315	53316	53315	53317	53333	53331	53327	53346	53337
4	53345	53312	53315	53316	53318	53323	53317	53312	53316	53306	53321	53328	53331	53327	53326
6	53344	53313	53313	53315	53315	53318	53302	53324	53320	53313	53319	53321	53322	53332	53323
7	53357	53304	53313	53316	53315	53313	53303	53317	53321	53315	53333	53324	53316	53334	53322
8	53346	53304	53347	53315	53312	53324	53312	53314	53325	53328	53327	53329	53334	53326	53327
9	53313	53304	53315	53316	53317	53319	53314	53312	53320	53321	53324	53322	53323	53339	53329
10	53312	53312	53313	53313	53317	53327	53313	53316	53321	53345	53316	53316	53322	53327	53326
11	53313	53303	53312	53315	53317	53325	53311	53305	53321	53325	53324	53328	53327	53328	53333
12	53339	53342	53341	53315	53317	53319	53312	53311	53321	53314	53318	53320	53326	53326	53328
13	53344	53314	53314	53316	53315	53313	53314	53318	53320	53345	53324	53324	53328	53334	53325
14	53314	53312	53314	53346	53317	53319	53314	53315	53320	53334	53325	53323	53331	53332	53325
15	53342	53337	53314	53315	53318	53318	53311	53321	53321	53309	53330	53325	53322	53337	53325
16	53346	53343	53339	53346	53314	53311	53311	53314	53320	53314	53325	53323	53327	53336	53321
17	53336	53304	53317	53316	53314	53314	53311	53312	53320	53334	53323	53330	53325	53322	53325
18	53313	53304	53313	53315	53314	53318	53311	53313	53321	53325	53326	53324	53321	53331	53329
19	53340	53304	53314	53315	53314	53316	53311	53314	53322	53344	53329	53323	53324	53332	53320
20	53339	53312	53314	53314	53313	53315	53322	53321	53321	53322	53315	53323	53322	53326	53321
21	53338	53339	53335	53314	53314	53318	53315	53304	53320	53314	53325	53328	53325	53331	53329
22	53343	53311	53315	53315	53315	53314	53311	53313	53325	53347	53326	53326	53323	53325	53328
23	53313	53313	53314	53315	53313	53334	53312	53321	53321	53313	53325	53325	53323	53339	53322
25	53344	53341	53340	53315	53313	53302	53321	53311	53326	53334	53325	53325	53323	53324	53328
30	53342	53336	53316	53315	53313	53328	53314	53313	53321	53325	53322	53325	53325	53334	53325
40	53344	53313	53313	53317	53314	53315	53312	53314	53320	53312	53329	53322	53331	53333	53325

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	53321 bytes	–	100%
1,000	53317 bytes	-4 bytes	100%
10,000	53310 bytes	-7 bytes	100%
100,000	53303 bytes	-7 bytes	4.06%
1,000,000	53302 bytes	-1 byte	1.16%
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)	53476 bytes	+174 bytes (+0.33%)	+80 bytes
1	53396 bytes	+94 bytes (+0.18%)	–
2	53426 bytes	+124 bytes (+0.23%)	+30 bytes
3	53449 bytes	+147 bytes (+0.28%)	+53 bytes
4	53476 bytes	+174 bytes (+0.33%)	+80 bytes
5	53486 bytes	+184 bytes (+0.35%)	+90 bytes
6	53474 bytes	+172 bytes (+0.32%)	+78 bytes
7	53515 bytes	+213 bytes (+0.40%)	+119 bytes
8	53540 bytes	+238 bytes (+0.45%)	+144 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	39184 bytes	-14118 bytes (-26.49%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46781 bytes	-6521 bytes (-12.23%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47742 bytes	-5560 bytes (-10.43%)
Brotli (Wikipedia)	brotli	brotli -q 11	49217 bytes	-4085 bytes (-7.66%)
LZMA2 (Wikipedia)	xz	xz -9	50288 bytes	-3014 bytes (-5.65%)
Zstandard (Wikipedia)	zstd	zstd -19	51629 bytes	-1673 bytes (-3.14%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	51928 bytes	-1374 bytes (-2.58%)

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.