Dojo 1.8.11 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 611096 bytes (596.8k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 159441 bytes (155.7k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	54007 bytes (52.7k)	local copy
gzip -9	53959 bytes (52.7k)	local copy
7zip -mx=9 -tgzip	51334 bytes (50.1k)	local copy
libdeflate -12	51325 bytes (50.1k)	local copy
pigz -11 -n	51292 bytes (50.1k)	local copy
zultra	51290 bytes (50.1k)	local copy
kzip -s0 -rn -b1	51288 bytes (50.1k)	local copy
Zopfli	51193 bytes (50.0k)	local copy
Zopfli (defluff)	51190 bytes (50.0k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.8.11.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.8.11 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 --bsr16 --lazy --ohh

(found March 16, 2022)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	8	--mls8
block splitting recursion	16	--bsr16
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 (51190 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-1.8.11/dojo.js --location | md5sum
b3f91a306662d7424103d1822d23b5dc -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.8.11.min.zopfli.js.gz | md5sum
b3f91a306662d7424103d1822d23b5dc -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.8.11/dojo.js --location | sha1sum
3cef11443bc538a339e8d7ccb0ace47d8d13c2ef -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.8.11.min.zopfli.js.gz | sha1sum
3cef11443bc538a339e8d7ccb0ace47d8d13c2ef -

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
51193 bytes	-1 byte	zopfli --i1000000 --mls8 --bsr16 --lazy --ohh	March 16, 2022 @ 22:19
51194 bytes	-1 byte	zopfli --i1000000 --mls8 --bsr17 --lazy --ohh	March 16, 2022 @ 14:07
51195 bytes	-7 bytes	zopfli --i100000 --mls2 --bsr11 --lazy --ohh	March 24, 2016 @ 13:42
51202 bytes	-6 bytes	zopfli --i10000 --mls2 --bsr9 --lazy --ohh	March 24, 2016 @ 11:39
51208 bytes	-1 byte	zopfli --i1000 --mls2 --bsr9 --lazy --ohh	March 24, 2016 @ 11:22
51209 bytes	-4 bytes	zopfli --i1000 --mls8 --bsr16 --lazy --ohh	March 24, 2016 @ 11:19
51213 bytes	-1 byte	zopfli --i1000 --mls128 --bsr6 --lazy --ohh	March 24, 2016 @ 11:18
51214 bytes	–	zopfli --i100 --mls8 --bsr6 --lazy --ohh	March 24, 2016 @ 11:05

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

Most recent activity on March 17, 2022 @ 08:48.

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	51208	51207	51208	51210	51205	51213	51208	51212	51221	51226	51230	51228	51228	51235	51239
4	51212	51205	51220	51219	51205	51208	51207	51209	51209	51211	51210	51218	51216	51214	51213
6	51209	51228	51203	51250	51209	51205	51205	51211	51209	51218	51210	51217	51218	51209	51214
7	51206	51203	51254	51219	51228	51209	51206	51220	51208	51206	51209	51219	51215	51215	51213
8	51248	51249	51219	51221	51210	51206	51206	51209	51210	51212	51210	51214	51213	51216	51222
9	51202	51211	51258	51216	51208	51210	51207	51206	51208	51221	51218	51221	51218	51213	51224
10	51211	51207	51241	51250	51208	51210	51206	51208	51210	51211	51210	51220	51215	51206	51226
11	51195	51220	51220	51219	51207	51203	51209	51208	51216	51221	51211	51215	51215	51214	51222
12	51203	51243	51245	51227	51207	51210	51208	51209	51208	51221	51211	51218	51214	51223	51230
13	51246	51232	51242	51218	51208	51210	51205	51208	51216	51218	51210	51216	51214	51216	51228
14	51241	51216	51245	51242	51212	51210	51208	51213	51209	51223	51212	51224	51215	51222	51208
15	51203	51205	51250	51223	51224	51210	51208	51214	51208	51221	51217	51217	51214	51207	51210
16	51211	51215	51193	51220	51209	51207	51206	51211	51208	51221	51210	51217	51222	51214	51210
17	51206	51242	51194	51244	51208	51210	51206	51210	51208	51224	51211	51209	51215	51206	51207
18	51205	51244	51209	51225	51214	51210	51205	51215	51208	51221	51210	51215	51217	51206	51207
19	51203	51249	51219	51220	51210	51212	51206	51209	51212	51221	51216	51215	51217	51207	51217
20	51204	51242	51203	51225	51208	51210	51206	51212	51212	51221	51217	51215	51214	51220	51210
21	51203	51240	51244	51220	51206	51210	51206	51211	51216	51221	51209	51218	51213	51214	51217
22	51209	51203	51245	51241	51210	51206	51210	51208	51209	51220	51217	51218	51214	51208	51223
23	51202	51204	51209	51222	51207	51210	51206	51211	51216	51221	51218	51215	51215	51216	51216
25	51197	51243	51204	51219	51216	51210	51207	51208	51215	51221	51211	51219	51217	51221	51210
30	51198	51206	51202	51221	51208	51211	51208	51209	51210	51218	51211	51215	51215	51210	51213
40	51204	51241	51207	51223	51208	51210	51209	51211	51210	51221	51212	51218	51214	51221	51217

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	51214 bytes	–	100%
1,000	51208 bytes	-6 bytes	100%
10,000	51201 bytes	-7 bytes	100%
100,000	51195 bytes	-6 bytes	1.74%
1,000,000	51193 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)	51367 bytes	+174 bytes (+0.34%)	+79 bytes
1	51288 bytes	+95 bytes (+0.19%)	–
2	51324 bytes	+131 bytes (+0.26%)	+36 bytes
3	51355 bytes	+162 bytes (+0.32%)	+67 bytes
4	51367 bytes	+174 bytes (+0.34%)	+79 bytes
5	51410 bytes	+217 bytes (+0.42%)	+122 bytes
6	51414 bytes	+221 bytes (+0.43%)	+126 bytes
7	51423 bytes	+230 bytes (+0.45%)	+135 bytes
8	51439 bytes	+246 bytes (+0.48%)	+151 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	37711 bytes	-13482 bytes (-26.34%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	44956 bytes	-6237 bytes (-12.18%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	45811 bytes	-5382 bytes (-10.51%)
Brotli (Wikipedia)	brotli	brotli -q 11	47194 bytes	-3999 bytes (-7.81%)
LZMA2 (Wikipedia)	xz	xz -9	48220 bytes	-2973 bytes (-5.81%)
Zstandard (Wikipedia)	zstd	zstd -19	49754 bytes	-1439 bytes (-2.81%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	49818 bytes	-1375 bytes (-2.69%)

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.