Choose a version:
13% The original file has 542559 bytes (529.8k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 72805 bytes (71.1k, 13%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  25816 bytes (25.2k)
local copy
gzip -9
  25767 bytes (25.2k)
local copy
libdeflate -12
  24982 bytes (24.4k)
local copy
7zip -mx=9 -tgzip
  24830 bytes (24.2k)
local copy
zultra
  24788 bytes (24.2k)
local copy
pigz -11 -n
  24734 bytes (24.2k)
local copy
kzip -s0 -rn -b6
  24676 bytes (24.1k)
local copy
Zopfli
  24623 bytes (24.0k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/lodash/lodash-4.17.17.min.js (or via HTTPS)

You will automatically get the smallest lodash 4.17.17 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

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 --mls32 --bsr17 --lazy --ohh

(found July 13, 2020)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 32  --mls32
block splitting recursion 17  --bsr17
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/4.17.17/dist/lodash.min.js --location | md5sum
24ff505ba448354c5dde1c8e79c04103  -
curl --silent --compressed https://minime.stephan-brumme.com/files/lodash/lodash-4.17.17.min.zopfli.js.gz | md5sum
24ff505ba448354c5dde1c8e79c04103  -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/lodash/lodash/4.17.17/dist/lodash.min.js --location | sha1sum
191b97709bd72353b4b431ee1b38792ad8212e95  -
curl --silent --compressed https://minime.stephan-brumme.com/files/lodash/lodash-4.17.17.min.zopfli.js.gz | sha1sum
191b97709bd72353b4b431ee1b38792ad8212e95  -

Other Versions

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

4.17.20, 4.17.19, 4.17.18, 4.17.17, 4.17.16, 4.17.15, 4.17.14, 4.17.13, 4.17.12, 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
24623 bytes -2 bytes zopfli --i1000000 --mls32 --bsr17 --lazy --ohh July 13, 2020 @ 17:40
24625 bytes -5 bytes zopfli --i100000 --mls256 --bsr19 --lazy --ohh July 13, 2020 @ 11:16
24630 bytes -3 bytes zopfli --i10000 --mls256 --bsr19 --lazy --ohh July 11, 2020 @ 06:00
24633 bytes -3 bytes zopfli --i10000 --mls2 --bsr19 --lazy --ohh July 11, 2020 @ 05:05
24636 bytes -1 byte zopfli --i10000 --mls128 --bsr23 --lazy --ohh July 10, 2020 @ 20:33
24637 bytes -7 bytes zopfli --i1000 --mls2 --bsr19 --lazy --ohh July 10, 2020 @ 17:02
24644 bytes -2 bytes zopfli --i1000 --mls2 --bsr15 --lazy --ohh July 10, 2020 @ 17:00
24646 bytes zopfli --i100 --mls32 --bsr17 --lazy --ohh July 10, 2020 @ 16:47

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

Most recent activity on July 20, 2020 @ 12:52.

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
24746 24710 24730 24737 24739 24731 24778 24714 24718 24730 24719 24737 24744 24729 24719
24673 24658 24668 24675 24672 24675 24671 24683 24696 24686 24672 24712 24661 24647 24661
24658 24671 24712 24658 24675 24658 24653 24706 24659 24652 24657 24713 24643 24654 24699
24708 24663 24698 24705 24698 24697 24702 24707 24702 24698 24701 24701 24709 24717 24693
24705 24674 24719 24710 24723 24697 24701 24713 24704 24698 24712 24709 24686 24705 24697
24666 24683 24718 24709 24699 24705 24702 24720 24701 24706 24698 24718 24686 24702 24698
24676 24672 24720 24650 24695 24653 24699 24634 24653 24648 24644 24702 24650 24699 24691
24652 24656 24651 24651 24645 24634 24652 24648 24651 24648 24665 24648 24644 24647 24662
24648 24648 24656 24655 24639 24643 24650 24647 24645 24652 24654 24651 24644 24648 24655
24644 24665 24659 24645 24654 24641 24635 24648 24649 24651 24634 24701 24703 24651 24719
24721 24679 24718 24702 24638 24655 24707 24682 24664 24698 24698 24702 24694 24713 24699
24636 24658 24711 24637 24637 24641 24700 24641 24659 24653 24639 24645 24648 24654 24652
24643 24666 24715 24634 24651 24641 24700 24697 24696 24699 24701 24700 24694 24705 24704
24638 24650 24653 24642 24623 24638 24647 24644 24628 24655 24710 24706 24650 24654 24700
24637 24667 24657 24643 24642 24647 24642 24638 24654 24656 24644 24653 24642 24652 24656
24633 24658 24655 24636 24637 24636 24697 24623 24655 24655 24637 24643 24646 24646 24655
24637 24656 24717 24636 24635 24654 24692 24636 24659 24655 24640 24651 24662 24653 24656
24666 24654 24710 24642 24648 24641 24690 24635 24653 24655 24644 24702 24663 24646 24694
24662 24668 24710 24706 24711 24648 24697 24706 24698 24708 24640 24703 24695 24705 24702
24661 24660 24658 24653 24634 24643 24636 24633 24662 24658 24706 24652 24643 24651 24699
24638 24649 24655 24651 24626 24646 24654 24638 24664 24654 24647 24704 24643 24646 24661
24634 24659 24653 24645 24634 24636 24649 24637 24663 24663 24653 24650 24690 24699 24658
24646 24654 24659 24633 24642 24653 24643 24648 24649 24652 24638 24709 24641 24649 24651

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 24646 bytes 100%
1,000 24637 bytes -9 bytes 100%
10,000 24630 bytes -7 bytes 100%
100,000 24625 bytes -5 bytes 1.16%
1,000,000 24623 bytes -2 bytes 0.58%
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
24724 bytes +101 bytes (+0.41%) +48 bytes
24970 bytes +347 bytes (+1.41%) +294 bytes
24827 bytes +204 bytes (+0.83%) +151 bytes
24769 bytes +146 bytes (+0.59%) +93 bytes
24724 bytes +101 bytes (+0.41%) +48 bytes
24714 bytes +91 bytes (+0.37%) +38 bytes
24676 bytes +53 bytes (+0.22%)
24697 bytes +74 bytes (+0.30%) +21 bytes
24710 bytes +87 bytes (+0.35%) +34 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 - for example, your browser actually supports it !
Algorithm Program Parameters Size Compared To Best Zopfli
ZPAQ (Wikipedia) zpaq zpaq -method 69 20755 bytes -3868 bytes (-15.71%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 21812 bytes -2811 bytes (-11.42%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 21887 bytes -2736 bytes (-11.11%)
Brotli (Wikipedia) brotli brotli -q 11 22944 bytes -1679 bytes (-6.82%)
LZMA2 (Wikipedia) xz xz -9 23388 bytes -1235 bytes (-5.02%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 24180 bytes -443 bytes (-1.80%)
Zstandard (Wikipedia) zstd zstd -19 24401 bytes -222 bytes (-0.90%)

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 2020.
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

All trademarks are property of their respective owners. You know, the boring legal stuff.