ThreeJS 91 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 1079038 bytes (1,053.7k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 534113 bytes (521.6k, 49%).

After GZIP compression these minified files vary in size:

cdnjs	134927 bytes (131.8k)	CDN
unpkg	134927 bytes (131.8k)	CDN
gzip -6 (default)	134662 bytes (131.5k)	local copy
jsdelivr	134551 bytes (131.4k)	CDN
gzip -9	134225 bytes (131.1k)	local copy
libdeflate -12	129655 bytes (126.6k)	local copy
7zip -mx=9 -tgzip	129643 bytes (126.6k)	local copy
zultra	129439 bytes (126.4k)	local copy
kzip -s0 -rn -b8	129265 bytes (126.2k)	local copy
pigz -11 -n	129204 bytes (126.2k)	local copy
Zopfli	129106 bytes (126.1k)	local copy
Zopfli (defluff)	129102 bytes (126.1k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/threejs/three-r91.min.js (or via HTTPS)

You will automatically get the smallest ThreeJS 91 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 5445 bytes by using my ThreeJS 91 Zopfli version instead of the best available CDN (4.22% smaller than jsdelivr, 129106 vs. 134551 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 --mls4096 --bsr22 --lazy --ohh

(found March 16, 2018)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	4096	--mls4096
block splitting recursion	22	--bsr22
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 4 more bytes (129102 bytes).

Download

Verify file integrity

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

MD5:
curl --silent --compressed https://raw.githubusercontent.com/mrdoob/three.js/r91/build/three.min.js --location | md5sum
dbc882ea9757ed00f9c4bdbfaef851af -
curl --silent --compressed https://minime.stephan-brumme.com/files/threejs/three-r91.min.zopfli.js.gz | md5sum
dbc882ea9757ed00f9c4bdbfaef851af -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/mrdoob/three.js/r91/build/three.min.js --location | sha1sum
ea56013a6a2757856bd7a08025d531feebe34063 -
curl --silent --compressed https://minime.stephan-brumme.com/files/threejs/three-r91.min.zopfli.js.gz | sha1sum
ea56013a6a2757856bd7a08025d531feebe34063 -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
cdnjs	134927 bytes	dbc882ea9757ed00f9c4bdbfaef851af	(invalid)
unpkg	134927 bytes	dbc882ea9757ed00f9c4bdbfaef851af	(invalid)
jsdelivr	134551 bytes	dbc882ea9757ed00f9c4bdbfaef851af	(invalid)

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

Other Versions

Available ThreeJS versions at minime.stephan-brumme.com:

148, 147, 146, 145, 144, 143, 142, 141, 140, 139, 138, 137, 136, 135, 134, 133, 132, 131, 130, 129, 128, 127, 126, 125, 124, 123, 122, 121, 120, 119, 118, 117, 116, 115, 114, 113, 112, 111, 110, 109, 108, 107, 106, 105, 104, 103, 102, 101, 100, 99, 98, 97, 96, 95, 94, 93, 92, 91, 90, 89, 88, 87, 86, 85, 84, 83, 82, 81, 80, 79, 78, 77, 76, 75, 74, 73, 72, 71, 70, 69, 68, 67, 66, 65, 64, 63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50

The project site contains an overview how well these versions were compressed.
Other interesting projects are AngularJS, BackboneJS, Bootstrap, D3, Dojo, Ember, jQuery, Knockout, lodash, React, Socket.IO, UnderscoreJS and Vue.

Changelog

Best Zopfli parameters so far:

Size	Improvement	Parameters	Found
129106 bytes	-5 bytes	zopfli --i1000000 --mls4096 --bsr22 --lazy --ohh	March 16, 2018 @ 19:22
129111 bytes	-6 bytes	zopfli --i100000 --mls4096 --bsr22 --lazy --ohh	March 15, 2018 @ 16:26
129117 bytes	-1 byte	zopfli --i10000 --mls4096 --bsr22 --lazy --ohh	March 15, 2018 @ 13:05
129118 bytes	-12 bytes	zopfli --i10000 --mls4096 --bsr18 --lazy --ohh	March 15, 2018 @ 12:48
129130 bytes	-20 bytes	zopfli --i1000 --mls4096 --bsr18 --lazy --ohh	March 15, 2018 @ 11:51
129150 bytes	–	zopfli --i100 --mls4096 --bsr22 --lazy --ohh	March 15, 2018 @ 11:25

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 @ 12:50.

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	129311	129290	129379	129446	129438	129271	129242	129300	129226	129234	129212	129215	129208	129441	129188
4	129407	129407	129354	129395	129376	129353	129380	129159	129175	129401	129360	129146	129386	129253	129396
6	129374	129383	129358	129357	129364	129347	129373	129375	129374	129377	129310	129347	129238	129254	129239
7	129324	129331	129365	129370	129346	129352	129381	129338	129379	129328	129373	129120	129244	129261	129244
8	129330	129344	129345	129321	129351	129348	129242	129215	129373	129370	129189	129203	129387	129150	129339
9	129205	129324	129345	129371	129359	129322	129393	129143	129176	129378	129329	129334	129240	129248	129207
10	129223	129365	129353	129338	129312	129367	129365	129378	129373	129260	129145	129217	129377	129351	129336
11	129198	129200	129335	129318	129342	129362	129365	129158	129371	129360	129375	129351	129243	129199	129193
12	129365	129158	129337	129321	129337	129344	129373	129365	129374	129380	129365	129199	129370	129226	129185
13	129197	129185	129335	129335	129397	129340	129356	129161	129351	129377	129369	129216	129375	129397	129186
14	129312	129355	129334	129326	129350	129361	129247	129173	129300	129407	129348	129190	129245	129238	129250
15	129230	129319	129337	129331	129314	129369	129342	129359	129368	129222	129348	129245	129244	129209	129254
16	129312	129343	129338	129338	129329	129341	129341	129349	129350	129239	129188	129175	129239	129245	129213
17	129373	129370	129341	129346	129351	129358	129413	129358	129376	129395	129356	129221	129234	129187	129172
18	129348	129359	129341	129318	129330	129353	129405	129146	129354	129213	129328	129114	129137	129180	129319
19	129352	129365	129332	129336	129338	129332	129341	129173	129200	129362	129338	129375	129234	129393	129324
20	129329	129363	129336	129335	129349	129372	129368	129223	129145	129375	129363	129159	129370	129204	129409
21	129330	129144	129346	129358	129353	129349	129332	129348	129356	129362	129368	129355	129239	129368	129313
22	129358	129332	129336	129334	129332	129368	129376	129170	129168	129377	129355	129106	129241	129363	129317
23	129215	129210	129336	129334	129334	129366	129335	129364	129364	129365	129372	129188	129235	129392	129330
25	129218	129221	129169	129320	129319	129343	129358	129357	129221	129362	129350	129359	129240	129356	129345
30	129314	129160	129338	129355	129314	129356	129369	129173	129147	129363	129366	129162	129375	129395	129337
40	129223	129181	129340	129336	129348	129348	129344	129354	129355	129380	129368	129360	129239	129184	129336

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	129150 bytes	–	100%
1,000	129130 bytes	-20 bytes	100%
10,000	129117 bytes	-13 bytes	100%
100,000	129111 bytes	-6 bytes	0.58%
1,000,000	129106 bytes	-5 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)	129301 bytes	+195 bytes (+0.15%)	+36 bytes
1	129850 bytes	+744 bytes (+0.58%)	+585 bytes
2	129848 bytes	+742 bytes (+0.57%)	+583 bytes
3	129651 bytes	+545 bytes (+0.42%)	+386 bytes
4	129571 bytes	+465 bytes (+0.36%)	+306 bytes
5	129474 bytes	+368 bytes (+0.29%)	+209 bytes
6	129426 bytes	+320 bytes (+0.25%)	+161 bytes
7	129306 bytes	+200 bytes (+0.15%)	+41 bytes
8	129265 bytes	+159 bytes (+0.12%)	–

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	86778 bytes	-42328 bytes (-32.79%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	99913 bytes	-29193 bytes (-22.61%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	103759 bytes	-25347 bytes (-19.63%)
Brotli (Wikipedia)	brotli	brotli -q 11	109696 bytes	-19410 bytes (-15.03%)
LZMA2 (Wikipedia)	xz	xz -9	110540 bytes	-18566 bytes (-14.38%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	114708 bytes	-14398 bytes (-11.15%)
Zstandard (Wikipedia)	zstd	zstd -19	117012 bytes	-12094 bytes (-9.37%)

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 2025.
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.