D3 3.2.4 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 308782 bytes (301.5k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 143524 bytes (140.2k, 46%).

After GZIP compression these minified files vary in size:

Boot	56163 bytes (54.8k)	CDN
Baidu	49066 bytes (47.9k)	CDN
cdnjs	49056 bytes (47.9k)	CDN
gzip -6 (default)	48655 bytes (47.5k)	local copy
unpkg	48585 bytes (47.4k)	CDN
gzip -9	48468 bytes (47.3k)	local copy
7zip -mx=9 -tgzip	46891 bytes (45.8k)	local copy
libdeflate -12	46886 bytes (45.8k)	local copy
zultra	46854 bytes (45.8k)	local copy
pigz -11 -n	46849 bytes (45.8k)	local copy
kzip -s0 -rn -b6	46700 bytes (45.6k)	local copy
Zopfli	46601 bytes (45.5k)	local copy
Zopfli (defluff)	46600 bytes (45.5k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/d3/d3-3.2.4.min.js (or via HTTPS)

You will automatically get the smallest D3 3.2.4 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 1984 bytes by using my D3 3.2.4 Zopfli version instead of the best available CDN (4.26% smaller than unpkg, 46601 vs. 48585 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 --i100000 --mb8 --mls512 --bsr13 --lazy --ohh

(found December 21, 2015)

Description	Value	Parameter
iterations	100000	--i100000
maximum blocks	8	--mb8
maximum length score	512	--mls512
block splitting recursion	13	--bsr13
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 1 more byte (46600 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/v3.2.4/d3.min.js --location | md5sum
315ac687c55c29404168cc2d731d60b4 -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-3.2.4.min.zopfli.js.gz | md5sum
315ac687c55c29404168cc2d731d60b4 -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/mbostock/d3/v3.2.4/d3.min.js --location | sha1sum
5d089e61886cdbb1f53670ae57a92f7b1553533c -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-3.2.4.min.zopfli.js.gz | sha1sum
5d089e61886cdbb1f53670ae57a92f7b1553533c -

These CDNs send you the original file:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	56163 bytes	315ac687c55c29404168cc2d731d60b4	(invalid)
cdnjs	49056 bytes	315ac687c55c29404168cc2d731d60b4	(invalid)
unpkg	48585 bytes	315ac687c55c29404168cc2d731d60b4	July 11, 2016 @ 16:32

And some CDNs send you a different file:

CDN	Size (compressed)	MD5 (uncompressed)	Comment / Diff	Timestamp
Baidu	49066 bytes	f307494590e3f18f6a6bfd0c917e7deb	only whitespaces differ	(invalid)

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
46601 bytes	-7 bytes	zopfli --i100000 --mls512 --bsr13 --lazy --ohh	December 21, 2015 @ 15:51
46608 bytes	-7 bytes	zopfli --i10000 --mls512 --bsr13 --lazy --ohh	November 23, 2015 @ 17:37
46615 bytes	-4 bytes	zopfli --i1000 --mls512 --bsr13 --lazy --ohh	September 20, 2015 @ 04:37
46619 bytes	–	zopfli --i100 --mls512 --bsr13 --lazy --ohh	September 18, 2015 @ 20:58

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 or 100,000.

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	46799	46800	46799	46805	46645	46653	46814	46810	46799	46710	46738	46790	46812	46743	46792
4	46807	46807	46687	46750	46761	46748	46819	46794	46795	46680	46715	46799	46814	46709	46808
6	46733	46812	46731	46621	46670	46751	46640	46745	46734	46622	46812	46794	46807	46704	46807
7	46791	46760	46804	46677	46652	46738	46755	46709	46748	46810	46811	46809	46783	46694	46787
8	46815	46806	46715	46645	46636	46634	46756	46756	46664	46619	46811	46789	46809	46699	46797
9	46669	46753	46812	46699	46645	46737	46758	46768	46790	46680	46695	46809	46798	46791	46799
10	46740	46727	46739	46750	46740	46768	46741	46755	46732	46812	46755	46726	46790	46717	46796
11	46667	46751	46817	46710	46759	46746	46751	46723	46756	46670	46692	46809	46786	46692	46792
12	46811	46801	46747	46698	46780	46756	46747	46646	46734	46626	46692	46800	46790	46796	46794
13	46746	46757	46804	46740	46662	46687	46683	46665	46601	46627	46695	46789	46796	46701	46799
14	46803	46794	46749	46683	46642	46765	46755	46764	46740	46622	46693	46788	46813	46696	46796
15	46723	46756	46768	46749	46764	46741	46746	46751	46768	46622	46749	46746	46814	46702	46794
16	46703	46696	46788	46742	46746	46741	46745	46743	46764	46622	46694	46803	46797	46688	46798
17	46678	46667	46809	46682	46794	46735	46786	46743	46745	46654	46696	46780	46790	46798	46795
18	46788	46693	46813	46699	46643	46757	46791	46795	46804	46631	46699	46781	46793	46694	46797
19	46671	46679	46768	46636	46641	46738	46746	46743	46797	46625	46696	46800	46797	46688	46795
20	46764	46762	46766	46741	46741	46746	46736	46739	46744	46651	46698	46732	46785	46697	46800
21	46745	46735	46744	46742	46745	46757	46762	46756	46774	46622	46764	46730	46790	46696	46800
22	46746	46733	46692	46635	46661	46736	46753	46743	46749	46627	46694	46750	46793	46706	46792
23	46666	46740	46755	46701	46657	46742	46746	46743	46733	46753	46696	46790	46796	46695	46800
25	46722	46744	46714	46744	46750	46739	46748	46744	46754	46621	46696	46749	46790	46699	46799
30	46787	46785	46734	46772	46752	46742	46757	46751	46728	46624	46691	46732	46809	46679	46797
40	46712	46742	46704	46703	46647	46738	46736	46758	46761	46624	46693	46630	46797	46696	46792

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	46619 bytes	–	100%
1,000	46615 bytes	-4 bytes	100%
10,000	46608 bytes	-7 bytes	100%
100,000	46601 bytes	-7 bytes	0.29%
1,000,000	–	–	–
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)	46818 bytes	+217 bytes (+0.47%)	+118 bytes
1	46829 bytes	+228 bytes (+0.49%)	+129 bytes
2	46817 bytes	+216 bytes (+0.46%)	+117 bytes
3	46784 bytes	+183 bytes (+0.39%)	+84 bytes
4	46805 bytes	+204 bytes (+0.44%)	+105 bytes
5	46758 bytes	+157 bytes (+0.34%)	+58 bytes
6	46700 bytes	+99 bytes (+0.21%)	–
7	46729 bytes	+128 bytes (+0.27%)	+29 bytes
8	46726 bytes	+125 bytes (+0.27%)	+26 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	37464 bytes	-9137 bytes (-19.61%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	39694 bytes	-6907 bytes (-14.82%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	40306 bytes	-6295 bytes (-13.51%)
Brotli (Wikipedia)	brotli	brotli -q 11	42220 bytes	-4381 bytes (-9.40%)
LZMA2 (Wikipedia)	xz	xz -9	42960 bytes	-3641 bytes (-7.81%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	44827 bytes	-1774 bytes (-3.81%)
Zstandard (Wikipedia)	zstd	zstd -19	45018 bytes	-1583 bytes (-3.40%)

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.