D3 5.9.4 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 507463 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 242984 bytes (237.3k, 48%).

After GZIP compression these minified files vary in size:

unpkg	91491 bytes (89.3k)	CDN
Boot	80246 bytes (78.4k)	CDN
cdnjs	80246 bytes (78.4k)	CDN
gzip -6 (default)	79529 bytes (77.7k)	local copy
gzip -9	79238 bytes (77.4k)	local copy
libdeflate -12	76084 bytes (74.3k)	local copy
7zip -mx=9 -tgzip	75593 bytes (73.8k)	local copy
zultra	75342 bytes (73.6k)	local copy
kzip -s0 -rn -b8	75336 bytes (73.6k)	local copy
pigz -11 -n	75131 bytes (73.4k)	local copy
Zopfli	75055 bytes (73.3k)	local copy
Zopfli (defluff)	75052 bytes (73.3k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/d3/d3-5.9.4.min.js (or via HTTPS)

You will automatically get the smallest D3 5.9.4 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 5191 bytes by using my D3 5.9.4 Zopfli version instead of the best available CDN (6.92% smaller than cdnjs, 75055 vs. 80246 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 --mls32768 --bsr11 --lazy --ohh

(found July 6, 2019)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	32768	--mls32768
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 3 more bytes (75052 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/v5.9.4/d3.zip --location | md5sum
5a02a4fe9dee70c8814e2b556d5da951 -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-5.9.4.min.zopfli.js.gz | md5sum
5a02a4fe9dee70c8814e2b556d5da951 -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/mbostock/d3/v5.9.4/d3.zip --location | sha1sum
2ab8e73bc900d97b4af51c52187cbee73e990d2c -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-5.9.4.min.zopfli.js.gz | sha1sum
2ab8e73bc900d97b4af51c52187cbee73e990d2c -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
unpkg	91491 bytes	5a02a4fe9dee70c8814e2b556d5da951	(invalid)
Boot	80246 bytes	5a02a4fe9dee70c8814e2b556d5da951	June 29, 2019 @ 12:46
cdnjs	80246 bytes	5a02a4fe9dee70c8814e2b556d5da951	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
75055 bytes	-4 bytes	zopfli --i1000000 --mls32768 --bsr11 --lazy --ohh	July 6, 2019 @ 01:50
75059 bytes	-7 bytes	zopfli --i100000 --mls32768 --bsr11 --lazy --ohh	July 5, 2019 @ 12:29
75066 bytes	-5 bytes	zopfli --i10000 --mls32768 --bsr11 --lazy --ohh	July 2, 2019 @ 18:02
75071 bytes	-7 bytes	zopfli --i10000 --mls16384 --bsr16 --lazy --ohh	July 2, 2019 @ 17:00
75078 bytes	-19 bytes	zopfli --i1000 --mls32768 --bsr6 --lazy --ohh	July 2, 2019 @ 12:43
75097 bytes	–	zopfli --i100 --mls32768 --bsr6 --lazy --ohh	July 2, 2019 @ 12:05

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 @ 12:43.

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	75540	75546	75607	75516	75515	75526	75319	75503	75300	75347	75669	75339	75320	75328	75490
4	75412	75424	75337	75370	75180	75181	75316	75333	75586	75399	75186	75236	75404	75243	75300
6	75115	75322	75438	75120	75097	75134	75118	75136	75096	75128	75153	75144	75123	75231	75055
7	75326	75134	75472	75180	75107	75300	75113	75310	75110	75441	75124	75294	75257	75237	75151
8	75100	75339	75160	75169	75158	75163	75399	75394	75313	75342	75218	75252	75250	75192	75158
9	75330	75138	75411	75116	75120	75299	75327	75117	75294	75295	75112	75297	75284	75270	75105
10	75419	75304	75343	75120	75118	75327	75311	75134	75300	75292	75134	75102	75253	75222	75101
11	75322	75428	75392	75155	75115	75099	75109	75173	75317	75113	75115	75293	75092	75110	75055
12	75120	75414	75345	75103	75109	75101	75304	75116	75293	75295	75111	75295	75250	75254	75159
13	75115	75414	75417	75115	75100	75332	75307	75305	75293	75295	75115	75322	75228	75336	75231
14	75417	75305	75437	75311	75302	75126	75329	75306	75330	75343	75117	75095	75280	75270	75230
15	75422	75432	75441	75412	75296	75119	75307	75312	75117	75293	75138	75301	75234	75236	75152
16	75419	75412	75341	75118	75114	75104	75302	75121	75112	75296	75114	75300	75095	75068	75153
17	75420	75309	75409	75174	75166	75164	75173	75170	75293	75292	75118	75293	75095	75244	75152
18	75118	75110	75111	75118	75116	75104	75307	75126	75126	75291	75113	75104	75276	75223	75151
19	75419	75318	75337	75109	75295	75104	75308	75131	75120	75293	75116	75294	75276	75237	75150
20	75417	75413	75412	75118	75295	75296	75304	75307	75319	75340	75122	75300	75278	75234	75233
21	75318	75418	75331	75116	75297	75296	75305	75303	75114	75303	75297	75299	75278	75336	75156
22	75427	75421	75442	75425	75297	75296	75327	75305	75304	75305	75299	75145	75281	75236	75153
23	75412	75416	75328	75121	75110	75122	75306	75118	75292	75301	75115	75101	75095	75279	75153
25	75116	75115	75441	75118	75297	75099	75307	75116	75303	75302	75117	75091	75277	75234	75152
30	75419	75414	75446	75421	75297	75305	75303	75307	75299	75312	75307	75302	75297	75232	75234
40	75429	75412	75444	75319	75298	75102	75311	75304	75303	75292	75119	75293	75277	75290	75102

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	75097 bytes	–	100%
1,000	75078 bytes	-19 bytes	100%
10,000	75066 bytes	-12 bytes	100%
100,000	75059 bytes	-7 bytes	1.45%
1,000,000	75055 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)	75502 bytes	+447 bytes (+0.60%)	+166 bytes
1	76858 bytes	+1803 bytes (+2.40%)	+1522 bytes
2	76735 bytes	+1680 bytes (+2.24%)	+1399 bytes
3	75503 bytes	+448 bytes (+0.60%)	+167 bytes
4	75514 bytes	+459 bytes (+0.61%)	+178 bytes
5	75501 bytes	+446 bytes (+0.59%)	+165 bytes
6	75521 bytes	+466 bytes (+0.62%)	+185 bytes
7	75340 bytes	+285 bytes (+0.38%)	+4 bytes
8	75336 bytes	+281 bytes (+0.37%)	–

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	59177 bytes	-15878 bytes (-21.16%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	65963 bytes	-9092 bytes (-12.11%)
LZMA2 (Wikipedia)	xz	xz -9	66804 bytes	-8251 bytes (-10.99%)
Brotli (Wikipedia)	brotli	brotli -q 11	67023 bytes	-8032 bytes (-10.70%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	68673 bytes	-6382 bytes (-8.50%)
Zstandard (Wikipedia)	zstd	zstd -19	72197 bytes	-2858 bytes (-3.81%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	74775 bytes	-280 bytes (-0.37%)

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 2025.
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.