Choose a version:
38% The original file has 252881 bytes (247.0k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 94840 bytes (92.6k, 38%).

After GZIP compression these minified files vary in size:
Microsoft
  42690 bytes (41.7k)
CDN
Boot
  38992 bytes (38.1k)
CDN
jsdelivr
  38992 bytes (38.1k)
CDN
Baidu
  33892 bytes (33.1k)
CDN
cdnjs
  33885 bytes (33.1k)
CDN
gzip -6 (default)
  33693 bytes (32.9k)
local copy
Google
  33673 bytes (32.9k)
CDN
cdnhttps
  33673 bytes (32.9k)
CDN
gzip -9
  33646 bytes (32.9k)
local copy
libdeflate -12
  32530 bytes (31.8k)
local copy
7zip -mx=9 -tgzip
  32507 bytes (31.7k)
local copy
kzip -s0 -rn -b1
  32506 bytes (31.7k)
local copy
Yandex
  32469 bytes (31.7k)
CDN
pigz -11 -n
  32461 bytes (31.7k)
local copy
Zopfli
  32424 bytes (31.7k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/jquery/jquery-1.7.2.min.js (or via HTTPS)

You will automatically get the smallest jQuery 1.7.2 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 45 bytes by using my jQuery 1.7.2 Zopfli version instead of the best available CDN (0.14% smaller than Yandex, 32424 vs. 32469 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 --mls2048 --bsr22 --lazy --ohh

(found January 8, 2016)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 2048  --mls2048
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-1.7.2.min.js --location | md5sum
b8d64d0bc142b3f670cc0611b0aebcae  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-1.7.2.min.zopfli.js.gz | md5sum
b8d64d0bc142b3f670cc0611b0aebcae  -

SHA1:
curl --silent --compressed https://code.jquery.com/jquery-1.7.2.min.js --location | sha1sum
abcd2ba13348f178b17141b445bc99f1917d47af  -
curl --silent --compressed https://minime.stephan-brumme.com/files/jquery/jquery-1.7.2.min.zopfli.js.gz | sha1sum
abcd2ba13348f178b17141b445bc99f1917d47af  -

These CDNs send you the original file:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Microsoft 42690 bytes b8d64d0bc142b3f670cc0611b0aebcae (invalid)
Boot 38992 bytes b8d64d0bc142b3f670cc0611b0aebcae March 18, 2015 @ 09:42
jsdelivr 38992 bytes b8d64d0bc142b3f670cc0611b0aebcae (invalid)
cdnjs 33885 bytes b8d64d0bc142b3f670cc0611b0aebcae (invalid)
Google 33673 bytes b8d64d0bc142b3f670cc0611b0aebcae (invalid)
cdnhttps 33673 bytes b8d64d0bc142b3f670cc0611b0aebcae December 24, 2015 @ 07:33
Yandex 32469 bytes b8d64d0bc142b3f670cc0611b0aebcae June 15, 2015 @ 21:17

And some CDNs send you a different file:
CDN Size (compressed) MD5 (uncompressed) Comment / Diff Timestamp
Baidu 33892 bytes a13f7f208ba534681deadb1ec7a2e54a only whitespaces differ January 7, 2015 @ 10:16

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

Other Versions

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

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
32424 bytes -1 byte zopfli --i100000 --mls2048 --bsr22 --lazy --ohh January 8, 2016 @ 12:37
32425 bytes -2 bytes zopfli --i100000 --mls2048 --bsr10 --lazy --ohh September 1, 2015 @ 23:38
32427 bytes -5 bytes zopfli --i10000 --mls2048 --bsr10 --lazy --ohh September 1, 2015 @ 21:06
32432 bytes -8 bytes zopfli --i1000 --mls2048 --bsr10 --lazy --ohh September 1, 2015 @ 20:37
32440 bytes zopfli --i100 --mls2048 --bsr10 --lazy --ohh September 1, 2015 @ 20:21

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

Most recent activity on June 16, 2016 @ 14:40.

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
32442 32442 32441 32445 32442 32441 32441 32451 32451 32454 32429 32433 32434 32429 32437
32443 32441 32439 32438 32441 32438 32438 32439 32450 32443 32428 32428 32428 32430 32446
32440 32428 32442 32438 32442 32439 32438 32451 32427 32431 32428 32429 32430 32429 32435
32442 32428 32442 32442 32437 32435 32437 32430 32428 32444 32428 32431 32430 32430 32447
32442 32429 32442 32443 32439 32443 32441 32450 32443 32432 32424 32429 32430 32429 32434
32428 32443 32442 32437 32442 32439 32441 32451 32442 32443 32428 32426 32434 32430 32440
32442 32427 32442 32438 32443 32443 32438 32451 32442 32451 32425 32429 32435 32430 32435
32442 32441 32442 32438 32442 32427 32442 32451 32430 32432 32425 32439 32431 32429 32434
32442 32427 32441 32442 32437 32435 32438 32449 32427 32430 32424 32427 32430 32429 32440
32442 32427 32432 32438 32442 32439 32441 32451 32442 32445 32424 32429 32431 32430 32435
32428 32427 32434 32439 32441 32439 32441 32451 32434 32432 32424 32427 32430 32429 32435
32442 32427 32433 32442 32437 32439 32437 32450 32441 32431 32424 32429 32430 32429 32435
32442 32427 32442 32442 32438 32440 32441 32450 32441 32440 32424 32429 32433 32429 32440
32442 32428 32433 32436 32442 32427 32441 32450 32435 32437 32424 32426 32430 32429 32434
32440 32427 32436 32431 32441 32440 32442 32451 32435 32444 32424 32426 32431 32429 32442
32442 32441 32442 32436 32440 32436 32442 32427 32435 32440 32428 32426 32431 32429 32436
32442 32440 32442 32441 32441 32441 32438 32451 32451 32433 32427 32427 32430 32429 32447
32442 32442 32442 32432 32442 32443 32439 32451 32435 32438 32427 32440 32431 32430 32434
32442 32427 32442 32438 32441 32443 32442 32428 32427 32438 32424 32427 32430 32429 32434
32426 32427 32433 32436 32437 32443 32438 32430 32433 32444 32424 32427 32430 32430 32442
32442 32427 32428 32429 32428 32443 32438 32451 32442 32450 32424 32427 32431 32430 32445
32426 32427 32443 32439 32442 32444 32451 32451 32427 32446 32424 32424 32430 32429 32445
32428 32427 32441 32443 32440 32440 32441 32450 32434 32438 32435 32426 32431 32429 32440

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 32440 bytes 100%
1,000 32430 bytes -10 bytes 100%
10,000 32426 bytes -4 bytes 100%
100,000 32424 bytes -2 bytes 6.38%
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
32506 bytes +82 bytes (+0.25%)
32506 bytes +82 bytes (+0.25%)
32535 bytes +111 bytes (+0.34%) +29 bytes
32558 bytes +134 bytes (+0.41%) +52 bytes
32589 bytes +165 bytes (+0.51%) +83 bytes
32604 bytes +180 bytes (+0.56%) +98 bytes
32616 bytes +192 bytes (+0.59%) +110 bytes
32647 bytes +223 bytes (+0.69%) +141 bytes
32685 bytes +261 bytes (+0.80%) +179 bytes

Non-DEFLATE Algorithms

Archivers based on completely different compression algorithms often produce superior results.
Unfortunately, browsers only support gzip compression at the moment.
Algorithm Program Parameters Size Compared To Best Zopfli
ZPAQ (Wikipedia) zpaq zpaq -method 69 25893 bytes -6531 bytes (-20.14%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 26764 bytes -5660 bytes (-17.46%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 28464 bytes -3960 bytes (-12.21%)
Brotli (Wikipedia) brotli brotli -q 11 29821 bytes -2603 bytes (-8.03%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 29910 bytes -2514 bytes (-7.75%)
LZMA2 (Wikipedia) xz xz -9 30964 bytes -1460 bytes (-4.50%)
Zstandard (Wikipedia) zstd zstd -19 31667 bytes -757 bytes (-2.33%)

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