D3 3.2.8 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 309461 bytes (302.2k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 143169 bytes (139.8k, 46%).

After GZIP compression these minified files vary in size:

Boot	56291 bytes (55.0k)	CDN
jsdelivr	56291 bytes (55.0k)	CDN
Baidu	49310 bytes (48.2k)	CDN
cdnjs	49300 bytes (48.1k)	CDN
gzip -6 (default)	48920 bytes (47.8k)	local copy
unpkg	48896 bytes (47.8k)	CDN
gzip -9	48737 bytes (47.6k)	local copy
zultra	47189 bytes (46.1k)	local copy
libdeflate -12	47145 bytes (46.0k)	local copy
7zip -mx=9 -tgzip	47128 bytes (46.0k)	local copy
pigz -11 -n	46898 bytes (45.8k)	local copy
kzip -s0 -rn -b6	46893 bytes (45.8k)	local copy
Zopfli	46798 bytes (45.7k)	local copy
Zopfli (defluff)	46797 bytes (45.7k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/d3/d3-3.2.8.min.js (or via HTTPS)

You will automatically get the smallest D3 3.2.8 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 2098 bytes by using my D3 3.2.8 Zopfli version instead of the best available CDN (4.48% smaller than unpkg, 46798 vs. 48896 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 --mls128 --bsr8 --lazy --ohh

(found December 21, 2015)

Description	Value	Parameter
iterations	100000	--i100000
maximum blocks	8	--mb8
maximum length score	128	--mls128
block splitting recursion	8	--bsr8
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 (46797 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/v3.2.8/d3.min.js --location | md5sum
5db72951d2ee027b0536fe8b19928762 -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-3.2.8.min.zopfli.js.gz | md5sum
5db72951d2ee027b0536fe8b19928762 -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/mbostock/d3/v3.2.8/d3.min.js --location | sha1sum
8c20d53ba2c073a0b939b06847f12204ba0f81c6 -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-3.2.8.min.zopfli.js.gz | sha1sum
8c20d53ba2c073a0b939b06847f12204ba0f81c6 -

These CDNs send you the original file:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	56291 bytes	5db72951d2ee027b0536fe8b19928762	(invalid)
jsdelivr	56291 bytes	5db72951d2ee027b0536fe8b19928762	(invalid)
cdnjs	49300 bytes	5db72951d2ee027b0536fe8b19928762	(invalid)
unpkg	48896 bytes	5db72951d2ee027b0536fe8b19928762	July 11, 2016 @ 16:32

And some CDNs send you a different file:

CDN	Size (compressed)	MD5 (uncompressed)	Comment / Diff	Timestamp
Baidu	49310 bytes	3ae7d4aacc68ee40d0f5b6b778705563	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
46798 bytes	-5 bytes	zopfli --i100000 --mls128 --bsr8 --lazy --ohh	December 21, 2015 @ 16:36
46803 bytes	-6 bytes	zopfli --i10000 --mls128 --bsr8 --lazy --ohh	October 14, 2015 @ 03:09
46809 bytes	-3 bytes	zopfli --i1000 --mls128 --bsr8 --lazy --ohh	September 20, 2015 @ 01:33
46812 bytes	-1 byte	zopfli --i1000 --mls8 --bsr16 --lazy --ohh	September 20, 2015 @ 01:18
46813 bytes	-7 bytes	zopfli --i1000 --mls8 --bsr7 --lazy --ohh	September 20, 2015 @ 01:14
46820 bytes	–	zopfli --i100 --mls128 --bsr8 --lazy --ohh	September 18, 2015 @ 21:03

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 @ 12:47.

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	46962	46911	46959	46980	46916	46927	46903	46965	46881	47046	46896	47068	47091	46936	47072
4	46896	46920	46912	46903	46900	46869	46859	46841	46840	46852	46847	46852	47094	46837	46898
6	46853	46849	46867	46872	46836	46916	46843	46875	46826	46839	46826	46822	47066	46891	46874
7	46850	46837	46809	46885	46891	46856	46845	46847	46850	46857	46841	46833	47075	46919	46815
8	46864	46866	46955	46842	46870	46871	46798	46900	46841	46847	46857	46842	47087	46938	46927
9	46855	46875	46844	46890	46822	46857	46869	46899	46843	46838	46833	46844	47089	46855	46833
10	46852	46859	46856	46857	46839	46820	46835	46835	46832	46833	47010	46990	47074	46937	46841
11	46913	46859	46848	46894	46850	46855	46869	46871	46831	46828	46828	46802	47067	46916	46824
12	46847	46896	46821	46894	46826	46883	46876	46869	46825	46832	46831	46807	47076	46924	46888
13	46830	46855	46863	46879	46863	46859	46880	46872	46837	46831	46831	46826	47078	46916	46827
14	46837	46853	46867	46860	46843	46833	46840	46834	46836	46836	46845	46812	47070	46871	46871
15	46830	46898	46861	46856	46847	46881	46832	46883	46827	46832	46840	46822	47094	46877	46839
16	46875	46849	46802	46897	46815	46873	46877	46884	46843	46832	46846	46816	47076	46842	46835
17	46900	46860	46834	46885	46829	46839	46879	46853	46828	46835	46835	46822	47076	46878	46859
18	46851	46860	46857	46862	46861	46832	46860	46874	46836	46833	46842	46823	47097	46889	46808
19	46856	46891	46847	46858	46840	46876	46882	46885	46841	46832	46839	46808	47080	46879	46855
20	46905	46837	46865	46883	46835	46843	46830	46869	46842	46829	46825	46815	47076	46867	46890
21	46907	46904	46846	46858	46876	46833	46868	46888	46832	46837	46828	46818	47076	46841	46848
22	46839	46848	46873	46850	46840	46841	46866	46857	46845	46831	46830	46828	47092	46862	46857
23	46852	46848	46885	46881	46865	46869	46831	46864	46836	46831	46827	46825	47070	46861	46860
25	46905	46853	46841	46843	46844	46869	46844	46890	46873	46832	46833	46831	47078	46821	46858
30	46843	46881	46823	46845	46812	46851	46858	46885	46856	46886	46830	46802	47077	46828	46828
40	46832	46850	46872	46849	46858	46856	46850	46860	46828	46831	46832	46811	47081	46907	46864

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	46820 bytes	–	100%
1,000	46809 bytes	-11 bytes	100%
10,000	46803 bytes	-6 bytes	100%
100,000	46798 bytes	-5 bytes	1.16%
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)	47033 bytes	+235 bytes (+0.50%)	+140 bytes
1	47125 bytes	+327 bytes (+0.70%)	+232 bytes
2	47116 bytes	+318 bytes (+0.68%)	+223 bytes
3	47030 bytes	+232 bytes (+0.50%)	+137 bytes
4	47035 bytes	+237 bytes (+0.51%)	+142 bytes
5	46971 bytes	+173 bytes (+0.37%)	+78 bytes
6	46893 bytes	+95 bytes (+0.20%)	–
7	46925 bytes	+127 bytes (+0.27%)	+32 bytes
8	46927 bytes	+129 bytes (+0.28%)	+34 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	37515 bytes	-9283 bytes (-19.84%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	39696 bytes	-7102 bytes (-15.18%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	40300 bytes	-6498 bytes (-13.89%)
Brotli (Wikipedia)	brotli	brotli -q 11	42303 bytes	-4495 bytes (-9.61%)
LZMA2 (Wikipedia)	xz	xz -9	43036 bytes	-3762 bytes (-8.04%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	44883 bytes	-1915 bytes (-4.09%)
Zstandard (Wikipedia)	zstd	zstd -19	45301 bytes	-1497 bytes (-3.20%)

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.