D3 3.4.8 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 326272 bytes (318.6k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 146525 bytes (143.1k, 45%).

After GZIP compression these minified files vary in size:

Boot	58633 bytes (57.3k)	CDN
Baidu	51688 bytes (50.5k)	CDN
cdnjs	51676 bytes (50.5k)	CDN
unpkg	51380 bytes (50.2k)	CDN
gzip -6 (default)	51295 bytes (50.1k)	local copy
gzip -9	51137 bytes (49.9k)	local copy
libdeflate -12	49492 bytes (48.3k)	local copy
7zip -mx=9 -tgzip	49400 bytes (48.2k)	local copy
zultra	49319 bytes (48.2k)	local copy
kzip -s0 -rn -b8	49174 bytes (48.0k)	local copy
pigz -11 -n	49171 bytes (48.0k)	local copy
Zopfli	49097 bytes (47.9k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/d3/d3-3.4.8.min.js (or via HTTPS)

You will automatically get the smallest D3 3.4.8 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 2283 bytes by using my D3 3.4.8 Zopfli version instead of the best available CDN (4.65% smaller than unpkg, 49097 vs. 51380 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 --i100000 --mb8 --mls1024 --bsr16 --lazy --ohh

(found December 22, 2015)

Description	Value	Parameter
iterations	100000	--i100000
maximum blocks	8	--mb8
maximum length score	1024	--mls1024
block splitting recursion	16	--bsr16
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

Verify file integrity

After decompression, my uncompressed files are identical to the original ones:

MD5:
curl --silent --compressed https://raw.githubusercontent.com/mbostock/d3/v3.4.8/d3.min.js --location | md5sum
8e2ed78d07426a8ba81629f3dbd3069b -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-3.4.8.min.zopfli.js.gz | md5sum
8e2ed78d07426a8ba81629f3dbd3069b -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/mbostock/d3/v3.4.8/d3.min.js --location | sha1sum
24e9cffeb10576736b39ef2a71b5c5c5d3242173 -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-3.4.8.min.zopfli.js.gz | sha1sum
24e9cffeb10576736b39ef2a71b5c5c5d3242173 -

These CDNs send you the original file:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	58633 bytes	8e2ed78d07426a8ba81629f3dbd3069b	(invalid)
cdnjs	51676 bytes	8e2ed78d07426a8ba81629f3dbd3069b	(invalid)
unpkg	51380 bytes	8e2ed78d07426a8ba81629f3dbd3069b	July 11, 2016 @ 16:31

And some CDNs send you a different file:

CDN	Size (compressed)	MD5 (uncompressed)	Comment / Diff	Timestamp
Baidu	51688 bytes	17c1f6b50029040462b6c1fea815b7b7	only whitespaces differ	(invalid)

Note: only the MD5 hashes are shown to keep things simple.

Other Versions

Available D3 versions at minime.stephan-brumme.com:

6.7.0, 6.6.2, 6.6.1, 6.6.0, 6.5.0, 6.4.0, 6.3.1, 6.2.0, 6.1.1, 6.1.0, 6.0.0,
5.16.0, 5.15.1, 5.15.0, 5.14.2, 5.14.1, 5.14.0, 5.13.1, 5.13.0, 5.12.0, 5.11.0, 5.10.1, 5.10.0,
5.9.7, 5.9.6, 5.9.5, 5.9.4, 5.9.3, 5.9.2, 5.9.1, 5.9.0, 5.8.2, 5.8.1, 5.8.0, 5.7.0, 5.6.0, 5.5.0, 5.4.0, 5.3.0, 5.2.0, 5.1.0, 5.0.1, 5.0.0,
4.13.0, 4.12.2, 4.12.1, 4.12.0, 4.11.0, 4.10.2, 4.10.1, 4.10.0,
4.9.1, 4.9.0, 4.8.0, 4.7.4, 4.7.3, 4.7.2, 4.7.1, 4.7.0, 4.6.0, 4.5.0, 4.4.4, 4.4.3, 4.4.2, 4.4.1, 4.4.0, 4.3.0, 4.2.8, 4.2.7, 4.2.6, 4.2.5, 4.2.4, 4.2.3, 4.2.2, 4.2.1, 4.2.0, 4.1.1, 4.1.0, 4.0.0,
3.5.17, 3.5.16, 3.5.15, 3.5.14, 3.5.13, 3.5.12, 3.5.11, 3.5.10, 3.5.9, 3.5.8, 3.5.7, 3.5.6, 3.5.5, 3.5.4, 3.5.3, 3.5.2, 3.5.1, 3.5.0, 3.4.13, 3.4.12, 3.4.11, 3.4.10, 3.4.9, 3.4.8, 3.4.6, 3.4.5, 3.4.4, 3.4.3, 3.4.2, 3.4.1, 3.4.0, 3.3.13, 3.3.12, 3.3.11, 3.3.10, 3.3.9, 3.3.8, 3.3.7, 3.3.6, 3.3.5, 3.3.4, 3.3.3, 3.3.2, 3.3.1, 3.3.0, 3.2.8, 3.2.7, 3.2.6, 3.2.5, 3.2.4, 3.2.3, 3.2.2, 3.2.1, 3.2.0, 3.1.10, 3.1.9, 3.1.8, 3.1.7, 3.1.6, 3.1.5, 3.1.4, 3.1.3, 3.1.2, 3.1.1, 3.1.0, 3.0.8, 3.0.7, 3.0.6, 3.0.5, 3.0.4, 3.0.3, 3.0.2, 3.0.1, 3.0.0

The project site contains an overview how well these versions were compressed.
Other interesting projects are AngularJS, BackboneJS, Bootstrap, Dojo, Ember, jQuery, Knockout, lodash, React, Socket.IO, ThreeJS, UnderscoreJS and Vue.

Changelog

Best Zopfli parameters so far:

Size	Improvement	Parameters	Found
49097 bytes	-6 bytes	zopfli --i100000 --mls1024 --bsr16 --lazy --ohh	December 22, 2015 @ 14:30
49103 bytes	-8 bytes	zopfli --i10000 --mls1024 --bsr16 --lazy --ohh	October 13, 2015 @ 19:37
49111 bytes	-1 byte	zopfli --i1000 --mls1024 --bsr16 --lazy --ohh	September 19, 2015 @ 08:31
49112 bytes	-6 bytes	zopfli --i1000 --mls512 --bsr4 --lazy --ohh	September 19, 2015 @ 08:17
49118 bytes	-9 bytes	zopfli --i1000 --mls256 --bsr6 --lazy --ohh	September 19, 2015 @ 08:13
49127 bytes	-4 bytes	zopfli --i1000 --mls16 --bsr14 --lazy --ohh	September 19, 2015 @ 08:01
49131 bytes	–	zopfli --i100 --mls1024 --bsr16 --lazy --ohh	September 18, 2015 @ 19:44

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 @ 12:49.

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 100,000.

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	49248	49251	49249	49251	49251	49260	49260	49262	49257	49267	49266	49343	49361	49227	49360
4	49140	49123	49124	49159	49149	49175	49138	49131	49107	49214	49198	49248	49357	49221	49358
6	49159	49233	49157	49155	49155	49125	49124	49114	49145	49158	49196	49360	49357	49364	49359
7	49114	49169	49158	49153	49150	49136	49126	49213	49133	49210	49201	49227	49357	49222	49221
8	49174	49219	49206	49151	49192	49181	49133	49134	49137	49107	49225	49220	49357	49206	49243
9	49168	49185	49282	49169	49161	49144	49122	49213	49217	49117	49199	49213	49357	49201	49205
10	49171	49202	49150	49170	49160	49130	49123	49125	49134	49117	49198	49220	49358	49210	49200
11	49165	49192	49218	49151	49164	49130	49131	49127	49108	49118	49204	49216	49357	49205	49204
12	49165	49205	49260	49156	49157	49175	49131	49125	49132	49120	49195	49216	49357	49204	49202
13	49171	49209	49150	49173	49149	49145	49122	49127	49133	49124	49200	49202	49356	49221	49203
14	49113	49125	49157	49121	49173	49142	49130	49132	49134	49123	49198	49213	49357	49211	49204
15	49171	49127	49159	49130	49162	49129	49123	49132	49138	49131	49203	49215	49357	49199	49200
16	49157	49183	49151	49152	49159	49143	49123	49136	49134	49097	49200	49220	49356	49202	49206
17	49173	49184	49149	49168	49161	49188	49124	49132	49131	49120	49198	49210	49357	49201	49211
18	49171	49176	49157	49169	49165	49180	49128	49139	49134	49213	49198	49212	49357	49203	49204
19	49109	49201	49159	49176	49155	49128	49125	49131	49134	49216	49196	49219	49356	49202	49211
20	49161	49184	49145	49159	49139	49172	49127	49127	49134	49123	49195	49208	49357	49211	49236
21	49166	49203	49150	49151	49156	49145	49127	49128	49141	49120	49203	49213	49357	49202	49207
22	49166	49180	49156	49129	49175	49187	49127	49139	49136	49215	49201	49220	49358	49209	49206
23	49252	49200	49157	49173	49178	49173	49128	49130	49133	49120	49198	49213	49356	49200	49220
25	49174	49155	49153	49170	49174	49186	49129	49133	49133	49118	49207	49225	49356	49203	49203
30	49174	49198	49167	49127	49122	49111	49131	49208	49137	49121	49199	49212	49357	49201	49201
40	49170	49204	49169	49171	49160	49135	49127	49126	49136	49199	49203	49212	49358	49202	49202

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	49131 bytes	–	100%
1,000	49111 bytes	-20 bytes	100%
10,000	49103 bytes	-8 bytes	100%
100,000	49097 bytes	-6 bytes	0.87%
1,000,000	–	–	–
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)	49383 bytes	+286 bytes (+0.58%)	+209 bytes
1	49386 bytes	+289 bytes (+0.59%)	+212 bytes
2	49400 bytes	+303 bytes (+0.62%)	+226 bytes
3	49420 bytes	+323 bytes (+0.66%)	+246 bytes
4	49351 bytes	+254 bytes (+0.52%)	+177 bytes
5	49349 bytes	+252 bytes (+0.51%)	+175 bytes
6	49314 bytes	+217 bytes (+0.44%)	+140 bytes
7	49216 bytes	+119 bytes (+0.24%)	+42 bytes
8	49174 bytes	+77 bytes (+0.16%)	–

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	39136 bytes	-9961 bytes (-20.29%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	41567 bytes	-7530 bytes (-15.34%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	42454 bytes	-6643 bytes (-13.53%)
Brotli (Wikipedia)	brotli	brotli -q 11	44351 bytes	-4746 bytes (-9.67%)
LZMA2 (Wikipedia)	xz	xz -9	45072 bytes	-4025 bytes (-8.20%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	46802 bytes	-2295 bytes (-4.67%)
Zstandard (Wikipedia)	zstd	zstd -19	47465 bytes	-1632 bytes (-3.32%)

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 2024.
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.