Dojo 1.7.2 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 546032 bytes (533.2k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 137786 bytes (134.6k, 25%).

After GZIP compression these minified files vary in size:

Boot	55105 bytes (53.8k)	CDN
Baidu	47938 bytes (46.8k)	CDN
cdnjs	47933 bytes (46.8k)	CDN
gzip -6 (default)	47762 bytes (46.6k)	local copy
gzip -9	47731 bytes (46.6k)	local copy
Yandex	47722 bytes (46.6k)	CDN
libdeflate -12	45562 bytes (44.5k)	local copy
7zip -mx=9 -tgzip	45484 bytes (44.4k)	local copy
kzip -s0 -rn -b1	45409 bytes (44.3k)	local copy
zultra	45403 bytes (44.3k)	local copy
pigz -11 -n	45388 bytes (44.3k)	local copy
Zopfli	45304 bytes (44.2k)	local copy
Zopfli (defluff)	45301 bytes (44.2k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.7.2.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.7.2 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 2418 bytes by using my Dojo 1.7.2 Zopfli version instead of the best available CDN (5.34% smaller than Yandex, 45304 vs. 47722 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 --mls8192 --bsr20 --lazy --ohh

(found February 26, 2020)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	8192	--mls8192
block splitting recursion	20	--bsr20
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 (45301 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-1.7.2/dojo.js --location | md5sum
83f4e75a7c78181e6a364d852f5397b4 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.7.2.min.zopfli.js.gz | md5sum
83f4e75a7c78181e6a364d852f5397b4 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.7.2/dojo.js --location | sha1sum
36856361c0a40bdfc111adaef5c3139511787d46 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.7.2.min.zopfli.js.gz | sha1sum
36856361c0a40bdfc111adaef5c3139511787d46 -

These CDNs send you the original file:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	55105 bytes	83f4e75a7c78181e6a364d852f5397b4	March 19, 2015 @ 15:34
cdnjs	47933 bytes	83f4e75a7c78181e6a364d852f5397b4	February 8, 2015 @ 14:45

And some CDNs send you a different file:

CDN	Size (compressed)	MD5 (uncompressed)	Comment / Diff	Timestamp
Baidu	47938 bytes	5720574194f84d45b11a3c60a4c8553c	only whitespaces differ	January 7, 2015 @ 10:16
Yandex	47722 bytes	50b9955c1eef6d14e234eea2aab42d09	< (function(_1,_2){var _3=function(){},_4=function(it){for(v [...] > (function(_1,_2){var _3=function(){},_4=function(it){for(v [...]	June 20, 2013 @ 11:59

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
45304 bytes	-1 byte	zopfli --i1000000 --mls8192 --bsr20 --lazy --ohh	February 26, 2020 @ 18:48
45305 bytes	-5 bytes	zopfli --i100000 --mls8192 --bsr20 --lazy --ohh	December 2, 2015 @ 14:45
45310 bytes	-6 bytes	zopfli --i10000 --mls8192 --bsr20 --lazy --ohh	November 22, 2015 @ 22:36
45316 bytes	-2 bytes	zopfli --i1000 --mls8192 --bsr20 --lazy --ohh	September 20, 2015 @ 01:31
45318 bytes	-3 bytes	zopfli --i1000 --mls8192 --bsr9 --lazy --ohh	September 10, 2015 @ 22:24
45321 bytes	–	zopfli --i100 --mls8192 --bsr10 --lazy --ohh	September 10, 2015 @ 15:15

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 @ 12:48.

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	45324	45329	45324	45323	45330	45327	45327	45324	45327	45323	45321	45336	45354	45343	45345
4	45317	45327	45325	45315	45323	45324	45327	45327	45324	45338	45331	45334	45354	45347	45329
6	45326	45322	45325	45324	45323	45322	45323	45323	45324	45335	45331	45332	45339	45323	45323
7	45323	45320	45323	45323	45323	45332	45349	45324	45333	45334	45335	45342	45338	45332	45343
8	45323	45325	45323	45323	45324	45322	45321	45320	45322	45339	45331	45337	45323	45317	45317
9	45333	45325	45330	45318	45323	45338	45324	45322	45324	45340	45331	45342	45307	45315	45337
10	45318	45323	45323	45323	45323	45332	45326	45326	45323	45339	45335	45336	45307	45345	45328
11	45332	45319	45325	45318	45325	45330	45324	45326	45323	45341	45330	45332	45333	45326	45338
12	45326	45319	45323	45321	45320	45340	45324	45325	45322	45345	45329	45336	45322	45348	45337
13	45326	45326	45334	45324	45323	45325	45325	45325	45322	45339	45331	45334	45323	45345	45321
14	45324	45321	45323	45323	45322	45332	45322	45324	45324	45334	45329	45334	45331	45318	45317
15	45323	45322	45326	45324	45324	45331	45325	45324	45324	45333	45330	45334	45343	45320	45343
16	45324	45321	45323	45323	45321	45331	45324	45324	45326	45324	45329	45335	45313	45319	45338
17	45324	45326	45330	45325	45323	45330	45323	45324	45326	45339	45331	45333	45333	45342	45337
18	45324	45323	45330	45317	45323	45336	45323	45325	45320	45335	45330	45332	45339	45338	45337
19	45323	45323	45327	45320	45321	45329	45323	45324	45322	45340	45330	45336	45324	45317	45339
20	45327	45324	45330	45318	45323	45330	45322	45321	45319	45339	45330	45333	45304	45316	45337
21	45325	45320	45323	45324	45321	45338	45327	45322	45326	45335	45330	45338	45306	45325	45335
22	45317	45322	45324	45323	45323	45330	45321	45323	45324	45324	45330	45333	45323	45334	45338
23	45323	45324	45327	45326	45323	45331	45323	45326	45322	45349	45331	45333	45323	45333	45344
25	45324	45323	45324	45325	45323	45322	45323	45329	45323	45332	45331	45337	45319	45320	45335
30	45324	45320	45330	45321	45323	45331	45324	45324	45321	45334	45329	45340	45337	45332	45327
40	45318	45319	45325	45320	45321	45338	45324	45326	45323	45343	45330	45333	45328	45322	45336

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	45320 bytes	–	100%
1,000	45316 bytes	-4 bytes	100%
10,000	45310 bytes	-6 bytes	100%
100,000	45305 bytes	-5 bytes	1.16%
1,000,000	45304 bytes	-1 byte	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)	45430 bytes	+126 bytes (+0.28%)	+21 bytes
1	45409 bytes	+105 bytes (+0.23%)	–
2	45431 bytes	+127 bytes (+0.28%)	+22 bytes
3	45463 bytes	+159 bytes (+0.35%)	+54 bytes
4	45494 bytes	+190 bytes (+0.42%)	+85 bytes
5	45475 bytes	+171 bytes (+0.38%)	+66 bytes
6	45500 bytes	+196 bytes (+0.43%)	+91 bytes
7	45542 bytes	+238 bytes (+0.53%)	+133 bytes
8	45572 bytes	+268 bytes (+0.59%)	+163 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	33888 bytes	-11416 bytes (-25.20%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	39726 bytes	-5578 bytes (-12.31%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	40380 bytes	-4924 bytes (-10.87%)
Brotli (Wikipedia)	brotli	brotli -q 11	41706 bytes	-3598 bytes (-7.94%)
LZMA2 (Wikipedia)	xz	xz -9	42708 bytes	-2596 bytes (-5.73%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	43984 bytes	-1320 bytes (-2.91%)
Zstandard (Wikipedia)	zstd	zstd -19	44015 bytes	-1289 bytes (-2.85%)

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.