Choose a version:
13% The original file has 538744 bytes (526.1k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 72690 bytes (71.0k, 13%).

After GZIP compression these minified files vary in size:
Boot
  28680 bytes (28.0k)
CDN
cdnjs
  25573 bytes (25.0k)
CDN
cdnhttps
  25347 bytes (24.8k)
CDN
unpkg
  24252 bytes (23.7k)
CDN
gzip -6 (default)
  24208 bytes (23.6k)
local copy
jsdelivr
  24152 bytes (23.6k)
CDN
gzip -9
  24151 bytes (23.6k)
local copy
7zip -mx=9 -tgzip
  23314 bytes (22.8k)
local copy
libdeflate -12
  23311 bytes (22.8k)
local copy
kzip -s0 -rn -b3
  23227 bytes (22.7k)
local copy
pigz -11 -n
  23199 bytes (22.7k)
local copy
Zopfli
  23157 bytes (22.6k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/lodash/lodash-4.17.2.min.js (or via HTTPS)

You will automatically get the smallest lodash 4.17.2 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 995 bytes by using my lodash 4.17.2 Zopfli version instead of the best available CDN (4.30% smaller than jsdelivr, 23157 vs. 24152 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 --bsr23 --lazy --ohh

(found November 16, 2016)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 4  --mls4
block splitting recursion 23  --bsr23
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/4.17.2/dist/lodash.min.js --location | md5sum
914258a312cebd3f99962ae2a2ffb053  -
curl --silent --compressed https://minime.stephan-brumme.com/files/lodash/lodash-4.17.2.min.zopfli.js.gz | md5sum
914258a312cebd3f99962ae2a2ffb053  -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/lodash/lodash/4.17.2/dist/lodash.min.js --location | sha1sum
71e4cf088a649c6c0988635b0acb34186f66f340  -
curl --silent --compressed https://minime.stephan-brumme.com/files/lodash/lodash-4.17.2.min.zopfli.js.gz | sha1sum
71e4cf088a649c6c0988635b0acb34186f66f340  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
unpkg 24252 bytes 914258a312cebd3f99962ae2a2ffb053 November 16, 2016 @ 08:51
jsdelivr 24152 bytes 914258a312cebd3f99962ae2a2ffb053 (invalid)

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
Boot 28680 bytes 9faabe7d2ed948ffc7c88876dbcc8c9e < /**
< * @license
< * Lodash lodash.com/license | Underscore.js 1.8.3 undersc [...]
< */
< ;(function(){function n(n,t){return n.set(t[0],t[1]),n}fun [...]
< return n}function o(n,t){for(var r=-1,e=null==n?0:n.length [...]
< return n}function h(n,t,r,e){var u=-1,i=null==n?0:n.length [...]
< --r;for(var e=n.length;++r<e;)if(n[r]===t){n=r;break n}n=- [...]
< return n}function k(n,t){for(var r,e=-1,u=n.length;++e<u;) [...]
< return"\\"+Tn[n]}function L(n){var t=-1,r=Array(n.size);re [...]
[...]
November 17, 2016 @ 11:38
cdnjs 25573 bytes 9faabe7d2ed948ffc7c88876dbcc8c9e < /**
< * @license
< * Lodash lodash.com/license | Underscore.js 1.8.3 undersc [...]
< */
< ;(function(){function n(n,t){return n.set(t[0],t[1]),n}fun [...]
< return n}function o(n,t){for(var r=-1,e=null==n?0:n.length [...]
< return n}function h(n,t,r,e){var u=-1,i=null==n?0:n.length [...]
< --r;for(var e=n.length;++r<e;)if(n[r]===t){n=r;break n}n=- [...]
< return n}function k(n,t){for(var r,e=-1,u=n.length;++e<u;) [...]
< return"\\"+Tn[n]}function L(n){var t=-1,r=Array(n.size);re [...]
[...]
(invalid)
cdnhttps 25347 bytes 9faabe7d2ed948ffc7c88876dbcc8c9e < /**
< * @license
< * Lodash lodash.com/license | Underscore.js 1.8.3 undersc [...]
< */
< ;(function(){function n(n,t){return n.set(t[0],t[1]),n}fun [...]
< return n}function o(n,t){for(var r=-1,e=null==n?0:n.length [...]
< return n}function h(n,t,r,e){var u=-1,i=null==n?0:n.length [...]
< --r;for(var e=n.length;++r<e;)if(n[r]===t){n=r;break n}n=- [...]
< return n}function k(n,t){for(var r,e=-1,u=n.length;++e<u;) [...]
< return"\\"+Tn[n]}function L(n){var t=-1,r=Array(n.size);re [...]
[...]
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
23157 bytes -2 bytes zopfli --i100000 --mls4 --bsr23 --lazy --ohh November 16, 2016 @ 09:47
23159 bytes -2 bytes zopfli --i10000 --mls4 --bsr23 --lazy --ohh November 16, 2016 @ 09:04
23161 bytes -3 bytes zopfli --i10000 --mls1024 --bsr8 --lazy --ohh November 16, 2016 @ 08:59
23164 bytes -1 byte zopfli --i1000 --mls1024 --bsr8 --lazy --ohh November 16, 2016 @ 08:55
23165 bytes -1 byte zopfli --i1000 --mls4 --bsr23 --lazy --ohh November 16, 2016 @ 08:55
23166 bytes -1 byte zopfli --i1000 --mls8 --bsr11 --lazy --ohh November 16, 2016 @ 08:55
23167 bytes -5 bytes zopfli --i1000 --mls1024 --bsr7 --lazy --ohh November 16, 2016 @ 08:54
23172 bytes zopfli --i100 --mls1024 --bsr7 --lazy --ohh November 16, 2016 @ 08:52

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

Most recent activity on January 25, 2017 @ 15:30.

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
23214 23219 23212 23196 23206 23210 23197 23202 23201 23206 23209 23204 23206 23217 23211
23183 23202 23202 23229 23204 23185 23200 23185 23182 23185 23184 23193 23186 23211 23191
23183 23169 23182 23182 23172 23173 23173 23163 23175 23164 23172 23173 23165 23187 23180
23180 23163 23168 23177 23171 23171 23181 23178 23179 23160 23177 23171 23180 23181 23193
23178 23173 23160 23171 23187 23171 23184 23184 23181 23160 23176 23170 23186 23193 23184
23190 23172 23171 23170 23179 23171 23160 23178 23181 23171 23185 23185 23193 23186 23194
23173 23171 23172 23171 23181 23177 23168 23178 23178 23178 23176 23172 23163 23192 23170
23179 23161 23163 23170 23175 23183 23172 23160 23176 23160 23187 23186 23186 23188 23185
23179 23170 23158 23171 23170 23170 23174 23179 23174 23170 23171 23169 23172 23186 23171
23179 23170 23163 23171 23170 23182 23163 23194 23177 23163 23165 23172 23171 23185 23170
23192 23173 23160 23171 23169 23171 23174 23185 23173 23169 23173 23171 23171 23184 23185
23180 23172 23171 23170 23178 23171 23180 23180 23173 23169 23172 23172 23177 23181 23170
23183 23170 23171 23176 23184 23184 23178 23177 23174 23169 23177 23173 23171 23182 23185
23174 23170 23170 23171 23178 23172 23165 23168 23176 23161 23172 23170 23171 23185 23170
23175 23174 23171 23183 23168 23172 23173 23181 23178 23166 23176 23170 23172 23187 23188
23189 23161 23170 23171 23195 23171 23160 23168 23175 23160 23189 23173 23188 23184 23182
23171 23170 23164 23170 23179 23171 23180 23179 23175 23163 23175 23185 23190 23190 23171
23170 23174 23172 23170 23172 23171 23164 23171 23176 23166 23171 23171 23171 23185 23170
23170 23172 23163 23172 23176 23170 23174 23179 23173 23160 23173 23159 23172 23185 23186
23171 23157 23160 23170 23170 23170 23159 23183 23174 23171 23159 23174 23172 23187 23173
23179 23172 23170 23170 23172 23171 23163 23169 23186 23161 23160 23180 23173 23186 23187
23208 23163 23171 23170 23170 23171 23165 23180 23178 23161 23163 23172 23172 23185 23185
23172 23175 23177 23164 23182 23170 23166 23178 23175 23173 23165 23173 23171 23186 23186

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 23172 bytes 100%
1,000 23164 bytes -8 bytes 100%
10,000 23159 bytes -5 bytes 100%
100,000 23157 bytes -2 bytes 6.38%
1,000,000 23157 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
23255 bytes +98 bytes (+0.42%) +28 bytes
23413 bytes +256 bytes (+1.11%) +186 bytes
23289 bytes +132 bytes (+0.57%) +62 bytes
23227 bytes +70 bytes (+0.30%)
23250 bytes +93 bytes (+0.40%) +23 bytes
23257 bytes +100 bytes (+0.43%) +30 bytes
23239 bytes +82 bytes (+0.35%) +12 bytes
23259 bytes +102 bytes (+0.44%) +32 bytes
23281 bytes +124 bytes (+0.54%) +54 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 19460 bytes -3697 bytes (-15.96%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 20098 bytes -3059 bytes (-13.21%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 20913 bytes -2244 bytes (-9.69%)
Brotli (Wikipedia) brotli brotli -q 11 21661 bytes -1496 bytes (-6.46%)
LZMA2 (Wikipedia) xz xz -9 22168 bytes -989 bytes (-4.27%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 22514 bytes -643 bytes (-2.78%)
Zstandard (Wikipedia) zstd zstd -19 23040 bytes -117 bytes (-0.51%)

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