Dojo 1.10.3 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 629493 bytes (614.7k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 163811 bytes (160.0k, 26%).

After GZIP compression these minified files vary in size:

Boot	64881 bytes (63.4k)	CDN
cdnjs	56230 bytes (54.9k)	CDN
gzip -6 (default)	55961 bytes (54.6k)	local copy
gzip -9	55904 bytes (54.6k)	local copy
7zip -mx=9 -tgzip	53240 bytes (52.0k)	local copy
libdeflate -12	53236 bytes (52.0k)	local copy
kzip -s0 -rn -b1	53191 bytes (51.9k)	local copy
pigz -11 -n	53185 bytes (51.9k)	local copy
zultra	53175 bytes (51.9k)	local copy
Zopfli	53007 bytes (51.8k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.10.3.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.10.3 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 3223 bytes by using my Dojo 1.10.3 Zopfli version instead of the best available CDN (6.08% smaller than cdnjs, 53007 vs. 56230 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 --mls2 --bsr13 --lazy --ohh

(found March 15, 2022)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	2	--mls2
block splitting recursion	13	--bsr13
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

Verify file integrity

After decompression, my uncompressed files are identical to the original ones:

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.10.3/dojo.js --location | md5sum
0c720b7cc29cc1028951a5bac3ddf95c -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.10.3.min.zopfli.js.gz | md5sum
0c720b7cc29cc1028951a5bac3ddf95c -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.10.3/dojo.js --location | sha1sum
1f01ee88d6fab7f82b60a3d01a234ebefee331e4 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.10.3.min.zopfli.js.gz | sha1sum
1f01ee88d6fab7f82b60a3d01a234ebefee331e4 -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	64881 bytes	0c720b7cc29cc1028951a5bac3ddf95c	March 19, 2015 @ 15:29
cdnjs	56230 bytes	0c720b7cc29cc1028951a5bac3ddf95c	February 8, 2015 @ 14:45

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
53007 bytes	-1 byte	zopfli --i1000000 --mls2 --bsr13 --lazy --ohh	March 15, 2022 @ 17:23
53008 bytes	-2 bytes	zopfli --i1000000 --mls2 --bsr16 --lazy --ohh	January 29, 2020 @ 22:09
53010 bytes	-1 byte	zopfli --i100000 --mls2 --bsr16 --lazy --ohh	December 7, 2015 @ 11:19
53011 bytes	-3 bytes	zopfli --i100000 --mls2 --bsr22 --lazy --ohh	December 7, 2015 @ 10:43
53014 bytes	-1 byte	zopfli --i10000 --mls2 --bsr13 --lazy --ohh	September 24, 2015 @ 19:40
53015 bytes	-7 bytes	zopfli --i10000 --mls2 --bsr18 --lazy --ohh	September 24, 2015 @ 19:13
53022 bytes	-1 byte	zopfli --i1000 --mls2 --bsr15 --lazy --ohh	September 22, 2015 @ 13:32
53023 bytes	-6 bytes	zopfli --i1000 --mls4 --bsr6 --lazy --ohh	September 21, 2015 @ 13:54
53029 bytes	–	zopfli --i100 --mls4 --bsr12 --lazy --ohh	September 21, 2015 @ 13:05

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

Most recent activity on March 15, 2022 @ 17:23.

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	53058	53067	53085	53086	53086	53088	53091	53097	53098	53092	53116	53091	53093	53126	53099
4	53023	53026	53038	53043	53086	53088	53095	53104	53088	53096	53095	53097	53104	53094	53093
6	53034	53018	53076	53033	53087	53087	53089	53093	53090	53105	53091	53099	53098	53098	53096
7	53116	53111	53124	53088	53097	53087	53090	53087	53090	53112	53091	53089	53089	53107	53091
8	53017	53021	53104	53041	53084	53088	53096	53093	53088	53090	53102	53103	53102	53101	53090
9	53012	53046	53049	53100	53084	53087	53094	53093	53089	53087	53097	53089	53101	53103	53100
10	53041	53048	53048	53086	53085	53088	53091	53087	53089	53101	53096	53090	53088	53103	53099
11	53011	53019	53032	53087	53087	53082	53099	53098	53088	53094	53100	53102	53097	53096	53088
12	53011	53017	53051	53032	53091	53086	53085	53089	53090	53092	53100	53099	53099	53097	53094
13	53007	53019	53050	53031	53084	53094	53088	53093	53088	53098	53105	53088	53099	53098	53089
14	53018	53021	53038	53043	53085	53084	53084	53089	53098	53110	53098	53088	53096	53099	53089
15	53011	53020	53035	53032	53087	53084	53090	53085	53089	53103	53104	53089	53089	53106	53092
16	53008	53019	53028	53034	53085	53087	53086	53100	53088	53103	53099	53089	53097	53096	53101
17	53012	53022	53026	53032	53086	53086	53095	53094	53088	53098	53097	53089	53098	53096	53089
18	53012	53019	53045	53049	53085	53086	53094	53094	53088	53138	53100	53089	53097	53093	53098
19	53018	53020	53028	53040	53086	53087	53086	53087	53088	53106	53094	53102	53098	53096	53093
20	53064	53067	53104	53087	53086	53086	53094	53093	53089	53132	53095	53089	53092	53096	53100
21	53010	53020	53033	53030	53086	53085	53094	53093	53088	53092	53098	53089	53092	53097	53103
22	53011	53021	53026	53030	53085	53085	53094	53091	53088	53094	53095	53089	53101	53114	53088
23	53069	53069	53106	53086	53086	53084	53103	53087	53089	53096	53100	53089	53088	53111	53089
25	53084	53063	53072	53086	53087	53086	53087	53086	53089	53092	53098	53089	53090	53094	53088
30	53011	53059	53020	53086	53083	53085	53086	53088	53089	53097	53094	53089	53089	53098	53090
40	53012	53025	53028	53031	53084	53083	53087	53087	53088	53092	53103	53089	53088	53097	53089

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	53024 bytes	–	100%
1,000	53022 bytes	-2 bytes	100%
10,000	53014 bytes	-8 bytes	100%
100,000	53010 bytes	-4 bytes	3.48%
1,000,000	53007 bytes	-3 bytes	0.58%
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)	53253 bytes	+246 bytes (+0.46%)	+62 bytes
1	53191 bytes	+184 bytes (+0.35%)	–
2	53211 bytes	+204 bytes (+0.38%)	+20 bytes
3	53254 bytes	+247 bytes (+0.47%)	+63 bytes
4	53295 bytes	+288 bytes (+0.54%)	+104 bytes
5	53317 bytes	+310 bytes (+0.58%)	+126 bytes
6	53314 bytes	+307 bytes (+0.58%)	+123 bytes
7	53351 bytes	+344 bytes (+0.65%)	+160 bytes
8	53395 bytes	+388 bytes (+0.73%)	+204 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 - but your browser doesn't support it.

Algorithm	Program	Parameters	Size	Compared To Best Zopfli
ZPAQ (Wikipedia)	zpaq	zpaq -method 69	38854 bytes	-14153 bytes (-26.70%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46084 bytes	-6923 bytes (-13.06%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47559 bytes	-5448 bytes (-10.28%)
Brotli (Wikipedia)	brotli	brotli -q 11	48604 bytes	-4403 bytes (-8.31%)
LZMA2 (Wikipedia)	xz	xz -9	49764 bytes	-3243 bytes (-6.12%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	51212 bytes	-1795 bytes (-3.39%)
Zstandard (Wikipedia)	zstd	zstd -19	51253 bytes	-1754 bytes (-3.31%)

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 2024.
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.