ThreeJS 72 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 797039 bytes (778.4k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 423927 bytes (414.0k, 53%).

After GZIP compression these minified files vary in size:

Boot	121856 bytes (119.0k)	CDN
cdnjs	100644 bytes (98.3k)	CDN
unpkg	100348 bytes (98.0k)	CDN
gzip -6 (default)	99584 bytes (97.3k)	local copy
Google	99536 bytes (97.2k)	CDN
gzip -9	99185 bytes (96.9k)	local copy
jsdelivr	99112 bytes (96.8k)	CDN
zultra	95749 bytes (93.5k)	local copy
libdeflate -12	95740 bytes (93.5k)	local copy
7zip -mx=9 -tgzip	95690 bytes (93.4k)	local copy
pigz -11 -n	95482 bytes (93.2k)	local copy
kzip -s0 -rn -b8	95410 bytes (93.2k)	local copy
Zopfli	95293 bytes (93.1k)	local copy
Zopfli (defluff)	95290 bytes (93.1k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/threejs/three-r72.min.js (or via HTTPS)

You will automatically get the smallest ThreeJS 72 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 3819 bytes by using my ThreeJS 72 Zopfli version instead of the best available CDN (4.01% smaller than jsdelivr, 95293 vs. 99112 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 --bsr19 --lazy --ohh

(found January 28, 2017)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	8192	--mls8192
block splitting recursion	19	--bsr19
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 (95290 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/r72/build/three.min.js --location | md5sum
130f3f943b1dffc0c682ecea913c92ba -
curl --silent --compressed https://minime.stephan-brumme.com/files/threejs/three-r72.min.zopfli.js.gz | md5sum
130f3f943b1dffc0c682ecea913c92ba -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/mrdoob/three.js/r72/build/three.min.js --location | sha1sum
6d8864f9fedc450445de4da4c7e7131890902f5e -
curl --silent --compressed https://minime.stephan-brumme.com/files/threejs/three-r72.min.zopfli.js.gz | sha1sum
6d8864f9fedc450445de4da4c7e7131890902f5e -

These CDNs send you the original file:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Google	99536 bytes	130f3f943b1dffc0c682ecea913c92ba	(invalid)

And some CDNs send you a different file:

CDN	Size (compressed)	MD5 (uncompressed)	Comment / Diff	Timestamp
Boot	121856 bytes	1300b77eb565fce296ea5c3738fe45fb	< this.matrix),this.matrixWorldNeedsUpdate=!1,a=!0;for(var b [...] < (d.userData=this.userData);!0!==this.visible&&(d.visible=t [...] < b&&(b=!0);this.name=a.name;this.up.copy(a.up);this.positio [...] < JSON.parse(JSON.stringify(a.userData));if(!0===b)for(var c [...] > this.matrix),this.matrixWorldNeedsUpdate=!1,a=!0;for(var b [...] > this.userData);!0!==this.visible&&(d.visible=this.visible) [...] > b){void 0===b&&(b=!0);this.name=a.name;this.up.copy(a.up); [...] > this.userData=JSON.parse(JSON.stringify(a.userData));if(!0 [...] < c))):"index"===a?(console.warn("THREE.BufferGeometry.addAt [...] > c))):("index"===a&&(console.warn("THREE.BufferGeometry.add [...] [...]	(invalid)
cdnjs	100644 bytes	1300b77eb565fce296ea5c3738fe45fb	< this.matrix),this.matrixWorldNeedsUpdate=!1,a=!0;for(var b [...] < (d.userData=this.userData);!0!==this.visible&&(d.visible=t [...] < b&&(b=!0);this.name=a.name;this.up.copy(a.up);this.positio [...] < JSON.parse(JSON.stringify(a.userData));if(!0===b)for(var c [...] > this.matrix),this.matrixWorldNeedsUpdate=!1,a=!0;for(var b [...] > this.userData);!0!==this.visible&&(d.visible=this.visible) [...] > b){void 0===b&&(b=!0);this.name=a.name;this.up.copy(a.up); [...] > this.userData=JSON.parse(JSON.stringify(a.userData));if(!0 [...] < c))):"index"===a?(console.warn("THREE.BufferGeometry.addAt [...] > c))):("index"===a&&(console.warn("THREE.BufferGeometry.add [...] [...]	(invalid)
unpkg	100348 bytes	5228a0bfdc6b150c4ba8c125d105cfec	< // threejs.org/license > var self = self \|\| {};// threejs.org/license < this.matrix),this.matrixWorldNeedsUpdate=!1,a=!0;for(var b [...] < (d.userData=this.userData);!0!==this.visible&&(d.visible=t [...] < b&&(b=!0);this.name=a.name;this.up.copy(a.up);this.positio [...] < JSON.parse(JSON.stringify(a.userData));if(!0===b)for(var c [...] > this.matrix),this.matrixWorldNeedsUpdate=!1,a=!0;for(var b [...] > this.userData);!0!==this.visible&&(d.visible=this.visible) [...] > b){void 0===b&&(b=!0);this.name=a.name;this.up.copy(a.up); [...] > this.userData=JSON.parse(JSON.stringify(a.userData));if(!0 [...] [...]	July 11, 2016 @ 15:49
jsdelivr	99112 bytes	9558e2393dff47f1a318e3dc26b2ae59	< this.matrix),this.matrixWorldNeedsUpdate=!1,a=!0;for(var b [...] < (d.userData=this.userData);!0!==this.visible&&(d.visible=t [...] < b&&(b=!0);this.name=a.name;this.up.copy(a.up);this.positio [...] < JSON.parse(JSON.stringify(a.userData));if(!0===b)for(var c [...] > this.matrix),this.matrixWorldNeedsUpdate=!1,a=!0;for(var b [...] > this.userData);!0!==this.visible&&(d.visible=this.visible) [...] > b){void 0===b&&(b=!0);this.name=a.name;this.up.copy(a.up); [...] > this.userData=JSON.parse(JSON.stringify(a.userData));if(!0 [...] < c))):"index"===a?(console.warn("THREE.BufferGeometry.addAt [...] > c))):("index"===a&&(console.warn("THREE.BufferGeometry.add [...] [...]	(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
95293 bytes	-3 bytes	zopfli --i1000000 --mls8192 --bsr19 --lazy --ohh	January 28, 2017 @ 13:24
95296 bytes	-3 bytes	zopfli --i100000 --mls8192 --bsr19 --lazy --ohh	November 14, 2015 @ 11:04
95299 bytes	-5 bytes	zopfli --i10000 --mls8192 --bsr19 --lazy --ohh	November 14, 2015 @ 01:48
95304 bytes	-13 bytes	zopfli --i10000 --mls64 --bsr19 --lazy --ohh	November 14, 2015 @ 01:31
95317 bytes	-24 bytes	zopfli --i1000 --mls64 --bsr19 --lazy --ohh	November 14, 2015 @ 01:11
95341 bytes	–	zopfli --i100 --mls8192 --bsr19 --lazy --ohh	November 14, 2015 @ 00:14

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	95478	95451	95498	95497	95482	95487	95494	95463	95470	95514	95531	95589	95443	95525	95539
4	95499	95513	95430	95491	95478	95478	95517	95480	95525	95382	95397	95476	95431	95479	95506
6	95453	95419	95451	95435	95417	95453	95462	95452	95454	95370	95491	95387	95403	95464	95476
7	95447	95445	95417	95468	95468	95457	95445	95427	95487	95374	95493	95481	95443	95346	95486
8	95457	95465	95453	95398	95403	95332	95429	95453	95495	95399	95452	95323	95482	95378	95366
9	95445	95444	95410	95448	95407	95407	95424	95449	95454	95442	95454	95483	95458	95467	95497
10	95399	95454	95400	95421	95449	95409	95434	95416	95450	95444	95441	95460	95453	95457	95501
11	95498	95504	95416	95394	95410	95485	95483	95430	95484	95443	95483	95483	95502	95478	95494
12	95445	95412	95411	95437	95417	95439	95445	95471	95466	95440	95442	95472	95466	95495	95503
13	95510	95493	95414	95481	95437	95496	95500	95479	95482	95478	95477	95444	95414	95511	95421
14	95459	95454	95443	95411	95408	95471	95455	95448	95452	95444	95449	95468	95456	95496	95489
15	95442	95461	95417	95451	95484	95460	95458	95450	95497	95502	95445	95462	95404	95488	95486
16	95456	95453	95415	95415	95419	95447	95434	95447	95486	95482	95449	95484	95505	95463	95492
17	95450	95439	95497	95471	95401	95409	95447	95445	95478	95452	95369	95344	95450	95463	95457
18	95568	95411	95402	95446	95565	95488	95478	95315	95444	95364	95487	95455	95432	95455	95501
19	95568	95569	95477	95446	95499	95298	95415	95434	95560	95475	95484	95479	95293	95508	95504
20	95454	95565	95440	95450	95430	95397	95467	95449	95480	95439	95445	95364	95511	95495	95510
21	95491	95449	95420	95407	95470	95443	95445	95454	95450	95446	95451	95488	95455	95496	95509
22	95439	95450	95451	95408	95400	95436	95452	95490	95480	95455	95476	95485	95490	95492	95497
23	95445	95467	95412	95448	95439	95455	95491	95453	95443	95439	95447	95473	95452	95462	95493
25	95423	95488	95421	95408	95406	95403	95449	95440	95446	95473	95453	95495	95452	95489	95498
30	95449	95450	95409	95401	95410	95437	95405	95433	95450	95473	95435	95498	95461	95507	95519
40	95402	95450	95438	95396	95405	95406	95431	95450	95435	95435	95435	95450	95451	95465	95488

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	95341 bytes	–	100%
1,000	95317 bytes	-24 bytes	100%
10,000	95299 bytes	-18 bytes	100%
100,000	95296 bytes	-3 bytes	0.58%
1,000,000	95293 bytes	-3 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)	95434 bytes	+141 bytes (+0.15%)	+24 bytes
1	95848 bytes	+555 bytes (+0.58%)	+438 bytes
2	95767 bytes	+474 bytes (+0.50%)	+357 bytes
3	95699 bytes	+406 bytes (+0.43%)	+289 bytes
4	95673 bytes	+380 bytes (+0.40%)	+263 bytes
5	95614 bytes	+321 bytes (+0.34%)	+204 bytes
6	95605 bytes	+312 bytes (+0.33%)	+195 bytes
7	95485 bytes	+192 bytes (+0.20%)	+75 bytes
8	95410 bytes	+117 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	65520 bytes	-29773 bytes (-31.24%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	75078 bytes	-20215 bytes (-21.21%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	78863 bytes	-16430 bytes (-17.24%)
Brotli (Wikipedia)	brotli	brotli -q 11	82655 bytes	-12638 bytes (-13.26%)
LZMA2 (Wikipedia)	xz	xz -9	83420 bytes	-11873 bytes (-12.46%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	87073 bytes	-8220 bytes (-8.63%)
Zstandard (Wikipedia)	zstd	zstd -19	88338 bytes	-6955 bytes (-7.30%)

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.