D3 3.0.7 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 268323 bytes (262.0k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 126718 bytes (123.7k, 47%).

After GZIP compression these minified files vary in size:

Boot	48747 bytes (47.6k)	CDN
Baidu	42653 bytes (41.7k)	CDN
cdnjs	42643 bytes (41.6k)	CDN
gzip -6 (default)	42308 bytes (41.3k)	local copy
unpkg	42268 bytes (41.3k)	CDN
gzip -9	42186 bytes (41.2k)	local copy
7zip -mx=9 -tgzip	40817 bytes (39.9k)	local copy
libdeflate -12	40775 bytes (39.8k)	local copy
zultra	40775 bytes (39.8k)	local copy
pigz -11 -n	40763 bytes (39.8k)	local copy
kzip -s0 -rn -b8	40683 bytes (39.7k)	local copy
Zopfli	40557 bytes (39.6k)	local copy
Zopfli (defluff)	40556 bytes (39.6k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/d3/d3-3.0.7.min.js (or via HTTPS)

You will automatically get the smallest D3 3.0.7 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 1711 bytes by using my D3 3.0.7 Zopfli version instead of the best available CDN (4.22% smaller than unpkg, 40557 vs. 42268 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 --mls16 --bsr13 --lazy --ohh

(found December 21, 2015)

Description	Value	Parameter
iterations	100000	--i100000
maximum blocks	8	--mb8
maximum length score	16	--mls16
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 (40556 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/v3.0.7/d3.min.js --location | md5sum
6963117481486a82039dbcc010708729 -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-3.0.7.min.zopfli.js.gz | md5sum
6963117481486a82039dbcc010708729 -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/mbostock/d3/v3.0.7/d3.min.js --location | sha1sum
8c1331d57687b27b1a2f5d148d813d79b2753c4d -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-3.0.7.min.zopfli.js.gz | sha1sum
8c1331d57687b27b1a2f5d148d813d79b2753c4d -

These CDNs send you the original file:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	48747 bytes	6963117481486a82039dbcc010708729	(invalid)
cdnjs	42643 bytes	6963117481486a82039dbcc010708729	(invalid)
unpkg	42268 bytes	6963117481486a82039dbcc010708729	July 11, 2016 @ 16:32

And some CDNs send you a different file:

CDN	Size (compressed)	MD5 (uncompressed)	Comment / Diff	Timestamp
Baidu	42653 bytes	b1c7c6de336e09138e7c7e520cefc5e0	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
40557 bytes	-7 bytes	zopfli --i100000 --mls16 --bsr13 --lazy --ohh	December 21, 2015 @ 12:16
40564 bytes	-5 bytes	zopfli --i10000 --mls16 --bsr13 --lazy --ohh	November 23, 2015 @ 17:14
40569 bytes	-3 bytes	zopfli --i1000 --mls16 --bsr13 --lazy --ohh	September 20, 2015 @ 16:57
40572 bytes	-11 bytes	zopfli --i1000 --mls16 --bsr11 --lazy --ohh	September 20, 2015 @ 16:56
40583 bytes	–	zopfli --i100 --mls16 --bsr13 --lazy --ohh	September 18, 2015 @ 20:19

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	40730	40676	40723	40729	40731	40694	40694	40728	40728	40755	40755	40671	40756	40761	40758
4	40632	40673	40581	40729	40727	40723	40709	40717	40725	40757	40757	40723	40760	40734	40755
6	40722	40615	40732	40722	40728	40613	40594	40733	40735	40749	40760	40606	40755	40661	40763
7	40721	40726	40640	40678	40736	40728	40716	40719	40724	40747	40748	40614	40761	40722	40627
8	40638	40707	40579	40670	40651	40736	40632	40577	40729	40756	40757	40624	40754	40743	40742
9	40721	40724	40733	40731	40730	40638	40601	40605	40631	40746	40628	40747	40757	40660	40624
10	40609	40675	40587	40592	40643	40638	40607	40618	40657	40748	40748	40632	40755	40641	40751
11	40566	40610	40605	40569	40620	40612	40612	40642	40670	40748	40746	40619	40765	40663	40632
12	40736	40569	40601	40606	40615	40632	40578	40630	40677	40759	40746	40620	40753	40760	40742
13	40586	40594	40619	40557	40593	40598	40593	40625	40599	40748	40745	40745	40754	40756	40757
14	40638	40614	40574	40586	40596	40603	40604	40595	40650	40624	40756	40620	40755	40615	40759
15	40734	40600	40602	40573	40594	40713	40606	40606	40737	40748	40625	40610	40755	40628	40631
16	40598	40580	40601	40598	40595	40598	40604	40601	40659	40747	40759	40746	40757	40731	40751
17	40632	40623	40569	40596	40595	40630	40597	40592	40653	40747	40747	40619	40755	40650	40626
18	40602	40627	40610	40735	40577	40634	40620	40631	40726	40755	40748	40621	40756	40753	40626
19	40630	40599	40595	40735	40594	40734	40592	40602	40648	40612	40624	40622	40755	40639	40747
20	40591	40602	40603	40735	40603	40598	40600	40627	40653	40749	40744	40746	40757	40643	40744
21	40561	40605	40602	40602	40636	40634	40605	40614	40650	40747	40622	40743	40757	40636	40743
22	40601	40599	40602	40730	40599	40723	40616	40606	40726	40748	40756	40637	40757	40750	40747
23	40736	40627	40732	40664	40601	40597	40598	40614	40656	40756	40746	40746	40756	40630	40751
25	40732	40596	40579	40570	40594	40609	40599	40595	40668	40747	40756	40747	40754	40751	40752
30	40733	40598	40595	40733	40642	40635	40591	40728	40665	40747	40628	40620	40757	40654	40743
40	40585	40607	40731	40734	40728	40635	40608	40619	40632	40747	40758	40619	40755	40653	40742

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	40578 bytes	–	100%
1,000	40569 bytes	-9 bytes	100%
10,000	40564 bytes	-5 bytes	100%
100,000	40557 bytes	-7 bytes	0.58%
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)	40769 bytes	+212 bytes (+0.52%)	+86 bytes
1	40777 bytes	+220 bytes (+0.54%)	+94 bytes
2	40764 bytes	+207 bytes (+0.51%)	+81 bytes
3	40776 bytes	+219 bytes (+0.54%)	+93 bytes
4	40779 bytes	+222 bytes (+0.55%)	+96 bytes
5	40801 bytes	+244 bytes (+0.60%)	+118 bytes
6	40792 bytes	+235 bytes (+0.58%)	+109 bytes
7	40774 bytes	+217 bytes (+0.54%)	+91 bytes
8	40683 bytes	+126 bytes (+0.31%)	–

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	32861 bytes	-7696 bytes (-18.98%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	34680 bytes	-5877 bytes (-14.49%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	36129 bytes	-4428 bytes (-10.92%)
Brotli (Wikipedia)	brotli	brotli -q 11	36883 bytes	-3674 bytes (-9.06%)
LZMA2 (Wikipedia)	xz	xz -9	37664 bytes	-2893 bytes (-7.13%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	39235 bytes	-1322 bytes (-3.26%)
Zstandard (Wikipedia)	zstd	zstd -19	39320 bytes	-1237 bytes (-3.05%)

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.