Choose a version:
13% The original file has 472264 bytes (461.2k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 63687 bytes (62.2k, 13%).

After GZIP compression these minified files vary in size:
Boot
  37589 bytes (36.7k)
CDN
cdnjs
  30939 bytes (30.2k)
CDN
cdnhttps
  30450 bytes (29.7k)
CDN
gzip -6 (default)
  21180 bytes (20.7k)
local copy
jsdelivr
  21107 bytes (20.6k)
CDN
gzip -9
  21096 bytes (20.6k)
local copy
7zip -mx=9 -tgzip
  20444 bytes (20.0k)
local copy
libdeflate -12
  20442 bytes (20.0k)
local copy
kzip -s0 -rn -b2
  20373 bytes (19.9k)
local copy
pigz -11 -n
  20316 bytes (19.8k)
local copy
Zopfli
  20284 bytes (19.8k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/lodash/lodash-4.5.0.min.js (or via HTTPS)

You will automatically get the smallest lodash 4.5.0 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 823 bytes by using my lodash 4.5.0 Zopfli version instead of the best available CDN (4.06% smaller than jsdelivr, 20284 vs. 21107 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 --mls4 --bsr25 --lazy --ohh

(found April 13, 2016)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 4  --mls4
block splitting recursion 25  --bsr25
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/4.5.0/dist/lodash.min.js --location | md5sum
0055346a59f9f22e943fce541428d06d  -
curl --silent --compressed https://minime.stephan-brumme.com/files/lodash/lodash-4.5.0.min.zopfli.js.gz | md5sum
0055346a59f9f22e943fce541428d06d  -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/lodash/lodash/4.5.0/dist/lodash.min.js --location | sha1sum
101b696dfe2bef57e14cdac3019a141b3f8aa1b2  -
curl --silent --compressed https://minime.stephan-brumme.com/files/lodash/lodash-4.5.0.min.zopfli.js.gz | sha1sum
101b696dfe2bef57e14cdac3019a141b3f8aa1b2  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
jsdelivr 21107 bytes 0055346a59f9f22e943fce541428d06d (invalid)

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
Boot 37589 bytes ff95b9e328fb16767bed6acd47655d16 < /**
< * @license
< * lodash 4.5.0 (Custom Build) lodash.com/license | Unders [...]
< * Build: `lodash -o ./dist/lodash.js`
< */
< ;(function(){function n(n,t){return n.set(t[0],t[1]),n}fun [...]
< return true}function i(n,t){for(var r=-1,e=n.length,u=-1,o [...]
< var u=n.length;for(e&&u&&(r=n[--u]);u--;)r=t(r,n[u],u,n);r [...]
< return-1}function y(n,t,r,e,u){return u(n,function(n,u,o){ [...]
< return r}function k(n,t){for(var r=n.length;r--&&-1<d(t,n[ [...]
[...]
(invalid)
cdnjs 30939 bytes ff95b9e328fb16767bed6acd47655d16 < /**
< * @license
< * lodash 4.5.0 (Custom Build) lodash.com/license | Unders [...]
< * Build: `lodash -o ./dist/lodash.js`
< */
< ;(function(){function n(n,t){return n.set(t[0],t[1]),n}fun [...]
< return true}function i(n,t){for(var r=-1,e=n.length,u=-1,o [...]
< var u=n.length;for(e&&u&&(r=n[--u]);u--;)r=t(r,n[u],u,n);r [...]
< return-1}function y(n,t,r,e,u){return u(n,function(n,u,o){ [...]
< return r}function k(n,t){for(var r=n.length;r--&&-1<d(t,n[ [...]
[...]
(invalid)
cdnhttps 30450 bytes ff95b9e328fb16767bed6acd47655d16 < /**
< * @license
< * lodash 4.5.0 (Custom Build) lodash.com/license | Unders [...]
< * Build: `lodash -o ./dist/lodash.js`
< */
< ;(function(){function n(n,t){return n.set(t[0],t[1]),n}fun [...]
< return true}function i(n,t){for(var r=-1,e=n.length,u=-1,o [...]
< var u=n.length;for(e&&u&&(r=n[--u]);u--;)r=t(r,n[u],u,n);r [...]
< return-1}function y(n,t,r,e,u){return u(n,function(n,u,o){ [...]
< return r}function k(n,t){for(var r=n.length;r--&&-1<d(t,n[ [...]
[...]
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
20284 bytes -4 bytes zopfli --i100000 --mls4 --bsr25 --lazy --ohh April 13, 2016 @ 16:02
20288 bytes -4 bytes zopfli --i100000 --mls512 --bsr22 --lazy --ohh April 12, 2016 @ 11:27
20292 bytes -6 bytes zopfli --i10000 --mls512 --bsr22 --lazy --ohh April 12, 2016 @ 10:43
20298 bytes -2 bytes zopfli --i1000 --mls512 --bsr22 --lazy --ohh April 12, 2016 @ 09:21
20300 bytes zopfli --i100 --mls512 --bsr22 --lazy --ohh April 12, 2016 @ 03:18

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 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
20322 20317 20324 20344 20328 20344 20332 20345 20342 20336 20334 20323 20323 20341 20341
20297 20295 20299 20294 20303 20302 20305 20293 20294 20301 20310 20312 20316 20323 20298
20292 20306 20295 20295 20300 20299 20299 20303 20300 20310 20317 20317 20315 20307 20298
20291 20293 20296 20298 20293 20293 20292 20291 20291 20300 20294 20315 20295 20298 20299
20294 20291 20285 20291 20294 20293 20290 20292 20292 20299 20299 20312 20312 20302 20298
20293 20302 20307 20298 20307 20292 20297 20312 20301 20293 20290 20313 20296 20298 20315
20294 20292 20296 20301 20297 20297 20298 20292 20297 20302 20296 20312 20316 20300 20304
20294 20292 20301 20298 20293 20294 20296 20290 20300 20298 20301 20314 20293 20298 20296
20294 20292 20300 20299 20295 20292 20296 20291 20291 20303 20300 20315 20294 20299 20300
20293 20292 20304 20298 20294 20293 20296 20290 20292 20302 20296 20316 20297 20297 20298
20293 20298 20308 20295 20293 20293 20297 20301 20292 20299 20301 20312 20295 20300 20302
20296 20295 20308 20299 20292 20291 20297 20300 20299 20300 20292 20315 20293 20298 20300
20292 20290 20299 20298 20293 20294 20293 20292 20301 20299 20298 20314 20293 20298 20300
20293 20293 20295 20294 20294 20294 20295 20299 20290 20298 20294 20311 20293 20300 20301
20294 20292 20296 20298 20297 20295 20304 20300 20291 20293 20296 20312 20293 20302 20302
20290 20295 20297 20295 20294 20294 20297 20292 20302 20293 20294 20316 20298 20295 20297
20293 20291 20297 20298 20295 20295 20303 20293 20299 20293 20299 20312 20314 20301 20301
20294 20292 20296 20297 20295 20293 20302 20293 20301 20299 20291 20315 20312 20300 20302
20294 20292 20311 20297 20292 20294 20302 20292 20288 20300 20296 20312 20316 20298 20299
20291 20290 20303 20294 20293 20292 20299 20293 20299 20302 20290 20320 20294 20297 20304
20294 20284 20308 20298 20295 20294 20293 20291 20290 20299 20298 20313 20294 20300 20297
20295 20293 20299 20298 20295 20293 20297 20291 20290 20300 20294 20316 20295 20297 20296
20293 20294 20299 20298 20294 20291 20295 20300 20291 20300 20294 20316 20294 20299 20298

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 20300 bytes 100%
1,000 20293 bytes -7 bytes 100%
10,000 20288 bytes -5 bytes 100%
100,000 20284 bytes -4 bytes 0.87%
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
20383 bytes +99 bytes (+0.49%) +10 bytes
20455 bytes +171 bytes (+0.84%) +82 bytes
20373 bytes +89 bytes (+0.44%)
20385 bytes +101 bytes (+0.50%) +12 bytes
20391 bytes +107 bytes (+0.53%) +18 bytes
20400 bytes +116 bytes (+0.57%) +27 bytes
20417 bytes +133 bytes (+0.66%) +44 bytes
20433 bytes +149 bytes (+0.73%) +60 bytes
20444 bytes +160 bytes (+0.79%) +71 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 17191 bytes -3093 bytes (-15.25%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 17531 bytes -2753 bytes (-13.57%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 18646 bytes -1638 bytes (-8.08%)
Brotli (Wikipedia) brotli brotli -q 11 19097 bytes -1187 bytes (-5.85%)
LZMA2 (Wikipedia) xz xz -9 19560 bytes -724 bytes (-3.57%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 19680 bytes -604 bytes (-2.98%)
Zstandard (Wikipedia) zstd zstd -19 20182 bytes -102 bytes (-0.50%)

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