Dojo 1.3.2 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 312194 bytes (304.9k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 81520 bytes (79.6k, 26%).

After GZIP compression these minified files vary in size:

Boot	31889 bytes (31.1k)	CDN
Baidu	27756 bytes (27.1k)	CDN
cdnjs	27748 bytes (27.1k)	CDN
gzip -6 (default)	27650 bytes (27.0k)	local copy
gzip -9	27615 bytes (27.0k)	local copy
Sina	27606 bytes (27.0k)	CDN
Yandex	27603 bytes (27.0k)	CDN
7zip -mx=9 -tgzip	26452 bytes (25.8k)	local copy
kzip -s0 -rn -b6	26417 bytes (25.8k)	local copy
libdeflate -12	26412 bytes (25.8k)	local copy
zultra	26398 bytes (25.8k)	local copy
pigz -11 -n	26385 bytes (25.8k)	local copy
Zopfli	26286 bytes (25.7k)	local copy
Zopfli (defluff)	26285 bytes (25.7k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.3.2.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.3.2 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

Save 1317 bytes by using my Dojo 1.3.2 Zopfli version instead of the best available CDN (5.01% smaller than Yandex, 26286 vs. 27603 bytes):

Download

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 --mls256 --bsr10 --lazy --ohh

(found March 2, 2020)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	256	--mls256
block splitting recursion	10	--bsr10
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 (26285 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-1.3.2/dojo.js --location | md5sum
b1f549685cac85056cea16803ac726d5 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.3.2.min.zopfli.js.gz | md5sum
b1f549685cac85056cea16803ac726d5 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.3.2/dojo.js --location | sha1sum
ad44e1770895b7fa84aff5a56a0f99b855a83769 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.3.2.min.zopfli.js.gz | sha1sum
ad44e1770895b7fa84aff5a56a0f99b855a83769 -

These CDNs send you the original file:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	31889 bytes	b1f549685cac85056cea16803ac726d5	March 19, 2015 @ 15:30
cdnjs	27748 bytes	b1f549685cac85056cea16803ac726d5	February 8, 2015 @ 14:45
Sina	27606 bytes	b1f549685cac85056cea16803ac726d5	April 25, 2019 @ 14:07
Yandex	27603 bytes	b1f549685cac85056cea16803ac726d5	June 20, 2013 @ 11:59

And some CDNs send you a different file:

CDN	Size (compressed)	MD5 (uncompressed)	Comment / Diff	Timestamp
Baidu	27756 bytes	d65e0bca2326a0282be3fd7431634fdf	only whitespaces differ	January 7, 2015 @ 10:16

Note: only the MD5 hashes are shown to keep things simple.

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
26286 bytes	-2 bytes	zopfli --i1000000 --mls256 --bsr10 --lazy --ohh	March 2, 2020 @ 14:56
26288 bytes	-1 byte	zopfli --i100000 --mls256 --bsr10 --lazy --ohh	December 1, 2015 @ 15:54
26289 bytes	-2 bytes	zopfli --i100000 --mls128 --bsr19 --lazy --ohh	December 1, 2015 @ 14:58
26291 bytes	-1 byte	zopfli --i10000 --mls128 --bsr19 --lazy --ohh	November 22, 2015 @ 22:08
26292 bytes	-2 bytes	zopfli --i10000 --mls32 --bsr25 --lazy --ohh	September 23, 2015 @ 21:08
26294 bytes	-2 bytes	zopfli --i1000 --mls32 --bsr25 --lazy --ohh	September 23, 2015 @ 20:47
26296 bytes	-1 byte	zopfli --i1000 --mls256 --bsr10 --lazy --ohh	September 14, 2015 @ 21:58
26297 bytes	-1 byte	zopfli --i1000 --mls64 --bsr10 --lazy --ohh	September 14, 2015 @ 21:50
26298 bytes	-3 bytes	zopfli --i1000 --mls512 --bsr13 --lazy --ohh	September 11, 2015 @ 02:28
26301 bytes	-3 bytes	zopfli --i1000 --mls512 --bsr8 --lazy --ohh	September 11, 2015 @ 02:27
26304 bytes	–	zopfli --i100 --mls512 --bsr12 --lazy --ohh	September 10, 2015 @ 14:57

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

Most recent activity on July 20, 2020 @ 12:47.

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	26365	26370	26372	26373	26345	26377	26378	26381	26380	26380	26373	26368	26370	26374	26377
4	26340	26353	26305	26317	26340	26342	26311	26311	26365	26367	26366	26368	26374	26379	26370
6	26339	26350	26331	26329	26324	26371	26376	26371	26372	26371	26372	26375	26373	26369	26367
7	26346	26341	26344	26349	26337	26302	26377	26387	26371	26367	26366	26373	26376	26373	26367
8	26321	26356	26345	26309	26335	26338	26304	26293	26296	26368	26367	26373	26367	26370	26369
9	26341	26343	26318	26348	26341	26343	26307	26370	26296	26367	26368	26366	26373	26369	26368
10	26343	26342	26342	26335	26298	26294	26335	26286	26304	26366	26365	26369	26371	26374	26373
11	26339	26336	26342	26333	26318	26297	26297	26296	26308	26366	26365	26365	26379	26369	26373
12	26332	26325	26359	26325	26329	26331	26298	26368	26293	26367	26365	26367	26366	26371	26368
13	26331	26353	26336	26327	26314	26311	26295	26326	26293	26366	26365	26366	26383	26372	26368
14	26347	26340	26339	26319	26331	26292	26295	26299	26368	26369	26366	26367	26383	26373	26372
15	26357	26334	26346	26306	26313	26335	26294	26366	26294	26366	26366	26373	26383	26368	26368
16	26341	26343	26340	26314	26339	26299	26303	26300	26309	26369	26368	26367	26375	26372	26370
17	26341	26335	26347	26316	26342	26315	26327	26303	26304	26369	26365	26368	26375	26368	26369
18	26332	26341	26345	26339	26336	26329	26337	26384	26296	26369	26366	26370	26303	26370	26368
19	26341	26340	26343	26329	26337	26299	26289	26373	26294	26368	26372	26372	26371	26370	26370
20	26343	26334	26317	26338	26335	26343	26311	26295	26297	26367	26367	26369	26381	26373	26368
21	26342	26343	26342	26343	26344	26333	26299	26331	26295	26376	26365	26367	26378	26374	26370
22	26357	26311	26335	26340	26322	26344	26339	26371	26374	26372	26374	26374	26347	26372	26366
23	26342	26341	26341	26329	26293	26289	26296	26295	26294	26365	26366	26366	26372	26368	26370
25	26352	26309	26351	26327	26290	26293	26298	26371	26370	26372	26366	26366	26373	26372	26373
30	26339	26327	26343	26327	26331	26329	26296	26295	26312	26388	26368	26369	26380	26371	26368
40	26341	26338	26343	26339	26336	26333	26309	26295	26298	26366	26365	26365	26383	26374	26368

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	26301 bytes	–	100%
1,000	26294 bytes	-7 bytes	100%
10,000	26291 bytes	-3 bytes	100%
100,000	26288 bytes	-3 bytes	1.16%
1,000,000	26286 bytes	-2 bytes	0.29%
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)	26420 bytes	+134 bytes (+0.51%)	+3 bytes
1	26418 bytes	+132 bytes (+0.50%)	+1 byte
2	26442 bytes	+156 bytes (+0.59%)	+25 bytes
3	26421 bytes	+135 bytes (+0.51%)	+4 bytes
4	26454 bytes	+168 bytes (+0.64%)	+37 bytes
5	26431 bytes	+145 bytes (+0.55%)	+14 bytes
6	26417 bytes	+131 bytes (+0.50%)	–
7	26425 bytes	+139 bytes (+0.53%)	+8 bytes
8	26469 bytes	+183 bytes (+0.70%)	+52 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	21304 bytes	-4982 bytes (-18.95%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	23361 bytes	-2925 bytes (-11.13%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	24234 bytes	-2052 bytes (-7.81%)
Brotli (Wikipedia)	brotli	brotli -q 11	24389 bytes	-1897 bytes (-7.22%)
LZMA2 (Wikipedia)	xz	xz -9	25304 bytes	-982 bytes (-3.74%)
Zstandard (Wikipedia)	zstd	zstd -19	25914 bytes	-372 bytes (-1.42%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	26121 bytes	-165 bytes (-0.63%)

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.