Dojo 1.14.9 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 639284 bytes (624.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 167921 bytes (164.0k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	56423 bytes (55.1k)	local copy
gzip -9	56351 bytes (55.0k)	local copy
libdeflate -12	53674 bytes (52.4k)	local copy
7zip -mx=9 -tgzip	53646 bytes (52.4k)	local copy
kzip -s0 -rn -b1	53574 bytes (52.3k)	local copy
pigz -11 -n	53572 bytes (52.3k)	local copy
zultra	53568 bytes (52.3k)	local copy
Zopfli	53483 bytes (52.2k)	local copy
Zopfli (defluff)	53482 bytes (52.2k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.14.9.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.14.9 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 --mls256 --bsr2 --lazy --ohh

(found March 4, 2022)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	256	--mls256
block splitting recursion	2	--bsr2
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 (53482 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-1.14.9/dojo.js --location | md5sum
3ce962df7124dddf37cef2a53a3f6f2f -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.14.9.min.zopfli.js.gz | md5sum
3ce962df7124dddf37cef2a53a3f6f2f -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.14.9/dojo.js --location | sha1sum
5aa7b2fee97ec118052f66ba8f50d639b241fde2 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.14.9.min.zopfli.js.gz | sha1sum
5aa7b2fee97ec118052f66ba8f50d639b241fde2 -

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
53483 bytes	-4 bytes	zopfli --i1000000 --mls256 --bsr2 --lazy --ohh	March 4, 2022 @ 01:25
53487 bytes	-1 byte	zopfli --i100000 --mls256 --bsr2 --lazy --ohh	March 3, 2022 @ 16:16
53488 bytes	-4 bytes	zopfli --i100000 --mls128 --bsr40 --lazy --ohh	March 3, 2022 @ 13:34
53492 bytes	-1 byte	zopfli --i10000 --mls128 --bsr40 --lazy --ohh	February 25, 2022 @ 13:54
53493 bytes	-1 byte	zopfli --i10000 --mls128 --bsr6 --lazy --ohh	February 25, 2022 @ 10:25
53494 bytes	-1 byte	zopfli --i10000 --mls8192 --bsr9 --lazy --ohh	February 25, 2022 @ 10:11
53495 bytes	-4 bytes	zopfli --i10000 --mls8 --bsr30 --lazy --ohh	February 25, 2022 @ 05:30
53499 bytes	-1 byte	zopfli --i1000 --mls128 --bsr6 --lazy --ohh	February 24, 2022 @ 20:50
53500 bytes	-1 byte	zopfli --i1000 --mls32 --bsr40 --lazy --ohh	February 24, 2022 @ 17:09
53501 bytes	-2 bytes	zopfli --i1000 --mls256 --bsr2 --lazy --ohh	February 24, 2022 @ 17:07
53503 bytes	–	zopfli --i100 --mls8192 --bsr9 --lazy --ohh	February 24, 2022 @ 15:08

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

Most recent activity on March 4, 2022 @ 10:01.

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	53523	53526	53497	53489	53497	53494	53500	53483	53505	53513	53505	53499	53498	53516	53511
4	53528	53523	53524	53497	53500	53498	53497	53494	53500	53497	53497	53503	53499	53508	53502
6	53521	53528	53519	53495	53501	53501	53493	53505	53500	53505	53511	53513	53501	53507	53505
7	53530	53527	53523	53496	53507	53499	53495	53496	53497	53499	53513	53500	53502	53495	53501
8	53520	53526	53521	53530	53497	53500	53495	53495	53510	53510	53514	53519	53508	53504	53503
9	53499	53518	53502	53496	53497	53501	53495	53495	53503	53499	53515	53512	53494	53509	53508
10	53495	53519	53497	53529	53494	53494	53497	53494	53503	53500	53506	53497	53495	53506	53503
11	53509	53506	53519	53495	53494	53493	53495	53495	53503	53499	53504	53496	53500	53496	53499
12	53529	53519	53520	53528	53494	53494	53494	53495	53503	53499	53510	53495	53501	53500	53504
13	53521	53504	53497	53496	53496	53501	53493	53495	53503	53507	53507	53513	53495	53506	53502
14	53512	53509	53522	53529	53498	53497	53500	53495	53503	53502	53507	53496	53501	53504	53501
15	53520	53517	53518	53496	53498	53499	53488	53495	53500	53500	53507	53501	53499	53513	53501
16	53523	53519	53520	53527	53498	53500	53493	53501	53502	53496	53501	53504	53501	53500	53505
17	53520	53520	53530	53506	53498	53500	53495	53500	53503	53500	53505	53518	53499	53500	53514
18	53516	53525	53493	53524	53495	53502	53493	53499	53503	53499	53509	53514	53503	53506	53515
19	53508	53527	53498	53496	53498	53500	53493	53493	53500	53499	53510	53512	53496	53508	53504
20	53524	53518	53525	53498	53497	53500	53493	53499	53503	53499	53513	53513	53497	53494	53504
21	53522	53517	53520	53495	53500	53497	53493	53496	53503	53499	53511	53504	53494	53499	53505
22	53515	53527	53519	53525	53497	53500	53493	53494	53500	53499	53501	53513	53502	53495	53502
23	53509	53513	53522	53495	53497	53500	53494	53500	53503	53508	53512	53497	53499	53501	53508
25	53527	53519	53516	53498	53494	53499	53495	53500	53501	53513	53501	53497	53503	53506	53511
30	53516	53520	53495	53495	53500	53501	53496	53500	53503	53499	53514	53513	53502	53516	53515
40	53526	53517	53518	53496	53495	53500	53488	53500	53503	53499	53505	53515	53502	53506	53514

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	53503 bytes	–	100%
1,000	53499 bytes	-4 bytes	100%
10,000	53492 bytes	-7 bytes	100%
100,000	53487 bytes	-5 bytes	1.16%
1,000,000	53483 bytes	-4 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)	53663 bytes	+180 bytes (+0.34%)	+89 bytes
1	53574 bytes	+91 bytes (+0.17%)	–
2	53601 bytes	+118 bytes (+0.22%)	+27 bytes
3	53636 bytes	+153 bytes (+0.29%)	+62 bytes
4	53666 bytes	+183 bytes (+0.34%)	+92 bytes
5	53687 bytes	+204 bytes (+0.38%)	+113 bytes
6	53730 bytes	+247 bytes (+0.46%)	+156 bytes
7	53739 bytes	+256 bytes (+0.48%)	+165 bytes
8	53727 bytes	+244 bytes (+0.46%)	+153 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	39270 bytes	-14213 bytes (-26.57%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46932 bytes	-6551 bytes (-12.25%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47847 bytes	-5636 bytes (-10.54%)
Brotli (Wikipedia)	brotli	brotli -q 11	49391 bytes	-4092 bytes (-7.65%)
LZMA2 (Wikipedia)	xz	xz -9	50444 bytes	-3039 bytes (-5.68%)
Zstandard (Wikipedia)	zstd	zstd -19	51799 bytes	-1684 bytes (-3.15%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	52161 bytes	-1322 bytes (-2.47%)

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.