Dojo 1.13.0 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 636347 bytes (621.4k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 166223 bytes (162.3k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	55965 bytes (54.7k)	local copy
gzip -9	55907 bytes (54.6k)	local copy
libdeflate -12	53254 bytes (52.0k)	local copy
7zip -mx=9 -tgzip	53238 bytes (52.0k)	local copy
pigz -11 -n	53161 bytes (51.9k)	local copy
zultra	53158 bytes (51.9k)	local copy
kzip -s0 -rn -b1	53156 bytes (51.9k)	local copy
Zopfli	53070 bytes (51.8k)	local copy
Zopfli (defluff)	53068 bytes (51.8k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.13.0.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.13.0 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 --bsr15 --lazy --ohh

(found September 28, 2017)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	8	--mls8
block splitting recursion	15	--bsr15
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 2 more bytes (53068 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-1.13.0/dojo.js --location | md5sum
d3a213c02d3b4efe9251faf0943e049f -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.0.min.zopfli.js.gz | md5sum
d3a213c02d3b4efe9251faf0943e049f -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.13.0/dojo.js --location | sha1sum
2c8531207a0b0c09532c744860359c819c0dba8e -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.0.min.zopfli.js.gz | sha1sum
2c8531207a0b0c09532c744860359c819c0dba8e -

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
53070 bytes	-1 byte	zopfli --i1000000 --mls8 --bsr15 --lazy --ohh	September 28, 2017 @ 22:11
53071 bytes	-1 byte	zopfli --i100000 --mls8 --bsr15 --lazy --ohh	September 28, 2017 @ 07:03
53072 bytes	-2 bytes	zopfli --i100000 --mls2 --bsr8 --lazy --ohh	September 28, 2017 @ 06:30
53074 bytes	-7 bytes	zopfli --i10000 --mls2 --bsr8 --lazy --ohh	September 27, 2017 @ 16:51
53081 bytes	-1 byte	zopfli --i1000 --mls2 --bsr25 --lazy --ohh	September 27, 2017 @ 14:46
53082 bytes	-1 byte	zopfli --i1000 --mls8 --bsr15 --lazy --ohh	September 27, 2017 @ 14:41
53083 bytes	-1 byte	zopfli --i1000 --mls2 --bsr14 --lazy --ohh	September 27, 2017 @ 14:40
53084 bytes	–	zopfli --i100 --mls8 --bsr22 --lazy --ohh	September 27, 2017 @ 14:02

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

Most recent activity on March 18, 2022 @ 14:17.

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	53077	53078	53078	53078	53076	53074	53075	53075	53092	53093	53092	53080	53089	53113	53112
4	53081	53076	53082	53078	53079	53085	53080	53076	53083	53080	53083	53092	53091	53090	53092
6	53077	53076	53073	53076	53076	53078	53075	53083	53087	53082	53103	53083	53084	53092	53085
7	53075	53118	53076	53118	53077	53091	53087	53088	53080	53083	53101	53091	53085	53104	53089
8	53072	53070	53077	53076	53078	53096	53076	53076	53094	53092	53091	53091	53090	53092	53096
9	53113	53114	53082	53079	53079	53080	53075	53077	53088	53087	53090	53088	53088	53097	53088
10	53075	53113	53076	53117	53091	53100	53080	53075	53083	53087	53102	53078	53085	53097	53094
11	53071	53106	53074	53082	53077	53100	53075	53076	53088	53090	53091	53083	53084	53092	53082
12	53075	53112	53071	53111	53080	53080	53076	53077	53088	53088	53092	53078	53092	53101	53092
13	53075	53075	53071	53076	53076	53091	53075	53077	53087	53088	53091	53093	53087	53097	53087
14	53075	53113	53075	53119	53115	53080	53079	53079	53087	53087	53098	53089	53088	53093	53102
15	53072	53113	53070	53078	53077	53077	53070	53084	53083	53079	53101	53090	53088	53105	53088
16	53077	53111	53075	53115	53081	53076	53078	53088	53087	53087	53091	53085	53084	53094	53088
17	53075	53112	53072	53076	53079	53079	53072	53083	53087	53101	53101	53091	53090	53095	53088
18	53075	53112	53071	53117	53080	53083	53076	53078	53084	53087	53098	53088	53089	53094	53087
19	53077	53104	53071	53077	53116	53084	53079	53078	53088	53088	53091	53078	53089	53095	53088
20	53075	53109	53072	53072	53077	53083	53087	53084	53088	53088	53098	53081	53088	53095	53088
21	53075	53072	53075	53075	53076	53083	53082	53072	53088	53090	53090	53088	53088	53092	53088
22	53111	53114	53070	53078	53077	53078	53075	53084	53083	53088	53101	53089	53087	53094	53088
23	53077	53113	53075	53081	53077	53081	53078	53084	53086	53090	53092	53077	53087	53091	53087
25	53072	53111	53075	53125	53077	53073	53088	53074	53083	53089	53090	53086	53090	53085	53088
30	53075	53112	53071	53078	53080	53078	53076	53077	53087	53091	53098	53089	53088	53081	53085
40	53075	53112	53076	53081	53076	53075	53076	53077	53087	53090	53101	53088	53087	53093	53090

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	53084 bytes	–	100%
1,000	53081 bytes	-3 bytes	100%
10,000	53074 bytes	-7 bytes	100%
100,000	53071 bytes	-3 bytes	7.83%
1,000,000	53070 bytes	-1 byte	2.90%
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)	53229 bytes	+159 bytes (+0.30%)	+73 bytes
1	53156 bytes	+86 bytes (+0.16%)	–
2	53187 bytes	+117 bytes (+0.22%)	+31 bytes
3	53228 bytes	+158 bytes (+0.30%)	+72 bytes
4	53264 bytes	+194 bytes (+0.37%)	+108 bytes
5	53290 bytes	+220 bytes (+0.41%)	+134 bytes
6	53332 bytes	+262 bytes (+0.49%)	+176 bytes
7	53377 bytes	+307 bytes (+0.58%)	+221 bytes
8	53386 bytes	+316 bytes (+0.60%)	+230 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	38986 bytes	-14084 bytes (-26.54%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46560 bytes	-6510 bytes (-12.27%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47509 bytes	-5561 bytes (-10.48%)
Brotli (Wikipedia)	brotli	brotli -q 11	49027 bytes	-4043 bytes (-7.62%)
LZMA2 (Wikipedia)	xz	xz -9	50096 bytes	-2974 bytes (-5.60%)
Zstandard (Wikipedia)	zstd	zstd -19	51672 bytes	-1398 bytes (-2.63%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	51703 bytes	-1367 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.