ThreeJS 63 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 810421 bytes (791.4k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 409329 bytes (399.7k, 51%).

After GZIP compression these minified files vary in size:

Boot	119171 bytes (116.4k)	CDN
cdnjs	99577 bytes (97.2k)	CDN
gzip -6 (default)	98646 bytes (96.3k)	local copy
gzip -9	98236 bytes (95.9k)	local copy
libdeflate -12	94955 bytes (92.7k)	local copy
zultra	94935 bytes (92.7k)	local copy
7zip -mx=9 -tgzip	94878 bytes (92.7k)	local copy
pigz -11 -n	94505 bytes (92.3k)	local copy
kzip -s0 -rn -b0	94469 bytes (92.3k)	local copy
Zopfli	94437 bytes (92.2k)	local copy
Zopfli (defluff)	94434 bytes (92.2k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/threejs/three-r63.min.js (or via HTTPS)

You will automatically get the smallest ThreeJS 63 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 5140 bytes by using my ThreeJS 63 Zopfli version instead of the best available CDN (5.44% smaller than cdnjs, 94437 vs. 99577 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 --mls1024 --bsr20 --lazy --ohh

(found February 5, 2017)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	1024	--mls1024
block splitting recursion	20	--bsr20
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 3 more bytes (94434 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/r63/build/three.min.js --location | md5sum
f54aa2c5e58f0593effc6a6db008b1ce -
curl --silent --compressed https://minime.stephan-brumme.com/files/threejs/three-r63.min.zopfli.js.gz | md5sum
f54aa2c5e58f0593effc6a6db008b1ce -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/mrdoob/three.js/r63/build/three.min.js --location | sha1sum
aea390a05529a427e83adbacdf2e289410032973 -
curl --silent --compressed https://minime.stephan-brumme.com/files/threejs/three-r63.min.zopfli.js.gz | sha1sum
aea390a05529a427e83adbacdf2e289410032973 -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	119171 bytes	f54aa2c5e58f0593effc6a6db008b1ce	(invalid)
cdnjs	99577 bytes	f54aa2c5e58f0593effc6a6db008b1ce	(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
94437 bytes	-1 byte	zopfli --i1000000 --mls1024 --bsr20 --lazy --ohh	February 5, 2017 @ 08:52
94438 bytes	-1 byte	zopfli --i100000 --mls1024 --bsr20 --lazy --ohh	December 28, 2015 @ 22:07
94439 bytes	-5 bytes	zopfli --i100000 --mls4096 --bsr7 --lazy --ohh	December 28, 2015 @ 20:29
94444 bytes	-4 bytes	zopfli --i10000 --mls4096 --bsr7 --lazy --ohh	November 17, 2015 @ 04:02
94448 bytes	-4 bytes	zopfli --i10000 --mls1024 --bsr23 --lazy --ohh	November 17, 2015 @ 02:07
94452 bytes	-30 bytes	zopfli --i1000 --mls1024 --bsr20 --lazy --ohh	November 16, 2015 @ 17:21
94482 bytes	–	zopfli --i100 --mls1024 --bsr20 --lazy --ohh	November 15, 2015 @ 10:12

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 @ 12:48.

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	94727	94622	94611	94562	94609	94572	94574	94629	94568	94592	94559	94571	94606	94603	94589
4	94550	94554	94588	94560	94584	94540	94549	94546	94497	94455	94525	94739	94548	94598	94552
6	94652	94646	94619	94596	94670	94540	94549	94549	94547	94450	94721	94736	94555	94606	94724
7	94639	94648	94638	94655	94586	94548	94553	94494	94652	94494	94459	94439	94553	94583	94582
8	94673	94587	94711	94639	94545	94544	94602	94539	94478	94559	94516	94502	94559	94548	94559
9	94641	94628	94710	94554	94664	94644	94546	94543	94688	94550	94511	94485	94560	94548	94518
10	94594	94640	94614	94641	94651	94657	94652	94634	94476	94490	94560	94550	94542	94582	94542
11	94601	94704	94717	94722	94601	94654	94538	94624	94545	94537	94524	94493	94541	94602	94553
12	94603	94539	94598	94606	94597	94540	94555	94534	94538	94640	94568	94451	94547	94603	94562
13	94638	94641	94633	94628	94540	94603	94607	94601	94607	94599	94511	94452	94537	94593	94575
14	94633	94600	94637	94596	94609	94603	94542	94537	94607	94536	94567	94442	94536	94551	94565
15	94627	94594	94592	94592	94570	94547	94538	94536	94545	94535	94556	94454	94541	94577	94579
16	94637	94590	94597	94581	94527	94598	94606	94534	94657	94538	94564	94482	94535	94551	94539
17	94634	94640	94652	94621	94593	94609	94544	94535	94635	94601	94553	94452	94535	94577	94545
18	94590	94635	94528	94536	94528	94538	94545	94533	94540	94537	94514	94450	94538	94593	94565
19	94613	94641	94596	94588	94527	94661	94590	94603	94619	94559	94512	94486	94541	94596	94548
20	94633	94583	94628	94714	94644	94640	94545	94599	94478	94437	94512	94550	94539	94600	94564
21	94634	94634	94749	94587	94644	94652	94639	94653	94479	94539	94567	94450	94533	94593	94559
22	94603	94715	94702	94697	94651	94651	94643	94638	94540	94637	94506	94453	94539	94595	94539
23	94635	94547	94705	94622	94528	94656	94544	94593	94542	94444	94560	94451	94533	94556	94549
25	94598	94548	94595	94618	94531	94539	94541	94606	94478	94537	94561	94455	94540	94538	94557
30	94644	94632	94591	94584	94578	94541	94546	94533	94524	94539	94569	94451	94557	94602	94547
40	94636	94630	94596	94623	94539	94743	94679	94537	94526	94539	94565	94451	94527	94592	94553

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	94482 bytes	–	100%
1,000	94452 bytes	-30 bytes	100%
10,000	94444 bytes	-8 bytes	100%
100,000	94438 bytes	-6 bytes	1.16%
1,000,000	94437 bytes	-1 byte	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)	94469 bytes	+32 bytes (+0.03%)	–
1	94970 bytes	+533 bytes (+0.56%)	+501 bytes
2	94874 bytes	+437 bytes (+0.46%)	+405 bytes
3	94848 bytes	+411 bytes (+0.44%)	+379 bytes
4	94733 bytes	+296 bytes (+0.31%)	+264 bytes
5	94703 bytes	+266 bytes (+0.28%)	+234 bytes
6	94596 bytes	+159 bytes (+0.17%)	+127 bytes
7	94586 bytes	+149 bytes (+0.16%)	+117 bytes
8	94492 bytes	+55 bytes (+0.06%)	+23 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	64689 bytes	-29748 bytes (-31.50%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	74252 bytes	-20185 bytes (-21.37%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	79381 bytes	-15056 bytes (-15.94%)
Brotli (Wikipedia)	brotli	brotli -q 11	80526 bytes	-13911 bytes (-14.73%)
LZMA2 (Wikipedia)	xz	xz -9	81124 bytes	-13313 bytes (-14.10%)
Zstandard (Wikipedia)	zstd	zstd -19	86238 bytes	-8199 bytes (-8.68%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	86505 bytes	-7932 bytes (-8.40%)

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.