ThreeJS 60 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 814534 bytes (795.4k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 411282 bytes (401.6k, 50%).

After GZIP compression these minified files vary in size:

Boot	119519 bytes (116.7k)	CDN
cdnjs	99686 bytes (97.3k)	CDN
gzip -6 (default)	98744 bytes (96.4k)	local copy
gzip -9	98341 bytes (96.0k)	local copy
libdeflate -12	95068 bytes (92.8k)	local copy
zultra	95012 bytes (92.8k)	local copy
7zip -mx=9 -tgzip	94966 bytes (92.7k)	local copy
pigz -11 -n	94611 bytes (92.4k)	local copy
kzip -s0 -rn -b0	94554 bytes (92.3k)	local copy
Zopfli	94512 bytes (92.3k)	local copy
Zopfli (defluff)	94511 bytes (92.3k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/threejs/three-r60.min.js (or via HTTPS)

You will automatically get the smallest ThreeJS 60 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 5174 bytes by using my ThreeJS 60 Zopfli version instead of the best available CDN (5.47% smaller than cdnjs, 94512 vs. 99686 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 --mls2048 --bsr12 --lazy --ohh

(found February 8, 2017)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	2048	--mls2048
block splitting recursion	12	--bsr12
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 (94511 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/r60/build/three.min.js --location | md5sum
364d29a51474763d59239f487ecbf387 -
curl --silent --compressed https://minime.stephan-brumme.com/files/threejs/three-r60.min.zopfli.js.gz | md5sum
364d29a51474763d59239f487ecbf387 -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/mrdoob/three.js/r60/build/three.min.js --location | sha1sum
76cd0f2dabb330407ea3bbcaa93b579b0b1e55c0 -
curl --silent --compressed https://minime.stephan-brumme.com/files/threejs/three-r60.min.zopfli.js.gz | sha1sum
76cd0f2dabb330407ea3bbcaa93b579b0b1e55c0 -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	119519 bytes	364d29a51474763d59239f487ecbf387	(invalid)
cdnjs	99686 bytes	364d29a51474763d59239f487ecbf387	(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
94512 bytes	-4 bytes	zopfli --i1000000 --mls2048 --bsr12 --lazy --ohh	February 8, 2017 @ 05:31
94516 bytes	-9 bytes	zopfli --i100000 --mls2048 --bsr12 --lazy --ohh	December 28, 2015 @ 19:26
94525 bytes	-13 bytes	zopfli --i10000 --mls2048 --bsr12 --lazy --ohh	November 17, 2015 @ 13:30
94538 bytes	-30 bytes	zopfli --i1000 --mls2048 --bsr12 --lazy --ohh	November 16, 2015 @ 17:17
94568 bytes	–	zopfli --i100 --mls2048 --bsr12 --lazy --ohh	November 15, 2015 @ 11:21

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 @ 12:51.

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	94692	94655	94652	94802	94697	94685	94676	94690	94678	94687	94595	94614	94647	94646	94689
4	94641	94640	94628	94628	94626	94593	94667	94632	94640	94637	94640	94804	94617	94699	94657
6	94719	94628	94682	94696	94754	94759	94629	94654	94556	94560	94606	94674	94602	94557	94669
7	94691	94625	94623	94610	94670	94606	94630	94671	94720	94675	94632	94546	94620	94590	94647
8	94746	94714	94616	94765	94683	94690	94684	94608	94626	94612	94630	94618	94604	94634	94628
9	94715	94622	94615	94714	94624	94619	94607	94600	94626	94617	94620	94663	94569	94626	94635
10	94719	94620	94634	94690	94619	94610	94608	94603	94611	94624	94651	94658	94599	94661	94627
11	94724	94724	94618	94622	94673	94623	94663	94610	94624	94639	94637	94661	94606	94672	94722
12	94728	94610	94617	94678	94605	94608	94617	94607	94622	94620	94512	94659	94658	94619	94723
13	94725	94722	94650	94676	94629	94660	94681	94600	94606	94609	94607	94661	94615	94656	94710
14	94724	94728	94630	94627	94604	94619	94620	94620	94623	94618	94667	94664	94665	94669	94692
15	94693	94627	94622	94637	94611	94663	94660	94667	94606	94679	94636	94665	94644	94607	94649
16	94714	94709	94624	94676	94605	94662	94687	94611	94603	94660	94575	94657	94608	94658	94644
17	94628	94630	94620	94620	94607	94628	94616	94664	94680	94617	94608	94667	94600	94666	94639
18	94691	94628	94669	94670	94668	94668	94604	94615	94604	94635	94612	94664	94691	94663	94722
19	94730	94719	94625	94725	94604	94667	94619	94605	94603	94681	94606	94659	94610	94664	94730
20	94724	94721	94615	94677	94670	94672	94617	94664	94662	94619	94605	94575	94607	94669	94737
21	94706	94737	94683	94795	94788	94666	94671	94602	94613	94667	94606	94603	94596	94700	94637
22	94835	94734	94728	94732	94716	94775	94669	94622	94621	94633	94575	94575	94595	94674	94656
23	94726	94726	94609	94609	94626	94688	94605	94621	94621	94536	94586	94655	94602	94668	94723
25	94734	94628	94622	94658	94669	94622	94620	94666	94669	94621	94586	94652	94697	94673	94721
30	94728	94729	94625	94674	94675	94669	94618	94604	94603	94619	94617	94662	94588	94629	94736
40	94724	94729	94623	94619	94674	94666	94621	94609	94606	94675	94635	94661	94610	94669	94726

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	94568 bytes	–	100%
1,000	94538 bytes	-30 bytes	100%
10,000	94525 bytes	-13 bytes	100%
100,000	94516 bytes	-9 bytes	0.58%
1,000,000	94512 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)	94554 bytes	+42 bytes (+0.04%)	–
1	95054 bytes	+542 bytes (+0.57%)	+500 bytes
2	94945 bytes	+433 bytes (+0.46%)	+391 bytes
3	94936 bytes	+424 bytes (+0.45%)	+382 bytes
4	94833 bytes	+321 bytes (+0.34%)	+279 bytes
5	94775 bytes	+263 bytes (+0.28%)	+221 bytes
6	94794 bytes	+282 bytes (+0.30%)	+240 bytes
7	94679 bytes	+167 bytes (+0.18%)	+125 bytes
8	94672 bytes	+160 bytes (+0.17%)	+118 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	64694 bytes	-29818 bytes (-31.55%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	74553 bytes	-19959 bytes (-21.12%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	79587 bytes	-14925 bytes (-15.79%)
Brotli (Wikipedia)	brotli	brotli -q 11	80613 bytes	-13899 bytes (-14.71%)
LZMA2 (Wikipedia)	xz	xz -9	81212 bytes	-13300 bytes (-14.07%)
Zstandard (Wikipedia)	zstd	zstd -19	86401 bytes	-8111 bytes (-8.58%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	86995 bytes	-7517 bytes (-7.95%)

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.