Choose a version:
13% The original file has 533420 bytes (520.9k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 71368 bytes (69.7k, 13%).

After GZIP compression these minified files vary in size:
Boot
  28160 bytes (27.5k)
CDN
cdnjs
  25145 bytes (24.6k)
CDN
cdnhttps
  24932 bytes (24.3k)
CDN
unpkg
  23789 bytes (23.2k)
CDN
gzip -6 (default)
  23738 bytes (23.2k)
local copy
jsdelivr
  23681 bytes (23.1k)
CDN
gzip -9
  23674 bytes (23.1k)
local copy
libdeflate -12
  22871 bytes (22.3k)
local copy
7zip -mx=9 -tgzip
  22862 bytes (22.3k)
local copy
kzip -s0 -rn -b6
  22790 bytes (22.3k)
local copy
pigz -11 -n
  22742 bytes (22.2k)
local copy
Zopfli
  22711 bytes (22.2k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/lodash/lodash-4.16.2.min.js

You will automatically get the smallest lodash 4.16.2 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 970 bytes by using my lodash 4.16.2 Zopfli version instead of the best available CDN (4.27% smaller than jsdelivr, 22711 vs. 23681 bytes):
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 --mls4096 --bsr22 --lazy --ohh

(found September 26, 2016)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 4096  --mls4096
block splitting recursion 22  --bsr22
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

Verify file integrity

After decompression, my uncompressed files are identical to the original ones:

MD5:
curl --silent --compressed https://raw.githubusercontent.com/lodash/lodash/4.16.2/dist/lodash.min.js --location | md5sum
7271c09c2dbd9a7be40f34ff40a93e6e  -
curl --silent --compressed http://minime.stephan-brumme.com/files/lodash/lodash-4.16.2.min.zopfli.js.gz | md5sum
7271c09c2dbd9a7be40f34ff40a93e6e  -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/lodash/lodash/4.16.2/dist/lodash.min.js --location | sha1sum
e17cc98dc021c1a66f2d61774d544f3b03506bfa  -
curl --silent --compressed http://minime.stephan-brumme.com/files/lodash/lodash-4.16.2.min.zopfli.js.gz | sha1sum
e17cc98dc021c1a66f2d61774d544f3b03506bfa  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
unpkg 23789 bytes 7271c09c2dbd9a7be40f34ff40a93e6e September 26, 2016 @ 08:02
jsdelivr 23681 bytes 7271c09c2dbd9a7be40f34ff40a93e6e (invalid)

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
Boot 28160 bytes 0825fc13f8bd0393119879e40215af56 < /**
< * @license
< * lodash lodash.com/license | Underscore.js 1.8.3 undersc [...]
< */
< ;(function(){function t(t,n){return t.set(n[0],n[1]),t}fun [...]
< return t}function o(t,n){for(var r=-1,e=t?t.length:0;++r<e [...]
< var u=-1,i=t?t.length:0;for(e&&i&&(r=t[++u]);++u<i;)r=n(r, [...]
< break t}t=-1}else t=g(t,b,r);return t}function y(t,n,r,e){ [...]
< var i=n(t[e]);i!==F&&(r=r===F?i:r+i)}return r}function E(t [...]
< return t.forEach(function(t,e){r[++n]=[e,t]}),r}function U [...]
[...]
September 30, 2016 @ 05:45
cdnjs 25145 bytes 0825fc13f8bd0393119879e40215af56 < /**
< * @license
< * lodash lodash.com/license | Underscore.js 1.8.3 undersc [...]
< */
< ;(function(){function t(t,n){return t.set(n[0],n[1]),t}fun [...]
< return t}function o(t,n){for(var r=-1,e=t?t.length:0;++r<e [...]
< var u=-1,i=t?t.length:0;for(e&&i&&(r=t[++u]);++u<i;)r=n(r, [...]
< break t}t=-1}else t=g(t,b,r);return t}function y(t,n,r,e){ [...]
< var i=n(t[e]);i!==F&&(r=r===F?i:r+i)}return r}function E(t [...]
< return t.forEach(function(t,e){r[++n]=[e,t]}),r}function U [...]
[...]
(invalid)
cdnhttps 24932 bytes 0825fc13f8bd0393119879e40215af56 < /**
< * @license
< * lodash lodash.com/license | Underscore.js 1.8.3 undersc [...]
< */
< ;(function(){function t(t,n){return t.set(n[0],n[1]),t}fun [...]
< return t}function o(t,n){for(var r=-1,e=t?t.length:0;++r<e [...]
< var u=-1,i=t?t.length:0;for(e&&i&&(r=t[++u]);++u<i;)r=n(r, [...]
< break t}t=-1}else t=g(t,b,r);return t}function y(t,n,r,e){ [...]
< var i=n(t[e]);i!==F&&(r=r===F?i:r+i)}return r}function E(t [...]
< return t.forEach(function(t,e){r[++n]=[e,t]}),r}function U [...]
[...]
November 22, 2016 @ 16:35

Note: only the MD5 hashes are shown to keep things simple.

Other Versions

Available lodash versions at minime.stephan-brumme.com:

4.17.5, 4.17.4, 4.17.3, 4.17.2, 4.17.1, 4.17.0, 4.16.6, 4.16.5, 4.16.4, 4.16.3, 4.16.2, 4.16.1, 4.16.0, 4.15.0, 4.14.2, 4.14.1, 4.14.0, 4.13.1, 4.13.0, 4.12.0, 4.11.2, 4.11.1, 4.11.0, 4.10.0,
4.9.0, 4.8.2, 4.8.1, 4.8.0, 4.7.0, 4.6.1, 4.6.0, 4.5.1, 4.5.0, 4.4.0, 4.3.0, 4.2.1, 4.2.0, 4.1.0, 4.0.1, 4.0.0

The project site contains an overview how well these versions were compressed.
Other interesting projects are AngularJS, BackboneJS, Bootstrap, D3, Dojo, Ember, jQuery, Knockout, React, Socket.IO, ThreeJS, UnderscoreJS and Vue.

Changelog

Best Zopfli parameters so far:
Size Improvement Parameters Found
22711 bytes -2 bytes zopfli --i100000 --mls4096 --bsr22 --lazy --ohh September 26, 2016 @ 09:16
22713 bytes -1 byte zopfli --i100000 --mls8 --bsr8 --lazy --ohh September 26, 2016 @ 08:45
22714 bytes -1 byte zopfli --i10000 --mls8 --bsr8 --lazy --ohh September 26, 2016 @ 08:13
22715 bytes -1 byte zopfli --i1000 --mls8 --bsr8 --lazy --ohh September 26, 2016 @ 08:09
22716 bytes -2 bytes zopfli --i1000 --mls4096 --bsr23 --lazy --ohh September 26, 2016 @ 08:06
22718 bytes -4 bytes zopfli --i1000 --mls8192 --bsr6 --lazy --ohh September 26, 2016 @ 08:06
22722 bytes zopfli --i100 --mls8192 --bsr6 --lazy --ohh September 26, 2016 @ 08:03

If there are multiple parameter sets yielding the same compressed size, only the first one found is shown.

Most recent activity on November 22, 2016 @ 16:35.

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
22760 22756 22753 22748 22744 22762 22757 22760 22761 22762 22746 22757 22748 22746 22775
22753 22750 22753 22752 22740 22752 22753 22759 22739 22739 22756 22739 22735 22737 22741
22724 22723 22738 22724 22754 22726 22728 22727 22726 22721 22725 22725 22717 22734 22722
22724 22717 22713 22722 22726 22723 22729 22726 22727 22719 22724 22724 22723 22721 22723
22726 22728 22713 22736 22732 22726 22736 22723 22727 22720 22723 22716 22722 22733 22735
22725 22726 22721 22739 22738 22733 22728 22734 22722 22722 22722 22729 22741 22749 22734
22723 22723 22723 22723 22723 22722 22723 22738 22735 22735 22729 22720 22722 22723 22724
22724 22717 22713 22723 22731 22726 22727 22735 22714 22723 22722 22713 22721 22734 22722
22726 22717 22717 22723 22724 22726 22723 22729 22723 22720 22721 22714 22721 22721 22721
22723 22728 22717 22725 22730 22728 22727 22726 22712 22720 22722 22724 22722 22735 22722
22725 22723 22717 22737 22722 22727 22726 22726 22726 22721 22723 22717 22724 22734 22734
22723 22724 22728 22722 22722 22722 22727 22723 22723 22714 22716 22716 22724 22716 22724
22729 22727 22716 22735 22736 22726 22717 22726 22723 22713 22721 22713 22736 22733 22722
22723 22723 22717 22722 22730 22726 22727 22726 22727 22724 22721 22713 22722 22737 22735
22723 22727 22719 22723 22731 22724 22733 22731 22726 22720 22725 22722 22723 22722 22721
22727 22725 22714 22736 22732 22726 22726 22726 22728 22720 22722 22712 22723 22734 22734
22724 22732 22713 22726 22731 22723 22726 22731 22716 22722 22723 22714 22722 22735 22721
22724 22727 22716 22722 22748 22724 22727 22726 22716 22721 22724 22714 22723 22722 22721
22733 22728 22717 22723 22733 22731 22728 22730 22722 22721 22721 22711 22722 22722 22736
22723 22724 22716 22726 22732 22721 22724 22723 22726 22720 22724 22714 22721 22734 22720
22739 22725 22717 22730 22727 22726 22738 22736 22726 22721 22721 22716 22720 22733 22721
22726 22722 22720 22729 22730 22726 22727 22724 22724 22719 22721 22716 22721 22723 22736
22724 22722 22717 22723 22724 22724 22727 22729 22713 22720 22722 22719 22725 22724 22723

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 22722 bytes 100%
1,000 22715 bytes -7 bytes 100%
10,000 22714 bytes -1 byte 100%
100,000 22711 bytes -3 bytes 5.51%
1,000,000 22711 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
22808 bytes +97 bytes (+0.43%) +18 bytes
22957 bytes +246 bytes (+1.08%) +167 bytes
22840 bytes +129 bytes (+0.57%) +50 bytes
22842 bytes +131 bytes (+0.58%) +52 bytes
22836 bytes +125 bytes (+0.55%) +46 bytes
22808 bytes +97 bytes (+0.43%) +18 bytes
22790 bytes +79 bytes (+0.35%)
22820 bytes +109 bytes (+0.48%) +30 bytes
22840 bytes +129 bytes (+0.57%) +50 bytes

Non-DEFLATE Algorithms

Archivers based on completely different compression algorithms often produce superior results.
Unfortunately, browsers only support gzip compression at the moment.
Algorithm Program Parameters Size Compared To Best Zopfli
ZPAQ (Wikipedia) zpaq zpaq -method 69 19144 bytes -3567 bytes (-15.71%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 19713 bytes -2998 bytes (-13.20%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 20450 bytes -2261 bytes (-9.96%)
Brotli (Wikipedia) brotli brotli -q 11 21250 bytes -1461 bytes (-6.43%)
LZMA2 (Wikipedia) xz xz -9 21724 bytes -987 bytes (-4.35%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 22057 bytes -654 bytes (-2.88%)
ZSTD (Wikipedia) zstd zstd -19 22573 bytes -138 bytes (-0.61%)

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):


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 2018.
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