Choose a version:
13% The original file has 523006 bytes (510.7k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 69112 bytes (67.5k, 13%).

After GZIP compression these minified files vary in size:
Boot
  27258 bytes (26.6k)
CDN
cdnjs
  24196 bytes (23.6k)
CDN
cdnhttps
  23906 bytes (23.3k)
CDN
gzip -6 (default)
  23018 bytes (22.5k)
local copy
unpkg
  22986 bytes (22.4k)
CDN
jsdelivr
  22955 bytes (22.4k)
CDN
gzip -9
  22945 bytes (22.4k)
local copy
libdeflate -12
  22282 bytes (21.8k)
local copy
7zip -mx=9 -tgzip
  22229 bytes (21.7k)
local copy
kzip -s0 -rn -b4
  22217 bytes (21.7k)
local copy
pigz -11 -n
  22179 bytes (21.7k)
local copy
Zopfli
  22141 bytes (21.6k)
local copy
Zopfli (defluff)
  22140 bytes (21.6k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/lodash/lodash-4.14.2.min.js (or via HTTPS)

You will automatically get the smallest lodash 4.14.2 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 814 bytes by using my lodash 4.14.2 Zopfli version instead of the best available CDN (3.68% smaller than jsdelivr, 22141 vs. 22955 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 --i1000000 --mb8 --mls8 --bsr4 --lazy --ohh

(found August 9, 2016)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 8  --mls8
block splitting recursion 4  --bsr4
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 (22140 bytes).

Verify file integrity

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

MD5:
curl --silent --compressed https://raw.githubusercontent.com/lodash/lodash/4.14.2/dist/lodash.min.js --location | md5sum
ff2d916fa4500dd3a6edee7a3d3d9813  -
curl --silent --compressed https://minime.stephan-brumme.com/files/lodash/lodash-4.14.2.min.zopfli.js.gz | md5sum
ff2d916fa4500dd3a6edee7a3d3d9813  -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/lodash/lodash/4.14.2/dist/lodash.min.js --location | sha1sum
a585fb716049ad3c37d78bf37c189b8a135e62e7  -
curl --silent --compressed https://minime.stephan-brumme.com/files/lodash/lodash-4.14.2.min.zopfli.js.gz | sha1sum
a585fb716049ad3c37d78bf37c189b8a135e62e7  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
unpkg 22986 bytes ff2d916fa4500dd3a6edee7a3d3d9813 August 8, 2016 @ 18:55
jsdelivr 22955 bytes ff2d916fa4500dd3a6edee7a3d3d9813 (invalid)

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
Boot 27258 bytes ab966b52e8e791ff2a7b6a642add454c < /**
< * @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 i(t,n){for(var r=-1,e=t?t.length:0;++r<e [...]
< var u=-1,o=t?t.length:0;for(e&&o&&(r=t[++u]);++u<o;)r=n(r, [...]
< return-1}function y(t,n,r,e){--r;for(var u=t.length;++r<u; [...]
< }return r}function k(t,n){for(var r=-1,e=Array(t);++r<t;)e [...]
< n=!!(t+"")}catch(t){}return n}function L(t){var n=-1,r=Arr [...]
[...]
August 10, 2016 @ 07:48
cdnjs 24196 bytes ab966b52e8e791ff2a7b6a642add454c < /**
< * @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 i(t,n){for(var r=-1,e=t?t.length:0;++r<e [...]
< var u=-1,o=t?t.length:0;for(e&&o&&(r=t[++u]);++u<o;)r=n(r, [...]
< return-1}function y(t,n,r,e){--r;for(var u=t.length;++r<u; [...]
< }return r}function k(t,n){for(var r=-1,e=Array(t);++r<t;)e [...]
< n=!!(t+"")}catch(t){}return n}function L(t){var n=-1,r=Arr [...]
[...]
(invalid)
cdnhttps 23906 bytes ab966b52e8e791ff2a7b6a642add454c < /**
< * @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 i(t,n){for(var r=-1,e=t?t.length:0;++r<e [...]
< var u=-1,o=t?t.length:0;for(e&&o&&(r=t[++u]);++u<o;)r=n(r, [...]
< return-1}function y(t,n,r,e){--r;for(var u=t.length;++r<u; [...]
< }return r}function k(t,n){for(var r=-1,e=Array(t);++r<t;)e [...]
< n=!!(t+"")}catch(t){}return n}function L(t){var n=-1,r=Arr [...]
[...]
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:

4.17.11, 4.17.10, 4.17.9, 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
22141 bytes -1 byte zopfli --i1000000 --mls8 --bsr4 --lazy --ohh August 9, 2016 @ 13:37
22142 bytes -5 bytes zopfli --i100000 --mls8 --bsr4 --lazy --ohh August 8, 2016 @ 19:45
22147 bytes -1 byte zopfli --i10000 --mls8 --bsr4 --lazy --ohh August 8, 2016 @ 19:05
22148 bytes -2 bytes zopfli --i1000 --mls8 --bsr4 --lazy --ohh August 8, 2016 @ 18:59
22150 bytes -6 bytes zopfli --i1000 --mls128 --bsr7 --lazy --ohh August 8, 2016 @ 18:59
22156 bytes zopfli --i100 --mls128 --bsr7 --lazy --ohh August 8, 2016 @ 18:58

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
22179 22190 22182 22190 22189 22189 22176 22188 22177 22184 22185 22187 22188 22193 22190
22157 22155 22141 22154 22175 22171 22163 22172 22160 22168 22167 22166 22160 22161 22177
22164 22176 22160 22161 22175 22158 22161 22160 22155 22150 22163 22166 22160 22180 22173
22168 22173 22155 22168 22170 22158 22143 22150 22149 22172 22165 22164 22163 22194 22166
22167 22157 22159 22159 22161 22162 22160 22154 22162 22153 22166 22163 22173 22177 22167
22163 22161 22158 22159 22163 22161 22149 22165 22148 22160 22149 22163 22154 22160 22175
22168 22167 22169 22161 22162 22159 22149 22151 22152 22168 22160 22163 22158 22159 22166
22166 22161 22169 22157 22169 22162 22148 22161 22145 22159 22161 22160 22159 22181 22174
22170 22170 22165 22158 22166 22161 22149 22148 22148 22165 22150 22163 22162 22190 22167
22168 22168 22168 22156 22165 22162 22159 22150 22153 22165 22166 22162 22159 22167 22175
22169 22174 22164 22160 22166 22163 22151 22155 22148 22153 22161 22163 22159 22166 22167
22168 22173 22161 22160 22172 22159 22145 22158 22151 22148 22159 22163 22162 22177 22166
22167 22169 22169 22163 22169 22163 22157 22152 22154 22148 22161 22163 22162 22168 22166
22166 22158 22161 22168 22160 22163 22150 22161 22149 22150 22165 22163 22161 22168 22179
22158 22161 22157 22158 22168 22164 22148 22151 22144 22163 22165 22164 22161 22171 22175
22158 22159 22154 22160 22163 22161 22148 22144 22149 22149 22162 22162 22163 22168 22175
22160 22168 22161 22162 22160 22160 22151 22150 22154 22169 22162 22163 22163 22168 22157
22168 22167 22167 22156 22159 22162 22159 22149 22151 22154 22163 22164 22160 22159 22176
22165 22167 22166 22159 22160 22161 22149 22151 22150 22162 22162 22162 22161 22175 22175
22166 22168 22155 22171 22165 22159 22149 22150 22143 22153 22165 22163 22165 22173 22175
22168 22170 22165 22158 22166 22162 22160 22148 22149 22153 22161 22163 22159 22169 22174
22157 22167 22160 22157 22161 22162 22150 22148 22148 22149 22165 22163 22161 22171 22166
22162 22159 22154 22160 22161 22160 22146 22161 22150 22164 22161 22163 22161 22168 22171

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 22156 bytes 100%
1,000 22148 bytes -8 bytes 100%
10,000 22146 bytes -2 bytes 100%
100,000 22142 bytes -4 bytes 2.32%
1,000,000 22141 bytes -1 byte 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
22225 bytes +84 bytes (+0.38%) +8 bytes
22290 bytes +149 bytes (+0.67%) +73 bytes
22218 bytes +77 bytes (+0.35%) +1 byte
22225 bytes +84 bytes (+0.38%) +8 bytes
22217 bytes +76 bytes (+0.34%)
22233 bytes +92 bytes (+0.42%) +16 bytes
22246 bytes +105 bytes (+0.47%) +29 bytes
22261 bytes +120 bytes (+0.54%) +44 bytes
22282 bytes +141 bytes (+0.64%) +65 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 - but your browser doesn't support it.
Algorithm Program Parameters Size Compared To Best Zopfli
ZPAQ (Wikipedia) zpaq zpaq -method 69 18675 bytes -3466 bytes (-15.65%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 19063 bytes -3078 bytes (-13.90%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 19469 bytes -2672 bytes (-12.07%)
Brotli (Wikipedia) brotli brotli -q 11 20783 bytes -1358 bytes (-6.13%)
LZMA2 (Wikipedia) xz xz -9 21284 bytes -857 bytes (-3.87%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 21417 bytes -724 bytes (-3.27%)
Zstandard (Wikipedia) zstd zstd -19 21977 bytes -164 bytes (-0.74%)

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