D3 3.5.16 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 337943 bytes (330.0k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 151732 bytes (148.2k, 45%).

After GZIP compression these minified files vary in size:

Boot	61074 bytes (59.6k)	CDN
cdnjs	53936 bytes (52.7k)	CDN
unpkg	53660 bytes (52.4k)	CDN
gzip -6 (default)	53535 bytes (52.3k)	local copy
jsdelivr	53426 bytes (52.2k)	CDN
gzip -9	53399 bytes (52.1k)	local copy
libdeflate -12	51710 bytes (50.5k)	local copy
zultra	51659 bytes (50.4k)	local copy
7zip -mx=9 -tgzip	51637 bytes (50.4k)	local copy
pigz -11 -n	51371 bytes (50.2k)	local copy
kzip -s0 -rn -b7	51348 bytes (50.1k)	local copy
Zopfli	51287 bytes (50.1k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/d3/d3-3.5.16.min.js (or via HTTPS)

You will automatically get the smallest D3 3.5.16 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 2139 bytes by using my D3 3.5.16 Zopfli version instead of the best available CDN (4.17% smaller than jsdelivr, 51287 vs. 53426 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 --mls1024 --bsr6 --lazy --ohh

(found February 19, 2016)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	1024	--mls1024
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

Verify file integrity

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

MD5:
curl --silent --compressed https://raw.githubusercontent.com/mbostock/d3/v3.5.16/d3.min.js --location | md5sum
d1784140c4634b660528c86fac758217 -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-3.5.16.min.zopfli.js.gz | md5sum
d1784140c4634b660528c86fac758217 -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/mbostock/d3/v3.5.16/d3.min.js --location | sha1sum
67d801eacd484de18562b6cd4b1c967853f6d63c -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-3.5.16.min.zopfli.js.gz | sha1sum
67d801eacd484de18562b6cd4b1c967853f6d63c -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	61074 bytes	d1784140c4634b660528c86fac758217	February 18, 2016 @ 11:31
cdnjs	53936 bytes	d1784140c4634b660528c86fac758217	(invalid)
unpkg	53660 bytes	d1784140c4634b660528c86fac758217	July 11, 2016 @ 16:30
jsdelivr	53426 bytes	d1784140c4634b660528c86fac758217	February 18, 2016 @ 12:55

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
51287 bytes	-3 bytes	zopfli --i1000000 --mls1024 --bsr6 --lazy --ohh	February 19, 2016 @ 04:17
51290 bytes	-2 bytes	zopfli --i100000 --mls1024 --bsr6 --lazy --ohh	February 18, 2016 @ 15:37
51292 bytes	-5 bytes	zopfli --i10000 --mls1024 --bsr6 --lazy --ohh	February 18, 2016 @ 14:26
51297 bytes	-7 bytes	zopfli --i10000 --mls32768 --bsr16 --lazy --ohh	February 18, 2016 @ 10:17
51304 bytes	-12 bytes	zopfli --i1000 --mls32768 --bsr16 --lazy --ohh	February 18, 2016 @ 10:06
51316 bytes	–	zopfli --i100 --mls32768 --bsr16 --lazy --ohh	February 18, 2016 @ 09:28

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 @ 12:56.

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	51437	51442	51478	51440	51487	51445	51480	51482	51447	51482	51557	51561	51581	51464	51577
4	51360	51326	51358	51396	51420	51459	51388	51442	51425	51432	51425	51431	51442	51439	51426
6	51372	51338	51408	51334	51372	51391	51383	51407	51418	51287	51415	51448	51413	51412	51316
7	51348	51354	51385	51346	51432	51345	51401	51414	51444	51352	51410	51433	51421	51425	51357
8	51374	51346	51415	51417	51501	51378	51342	51431	51443	51308	51563	51442	51581	51412	51574
9	51356	51328	51387	51378	51416	51389	51415	51436	51431	51430	51407	51435	51414	51415	51310
10	51365	51340	51329	51392	51432	51378	51369	51431	51418	51334	51562	51445	51415	51417	51337
11	51341	51369	51365	51407	51378	51484	51495	51445	51428	51324	51436	51424	51415	51428	51334
12	51368	51331	51361	51418	51375	51399	51376	51453	51425	51333	51429	51422	51412	51410	51310
13	51351	51341	51382	51388	51377	51375	51421	51439	51438	51304	51407	51446	51423	51415	51311
14	51404	51380	51391	51421	51432	51380	51367	51425	51432	51318	51418	51424	51569	51421	51340
15	51341	51333	51331	51391	51374	51396	51377	51437	51434	51323	51439	51426	51414	51409	51335
16	51342	51368	51408	51377	51428	51340	51371	51437	51413	51329	51445	51447	51415	51402	51294
17	51344	51328	51394	51362	51436	51383	51364	51444	51422	51309	51418	51430	51420	51423	51338
18	51347	51327	51379	51417	51371	51432	51366	51431	51437	51315	51439	51433	51428	51419	51308
19	51344	51314	51406	51390	51441	51441	51363	51439	51427	51333	51434	51413	51411	51408	51312
20	51407	51464	51352	51410	51434	51447	51360	51437	51381	51321	51424	51438	51418	51404	51331
21	51359	51342	51349	51418	51430	51370	51416	51441	51442	51326	51411	51442	51424	51407	51338
22	51347	51351	51336	51408	51430	51403	51375	51440	51323	51319	51412	51409	51412	51408	51347
23	51343	51338	51378	51377	51430	51322	51352	51439	51439	51317	51418	51419	51412	51414	51340
25	51353	51372	51410	51413	51441	51381	51376	51436	51435	51331	51419	51423	51415	51408	51317
30	51346	51312	51403	51422	51434	51404	51383	51439	51433	51329	51419	51426	51413	51412	51309
40	51363	51336	51406	51418	51440	51369	51390	51436	51434	51317	51420	51410	51423	51406	51343

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	51316 bytes	–	100%
1,000	51299 bytes	-17 bytes	100%
10,000	51292 bytes	-7 bytes	100%
100,000	51290 bytes	-2 bytes	0.58%
1,000,000	51287 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)	51609 bytes	+322 bytes (+0.63%)	+261 bytes
1	51607 bytes	+320 bytes (+0.62%)	+259 bytes
2	51620 bytes	+333 bytes (+0.65%)	+272 bytes
3	51551 bytes	+264 bytes (+0.51%)	+203 bytes
4	51498 bytes	+211 bytes (+0.41%)	+150 bytes
5	51489 bytes	+202 bytes (+0.39%)	+141 bytes
6	51391 bytes	+104 bytes (+0.20%)	+43 bytes
7	51348 bytes	+61 bytes (+0.12%)	–
8	51373 bytes	+86 bytes (+0.17%)	+25 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	40942 bytes	-10345 bytes (-20.17%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	43535 bytes	-7752 bytes (-15.11%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	44600 bytes	-6687 bytes (-13.04%)
Brotli (Wikipedia)	brotli	brotli -q 11	46399 bytes	-4888 bytes (-9.53%)
LZMA2 (Wikipedia)	xz	xz -9	47036 bytes	-4251 bytes (-8.29%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	48988 bytes	-2299 bytes (-4.48%)
Zstandard (Wikipedia)	zstd	zstd -19	49596 bytes	-1691 bytes (-3.30%)

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.