ThreeJS 121 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 1228362 bytes (1,199.6k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 646271 bytes (631.1k, 53%).

After GZIP compression these minified files vary in size:

unpkg	193317 bytes (188.8k)	CDN
Boot	158168 bytes (154.5k)	CDN
gzip -6 (default)	157638 bytes (153.9k)	local copy
jsdelivr	157517 bytes (153.8k)	CDN
gzip -9	157061 bytes (153.4k)	local copy
libdeflate -12	151710 bytes (148.2k)	local copy
7zip -mx=9 -tgzip	151609 bytes (148.1k)	local copy
zultra	151382 bytes (147.8k)	local copy
kzip -s0 -rn -b0	151308 bytes (147.8k)	local copy
Zopfli	151151 bytes (147.6k)	local copy
pigz -11 -n	151115 bytes (147.6k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/threejs/three-r121.min.js (or via HTTPS)

You will automatically get the smallest ThreeJS 121 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 6366 bytes by using my ThreeJS 121 Zopfli version instead of the best available CDN (4.21% smaller than jsdelivr, 151151 vs. 157517 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 --mls32768 --bsr15 --lazy --ohh

(found October 9, 2020)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	32768	--mls32768
block splitting recursion	15	--bsr15
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 (151148 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/r121/build/three.min.js --location | md5sum
765bf633ade83f80888c1921d51701db -
curl --silent --compressed https://minime.stephan-brumme.com/files/threejs/three-r121.min.zopfli.js.gz | md5sum
765bf633ade83f80888c1921d51701db -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/mrdoob/three.js/r121/build/three.min.js --location | sha1sum
66ae6d37af608cd38af08607d122b6ae3ef7f3b1 -
curl --silent --compressed https://minime.stephan-brumme.com/files/threejs/three-r121.min.zopfli.js.gz | sha1sum
66ae6d37af608cd38af08607d122b6ae3ef7f3b1 -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
unpkg	193317 bytes	765bf633ade83f80888c1921d51701db	(invalid)
Boot	158168 bytes	765bf633ade83f80888c1921d51701db	(invalid)
jsdelivr	157517 bytes	765bf633ade83f80888c1921d51701db	October 6, 2020 @ 16:21

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
151151 bytes	-4 bytes	zopfli --i1000000 --mls32768 --bsr15 --lazy --ohh	October 9, 2020 @ 18:03
151155 bytes	-7 bytes	zopfli --i100000 --mls32768 --bsr15 --lazy --ohh	October 8, 2020 @ 15:52
151162 bytes	-6 bytes	zopfli --i10000 --mls32768 --bsr15 --lazy --ohh	October 6, 2020 @ 22:28
151168 bytes	-52 bytes	zopfli --i1000 --mls32768 --bsr15 --lazy --ohh	October 6, 2020 @ 17:00
151220 bytes	–	zopfli --i100 --mls32768 --bsr15 --lazy --ohh	October 6, 2020 @ 16:43

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

Most recent activity on October 12, 2020 @ 13:08.

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	151310	151311	151378	151374	151367	151361	151357	151236	151242	151308	151335	151360	151310	151307	151370
4	151425	151426	151430	151432	151417	151395	151459	151395	151299	151464	151276	151300	151357	151260	151315
6	151301	151443	151447	151294	151428	151300	151301	151241	151241	151309	151263	151262	151263	151257	151272
7	151442	151435	151448	151291	151423	151294	151297	151294	151255	151304	151284	151249	151415	151259	151274
8	151418	151282	151439	151442	151327	151288	151285	151278	151296	151287	151251	151279	151252	151263	151267
9	151457	151426	151452	151459	151428	151293	151432	151226	151290	151283	151261	151278	151254	151239	151258
10	151299	151431	151436	151446	151445	151307	151302	151225	151294	151251	151249	151254	151294	151256	151273
11	151438	151312	151446	151448	151425	151416	151420	151408	151413	151289	151262	151249	151284	151272	151296
12	151445	151446	151445	151296	151435	151430	151296	151280	151406	151283	151295	151399	151286	151257	151249
13	151452	151442	151447	151431	151441	151299	151299	151300	151292	151279	151261	151282	151289	151259	151250
14	151462	151338	151339	151462	151282	151263	151264	151267	151264	151306	151266	151264	151252	151241	151261
15	151303	151434	151447	151436	151434	151295	151276	151276	151269	151293	151253	151277	151268	151257	151151
16	151450	151438	151431	151437	151437	151397	151285	151244	151299	151242	151304	151260	151237	151262	151268
17	151440	151453	151447	151458	151431	151423	151300	151290	151415	151379	151253	151270	151254	151265	151263
18	151435	151460	151434	151443	151433	151428	151293	151233	151401	151367	151303	151258	151244	151276	151259
19	151445	151433	151456	151444	151436	151401	151407	151238	151304	151365	151252	151253	151266	151273	151265
20	151417	151273	151451	151430	151435	151405	151383	151294	151245	151282	151248	151270	151259	151274	151248
21	151404	151408	151454	151459	151434	151298	151409	151256	151249	151252	151236	151242	151239	151260	151268
22	151434	151441	151432	151443	151436	151412	151411	151262	151262	151256	151261	151251	151258	151262	151264
23	151430	151437	151437	151436	151439	151415	151412	151249	151266	151242	151253	151246	151240	151269	151265
25	151435	151413	151449	151465	151424	151402	151412	151295	151300	151310	151251	151239	151269	151295	151266
30	151439	151458	151449	151430	151431	151394	151405	151292	151253	151279	151247	151269	151248	151264	151279
40	151472	151451	151418	151460	151438	151397	151406	151278	151257	151283	151256	151283	151255	151257	151269

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	151220 bytes	–	100%
1,000	151168 bytes	-52 bytes	100%
10,000	151162 bytes	-6 bytes	100%
100,000	151155 bytes	-7 bytes	0.87%
1,000,000	151151 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)	151308 bytes	+157 bytes (+0.10%)	–
1	151732 bytes	+581 bytes (+0.38%)	+424 bytes
2	151747 bytes	+596 bytes (+0.39%)	+439 bytes
3	151493 bytes	+342 bytes (+0.23%)	+185 bytes
4	151459 bytes	+308 bytes (+0.20%)	+151 bytes
5	151453 bytes	+302 bytes (+0.20%)	+145 bytes
6	151401 bytes	+250 bytes (+0.17%)	+93 bytes
7	151393 bytes	+242 bytes (+0.16%)	+85 bytes
8	151410 bytes	+259 bytes (+0.17%)	+102 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	102031 bytes	-49120 bytes (-32.50%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	117604 bytes	-33547 bytes (-22.19%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	121868 bytes	-29283 bytes (-19.37%)
Brotli (Wikipedia)	brotli	brotli -q 11	127422 bytes	-23729 bytes (-15.70%)
LZMA2 (Wikipedia)	xz	xz -9	127952 bytes	-23199 bytes (-15.35%)
Zstandard (Wikipedia)	zstd	zstd -19	134525 bytes	-16626 bytes (-11.00%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	136103 bytes	-15048 bytes (-9.96%)

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.