jQuery 1.10.1 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 274080 bytes (267.7k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 93064 bytes (90.9k, 34%).

After GZIP compression these minified files vary in size:

Microsoft	41703 bytes (40.7k)	CDN
jsdelivr	38111 bytes (37.2k)	CDN
Boot	38108 bytes (37.2k)	CDN
Baidu	33124 bytes (32.3k)	CDN
cdnjs	33117 bytes (32.3k)	CDN
gzip -6 (default)	32886 bytes (32.1k)	local copy
Google	32862 bytes (32.1k)	CDN
gzip -9	32849 bytes (32.1k)	local copy
Sina	32837 bytes (32.1k)	CDN
libdeflate -12	31780 bytes (31.0k)	local copy
7zip -mx=9 -tgzip	31778 bytes (31.0k)	local copy
zultra	31751 bytes (31.0k)	local copy
Yandex	31706 bytes (31.0k)	CDN
kzip -s0 -rn -b3	31706 bytes (31.0k)	local copy
pigz -11 -n	31706 bytes (31.0k)	local copy
Zopfli	31682 bytes (30.9k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/jquery/jquery-1.10.1.min.js (or via HTTPS)

You will automatically get the smallest jQuery 1.10.1 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 24 bytes by using my jQuery 1.10.1 Zopfli version instead of the best available CDN (0.08% smaller than Yandex, 31682 vs. 31706 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 --i100000 --mb8 --mls128 --bsr22 --lazy --ohh

(found January 8, 2016)

Description	Value	Parameter
iterations	100000	--i100000
maximum blocks	8	--mb8
maximum length score	128	--mls128
block splitting recursion	22	--bsr22
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-1.10.1.min.js --location | md5sum
33d85132f0154466fc017dd05111873d -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-1.10.1.min.zopfli.js.gz | md5sum
33d85132f0154466fc017dd05111873d -

SHA1:
curl --silent --compressed https://code.jquery.com/jquery-1.10.1.min.js --location | sha1sum
161b78ec52f28657a835e4a5423f03782fd35806 -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-1.10.1.min.zopfli.js.gz | sha1sum
161b78ec52f28657a835e4a5423f03782fd35806 -

These CDNs send you the original file:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Microsoft	41703 bytes	33d85132f0154466fc017dd05111873d	(invalid)
jsdelivr	38111 bytes	33d85132f0154466fc017dd05111873d	(invalid)
Sina	32837 bytes	33d85132f0154466fc017dd05111873d	(invalid)

And some CDNs send you a different file:

CDN	Size (compressed)	MD5 (uncompressed)	Comment / Diff	Timestamp
Boot	38108 bytes	2c348a8a373a2e0dc0f8d9cf2c87dfe1	< //@ sourceMappingURL=jquery-1.10.1.min.map > //@ sourceMappingURL=jquery.min.map	March 18, 2015 @ 09:39
Baidu	33124 bytes	2c9c0ab2d8647b0e67f1f6dbf4f796ea	< //@ sourceMappingURL=jquery-1.10.1.min.map > //@ sourceMappingURL=jquery.min.map	January 7, 2015 @ 10:16
cdnjs	33117 bytes	2c348a8a373a2e0dc0f8d9cf2c87dfe1	< //@ sourceMappingURL=jquery-1.10.1.min.map > //@ sourceMappingURL=jquery.min.map	(invalid)
Google	32862 bytes	2c348a8a373a2e0dc0f8d9cf2c87dfe1	< //@ sourceMappingURL=jquery-1.10.1.min.map > //@ sourceMappingURL=jquery.min.map	(invalid)
Yandex	31706 bytes	2c348a8a373a2e0dc0f8d9cf2c87dfe1	< //@ sourceMappingURL=jquery-1.10.1.min.map > //@ sourceMappingURL=jquery.min.map	June 15, 2015 @ 21:17

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

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
31682 bytes	-1 byte	zopfli --i100000 --mls128 --bsr22 --lazy --ohh	January 8, 2016 @ 13:36
31683 bytes	-1 byte	zopfli --i100000 --mls128 --bsr19 --lazy --ohh	October 21, 2015 @ 12:32
31684 bytes	-2 bytes	zopfli --i10000 --mls32 --bsr20 --lazy --ohh	October 13, 2015 @ 20:05
31686 bytes	-1 byte	zopfli --i1000 --mls32 --bsr20 --lazy --ohh	September 19, 2015 @ 04:15
31687 bytes	-1 byte	zopfli --i1000 --mls128 --bsr16 --lazy --ohh	September 16, 2015 @ 10:16
31688 bytes	-1 byte	zopfli --i1000 --mls128 --bsr7 --lazy --ohh	September 16, 2015 @ 10:15
31689 bytes	-2 bytes	zopfli --i100000 --mls512 --bsr10 --lazy --ohh	September 2, 2015 @ 07:04
31691 bytes	-3 bytes	zopfli --i1000 --mls512 --bsr10 --lazy --ohh	September 1, 2015 @ 20:41
31694 bytes	–	zopfli --i100 --mls4096 --bsr13 --lazy --ohh	September 1, 2015 @ 20:27

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 @ 12:54.

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	31700	31700	31700	31697	31697	31696	31696	31697	31697	31697	31700	31697	31696	31695	31696
4	31704	31705	31704	31704	31695	31697	31699	31694	31694	31692	31697	31701	31700	31702	31706
6	31684	31696	31696	31702	31692	31691	31703	31694	31696	31697	31697	31697	31693	31703	31693
7	31696	31702	31701	31694	31699	31693	31687	31701	31691	31696	31696	31696	31695	31703	31703
8	31696	31701	31702	31701	31695	31699	31697	31693	31697	31698	31693	31694	31697	31694	31696
9	31702	31695	31696	31687	31700	31693	31688	31695	31695	31701	31697	31696	31695	31695	31706
10	31699	31701	31701	31700	31699	31694	31694	31692	31689	31700	31695	31696	31702	31703	31703
11	31696	31701	31705	31701	31691	31692	31691	31694	31696	31700	31695	31695	31702	31703	31705
12	31692	31699	31702	31695	31699	31693	31696	31693	31692	31701	31696	31696	31693	31707	31702
13	31687	31694	31696	31701	31686	31696	31693	31693	31694	31699	31697	31689	31695	31707	31702
14	31697	31700	31696	31705	31683	31694	31699	31695	31696	31700	31697	31690	31700	31707	31704
15	31697	31702	31701	31703	31705	31700	31698	31693	31695	31701	31697	31696	31694	31703	31703
16	31698	31701	31702	31687	31687	31693	31686	31701	31699	31701	31696	31696	31693	31703	31703
17	31699	31702	31697	31695	31699	31693	31695	31693	31696	31700	31695	31691	31695	31703	31703
18	31697	31702	31701	31705	31696	31701	31704	31693	31694	31697	31696	31697	31693	31703	31704
19	31698	31700	31701	31699	31692	31700	31683	31693	31699	31700	31695	31693	31693	31703	31703
20	31688	31695	31694	31690	31684	31694	31704	31694	31700	31700	31695	31697	31693	31703	31695
21	31697	31700	31701	31701	31692	31693	31696	31694	31690	31700	31694	31691	31702	31703	31704
22	31699	31702	31700	31700	31691	31700	31682	31694	31697	31697	31695	31697	31694	31703	31705
23	31698	31702	31701	31693	31704	31700	31703	31694	31691	31697	31696	31696	31693	31703	31703
25	31699	31702	31701	31705	31705	31692	31702	31694	31695	31700	31696	31693	31692	31701	31702
30	31699	31702	31701	31691	31704	31700	31694	31693	31695	31697	31697	31696	31695	31703	31703
40	31697	31700	31702	31701	31686	31695	31693	31693	31695	31695	31696	31696	31694	31703	31704

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	31690 bytes	–	100%
1,000	31686 bytes	-4 bytes	100%
10,000	31684 bytes	-2 bytes	100%
100,000	31682 bytes	-2 bytes	1.74%
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)	31771 bytes	+89 bytes (+0.28%)	+65 bytes
1	31769 bytes	+87 bytes (+0.27%)	+63 bytes
2	31707 bytes	+25 bytes (+0.08%)	+1 byte
3	31706 bytes	+24 bytes (+0.08%)	–
4	31720 bytes	+38 bytes (+0.12%)	+14 bytes
5	31754 bytes	+72 bytes (+0.23%)	+48 bytes
6	31765 bytes	+83 bytes (+0.26%)	+59 bytes
7	31803 bytes	+121 bytes (+0.38%)	+97 bytes
8	31835 bytes	+153 bytes (+0.48%)	+129 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	26085 bytes	-5597 bytes (-17.67%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	26722 bytes	-4960 bytes (-15.66%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	28227 bytes	-3455 bytes (-10.91%)
Brotli (Wikipedia)	brotli	brotli -q 11	29546 bytes	-2136 bytes (-6.74%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	29970 bytes	-1712 bytes (-5.40%)
LZMA2 (Wikipedia)	xz	xz -9	30700 bytes	-982 bytes (-3.10%)
Zstandard (Wikipedia)	zstd	zstd -19	31208 bytes	-474 bytes (-1.50%)

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.