D3 4.7.4 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 455433 bytes (444.8k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 216008 bytes (210.9k, 47%).

After GZIP compression these minified files vary in size:

Boot	83024 bytes (81.1k)	CDN
cdnjs	73421 bytes (71.7k)	CDN
gzip -6 (default)	72978 bytes (71.3k)	local copy
jsdelivr	72808 bytes (71.1k)	CDN
gzip -9	72686 bytes (71.0k)	local copy
libdeflate -12	69881 bytes (68.2k)	local copy
7zip -mx=9 -tgzip	69621 bytes (68.0k)	local copy
zultra	69319 bytes (67.7k)	local copy
kzip -s0 -rn -b8	69305 bytes (67.7k)	local copy
pigz -11 -n	69142 bytes (67.5k)	local copy
Zopfli	69056 bytes (67.4k)	local copy
Zopfli (defluff)	69055 bytes (67.4k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/d3/d3-4.7.4.min.js (or via HTTPS)

You will automatically get the smallest D3 4.7.4 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 3752 bytes by using my D3 4.7.4 Zopfli version instead of the best available CDN (5.43% smaller than jsdelivr, 69056 vs. 72808 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 --mls512 --bsr9 --lazy --ohh

(found May 4, 2017)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	512	--mls512
block splitting recursion	9	--bsr9
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 (69055 bytes).

Download

Verify file integrity

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

MD5:
curl --silent --compressed https://raw.githubusercontent.com/mbostock/d3/v4.7.4/d3.zip --location | md5sum
df8b584f13760fca40f57c90d657c9a4 -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-4.7.4.min.zopfli.js.gz | md5sum
df8b584f13760fca40f57c90d657c9a4 -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/mbostock/d3/v4.7.4/d3.zip --location | sha1sum
4ee91f31be6e23f5c907e284bfe0c35d5bca2810 -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-4.7.4.min.zopfli.js.gz | sha1sum
4ee91f31be6e23f5c907e284bfe0c35d5bca2810 -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	83024 bytes	df8b584f13760fca40f57c90d657c9a4	March 31, 2017 @ 05:03
cdnjs	73421 bytes	df8b584f13760fca40f57c90d657c9a4	March 24, 2017 @ 17:48
jsdelivr	72808 bytes	df8b584f13760fca40f57c90d657c9a4	March 24, 2017 @ 17:33

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
69056 bytes	-6 bytes	zopfli --i1000000 --mls512 --bsr9 --lazy --ohh	May 4, 2017 @ 01:25
69062 bytes	-8 bytes	zopfli --i100000 --mls512 --bsr9 --lazy --ohh	May 3, 2017 @ 01:21
69070 bytes	-11 bytes	zopfli --i10000 --mls512 --bsr9 --lazy --ohh	April 29, 2017 @ 06:08
69081 bytes	-1 byte	zopfli --i1000 --mls512 --bsr9 --lazy --ohh	April 28, 2017 @ 15:53
69082 bytes	-11 bytes	zopfli --i1000 --mls2 --bsr21 --lazy --ohh	April 28, 2017 @ 15:36
69093 bytes	-15 bytes	zopfli --i1000 --mls16 --bsr30 --lazy --ohh	April 28, 2017 @ 15:34
69108 bytes	–	zopfli --i100 --mls512 --bsr9 --lazy --ohh	April 28, 2017 @ 15:19

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 @ 12:53.

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	69346	69346	69361	69373	69479	69427	69331	69323	69361	69354	69337	69313	69313	69305	69356
4	69350	69345	69133	69132	69171	69128	69179	69137	69129	69253	69223	69247	69227	69245	69243
6	69127	69085	69181	69093	69102	69101	69228	69223	69127	69237	69228	69247	69241	69265	69254
7	69102	69080	69085	69090	69080	69228	69459	69222	69204	69222	69221	69262	69245	69246	69257
8	69152	69106	69106	69084	69337	69328	69289	69201	69299	69219	69231	69244	69246	69236	69234
9	69079	69078	69095	69081	69084	69092	69220	69224	69056	69232	69222	69167	69261	69163	69263
10	69087	69084	69103	69092	69254	69213	69218	69228	69212	69203	69222	69115	69256	69222	69243
11	69079	69080	69089	69083	69084	69082	69223	69223	69086	69209	69218	69235	69263	69226	69234
12	69120	69080	69089	69139	69255	69223	69259	69213	69085	69222	69231	69234	69237	69257	69252
13	69081	69080	69109	69086	69214	69211	69212	69250	69202	69218	69218	69233	69253	69172	69248
14	69132	69083	69091	69079	69254	69225	69254	69225	69208	69221	69223	69252	69255	69223	69261
15	69079	69084	69086	69084	69081	69232	69211	69222	69227	69215	69219	69248	69225	69217	69254
16	69163	69116	69087	69082	69206	69231	69210	69227	69084	69217	69219	69237	69248	69197	69262
17	69124	69082	69090	69081	69256	69227	69206	69223	69092	69234	69217	69104	69222	69220	69231
18	69122	70172	70150	69200	69250	69223	69256	69223	69201	69184	69230	69265	69210	69233	69262
19	69079	69080	69089	69301	69206	69227	69223	69220	69223	69180	69195	69235	69203	69224	69261
20	69081	69084	69249	69203	69210	69224	69222	69225	69226	69184	69188	69250	69194	69226	69230
21	69070	69080	69090	69138	69200	69216	69333	69231	69201	69187	69229	69241	69212	69220	69250
22	69123	69081	69088	69085	69253	69223	69215	69225	69205	69183	69198	69243	69210	69222	69231
23	69121	69080	69090	69090	69080	69086	69211	69223	69215	69181	69224	69235	69197	69231	69227
25	69079	69084	69088	69084	69087	69088	69262	69226	69072	69183	69224	69116	69204	69225	69228
30	69129	69081	69084	69086	69201	69213	69258	69241	69210	69182	69183	69319	69214	69225	69194
40	69123	69080	69088	69229	69255	69206	69217	69225	69086	69186	69216	69202	69227	69204	69193

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	69108 bytes	–	100%
1,000	69081 bytes	-27 bytes	100%
10,000	69070 bytes	-11 bytes	100%
100,000	69062 bytes	-8 bytes	0.87%
1,000,000	69056 bytes	-6 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)	69328 bytes	+272 bytes (+0.39%)	+23 bytes
1	70640 bytes	+1584 bytes (+2.29%)	+1335 bytes
2	70321 bytes	+1265 bytes (+1.83%)	+1016 bytes
3	69448 bytes	+392 bytes (+0.57%)	+143 bytes
4	69327 bytes	+271 bytes (+0.39%)	+22 bytes
5	69336 bytes	+280 bytes (+0.41%)	+31 bytes
6	69347 bytes	+291 bytes (+0.42%)	+42 bytes
7	69308 bytes	+252 bytes (+0.36%)	+3 bytes
8	69305 bytes	+249 bytes (+0.36%)	–

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 - but your browser doesn't support it.

Algorithm	Program	Parameters	Size	Compared To Best Zopfli
ZPAQ (Wikipedia)	zpaq	zpaq -method 69	54323 bytes	-14733 bytes (-21.33%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	60364 bytes	-8692 bytes (-12.59%)
LZMA2 (Wikipedia)	xz	xz -9	61204 bytes	-7852 bytes (-11.37%)
Brotli (Wikipedia)	brotli	brotli -q 11	61350 bytes	-7706 bytes (-11.16%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	62340 bytes	-6716 bytes (-9.73%)
Zstandard (Wikipedia)	zstd	zstd -19	66740 bytes	-2316 bytes (-3.35%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	67824 bytes	-1232 bytes (-1.78%)

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.