lodash 4.17.21 (latest) - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 544098 bytes (531.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 73015 bytes (71.3k, 13%).

After GZIP compression these minified files vary in size:

unpkg	29517 bytes (28.8k)	CDN
Boot	26035 bytes (25.4k)	CDN
cdnjs	26035 bytes (25.4k)	CDN
gzip -6 (default)	25949 bytes (25.3k)	local copy
gzip -9	25900 bytes (25.3k)	local copy
libdeflate -12	25088 bytes (24.5k)	local copy
7zip -mx=9 -tgzip	24958 bytes (24.4k)	local copy
zultra	24916 bytes (24.3k)	local copy
pigz -11 -n	24835 bytes (24.3k)	local copy
kzip -s0 -rn -b6	24796 bytes (24.2k)	local copy
Zopfli	24739 bytes (24.2k)	local copy
Zopfli (defluff)	24738 bytes (24.2k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/lodash/lodash-4.17.21.min.js (or via HTTPS)

You will automatically get the smallest lodash 4.17.21 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 1296 bytes by using my lodash 4.17.21 Zopfli version instead of the best available CDN (5.24% smaller than cdnjs, 24739 vs. 26035 bytes):

Download

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 --mls2 --bsr19 --lazy --ohh

(found February 23, 2021)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	2	--mls2
block splitting recursion	19	--bsr19
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 (24738 bytes).

Download

Verify file integrity

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

MD5:
curl --silent --compressed https://raw.githubusercontent.com/lodash/lodash/4.17.21/dist/lodash.min.js --location | md5sum
9becc40fb1d85d21d0ca38e2f7069511 -
curl --silent --compressed https://minime.stephan-brumme.com/files/lodash/lodash-4.17.21.min.zopfli.js.gz | md5sum
9becc40fb1d85d21d0ca38e2f7069511 -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/lodash/lodash/4.17.21/dist/lodash.min.js --location | sha1sum
ae854b04025db8b7f48fdd6dedf41e77eae44394 -
curl --silent --compressed https://minime.stephan-brumme.com/files/lodash/lodash-4.17.21.min.zopfli.js.gz | sha1sum
ae854b04025db8b7f48fdd6dedf41e77eae44394 -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
unpkg	29517 bytes	9becc40fb1d85d21d0ca38e2f7069511	(invalid)
Boot	26035 bytes	9becc40fb1d85d21d0ca38e2f7069511	(invalid)
cdnjs	26035 bytes	9becc40fb1d85d21d0ca38e2f7069511	(invalid)

Note: only the MD5 hashes are shown to keep things simple.

Other Versions

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

4.17.21, 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
24739 bytes	-2 bytes	zopfli --i1000000 --mls2 --bsr19 --lazy --ohh	February 23, 2021 @ 15:30
24741 bytes	-2 bytes	zopfli --i100000 --mls2 --bsr19 --lazy --ohh	February 22, 2021 @ 19:37
24743 bytes	-5 bytes	zopfli --i10000 --mls2 --bsr19 --lazy --ohh	February 22, 2021 @ 19:09
24748 bytes	-2 bytes	zopfli --i1000 --mls2 --bsr19 --lazy --ohh	February 22, 2021 @ 19:05
24750 bytes	-8 bytes	zopfli --i1000 --mls8 --bsr25 --lazy --ohh	February 22, 2021 @ 19:05
24758 bytes	–	zopfli --i100 --mls2 --bsr19 --lazy --ohh	February 22, 2021 @ 19:04

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

Most recent activity on February 23, 2021 @ 16:58.

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
2	24802	24803	24798	24846	24848	24835	24846	24896	24852	24853	24869	24880	24858	24829	24837
4	24771	24784	24774	24787	24806	24777	24780	24791	24793	24781	24791	24772	24772	24784	24794
6	24800	24792	24803	24762	24761	24812	24818	24814	24750	24761	24826	24753	24752	24766	24772
7	24770	24775	24799	24792	24819	24817	24812	24811	24763	24819	24815	24835	24814	24829	24827
8	24782	24791	24778	24792	24813	24824	24811	24807	24821	24814	24829	24833	24784	24815	24783
9	24786	24812	24778	24780	24823	24806	24815	24818	24813	24808	24815	24830	24809	24819	24813
10	24788	24795	24774	24791	24786	24807	24812	24803	24751	24758	24823	24830	24764	24817	24748
11	24759	24777	24773	24760	24754	24764	24767	24750	24768	24759	24764	24785	24757	24762	24752
12	24772	24771	24761	24766	24763	24779	24757	24751	24772	24759	24792	24785	24754	24763	24755
13	24775	24790	24789	24764	24755	24806	24809	24815	24760	24807	24808	24825	24766	24819	24772
14	24765	24789	24776	24776	24828	24806	24817	24805	24750	24815	24812	24779	24763	24826	24816
15	24783	24783	24779	24784	24769	24768	24811	24803	24760	24756	24764	24816	24768	24760	24761
16	24775	24775	24799	24784	24820	24755	24812	24808	24813	24814	24813	24836	24807	24818	24820
17	24771	24762	24762	24762	24759	24756	24770	24750	24758	24759	24806	24816	24763	24758	24754
18	24762	24756	24756	24749	24748	24756	24770	24750	24767	24763	24766	24784	24764	24762	24750
19	24739	24766	24759	24754	24749	24750	24808	24749	24759	24759	24757	24826	24757	24762	24756
20	24789	24792	24781	24760	24775	24742	24818	24802	24767	24760	24817	24810	24767	24762	24772
21	24771	24773	24782	24763	24821	24806	24814	24766	24749	24758	24810	24822	24764	24818	24778
22	24786	24786	24779	24772	24826	24807	24807	24802	24749	24756	24806	24820	24807	24819	24816
23	24763	24782	24754	24753	24756	24755	24760	24751	24747	24753	24815	24800	24760	24767	24753
25	24768	24754	24740	24762	24763	24776	24764	24760	24758	24764	24763	24769	24759	24764	24751
30	24752	24777	24749	24755	24753	24756	24771	24755	24750	24760	24768	24788	24769	24818	24775
40	24783	24776	24758	24765	24756	24758	24818	24750	24751	24758	24761	24833	24824	24763	24755

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	24758 bytes	–	100%
1,000	24748 bytes	-10 bytes	100%
10,000	24743 bytes	-5 bytes	100%
100,000	24741 bytes	-2 bytes	0.87%
1,000,000	24739 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
(any)	24840 bytes	+101 bytes (+0.41%)	+44 bytes
1	25091 bytes	+352 bytes (+1.42%)	+295 bytes
2	24948 bytes	+209 bytes (+0.84%)	+152 bytes
3	24883 bytes	+144 bytes (+0.58%)	+87 bytes
4	24843 bytes	+104 bytes (+0.42%)	+47 bytes
5	24833 bytes	+94 bytes (+0.38%)	+37 bytes
6	24796 bytes	+57 bytes (+0.23%)	–
7	24812 bytes	+73 bytes (+0.30%)	+16 bytes
8	24827 bytes	+88 bytes (+0.36%)	+31 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	20800 bytes	-3939 bytes (-15.92%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	21904 bytes	-2835 bytes (-11.46%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	21980 bytes	-2759 bytes (-11.15%)
Brotli (Wikipedia)	brotli	brotli -q 11	23015 bytes	-1724 bytes (-6.97%)
LZMA2 (Wikipedia)	xz	xz -9	23488 bytes	-1251 bytes (-5.06%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	24286 bytes	-453 bytes (-1.83%)
Zstandard (Wikipedia)	zstd	zstd -19	24503 bytes	-236 bytes (-0.95%)

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):

Load and Parse Data

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 2026.
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.