Choose a version:
48% The original file has 558017 bytes (544.9k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 269303 bytes (263.0k, 48%).

After GZIP compression these minified files vary in size:
unpkg
  101966 bytes (99.6k)
CDN
Boot
  88993 bytes (86.9k)
CDN
cdnjs
  88993 bytes (86.9k)
CDN
gzip -6 (default)
  88452 bytes (86.4k)
local copy
gzip -9
  88166 bytes (86.1k)
local copy
libdeflate -12
  84743 bytes (82.8k)
local copy
7zip -mx=9 -tgzip
  84270 bytes (82.3k)
local copy
kzip -s0 -rn -b7
  84174 bytes (82.2k)
local copy
zultra
  84143 bytes (82.2k)
local copy
pigz -11 -n
  83828 bytes (81.9k)
local copy
Zopfli
  83718 bytes (81.8k)
local copy
Zopfli (defluff)
  83715 bytes (81.8k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/d3/d3-6.5.0.min.js (or via HTTPS)

You will automatically get the smallest D3 6.5.0 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 5275 bytes by using my D3 6.5.0 Zopfli version instead of the best available CDN (6.30% smaller than cdnjs, 83718 vs. 88993 bytes):
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 --bsr23 --lazy --ohh

(found February 10, 2021)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 8192  --mls8192
block splitting recursion 23  --bsr23
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 (83715 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://raw.githubusercontent.com/mbostock/d3/v6.5.0/d3.zip --location | md5sum
d5283f5cbf1df04525a6333db1bf9b9f  -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-6.5.0.min.zopfli.js.gz | md5sum
d5283f5cbf1df04525a6333db1bf9b9f  -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/mbostock/d3/v6.5.0/d3.zip --location | sha1sum
d92d60486a250bb6f0f15e1acaa238c2be7c9e3e  -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-6.5.0.min.zopfli.js.gz | sha1sum
d92d60486a250bb6f0f15e1acaa238c2be7c9e3e  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
unpkg 101966 bytes d5283f5cbf1df04525a6333db1bf9b9f (invalid)
Boot 88993 bytes d5283f5cbf1df04525a6333db1bf9b9f January 25, 2021 @ 03:27
cdnjs 88993 bytes d5283f5cbf1df04525a6333db1bf9b9f January 25, 2021 @ 03:27

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

Other Versions

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

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
83718 bytes -3 bytes zopfli --i1000000 --mls8192 --bsr23 --lazy --ohh February 10, 2021 @ 13:24
83721 bytes -1 byte zopfli --i100000 --mls8192 --bsr23 --lazy --ohh February 9, 2021 @ 17:50
83722 bytes -3 bytes zopfli --i100000 --mls8192 --bsr21 --lazy --ohh February 9, 2021 @ 16:04
83725 bytes -1 byte zopfli --i10000 --mls8192 --bsr21 --lazy --ohh February 9, 2021 @ 14:06
83726 bytes -9 bytes zopfli --i10000 --mls8192 --bsr12 --lazy --ohh February 9, 2021 @ 11:56
83735 bytes -15 bytes zopfli --i1000 --mls8192 --bsr21 --lazy --ohh February 8, 2021 @ 21:00
83750 bytes -9 bytes zopfli --i1000 --mls8192 --bsr22 --lazy --ohh February 8, 2021 @ 20:38
83759 bytes -13 bytes zopfli --i1000 --mls8192 --bsr13 --lazy --ohh February 8, 2021 @ 20:08
83772 bytes zopfli --i100 --mls8192 --bsr23 --lazy --ohh February 8, 2021 @ 19:43

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

Most recent activity on February 10, 2021 @ 15:59.

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
84057 84052 84152 84217 84107 84036 84039 84114 84100 84143 84025 84092 83975 84016 84086
84343 84031 84053 84060 84047 84033 84039 83831 84390 83810 83843 83835 83799 84050 83890
83850 83845 83965 83801 83805 83800 83796 83779 83981 83808 83886 83819 83759 83799 83755
84142 83996 84027 84028 83782 83974 83965 83776 84009 83845 84188 83900 83816 83728 83847
83770 83986 84111 84098 83955 84273 83867 83865 83887 83787 83894 83752 83788 83779 83815
83983 83979 84002 83990 83993 83957 83784 83776 83882 83785 83777 83771 83736 83789 83847
84008 83990 83960 83991 83978 83772 83771 83777 83874 83785 83768 83778 83753 83787 83843
84140 84097 84098 83999 83796 83979 83770 83771 83978 83839 83770 83775 83773 83936 83970
84232 84196 83960 83993 83995 83775 83768 83776 83974 83888 83915 83803 83726 83783 83981
83974 83979 84000 83957 83986 83767 83770 83781 83976 83773 83775 83802 83753 83935 83968
84000 83983 83960 83994 84003 83968 83768 83781 83977 83793 83784 83927 83778 83791 83977
83977 83978 84000 84001 84003 83981 83761 83781 83971 83786 83895 84121 83870 83871 83973
84151 83989 84178 84190 83912 83776 83934 83883 83975 83787 83879 84095 83873 84169 83865
84002 84005 84094 84095 83984 83958 83773 83771 83876 83785 83778 83776 83872 83868 83977
83996 83991 83988 83990 84001 84175 83849 83802 83876 83784 83771 83972 83730 83911 83973
84140 84005 84094 83994 84116 83982 83772 83774 83983 83783 83778 83771 83730 83867 83863
84011 83996 84089 84097 84122 83980 83771 83780 83971 83797 83871 83971 83866 83873 83939
83981 83979 84000 83998 84000 83982 83961 83771 83978 83788 83776 83791 83722 83869 83969
83982 83999 84007 83989 83987 83968 83770 83775 83879 83772 83771 83966 83739 83924 83938
84135 83975 84000 83991 84000 83773 83773 83771 83981 83785 83770 83972 83718 83868 83968
83977 83978 83997 84119 84005 83972 83772 83775 83774 83773 83773 83970 83753 83939 83969
84131 83992 83967 84095 84115 83957 83770 83776 83878 83776 83776 83970 83882 83942 83977
84171 83964 84097 84097 83987 83988 83770 83768 83975 83774 83769 83962 83834 84065 83973

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 83772 bytes 100%
1,000 83735 bytes -37 bytes 100%
10,000 83725 bytes -10 bytes 100%
100,000 83721 bytes -4 bytes 0.58%
1,000,000 83718 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
84192 bytes +474 bytes (+0.57%) +18 bytes
85570 bytes +1852 bytes (+2.21%) +1396 bytes
85408 bytes +1690 bytes (+2.02%) +1234 bytes
84196 bytes +478 bytes (+0.57%) +22 bytes
84201 bytes +483 bytes (+0.58%) +27 bytes
84192 bytes +474 bytes (+0.57%) +18 bytes
84199 bytes +481 bytes (+0.57%) +25 bytes
84174 bytes +456 bytes (+0.54%)
84184 bytes +466 bytes (+0.56%) +10 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 65423 bytes -18295 bytes (-21.85%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 72914 bytes -10804 bytes (-12.91%)
LZMA2 (Wikipedia) xz xz -9 74008 bytes -9710 bytes (-11.60%)
Brotli (Wikipedia) brotli brotli -q 11 74256 bytes -9462 bytes (-11.30%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 74703 bytes -9015 bytes (-10.77%)
Zstandard (Wikipedia) zstd zstd -19 79907 bytes -3811 bytes (-4.55%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 82722 bytes -996 bytes (-1.19%)

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):


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 2021.
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.