Choose a version:
13% The original file has 500155 bytes (488.4k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 65797 bytes (64.3k, 13%).

After GZIP compression these minified files vary in size:
Boot
  25805 bytes (25.2k)
CDN
cdnjs
  22854 bytes (22.3k)
CDN
cdnhttps
  22703 bytes (22.2k)
CDN
gzip -6 (default)
  21810 bytes (21.3k)
local copy
unpkg
  21806 bytes (21.3k)
CDN
gzip -9
  21752 bytes (21.2k)
local copy
jsdelivr
  21746 bytes (21.2k)
CDN
libdeflate -12
  21089 bytes (20.6k)
local copy
7zip -mx=9 -tgzip
  21051 bytes (20.6k)
local copy
kzip -s0 -rn -b4
  20998 bytes (20.5k)
local copy
pigz -11 -n
  20949 bytes (20.5k)
local copy
Zopfli
  20918 bytes (20.4k)
local copy
Zopfli (defluff)
  20917 bytes (20.4k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/lodash/lodash-4.8.0.min.js (or via HTTPS)

You will automatically get the smallest lodash 4.8.0 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 828 bytes by using my lodash 4.8.0 Zopfli version instead of the best available CDN (3.96% smaller than jsdelivr, 20918 vs. 21746 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 --mls1024 --bsr21 --lazy --ohh

(found April 16, 2016)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 1024  --mls1024
block splitting recursion 21  --bsr21
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 (20917 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/4.8.0/dist/lodash.min.js --location | md5sum
be07975c82d5ca4e9a4cd321e4f408c8  -
curl --silent --compressed https://minime.stephan-brumme.com/files/lodash/lodash-4.8.0.min.zopfli.js.gz | md5sum
be07975c82d5ca4e9a4cd321e4f408c8  -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/lodash/lodash/4.8.0/dist/lodash.min.js --location | sha1sum
953bc79276ac479cbd6edca044ca1182906cf177  -
curl --silent --compressed https://minime.stephan-brumme.com/files/lodash/lodash-4.8.0.min.zopfli.js.gz | sha1sum
953bc79276ac479cbd6edca044ca1182906cf177  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
unpkg 21806 bytes be07975c82d5ca4e9a4cd321e4f408c8 July 11, 2016 @ 16:46
jsdelivr 21746 bytes be07975c82d5ca4e9a4cd321e4f408c8 (invalid)

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
Boot 25805 bytes fc33ca0116cdf8442ffb845941511f96 < /**
< * @license
< * lodash 4.8.0 (Custom Build) lodash.com/license | Unders [...]
< * Build: `lodash -o ./dist/lodash.js`
< */
< ;(function(){function t(t,n){return t.set(n[0],n[1]),t}fun [...]
< return true}function i(t,n){for(var r=-1,e=t.length,u=0,o= [...]
< var u=t.length;for(e&&u&&(r=t[--u]);u--;)r=n(r,t[u],u,t);r [...]
< return-1}function y(t,n,r,e){--r;for(var u=t.length;++r<u; [...]
< })}function O(t){return function(n){return t(n)}}function [...]
[...]
May 4, 2016 @ 10:40
cdnjs 22854 bytes fc33ca0116cdf8442ffb845941511f96 < /**
< * @license
< * lodash 4.8.0 (Custom Build) lodash.com/license | Unders [...]
< * Build: `lodash -o ./dist/lodash.js`
< */
< ;(function(){function t(t,n){return t.set(n[0],n[1]),t}fun [...]
< return true}function i(t,n){for(var r=-1,e=t.length,u=0,o= [...]
< var u=t.length;for(e&&u&&(r=t[--u]);u--;)r=n(r,t[u],u,t);r [...]
< return-1}function y(t,n,r,e){--r;for(var u=t.length;++r<u; [...]
< })}function O(t){return function(n){return t(n)}}function [...]
[...]
(invalid)
cdnhttps 22703 bytes fc33ca0116cdf8442ffb845941511f96 < /**
< * @license
< * lodash 4.8.0 (Custom Build) lodash.com/license | Unders [...]
< * Build: `lodash -o ./dist/lodash.js`
< */
< ;(function(){function t(t,n){return t.set(n[0],n[1]),t}fun [...]
< return true}function i(t,n){for(var r=-1,e=t.length,u=0,o= [...]
< var u=t.length;for(e&&u&&(r=t[--u]);u--;)r=n(r,t[u],u,t);r [...]
< return-1}function y(t,n,r,e){--r;for(var u=t.length;++r<u; [...]
< })}function O(t){return function(n){return t(n)}}function [...]
[...]
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
20918 bytes -1 byte zopfli --i100000 --mls1024 --bsr21 --lazy --ohh April 16, 2016 @ 11:30
20919 bytes -3 bytes zopfli --i100000 --mls256 --bsr9 --lazy --ohh April 13, 2016 @ 18:08
20922 bytes -1 byte zopfli --i10000 --mls256 --bsr9 --lazy --ohh April 12, 2016 @ 17:47
20923 bytes -4 bytes zopfli --i10000 --mls8192 --bsr17 --lazy --ohh April 12, 2016 @ 15:34
20927 bytes -4 bytes zopfli --i1000 --mls8192 --bsr17 --lazy --ohh April 12, 2016 @ 15:30
20931 bytes -3 bytes zopfli --i1000 --mls1024 --bsr17 --lazy --ohh April 12, 2016 @ 15:30
20934 bytes zopfli --i100 --mls1024 --bsr17 --lazy --ohh April 12, 2016 @ 02:35

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
20958 20962 20963 20973 20976 20976 20977 20978 20978 20976 20967 20963 20949 20968 20963
20945 20927 20935 20941 20930 20933 20929 20927 20943 20942 20933 20947 20927 20939 20931
20936 20931 20947 20942 20935 20933 20936 20930 20943 20946 20943 20936 20936 20940 20951
20939 20928 20937 20943 20941 20930 20928 20933 20946 20924 20934 20945 20945 20933 20944
20927 20928 20929 20930 20927 20931 20928 20930 20936 20925 20933 20950 20925 20939 20932
20929 20930 20933 20944 20928 20927 20927 20919 20945 20932 20932 20945 20925 20954 20929
20927 20934 20932 20935 20930 20931 20929 20928 20935 20928 20928 20931 20943 20965 20931
20925 20928 20931 20945 20926 20934 20933 20926 20930 20933 20930 20945 20930 20940 20936
20928 20939 20937 20945 20929 20931 20927 20927 20947 20928 20932 20928 20930 20932 20929
20925 20931 20938 20920 20929 20928 20927 20929 20946 20930 20944 20944 20945 20937 20930
20930 20929 20936 20943 20927 20927 20927 20928 20945 20926 20931 20945 20924 20978 20931
20930 20930 20927 20945 20925 20930 20927 20930 20945 20929 20933 20937 20934 20933 20934
20925 20926 20929 20946 20927 20932 20923 20929 20937 20929 20933 20935 20929 20932 20932
20925 20927 20926 20946 20925 20946 20927 20929 20946 20928 20934 20948 20923 20971 20935
20928 20921 20931 20943 20928 20931 20928 20931 20946 20933 20937 20931 20930 20985 20938
20929 20926 20935 20930 20928 20928 20928 20927 20937 20930 20927 20946 20930 20938 20932
20930 20929 20928 20929 20928 20925 20929 20927 20935 20929 20932 20944 20927 20985 20932
20926 20929 20936 20933 20925 20927 20928 20929 20931 20918 20933 20933 20929 20938 20932
20919 20924 20928 20933 20925 20930 20928 20929 20947 20927 20934 20948 20930 20977 20933
20928 20927 20929 20929 20926 20931 20923 20929 20926 20925 20932 20943 20927 20937 20937
20928 20938 20937 20943 20929 20926 20928 20929 20937 20923 20930 20944 20926 20938 20937
20925 20930 20933 20928 20925 20929 20928 20929 20951 20928 20935 20936 20929 20940 20937
20928 20929 20935 20931 20928 20925 20923 20931 20937 20931 20933 20948 20930 20933 20933

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 20934 bytes 100%
1,000 20925 bytes -9 bytes 100%
10,000 20921 bytes -4 bytes 100%
100,000 20918 bytes -3 bytes 1.45%
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
21010 bytes +92 bytes (+0.44%) +12 bytes
21072 bytes +154 bytes (+0.74%) +74 bytes
21001 bytes +83 bytes (+0.40%) +3 bytes
21013 bytes +95 bytes (+0.45%) +15 bytes
20998 bytes +80 bytes (+0.38%)
21011 bytes +93 bytes (+0.44%) +13 bytes
21031 bytes +113 bytes (+0.54%) +33 bytes
21055 bytes +137 bytes (+0.65%) +57 bytes
21086 bytes +168 bytes (+0.80%) +88 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 17746 bytes -3172 bytes (-15.16%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 18086 bytes -2832 bytes (-13.54%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 18406 bytes -2512 bytes (-12.01%)
Brotli (Wikipedia) brotli brotli -q 11 19709 bytes -1209 bytes (-5.78%)
LZMA2 (Wikipedia) xz xz -9 20204 bytes -714 bytes (-3.41%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 20300 bytes -618 bytes (-2.95%)
Zstandard (Wikipedia) zstd zstd -19 20831 bytes -87 bytes (-0.42%)

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