D3 4.7.0 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 455040 bytes (444.4k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 215819 bytes (210.8k, 47%).

After GZIP compression these minified files vary in size:

Boot	83036 bytes (81.1k)	CDN
cdnjs	73431 bytes (71.7k)	CDN
gzip -6 (default)	72989 bytes (71.3k)	local copy
jsdelivr	72982 bytes (71.3k)	CDN
gzip -9	72712 bytes (71.0k)	local copy
libdeflate -12	69886 bytes (68.2k)	local copy
7zip -mx=9 -tgzip	69647 bytes (68.0k)	local copy
zultra	69419 bytes (67.8k)	local copy
kzip -s0 -rn -b7	69315 bytes (67.7k)	local copy
pigz -11 -n	69173 bytes (67.6k)	local copy
Zopfli	69096 bytes (67.5k)	local copy
Zopfli (defluff)	69092 bytes (67.5k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/d3/d3-4.7.0.min.js (or via HTTPS)

You will automatically get the smallest D3 4.7.0 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 3886 bytes by using my D3 4.7.0 Zopfli version instead of the best available CDN (5.62% smaller than jsdelivr, 69096 vs. 72982 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 --mls4 --bsr11 --lazy --ohh

(found May 3, 2017)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	4	--mls4
block splitting recursion	11	--bsr11
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 4 more bytes (69092 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/v4.7.0/d3.zip --location | md5sum
9abe1be5a187a5d757f87656bfe69953 -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-4.7.0.min.zopfli.js.gz | md5sum
9abe1be5a187a5d757f87656bfe69953 -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/mbostock/d3/v4.7.0/d3.zip --location | sha1sum
4e4d4eee3efb4cba137e96f8fd5f57cee1ea772d -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-4.7.0.min.zopfli.js.gz | sha1sum
4e4d4eee3efb4cba137e96f8fd5f57cee1ea772d -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	83036 bytes	9abe1be5a187a5d757f87656bfe69953	March 3, 2017 @ 17:52
cdnjs	73431 bytes	9abe1be5a187a5d757f87656bfe69953	February 28, 2017 @ 21:33
jsdelivr	72982 bytes	9abe1be5a187a5d757f87656bfe69953	October 25, 2017 @ 16:11

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
69096 bytes	-4 bytes	zopfli --i1000000 --mls4 --bsr11 --lazy --ohh	May 3, 2017 @ 08:51
69100 bytes	-1 byte	zopfli --i100000 --mls4 --bsr20 --lazy --ohh	May 2, 2017 @ 19:36
69101 bytes	-4 bytes	zopfli --i100000 --mls4 --bsr11 --lazy --ohh	May 2, 2017 @ 18:18
69105 bytes	-10 bytes	zopfli --i10000 --mls4 --bsr11 --lazy --ohh	April 29, 2017 @ 02:48
69115 bytes	-2 bytes	zopfli --i1000 --mls4 --bsr20 --lazy --ohh	April 28, 2017 @ 15:38
69117 bytes	-28 bytes	zopfli --i1000 --mls4 --bsr23 --lazy --ohh	April 28, 2017 @ 15:33
69145 bytes	–	zopfli --i100 --mls4 --bsr20 --lazy --ohh	April 28, 2017 @ 14:37

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	69431	69540	69352	69378	69393	69374	69408	69349	69380	69368	69357	69338	69323	69310	69375
4	69232	69214	69144	69143	69160	69168	69166	69144	69162	69285	69246	69257	69256	69259	69275
6	69238	69115	69123	69111	69132	69102	69128	69251	69263	69249	69251	69258	69256	69248	69254
7	69155	69146	69136	69150	69160	69185	69467	69242	69240	69247	69251	69281	69278	69253	69285
8	69175	69164	69123	69150	69255	69311	69330	69246	69265	69243	69261	69255	69266	69272	69263
9	69145	69148	69348	69158	69358	69305	69285	69255	69135	69241	69237	69241	69281	69249	69274
10	69145	69104	69186	69336	70138	69263	69338	69267	69240	69241	69248	69260	69247	69239	69253
11	69156	69096	69139	69104	69305	69275	69281	69249	69244	69236	69243	69258	69240	69257	69243
12	69181	69139	69140	69146	70160	69279	69310	69246	69291	69234	69246	69253	69268	69286	69290
13	69150	69148	69142	69153	69258	69266	69336	69270	69250	69236	69246	69267	69258	69272	69255
14	69155	69148	69226	69151	69289	69290	70160	69248	69259	69236	69243	69242	69240	69272	69239
15	69148	69188	69139	69149	69252	69316	69227	69247	69246	69240	69240	69252	69242	69242	69237
16	69176	69174	69136	69147	69253	69276	69223	69244	69137	69203	69244	69242	69238	69270	69298
17	69185	69238	69140	69149	69257	69353	69316	69236	69247	69203	69216	69249	69237	69244	69312
18	69150	70154	69301	69306	69343	69301	69338	69242	69269	69214	69204	69275	69272	69271	69287
19	69147	69148	69355	69309	69353	69361	69308	69213	69239	69219	69206	69244	69257	69242	69294
20	69193	69096	69265	69298	69342	69261	69330	69244	69248	69236	69210	69257	69256	69243	69295
21	69148	69149	69139	69151	69253	69260	69337	69243	69238	69207	69238	69249	69259	69235	69288
22	69150	69242	69140	69218	69217	69264	69340	69245	69240	69219	69243	69244	69254	69260	69299
23	69145	69111	69145	69147	69143	69188	69254	69245	69246	69209	69205	69257	69249	69245	69242
25	69145	69237	69139	69351	69256	69288	69273	69280	69247	69203	69214	69291	69273	69245	69243
30	69180	69183	69222	69184	69268	69234	69214	69260	69255	69217	69224	69257	69253	69257	69270
40	69185	69248	69226	69227	70142	69262	69252	69214	69228	69204	69214	69264	69254	69258	69272

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	69145 bytes	–	100%
1,000	69115 bytes	-30 bytes	100%
10,000	69105 bytes	-10 bytes	100%
100,000	69100 bytes	-5 bytes	2.03%
1,000,000	69096 bytes	-4 bytes	0.58%
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)	69339 bytes	+243 bytes (+0.35%)	+24 bytes
1	70652 bytes	+1556 bytes (+2.25%)	+1337 bytes
2	70334 bytes	+1238 bytes (+1.79%)	+1019 bytes
3	69458 bytes	+362 bytes (+0.52%)	+143 bytes
4	69341 bytes	+245 bytes (+0.35%)	+26 bytes
5	69355 bytes	+259 bytes (+0.37%)	+40 bytes
6	69364 bytes	+268 bytes (+0.39%)	+49 bytes
7	69315 bytes	+219 bytes (+0.32%)	–
8	69320 bytes	+224 bytes (+0.32%)	+5 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	54234 bytes	-14862 bytes (-21.51%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	60392 bytes	-8704 bytes (-12.60%)
LZMA2 (Wikipedia)	xz	xz -9	61208 bytes	-7888 bytes (-11.42%)
Brotli (Wikipedia)	brotli	brotli -q 11	61463 bytes	-7633 bytes (-11.05%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	62337 bytes	-6759 bytes (-9.78%)
Zstandard (Wikipedia)	zstd	zstd -19	66768 bytes	-2328 bytes (-3.37%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	67809 bytes	-1287 bytes (-1.86%)

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.