D3 4.2.6 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 446400 bytes (435.9k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 212384 bytes (207.4k, 48%).

After GZIP compression these minified files vary in size:

Boot	81365 bytes (79.5k)	CDN
cdnjs	71956 bytes (70.3k)	CDN
gzip -6 (default)	71347 bytes (69.7k)	local copy
gzip -9	71106 bytes (69.4k)	local copy
libdeflate -12	68444 bytes (66.8k)	local copy
7zip -mx=9 -tgzip	67955 bytes (66.4k)	local copy
zultra	67772 bytes (66.2k)	local copy
kzip -s0 -rn -b8	67537 bytes (66.0k)	local copy
pigz -11 -n	67474 bytes (65.9k)	local copy
Zopfli	67403 bytes (65.8k)	local copy
Zopfli (defluff)	67402 bytes (65.8k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/d3/d3-4.2.6.min.js (or via HTTPS)

You will automatically get the smallest D3 4.2.6 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 4553 bytes by using my D3 4.2.6 Zopfli version instead of the best available CDN (6.75% smaller than cdnjs, 67403 vs. 71956 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 --mls512 --bsr8 --lazy --ohh

(found September 24, 2016)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	512	--mls512
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 (67402 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/v4.2.6/d3.zip --location | md5sum
a8d4667973aca44596df48c617bca8a7 -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-4.2.6.min.zopfli.js.gz | md5sum
a8d4667973aca44596df48c617bca8a7 -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/mbostock/d3/v4.2.6/d3.zip --location | sha1sum
25d845cbee289f6dfaf1e1b108e13e8792a30c86 -
curl --silent --compressed https://minime.stephan-brumme.com/files/d3/d3-4.2.6.min.zopfli.js.gz | sha1sum
25d845cbee289f6dfaf1e1b108e13e8792a30c86 -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	81365 bytes	a8d4667973aca44596df48c617bca8a7	September 25, 2016 @ 19:23
cdnjs	71956 bytes	a8d4667973aca44596df48c617bca8a7	September 22, 2016 @ 20:02

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
67403 bytes	-3 bytes	zopfli --i1000000 --mls512 --bsr8 --lazy --ohh	September 24, 2016 @ 04:06
67406 bytes	-5 bytes	zopfli --i100000 --mls512 --bsr8 --lazy --ohh	September 23, 2016 @ 16:59
67411 bytes	-5 bytes	zopfli --i10000 --mls512 --bsr8 --lazy --ohh	September 23, 2016 @ 15:43
67416 bytes	-23 bytes	zopfli --i1000 --mls512 --bsr8 --lazy --ohh	September 23, 2016 @ 15:18
67439 bytes	–	zopfli --i100 --mls512 --bsr8 --lazy --ohh	September 23, 2016 @ 15:13

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, 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	67649	67647	67722	67714	67711	67714	67706	67720	67756	67807	67822	67942	67951	67939	67562
4	67525	68331	68335	67534	67747	67646	67608	67600	67476	67528	67481	67436	67563	67590	67607
6	68300	68304	68315	68290	67573	67574	67501	67509	67509	67544	67437	67557	67503	67516	67622
7	67585	68298	67581	68306	68295	68294	67580	67575	67424	67479	67551	67489	67524	68303	67797
8	67678	67672	68280	68281	68286	67564	67571	67567	67403	67541	67570	67563	67614	67652	67596
9	67575	67556	67610	68286	68292	67568	68272	67536	67535	67549	67557	67601	67579	67580	68261
10	67537	67537	67590	68255	67560	68250	67539	67555	67544	67561	67584	67602	67626	67581	67592
11	67577	67588	67555	68255	67559	67556	67544	67548	67538	67554	67552	67558	67556	68271	68271
12	67545	67541	68253	67544	68263	67553	67543	67536	67550	67549	68273	67548	68288	67558	67576
13	67544	67557	68252	68271	68255	67541	67546	67534	68248	67539	67552	67555	67501	68273	68283
14	67547	67545	67551	68261	68252	68263	67552	67547	67539	67555	67551	67558	67499	67553	67598
15	67552	67582	68249	68252	68246	67556	67547	67557	67540	67549	67551	67566	67546	68283	67636
16	67542	67546	67555	68246	68248	67546	67565	67556	67562	67553	67562	67554	67578	67551	67625
17	67560	67545	68250	68245	68251	67552	67553	67546	67541	67541	67545	67562	67564	68269	68267
18	67531	67551	67540	68245	68247	67547	67552	67556	67544	67542	67576	67612	67579	67621	67584
19	67543	67549	67550	68254	68253	67552	67550	67541	67543	67550	67541	67557	67515	67553	68258
20	67542	67552	67541	68254	68247	67547	67557	67558	67539	67543	67566	68253	67515	67571	67589
21	67556	67550	67545	68249	67552	67543	67552	67550	67548	67540	67557	67557	67581	67613	67586
22	67540	67557	67551	68244	68256	67558	67539	67577	67543	67544	67552	67550	67560	67569	67586
23	67550	67552	67554	68278	68253	68251	67552	67551	68253	67541	67545	67560	67561	68273	67599
25	67550	67547	68255	68256	68286	68252	67548	67545	67544	67549	67562	67562	67505	67601	67589
30	67547	67553	68273	68254	68259	67556	67560	67548	67547	67571	67551	67582	67584	67594	67600
40	67548	67553	67586	68252	68253	67578	67571	67548	67545	67543	67537	67575	67636	67628	67598

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	67439 bytes	–	100%
1,000	67416 bytes	-23 bytes	100%
10,000	67411 bytes	-5 bytes	100%
100,000	67406 bytes	-5 bytes	1.16%
1,000,000	67403 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)	67551 bytes	+148 bytes (+0.22%)	+14 bytes
1	69014 bytes	+1611 bytes (+2.39%)	+1477 bytes
2	68877 bytes	+1474 bytes (+2.19%)	+1340 bytes
3	68500 bytes	+1097 bytes (+1.63%)	+963 bytes
4	67809 bytes	+406 bytes (+0.60%)	+272 bytes
5	67700 bytes	+297 bytes (+0.44%)	+163 bytes
6	67698 bytes	+295 bytes (+0.44%)	+161 bytes
7	67554 bytes	+151 bytes (+0.22%)	+17 bytes
8	67537 bytes	+134 bytes (+0.20%)	–

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	53403 bytes	-14000 bytes (-20.77%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	59376 bytes	-8027 bytes (-11.91%)
LZMA2 (Wikipedia)	xz	xz -9	60188 bytes	-7215 bytes (-10.70%)
Brotli (Wikipedia)	brotli	brotli -q 11	60293 bytes	-7110 bytes (-10.55%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	61650 bytes	-5753 bytes (-8.54%)
Zstandard (Wikipedia)	zstd	zstd -19	65477 bytes	-1926 bytes (-2.86%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	66801 bytes	-602 bytes (-0.89%)

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.