Choose a version:
47% The original file has 464852 bytes (454.0k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 218317 bytes (213.2k, 47%).

After GZIP compression these minified files vary in size:
Boot
  83918 bytes (82.0k)
CDN
cdnjs
  73996 bytes (72.3k)
CDN
gzip -6 (default)
  73414 bytes (71.7k)
local copy
gzip -9
  73135 bytes (71.4k)
local copy
libdeflate -12
  70135 bytes (68.5k)
local copy
7zip -mx=9 -tgzip
  69956 bytes (68.3k)
local copy
kzip -s0 -rn -b7
  69552 bytes (67.9k)
local copy
pigz -11 -n
  69483 bytes (67.9k)
local copy
Zopfli
  69410 bytes (67.8k)
local copy
Zopfli (defluff)
  69408 bytes (67.8k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/d3/d3-4.10.1.min.js (or via HTTPS)

You will automatically get the smallest D3 4.10.1 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 4586 bytes by using my D3 4.10.1 Zopfli version instead of the best available CDN (6.61% smaller than cdnjs, 69410 vs. 73996 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 --mls32768 --bsr16 --lazy --ohh

(found September 5, 2017)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 32768  --mls32768
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

Even Smaller Files Thanks To Defluff

Zopfli's output can be further optimized by the defluff tool.
In this particular case, defluff saves 2 more bytes (69408 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/v4.10.1/d3.zip --location | md5sum
2111489beec28db6ceae589ad26c5e2d  -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-4.10.1.min.zopfli.js.gz | md5sum
2111489beec28db6ceae589ad26c5e2d  -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/mbostock/d3/v4.10.1/d3.zip --location | sha1sum
698ec1729355096dce6d00ad437c826d5bc69320  -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-4.10.1.min.zopfli.js.gz | sha1sum
698ec1729355096dce6d00ad437c826d5bc69320  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 83918 bytes 2111489beec28db6ceae589ad26c5e2d September 4, 2017 @ 06:33
cdnjs 73996 bytes 2111489beec28db6ceae589ad26c5e2d September 3, 2017 @ 01:04

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

Other Versions

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

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
69410 bytes -4 bytes zopfli --i1000000 --mls32768 --bsr16 --lazy --ohh September 5, 2017 @ 01:14
69414 bytes -7 bytes zopfli --i100000 --mls32768 --bsr16 --lazy --ohh September 4, 2017 @ 14:19
69421 bytes -4 bytes zopfli --i10000 --mls32768 --bsr16 --lazy --ohh September 4, 2017 @ 13:17
69425 bytes -13 bytes zopfli --i1000 --mls32768 --bsr16 --lazy --ohh September 4, 2017 @ 13:10
69438 bytes -2 bytes zopfli --i1000 --mls4096 --bsr40 --lazy --ohh September 4, 2017 @ 13:10
69440 bytes -2 bytes zopfli --i1000 --mls128 --bsr17 --lazy --ohh September 4, 2017 @ 13:06
69442 bytes zopfli --i100 --mls32768 --bsr16 --lazy --ohh September 4, 2017 @ 12:58

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

Most recent activity on September 6, 2017 @ 08:15.

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
69777 69783 69602 69619 69603 69581 69539 69549 69601 69689 69683 69533 69702 69718 69665
69550 69564 69883 69873 69592 69601 69859 69573 69567 69548 69518 69657 69630 69590 69586
69503 69512 69457 69557 69496 69523 69509 69506 69460 69473 69477 69440 69479 69498 69571
69595 69592 69468 69467 69555 69465 69653 69542 69456 69485 69459 69440 69486 69535 69491
69457 69454 69462 69464 69513 69462 69470 69477 69457 69511 69469 69471 69611 69539 69529
69510 69501 69454 69457 69500 69533 69458 69505 69450 69438 69491 69467 69511 69440 69521
69486 69494 69511 69484 69486 69455 69436 69450 69460 69490 69449 69462 69607 69623 69486
69479 69455 69479 69482 69470 69455 69473 69461 69459 69472 69469 69627 69582 69492 69489
69459 69463 69463 69466 69466 69460 69459 69465 69461 69463 69464 69488 69541 69492 69465
69465 69458 69470 69459 69461 69465 69478 69466 69464 69490 69458 69462 69511 69481 69518
69509 69507 69462 69462 69465 69481 69468 69457 69497 69458 69485 69505 69584 69536 69507
69465 69461 69464 69451 69456 69484 69468 69464 69464 69496 69468 69463 69494 69494 69481
69628 69463 69473 69462 69464 69487 69465 69458 69464 69491 69457 69626 69623 69532 69410
69497 69465 69472 69462 69468 69489 69432 69462 69468 69511 69461 69459 69596 69534 69463
69459 69452 69458 69472 69465 69495 69458 69463 69458 69465 69453 69444 69471 69454 69458
69526 69510 69458 69463 69459 69455 69456 69465 69458 69462 69486 69464 69619 69516 69524
69453 69456 69461 69446 69467 69468 69450 69457 69456 69460 69460 69519 69478 69487 69448
69465 69459 69465 69468 69463 69451 69458 69461 69461 69465 69460 69461 69596 69543 69507
69574 69568 69457 69459 69473 69459 69462 69464 69452 69469 69458 69489 69462 69461 69520
69464 69461 69456 69459 69463 69462 69474 69461 69455 69458 69449 69462 69603 69459 69478
69455 69456 69458 69467 69455 69457 69466 69465 69457 69460 69468 69465 69459 69466 69519
69466 69465 69463 69463 69468 69457 69466 69454 69459 69452 69437 69455 69600 69495 69524
69458 69461 69461 69465 69457 69459 69473 69460 69459 69460 69480 69424 69559 69502 69522

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 69442 bytes 100%
1,000 69425 bytes -17 bytes 100%
10,000 69421 bytes -4 bytes 100%
100,000 69414 bytes -7 bytes 0.58%
1,000,000 69410 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
69671 bytes +261 bytes (+0.38%) +119 bytes
70900 bytes +1490 bytes (+2.15%) +1348 bytes
70743 bytes +1333 bytes (+1.92%) +1191 bytes
69684 bytes +274 bytes (+0.39%) +132 bytes
69674 bytes +264 bytes (+0.38%) +122 bytes
69690 bytes +280 bytes (+0.40%) +138 bytes
69682 bytes +272 bytes (+0.39%) +130 bytes
69552 bytes +142 bytes (+0.20%)
69562 bytes +152 bytes (+0.22%) +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 - but your browser doesn't support it.
Algorithm Program Parameters Size Compared To Best Zopfli
ZPAQ (Wikipedia) zpaq zpaq -method 69 54547 bytes -14863 bytes (-21.41%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 60185 bytes -9225 bytes (-13.29%)
LZMA2 (Wikipedia) xz xz -9 61572 bytes -7838 bytes (-11.29%)
Brotli (Wikipedia) brotli brotli -q 11 61575 bytes -7835 bytes (-11.29%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 62289 bytes -7121 bytes (-10.26%)
Zstandard (Wikipedia) zstd zstd -19 66798 bytes -2612 bytes (-3.76%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 67651 bytes -1759 bytes (-2.53%)

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 2018.
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