Choose a version:
30% The original file has 78296 bytes (76.5k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 23711 bytes (23.2k, 30%).

After GZIP compression these minified files vary in size:
gzip -6 (default)
  8440 bytes (8.2k)
local copy
gzip -9
  8423 bytes (8.2k)
local copy
7zip -mx=9 -tgzip
  8239 bytes (8.0k)
local copy
libdeflate -12
  8239 bytes (8.0k)
local copy
kzip -s0 -rn -b1
  8236 bytes (8.0k)
local copy
pigz -11 -n
  8230 bytes (8.0k)
local copy
Zopfli
  8219 bytes (8.0k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/knockout/knockout-1.1.0.min.js (or via HTTPS)

You will automatically get the smallest Knockout 1.1.0 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 --mls16 --bsr20 --lazy --ohh

(found December 18, 2015)
Description Value Parameter
iterations 100000  --i100000
maximum blocks 8  --mb8
maximum length score 16  --mls16
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 http://knockoutjs.com/downloads/knockout-1.1.0.js --location | md5sum
f3a0e373e359579eac5f74f9246b16c1  -
curl --silent --compressed https://minime.stephan-brumme.com/files/knockout/knockout-1.1.0.min.zopfli.js.gz | md5sum
f3a0e373e359579eac5f74f9246b16c1  -

SHA1:
curl --silent --compressed http://knockoutjs.com/downloads/knockout-1.1.0.js --location | sha1sum
bc54bc2862a14d57bd7b7c5d6b1ec94b4a16ddb7  -
curl --silent --compressed https://minime.stephan-brumme.com/files/knockout/knockout-1.1.0.min.zopfli.js.gz | sha1sum
bc54bc2862a14d57bd7b7c5d6b1ec94b4a16ddb7  -

Other Versions

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

3.4.2, 3.4.1, 3.4.0,
3.3.0,
3.2.0,
3.1.0,
3.0.0,
2.3.0,
2.2.1, 2.2.0,
2.1.0,
2.0.0,
1.2.1, 1.2.0,
1.1.2, 1.1.1, 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, jQuery, lodash, React, Socket.IO, ThreeJS, UnderscoreJS and Vue.

Changelog

Best Zopfli parameters so far:
Size Improvement Parameters Found
8219 bytes -1 byte zopfli --i100000 --mls16 --bsr20 --lazy --ohh December 18, 2015 @ 22:45
8220 bytes -1 byte zopfli --i10000 --mls16 --bsr20 --lazy --ohh November 23, 2015 @ 17:59
8221 bytes -1 byte zopfli --i1000 --mls8 --bsr14 --lazy --ohh September 18, 2015 @ 19:14
8222 bytes -1 byte zopfli --i1000 --mls2048 --bsr10 --lazy --ohh September 10, 2015 @ 12:03
8223 bytes -2 bytes zopfli --i1000 --mls512 --bsr13 --lazy --ohh September 10, 2015 @ 12:02
8225 bytes zopfli --i100 --mls8192 --bsr2 --lazy --ohh September 10, 2015 @ 11:34

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 @ 14:38.

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
8222 8222 8223 8232 8227 8223 8226 8232 8226 8232 8222 8225 8223 8224 8226
8223 8220 8223 8224 8222 8222 8224 8223 8224 8222 8222 8223 8222 8223 8223
8222 8224 8219 8219 8222 8221 8228 8224 8222 8224 8224 8227 8223 8224 8226
8225 8219 8219 8220 8223 8225 8223 8222 8222 8222 8222 8223 8224 8223 8223
8224 8226 8227 8226 8224 8225 8223 8232 8222 8224 8222 8227 8223 8224 8223
8224 8222 8223 8222 8224 8225 8223 8224 8225 8223 8222 8224 8224 8223 8223
8224 8224 8220 8222 8224 8223 8223 8223 8222 8222 8222 8224 8223 8224 8223
8222 8227 8223 8226 8221 8225 8223 8223 8222 8222 8222 8224 8223 8224 8223
8226 8227 8228 8223 8222 8225 8223 8224 8225 8224 8223 8227 8224 8224 8223
8222 8223 8223 8223 8222 8223 8222 8222 8222 8223 8222 8223 8224 8221 8223
8223 8227 8220 8222 8219 8225 8226 8223 8222 8224 8223 8223 8224 8224 8223
8225 8227 8223 8222 8222 8223 8222 8223 8224 8228 8222 8223 8223 8223 8223
8223 8227 8222 8222 8222 8225 8222 8223 8222 8224 8222 8227 8224 8224 8225
8226 8226 8228 8223 8222 8222 8222 8223 8222 8224 8223 8223 8223 8224 8222
8222 8223 8223 8222 8221 8226 8222 8222 8224 8224 8222 8223 8224 8224 8223
8222 8227 8223 8222 8222 8222 8223 8223 8223 8227 8222 8223 8224 8224 8223
8222 8226 8223 8219 8223 8222 8222 8223 8226 8227 8222 8227 8223 8224 8223
8222 8222 8222 8220 8222 8222 8222 8223 8222 8222 8222 8223 8223 8227 8224
8222 8223 8222 8225 8222 8225 8222 8223 8222 8222 8222 8226 8224 8222 8223
8224 8226 8226 8222 8222 8222 8223 8223 8222 8228 8222 8223 8225 8224 8223
8225 8227 8223 8223 8222 8222 8223 8223 8222 8228 8222 8227 8223 8224 8224
8225 8226 8228 8223 8222 8222 8222 8223 8223 8223 8222 8223 8223 8224 8223
8224 8227 8222 8224 8223 8225 8222 8224 8222 8222 8222 8223 8224 8224 8225

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 8223 bytes 100%
1,000 8221 bytes -2 bytes 100%
10,000 8220 bytes -1 byte 100%
100,000 8219 bytes -1 byte 4.35%
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
8236 bytes +17 bytes (+0.21%)
8236 bytes +17 bytes (+0.21%)
8265 bytes +46 bytes (+0.56%) +29 bytes
8299 bytes +80 bytes (+0.97%) +63 bytes
8308 bytes +89 bytes (+1.08%) +72 bytes
8335 bytes +116 bytes (+1.41%) +99 bytes
8367 bytes +148 bytes (+1.80%) +131 bytes
8398 bytes +179 bytes (+2.18%) +162 bytes
8437 bytes +218 bytes (+2.65%) +201 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 - but your browser doesn't support it.
Algorithm Program Parameters Size Compared To Best Zopfli
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 7227 bytes -992 bytes (-12.07%)
Brotli (Wikipedia) brotli brotli -q 11 7387 bytes -832 bytes (-10.12%)
ZPAQ (Wikipedia) zpaq zpaq -method 69 7896 bytes -323 bytes (-3.93%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 7967 bytes -252 bytes (-3.07%)
LZMA2 (Wikipedia) xz xz -9 8208 bytes -11 bytes (-0.13%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 8235 bytes +16 bytes (+0.19%)
Zstandard (Wikipedia) zstd zstd -19 8240 bytes +21 bytes (+0.26%)

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