jQuery 1.0 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 45369 bytes (44.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 17171 bytes (16.8k, 38%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	8899 bytes (8.7k)	local copy
gzip -9	8898 bytes (8.7k)	local copy
libdeflate -12	8715 bytes (8.5k)	local copy
7zip -mx=9 -tgzip	8633 bytes (8.4k)	local copy
zultra	8587 bytes (8.4k)	local copy
pigz -11 -n	8575 bytes (8.4k)	local copy
kzip -s0 -rn -b2	8558 bytes (8.4k)	local copy
Zopfli	8545 bytes (8.3k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/jquery/jquery-1.0.pack.js (or via HTTPS)

You will automatically get the smallest jQuery 1.0 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

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 --mls512 --bsr20 --lazy --ohh

(found November 23, 2015)

Description	Value	Parameter
iterations	100000	--i100000
maximum blocks	8	--mb8
maximum length score	512	--mls512
block splitting recursion	20	--bsr20
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://code.jquery.com/jquery-1.0.pack.js --location | md5sum
a4c423deaeb404daf145ac9231b0785c -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-1.0.pack.zopfli.js.gz | md5sum
a4c423deaeb404daf145ac9231b0785c -

SHA1:
curl --silent --compressed https://code.jquery.com/jquery-1.0.pack.js --location | sha1sum
88c03b5c437ac3551661ecfbe6e1de155c3099c4 -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-1.0.pack.zopfli.js.gz | sha1sum
88c03b5c437ac3551661ecfbe6e1de155c3099c4 -

Other Versions

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

3.6.1, 3.6.0,
3.5.1, 3.5.0,
3.4.1, 3.4.0,
3.3.1, 3.3.0,
3.2.1, 3.2.0,
3.1.1, 3.1.0, 3.0.0,
2.2.4, 2.2.3, 2.2.2, 2.2.1, 2.2.0,
2.1.4, 2.1.3, 2.1.2, 2.1.1, 2.1.0,
2.0.3, 2.0.2, 2.0.1, 2.0.0,
1.12.4, 1.12.3, 1.12.2, 1.12.1, 1.12.0,
1.11.3, 1.11.2, 1.11.1, 1.11.0,
1.10.2, 1.10.1, 1.10.0,
1.9.1, 1.9.0,
1.8.3, 1.8.2, 1.8.1, 1.8.0,
1.7.2, 1.7.1, 1.7.0,
1.6.4, 1.6.3, 1.6.2, 1.6.1, 1.6,
1.5.2, 1.5.1, 1.5,
1.4.4, 1.4.3, 1.4.2, 1.4.1, 1.4,
1.3.2, 1.3.1, 1.3,
1.2.6, 1.2.5, 1.2.4, 1.2.3, 1.2.2, 1.2.1, 1.2,
1.1.4, 1.1.3, 1.1.2, 1.1.1, 1.1,
1.0.4, 1.0.3, 1.0.2, 1.0.1, 1.0

The project site contains an overview how well these versions were compressed.
Other interesting projects are AngularJS, BackboneJS, Bootstrap, D3, Dojo, Ember, Knockout, lodash, React, Socket.IO, ThreeJS, UnderscoreJS and Vue.

Changelog

Best Zopfli parameters so far:

Size	Improvement	Parameters	Found
8545 bytes	-1 byte	zopfli --i100000 --mls512 --bsr20 --lazy --ohh	November 23, 2015 @ 11:59
8546 bytes	-1 byte	zopfli --i10000 --mls512 --bsr20 --lazy --ohh	November 23, 2015 @ 08:21
8547 bytes	-1 byte	zopfli --i10000 --mls128 --bsr7 --lazy --ohh	November 23, 2015 @ 08:20
8548 bytes	-2 bytes	zopfli --i1000 --mls128 --bsr7 --lazy --ohh	September 20, 2015 @ 20:54
8550 bytes	-4 bytes	zopfli --i1000 --mls128 --bsr14 --lazy --ohh	September 16, 2015 @ 19:06
8554 bytes	-2 bytes	zopfli --i1000 --mls128 --bsr10 --lazy --ohh	September 16, 2015 @ 19:05
8556 bytes	–	zopfli --i100 --mls128 --bsr14 --lazy --ohh	September 11, 2015 @ 11:19

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 @ 12:43.

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
2	8568	8569	8568	8570	8575	8571	8567	8555	8554	8567	8568	8565	8563	8565	8566
4	8555	8552	8552	8552	8552	8551	8549	8548	8552	8578	8581	8591	8557	8598	8598
6	8548	8549	8555	8549	8549	8551	8549	8552	8551	8550	8553	8559	8560	8551	8551
7	8557	8551	8557	8552	8549	8549	8545	8552	8549	8552	8555	8558	8561	8558	8559
8	8569	8572	8571	8552	8552	8550	8567	8557	8553	8550	8553	8562	8573	8578	8580
9	8552	8548	8554	8553	8551	8550	8553	8550	8549	8551	8554	8563	8558	8559	8559
10	8552	8551	8553	8549	8550	8550	8552	8552	8546	8552	8553	8562	8563	8560	8560
11	8554	8550	8552	8553	8551	8550	8546	8553	8554	8550	8553	8562	8560	8559	8559
12	8552	8555	8553	8549	8552	8551	8548	8552	8550	8550	8551	8563	8561	8564	8564
13	8549	8548	8551	8549	8550	8551	8548	8550	8551	8551	8552	8561	8560	8567	8567
14	8551	8552	8551	8552	8551	8550	8548	8549	8546	8551	8555	8564	8561	8561	8561
15	8552	8553	8551	8552	8551	8550	8548	8553	8548	8551	8559	8562	8556	8559	8562
16	8546	8552	8550	8553	8550	8549	8549	8552	8554	8552	8553	8557	8557	8557	8559
17	8552	8552	8551	8553	8550	8550	8548	8552	8548	8551	8559	8561	8559	8560	8562
18	8553	8549	8552	8552	8549	8550	8548	8552	8550	8550	8559	8561	8554	8562	8562
19	8552	8552	8551	8552	8550	8551	8549	8545	8551	8552	8558	8562	8558	8560	8560
20	8552	8548	8552	8552	8550	8551	8546	8548	8545	8552	8559	8557	8560	8562	8565
21	8553	8552	8551	8552	8550	8552	8549	8552	8552	8550	8559	8559	8559	8563	8563
22	8552	8551	8552	8552	8549	8551	8548	8552	8553	8550	8554	8558	8561	8559	8559
23	8552	8552	8551	8549	8548	8551	8548	8546	8550	8550	8553	8563	8558	8562	8562
25	8549	8550	8553	8552	8551	8551	8549	8548	8549	8551	8551	8562	8561	8561	8561
30	8550	8552	8552	8552	8550	8550	8548	8548	8553	8551	8558	8558	8552	8562	8562
40	8551	8552	8551	8552	8551	8551	8549	8549	8546	8554	8551	8562	8561	8566	8566

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	8552 bytes	–	100%
1,000	8548 bytes	-4 bytes	100%
10,000	8546 bytes	-2 bytes	100%
100,000	8545 bytes	-1 byte	2.90%
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
(any)	8558 bytes	+13 bytes (+0.15%)	–
1	8711 bytes	+166 bytes (+1.94%)	+153 bytes
2	8558 bytes	+13 bytes (+0.15%)	–
3	8562 bytes	+17 bytes (+0.20%)	+4 bytes
4	8584 bytes	+39 bytes (+0.46%)	+26 bytes
5	8617 bytes	+72 bytes (+0.84%)	+59 bytes
6	8634 bytes	+89 bytes (+1.04%)	+76 bytes
7	8666 bytes	+121 bytes (+1.42%)	+108 bytes
8	8695 bytes	+150 bytes (+1.76%)	+137 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
Brotli (Wikipedia)	brotli	brotli -q 11	7943 bytes	-602 bytes (-7.05%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	8218 bytes	-327 bytes (-3.83%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	8298 bytes	-247 bytes (-2.89%)
LZMA2 (Wikipedia)	xz	xz -9	8432 bytes	-113 bytes (-1.32%)
ZPAQ (Wikipedia)	zpaq	zpaq -method 69	8540 bytes	-5 bytes (-0.06%)
Zstandard (Wikipedia)	zstd	zstd -19	8689 bytes	+144 bytes (+1.69%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	8941 bytes	+396 bytes (+4.63%)

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.