ThreeJS 147 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 1169314 bytes (1,141.9k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 607784 bytes (593.5k, 52%).

After GZIP compression these minified files vary in size:

unpkg	223616 bytes (218.4k)	CDN
gzip -6 (default)	152835 bytes (149.3k)	local copy
jsdelivr	152721 bytes (149.1k)	CDN
gzip -9	152348 bytes (148.8k)	local copy
libdeflate -12	147035 bytes (143.6k)	local copy
zultra	146728 bytes (143.3k)	local copy
7zip -mx=9 -tgzip	146693 bytes (143.3k)	local copy
kzip -s0 -rn -b0	146411 bytes (143.0k)	local copy
pigz -11 -n	146344 bytes (142.9k)	local copy
Zopfli	146326 bytes (142.9k)	local copy
Zopfli (defluff)	146321 bytes (142.9k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/threejs/three-r147.min.js (or via HTTPS)

You will automatically get the smallest ThreeJS 147 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 6395 bytes by using my ThreeJS 147 Zopfli version instead of the best available CDN (4.37% smaller than jsdelivr, 146326 vs. 152721 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 --bsr10 --lazy --ohh

(found January 10, 2023)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	8192	--mls8192
block splitting recursion	10	--bsr10
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 5 more bytes (146321 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/r147/build/three.min.js --location | md5sum
ac4679b19c6ac6b2827182dc0c988471 -
curl --silent --compressed https://minime.stephan-brumme.com/files/threejs/three-r147.min.zopfli.js.gz | md5sum
ac4679b19c6ac6b2827182dc0c988471 -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/mrdoob/three.js/r147/build/three.min.js --location | sha1sum
912bc7c150055cd324dfee0ff243cab74e7c6606 -
curl --silent --compressed https://minime.stephan-brumme.com/files/threejs/three-r147.min.zopfli.js.gz | sha1sum
912bc7c150055cd324dfee0ff243cab74e7c6606 -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
unpkg	223616 bytes	ac4679b19c6ac6b2827182dc0c988471	(invalid)
jsdelivr	152721 bytes	ac4679b19c6ac6b2827182dc0c988471	January 3, 2023 @ 16:24

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
146326 bytes	-4 bytes	zopfli --i1000000 --mls8192 --bsr10 --lazy --ohh	January 10, 2023 @ 13:16
146330 bytes	-6 bytes	zopfli --i100000 --mls8192 --bsr10 --lazy --ohh	January 7, 2023 @ 00:49
146336 bytes	-1 byte	zopfli --i10000 --mls8192 --bsr10 --lazy --ohh	January 6, 2023 @ 06:46
146337 bytes	-15 bytes	zopfli --i10000 --mls4096 --bsr40 --lazy --ohh	January 5, 2023 @ 02:56
146352 bytes	-7 bytes	zopfli --i1000 --mls4096 --bsr40 --lazy --ohh	January 3, 2023 @ 21:15
146359 bytes	-14 bytes	zopfli --i1000 --mls8192 --bsr10 --lazy --ohh	January 3, 2023 @ 20:08
146373 bytes	–	zopfli --i100 --mls8192 --bsr10 --lazy --ohh	January 3, 2023 @ 17:57

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

Most recent activity on January 10, 2023 @ 13:24.

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 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	146561	146738	146579	146536	146483	146545	146484	146504	146560	146501	146438	146518	146518	146363	146507
4	146478	146518	146520	146496	146474	146506	146454	146437	146452	146467	146450	146346	146468	146355	146509
6	146445	146442	146438	146469	146438	146455	146431	146427	146433	146433	146349	146470	146473	146432	146499
7	146444	146434	146467	146444	146461	146427	146612	146431	146434	146437	146429	146451	146437	146427	146514
8	146473	146446	146430	146451	146499	146440	146471	146437	146438	146457	146416	146466	146432	146478	146478
9	146440	146441	146438	146452	146463	146430	146467	146429	146419	146424	146452	146449	146432	146465	146478
10	146479	146443	146487	146447	146506	146503	146587	146498	146419	146429	146419	146432	146326	146361	146469
11	146445	146443	146447	146433	146443	146429	146428	146434	146417	146437	146435	146430	146471	146451	146447
12	146429	146444	146443	146431	146447	146435	146435	146421	146421	146429	146431	146420	146438	146431	146475
13	146449	146476	146438	146439	146444	146448	146428	146438	146433	146442	146413	146449	146434	146430	146435
14	146437	146447	146458	146436	146435	146428	146433	146428	146428	146419	146416	146429	146443	146460	146448
15	146443	146445	146460	146438	146443	146425	146428	146437	146414	146432	146427	146430	146467	146464	146455
16	146436	146439	146452	146460	146454	146443	146454	146432	146420	146433	146415	146440	146447	146436	146496
17	146441	146442	146447	146423	146443	146443	146445	146442	146418	146427	146422	146476	146459	146463	146455
18	146469	146442	146461	146448	146464	146451	146433	146432	146434	146445	146416	146470	146447	146465	146491
19	146452	146443	146444	146444	146431	146434	146437	146427	146424	146442	146415	146418	146443	146467	146467
20	146433	146424	146445	146443	146426	146443	146434	146430	146425	146424	146407	146465	146460	146447	146448
21	146441	146442	146446	146459	146438	146442	146435	146428	146421	146429	146414	146429	146442	146434	146487
22	146448	146444	146446	146462	146460	146456	146430	146438	146422	146430	146410	146459	146422	146467	146441
23	146450	146447	146433	146444	146439	146442	146430	146431	146416	146426	146411	146471	146457	146523	146441
25	146429	146445	146442	146442	146441	146441	146429	146429	146419	146436	146415	146435	146464	146470	146448
30	146439	146442	146427	146458	146436	146462	146438	146431	146417	146437	146416	146465	146448	146433	146449
40	146430	146445	146456	146454	146431	146456	146439	146429	146427	146433	146411	146337	146445	146413	146448

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	146373 bytes	–	100%
1,000	146352 bytes	-21 bytes	100%
10,000	146336 bytes	-16 bytes	100%
100,000	146330 bytes	-6 bytes	0.29%
1,000,000	146326 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)	146411 bytes	+85 bytes (+0.06%)	–
1	147131 bytes	+805 bytes (+0.55%)	+720 bytes
2	147062 bytes	+736 bytes (+0.50%)	+651 bytes
3	146777 bytes	+451 bytes (+0.31%)	+366 bytes
4	146773 bytes	+447 bytes (+0.31%)	+362 bytes
5	146775 bytes	+449 bytes (+0.31%)	+364 bytes
6	146656 bytes	+330 bytes (+0.23%)	+245 bytes
7	146680 bytes	+354 bytes (+0.24%)	+269 bytes
8	146486 bytes	+160 bytes (+0.11%)	+75 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	99581 bytes	-46745 bytes (-31.95%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	118181 bytes	-28145 bytes (-19.23%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	118630 bytes	-27696 bytes (-18.93%)
Brotli (Wikipedia)	brotli	brotli -q 11	124439 bytes	-21887 bytes (-14.96%)
LZMA2 (Wikipedia)	xz	xz -9	124908 bytes	-21418 bytes (-14.64%)
Zstandard (Wikipedia)	zstd	zstd -19	131435 bytes	-14891 bytes (-10.18%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	132399 bytes	-13927 bytes (-9.52%)

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.