D3 5.1.0 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 493246 bytes (481.7k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 235672 bytes (230.1k, 48%).

After GZIP compression these minified files vary in size:

unpkg	89296 bytes (87.2k)	CDN
Boot	78301 bytes (76.5k)	CDN
cdnjs	78301 bytes (76.5k)	CDN
gzip -6 (default)	77772 bytes (75.9k)	local copy
gzip -9	77514 bytes (75.7k)	local copy
libdeflate -12	74141 bytes (72.4k)	local copy
7zip -mx=9 -tgzip	74018 bytes (72.3k)	local copy
zultra	73770 bytes (72.0k)	local copy
pigz -11 -n	73500 bytes (71.8k)	local copy
kzip -s0 -rn -b8	73471 bytes (71.7k)	local copy
Zopfli	73458 bytes (71.7k)	local copy
Zopfli (defluff)	73456 bytes (71.7k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/d3/d3-5.1.0.min.js (or via HTTPS)

You will automatically get the smallest D3 5.1.0 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 4843 bytes by using my D3 5.1.0 Zopfli version instead of the best available CDN (6.59% smaller than cdnjs, 73458 vs. 78301 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 April 25, 2018)

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

Even Smaller Files Thanks To Defluff

Zopfli's output can be further optimized by the defluff tool.
In this particular case, defluff saves 2 more bytes (73456 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/v5.1.0/d3.zip --location | md5sum
58c4db79af8ab035d60c1995027093e4 -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-5.1.0.min.zopfli.js.gz | md5sum
58c4db79af8ab035d60c1995027093e4 -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/mbostock/d3/v5.1.0/d3.zip --location | sha1sum
3255f0f3fdb3cde2be73e5b0eda8d0a54c0f05a7 -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-5.1.0.min.zopfli.js.gz | sha1sum
3255f0f3fdb3cde2be73e5b0eda8d0a54c0f05a7 -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
unpkg	89296 bytes	58c4db79af8ab035d60c1995027093e4	April 17, 2018 @ 22:54
Boot	78301 bytes	58c4db79af8ab035d60c1995027093e4	July 2, 2018 @ 18:58
cdnjs	78301 bytes	58c4db79af8ab035d60c1995027093e4	July 2, 2018 @ 19:00

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
73458 bytes	-3 bytes	zopfli --i1000000 --mls1024 --bsr6 --lazy --ohh	April 25, 2018 @ 22:55
73461 bytes	-8 bytes	zopfli --i100000 --mls1024 --bsr6 --lazy --ohh	April 24, 2018 @ 21:27
73469 bytes	-18 bytes	zopfli --i10000 --mls1024 --bsr6 --lazy --ohh	April 23, 2018 @ 15:49
73487 bytes	-9 bytes	zopfli --i1000 --mls1024 --bsr6 --lazy --ohh	April 23, 2018 @ 09:59
73496 bytes	–	zopfli --i100 --mls1024 --bsr6 --lazy --ohh	April 23, 2018 @ 09:12

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 @ 12:53.

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	73779	73913	73944	74133	74133	73916	73980	73854	73982	74017	74146	74079	74085	73815	73836
4	74158	74148	74193	74191	74187	74190	74187	73778	73808	74174	73688	73666	73805	73816	73818
6	73637	73627	73601	73596	73586	73621	73617	73611	73622	73458	73658	73734	73591	73640	73740
7	73649	73647	73660	73650	73735	73675	73744	73752	73785	73608	73688	73836	73817	73784	73739
8	73607	73623	73591	73596	73738	73734	73601	73618	73598	73615	73604	73580	73593	73590	73744
9	73644	73642	73702	73641	73732	73632	73635	73696	73667	73754	73719	73665	73657	73662	73790
10	73662	73669	73590	73592	73611	73592	73608	73613	73738	73776	73675	73842	73617	73919	73867
11	73619	73651	73631	73558	73695	73750	73751	73751	73748	73750	73773	73779	73689	73584	73786
12	73586	73578	73672	73640	73644	73648	73647	73655	73595	73614	73744	73578	73605	73732	73734
13	73629	73630	73584	73605	73608	73599	73613	73616	73597	73739	73737	73777	73778	73780	73741
14	73611	73620	73585	73578	73594	73597	73610	73611	73583	73622	73589	73583	73592	73565	73594
15	73646	73652	73650	73578	73696	73603	73765	73627	73750	73635	73663	73767	73776	73557	73741
16	73657	73657	73556	73558	73562	73592	73638	73608	73599	73619	73610	73631	73578	73740	73743
17	73640	73642	73581	73582	73589	73595	73613	73642	73591	73621	73704	73579	73583	73746	73739
18	73650	73623	73641	73620	73627	73583	73696	73624	73670	73619	73481	73592	73597	73881	73739
19	73622	73616	73591	73589	73593	73595	73598	73622	73611	73615	73603	73584	73581	73584	73754
20	73646	73632	73649	73659	73599	73624	73694	73628	73680	73760	73665	73583	73610	73602	73569
21	73634	73637	73585	73586	73591	73594	73609	73610	73597	73623	73775	73778	73621	73902	73753
22	73641	73641	73595	73590	73598	73598	73638	73663	73598	73667	73769	73770	73604	73745	73583
23	73636	73623	73629	73635	73634	73635	73633	73638	73594	73750	73771	73666	73610	73582	73751
25	73614	73585	73587	73585	73594	73596	73611	73614	73596	73603	73770	73575	73755	73744	73738
30	73619	73629	73580	73585	73608	73596	73608	73611	73594	73622	73663	73774	73605	73766	73758
40	73619	73617	73591	73590	73612	73596	73619	73615	73595	73615	73766	73770	73590	73587	73740

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	73496 bytes	–	100%
1,000	73487 bytes	-9 bytes	100%
10,000	73469 bytes	-18 bytes	100%
100,000	73461 bytes	-8 bytes	1.16%
1,000,000	73458 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)	73686 bytes	+228 bytes (+0.31%)	+215 bytes
1	75198 bytes	+1740 bytes (+2.37%)	+1727 bytes
2	75029 bytes	+1571 bytes (+2.14%)	+1558 bytes
3	73857 bytes	+399 bytes (+0.54%)	+386 bytes
4	73831 bytes	+373 bytes (+0.51%)	+360 bytes
5	73800 bytes	+342 bytes (+0.47%)	+329 bytes
6	73690 bytes	+232 bytes (+0.32%)	+219 bytes
7	73500 bytes	+42 bytes (+0.06%)	+29 bytes
8	73471 bytes	+13 bytes (+0.02%)	–

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	57610 bytes	-15848 bytes (-21.57%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	63951 bytes	-9507 bytes (-12.94%)
LZMA2 (Wikipedia)	xz	xz -9	64892 bytes	-8566 bytes (-11.66%)
Brotli (Wikipedia)	brotli	brotli -q 11	65092 bytes	-8366 bytes (-11.39%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	67029 bytes	-6429 bytes (-8.75%)
Zstandard (Wikipedia)	zstd	zstd -19	70713 bytes	-2745 bytes (-3.74%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	72525 bytes	-933 bytes (-1.27%)

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.