D3 5.9.7 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 507512 bytes (495.6k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 243028 bytes (237.3k, 48%).

After GZIP compression these minified files vary in size:

unpkg	91465 bytes (89.3k)	CDN
Boot	80283 bytes (78.4k)	CDN
cdnjs	80283 bytes (78.4k)	CDN
gzip -6 (default)	79574 bytes (77.7k)	local copy
gzip -9	79285 bytes (77.4k)	local copy
libdeflate -12	76060 bytes (74.3k)	local copy
7zip -mx=9 -tgzip	75636 bytes (73.9k)	local copy
zultra	75329 bytes (73.6k)	local copy
kzip -s0 -rn -b7	75325 bytes (73.6k)	local copy
pigz -11 -n	75179 bytes (73.4k)	local copy
Zopfli	75084 bytes (73.3k)	local copy
Zopfli (defluff)	75082 bytes (73.3k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/d3/d3-5.9.7.min.js (or via HTTPS)

You will automatically get the smallest D3 5.9.7 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 5199 bytes by using my D3 5.9.7 Zopfli version instead of the best available CDN (6.92% smaller than cdnjs, 75084 vs. 80283 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 --mls16384 --bsr6 --lazy --ohh

(found July 6, 2019)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	16384	--mls16384
block splitting recursion	6	--bsr6
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 (75082 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/v5.9.7/d3.zip --location | md5sum
f698183caeecc81bd2548435dc078ac7 -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-5.9.7.min.zopfli.js.gz | md5sum
f698183caeecc81bd2548435dc078ac7 -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/mbostock/d3/v5.9.7/d3.zip --location | sha1sum
ce8179d3b0b1bf1ce64881a02b8b6a2ddbc14e23 -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-5.9.7.min.zopfli.js.gz | sha1sum
ce8179d3b0b1bf1ce64881a02b8b6a2ddbc14e23 -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
unpkg	91465 bytes	f698183caeecc81bd2548435dc078ac7	(invalid)
Boot	80283 bytes	f698183caeecc81bd2548435dc078ac7	June 29, 2019 @ 12:46
cdnjs	80283 bytes	f698183caeecc81bd2548435dc078ac7	June 29, 2019 @ 12:46

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
75084 bytes	-3 bytes	zopfli --i1000000 --mls16384 --bsr6 --lazy --ohh	July 6, 2019 @ 00:11
75087 bytes	-10 bytes	zopfli --i100000 --mls16384 --bsr6 --lazy --ohh	July 5, 2019 @ 05:36
75097 bytes	-8 bytes	zopfli --i10000 --mls16384 --bsr6 --lazy --ohh	July 4, 2019 @ 04:02
75105 bytes	-12 bytes	zopfli --i1000 --mls16384 --bsr6 --lazy --ohh	July 3, 2019 @ 14:37
75117 bytes	-9 bytes	zopfli --i1000 --mls16384 --bsr16 --lazy --ohh	July 3, 2019 @ 14:02
75126 bytes	–	zopfli --i100 --mls16384 --bsr6 --lazy --ohh	July 3, 2019 @ 13:35

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 @ 12:55.

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	75571	75572	75641	75567	75589	75571	75574	75552	75472	75384	75706	75347	75349	75386	75567
4	75677	75442	75381	75561	75403	75406	75353	75375	75610	75208	75186	75261	75463	75360	75315
6	75145	75151	75181	75163	75154	75139	75155	75165	75133	75154	75174	75370	75197	75084	75275
7	75472	75379	75476	75147	75151	75174	75341	75337	75363	75173	75132	75138	75128	75261	75268
8	75467	75457	75556	75208	75203	75431	75430	75429	75328	75189	75248	75286	75269	75275	75294
9	75472	75479	75451	75149	75337	75328	75154	75168	75333	75146	75140	75138	75313	75277	75136
10	75488	75481	75474	75146	75154	75343	75340	75149	75152	75168	75162	75141	75314	75120	75187
11	75470	75379	75435	75186	75160	75149	75336	75174	75331	75147	75161	75341	75129	75261	75184
12	75163	75165	75164	75350	75150	75339	75333	75150	75326	75153	75150	75341	75134	75278	75189
13	75476	75476	75474	75352	75154	75148	75146	75334	75341	75148	75153	75364	75272	75146	75213
14	75460	75477	75477	75146	75333	75335	75337	75357	75333	75185	75135	75133	75310	75281	75187
15	75452	75461	75162	75146	75149	75327	75360	75156	75362	75175	75135	75142	75131	75262	75194
16	75473	75477	75476	75143	75146	75336	75140	75336	75330	75145	75147	75137	75129	75102	75273
17	75354	75475	75383	75205	75433	75335	75204	75196	75336	75157	75153	75141	75126	75274	75187
18	75478	75480	75480	75151	75160	75339	75338	75152	75352	75149	75140	75138	75132	75263	75294
19	75459	75475	75477	75148	75147	75337	75341	75149	75333	75154	75152	75140	75314	75315	75186
20	75472	75476	75479	75149	75152	75333	75144	75331	75338	75188	75147	75134	75315	75333	75267
21	75456	75474	75490	75148	75462	75332	75336	75330	75330	75337	75131	75138	75332	75332	75190
22	75481	75475	75478	75149	75338	75334	75335	75334	75334	75337	75137	75146	75131	75266	75215
23	75474	75474	75479	75148	75159	75144	75336	75338	75335	75142	75139	75139	75126	75129	75193
25	75162	75165	75478	75155	75151	75329	75335	75150	75333	75153	75144	75139	75125	75276	75185
30	75474	75473	75474	75147	75456	75337	75339	75342	75431	75336	75128	75136	75326	75264	75266
40	75479	75480	75480	75148	75143	75333	75337	75342	75335	75147	75151	75130	75319	75315	75234

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	75126 bytes	–	100%
1,000	75105 bytes	-21 bytes	100%
10,000	75097 bytes	-8 bytes	100%
100,000	75087 bytes	-10 bytes	0.58%
1,000,000	75084 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
(any)	75533 bytes	+449 bytes (+0.60%)	+208 bytes
1	76901 bytes	+1817 bytes (+2.42%)	+1576 bytes
2	76776 bytes	+1692 bytes (+2.25%)	+1451 bytes
3	75541 bytes	+457 bytes (+0.61%)	+216 bytes
4	75551 bytes	+467 bytes (+0.62%)	+226 bytes
5	75529 bytes	+445 bytes (+0.59%)	+204 bytes
6	75346 bytes	+262 bytes (+0.35%)	+21 bytes
7	75325 bytes	+241 bytes (+0.32%)	–
8	75353 bytes	+269 bytes (+0.36%)	+28 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	59304 bytes	-15780 bytes (-21.02%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	65965 bytes	-9119 bytes (-12.15%)
LZMA2 (Wikipedia)	xz	xz -9	66812 bytes	-8272 bytes (-11.02%)
Brotli (Wikipedia)	brotli	brotli -q 11	67003 bytes	-8081 bytes (-10.76%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	68700 bytes	-6384 bytes (-8.50%)
Zstandard (Wikipedia)	zstd	zstd -19	72220 bytes	-2864 bytes (-3.81%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	74792 bytes	-292 bytes (-0.39%)

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.