Choose a version:
28% The original file has 311500 bytes (304.2k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 87745 bytes (85.7k, 28%).

After GZIP compression these minified files vary in size:
Boot
  31977 bytes (31.2k)
CDN
cdnjs
  31977 bytes (31.2k)
CDN
gzip -6 (default)
  31740 bytes (31.0k)
local copy
gzip -9
  31676 bytes (30.9k)
local copy
unpkg
  31671 bytes (30.9k)
CDN
kzip -s0 -rn -b1
  30634 bytes (29.9k)
local copy
7zip -mx=9 -tgzip
  30617 bytes (29.9k)
local copy
libdeflate -12
  30589 bytes (29.9k)
local copy
pigz -11 -n
  30562 bytes (29.8k)
local copy
Zopfli
  30521 bytes (29.8k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/vue/vue-2.5.18.min.js (or via HTTPS)

You will automatically get the smallest Vue 2.5.18 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 1150 bytes by using my Vue 2.5.18 Zopfli version instead of the best available CDN (3.77% smaller than unpkg, 30521 vs. 31671 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 --i1000000 --mb8 --mls64 --bsr11 --lazy --ohh

(found December 12, 2018)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 64  --mls64
block splitting recursion 11  --bsr11
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://raw.githubusercontent.com/vuejs/vue/vue-2.5.18.min.js --location | md5sum
7c3f9a69d7c03e619f3e1586a325e5d7  -
curl --silent --compressed https://minime.stephan-brumme.com/files/vue/vue-2.5.18.min.zopfli.js.gz | md5sum
7c3f9a69d7c03e619f3e1586a325e5d7  -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/vuejs/vue/vue-2.5.18.min.js --location | sha1sum
ed63184f684302a9656d23819cd9f3ab8ba9b9d2  -
curl --silent --compressed https://minime.stephan-brumme.com/files/vue/vue-2.5.18.min.zopfli.js.gz | sha1sum
ed63184f684302a9656d23819cd9f3ab8ba9b9d2  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 31977 bytes 7c3f9a69d7c03e619f3e1586a325e5d7 (invalid)
cdnjs 31977 bytes 7c3f9a69d7c03e619f3e1586a325e5d7 (invalid)
unpkg 31671 bytes 7c3f9a69d7c03e619f3e1586a325e5d7 (invalid)

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

Other Versions

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

2.6.10, 2.6.9, 2.6.8, 2.6.7, 2.6.6, 2.6.5, 2.6.4, 2.6.3, 2.6.2, 2.6.1, 2.6.0, 2.5.22, 2.5.21, 2.5.20, 2.5.19, 2.5.18, 2.5.17, 2.5.16, 2.5.15, 2.5.14, 2.5.13, 2.5.12, 2.5.11, 2.5.10, 2.5.9, 2.5.8, 2.5.7, 2.5.6, 2.5.5, 2.5.4, 2.5.3, 2.5.2, 2.5.1, 2.5.0, 2.4.4, 2.4.3, 2.4.2, 2.4.1, 2.4.0, 2.3.4, 2.3.3, 2.3.2, 2.3.1, 2.3.0, 2.2.6, 2.2.5, 2.2.4, 2.2.3, 2.2.2, 2.2.1, 2.2.0, 2.1.10, 2.1.9, 2.1.8, 2.1.7, 2.1.6, 2.1.5, 2.1.4, 2.1.3, 2.1.2, 2.1.1, 2.1.0, 2.0.8, 2.0.7, 2.0.6, 2.0.5, 2.0.4, 2.0.3, 2.0.2, 2.0.1, 2.0.0,
1.0.28, 1.0.27, 1.0.26, 1.0.25, 1.0.24, 1.0.23, 1.0.22, 1.0.21, 1.0.20, 1.0.19, 1.0.18, 1.0.17, 1.0.16, 1.0.15, 1.0.14, 1.0.13, 1.0.12, 1.0.11, 1.0.10, 1.0.9,
0.10.6, 0.10.5, 0.10.4, 0.10.3, 0.10.2, 0.10.1, 0.10.0,
0.9.3, 0.9.2, 0.9.1, 0.9.0

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

Changelog

Best Zopfli parameters so far:
Size Improvement Parameters Found
30521 bytes -3 bytes zopfli --i1000000 --mls64 --bsr11 --lazy --ohh December 12, 2018 @ 19:14
30524 bytes -3 bytes zopfli --i100000 --mls64 --bsr11 --lazy --ohh December 12, 2018 @ 15:43
30527 bytes -1 byte zopfli --i10000 --mls64 --bsr11 --lazy --ohh December 12, 2018 @ 12:51
30528 bytes -4 bytes zopfli --i1000 --mls64 --bsr11 --lazy --ohh December 12, 2018 @ 12:33
30532 bytes -7 bytes zopfli --i1000 --mls64 --bsr10 --lazy --ohh December 12, 2018 @ 12:32
30539 bytes zopfli --i100 --mls64 --bsr13 --lazy --ohh December 12, 2018 @ 11:39

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

Most recent activity on December 12, 2018 @ 19:14.

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
30564 30554 30553 30559 30554 30555 30555 30557 30554 30555 30562 30554 30565 30568 30551
30560 30560 30562 30561 30562 30561 30564 30556 30557 30555 30553 30554 30568 30565 30555
30555 30550 30554 30555 30555 30557 30555 30553 30554 30552 30561 30567 30566 30550 30560
30554 30549 30554 30552 30547 30553 30557 30557 30552 30551 30551 30550 30548 30554 30549
30553 30548 30550 30552 30553 30554 30555 30553 30550 30551 30551 30550 30551 30568 30551
30555 30547 30548 30554 30547 30547 30555 30554 30555 30552 30552 30566 30566 30564 30553
30549 30552 30555 30530 30525 30530 30538 30552 30554 30553 30553 30548 30551 30554 30553
30556 30552 30547 30548 30548 30521 30554 30556 30554 30552 30552 30566 30566 30567 30552
30548 30549 30547 30546 30548 30548 30555 30556 30555 30552 30551 30569 30566 30553 30551
30554 30548 30548 30553 30548 30525 30556 30554 30553 30552 30552 30569 30547 30554 30550
30549 30551 30547 30550 30554 30550 30556 30553 30555 30553 30552 30550 30549 30566 30551
30554 30548 30554 30559 30548 30553 30531 30553 30555 30552 30553 30565 30551 30558 30552
30552 30548 30547 30551 30549 30554 30555 30554 30554 30553 30561 30549 30549 30557 30550
30553 30547 30548 30547 30548 30550 30552 30553 30549 30552 30561 30567 30546 30564 30552
30550 30548 30547 30550 30547 30548 30554 30556 30550 30552 30551 30549 30546 30562 30550
30548 30550 30557 30549 30547 30548 30552 30552 30554 30552 30551 30565 30549 30561 30551
30550 30549 30549 30547 30548 30548 30554 30554 30552 30552 30551 30552 30546 30552 30552
30554 30550 30554 30547 30546 30548 30554 30554 30553 30552 30551 30567 30551 30555 30550
30551 30548 30545 30552 30555 30549 30556 30553 30553 30553 30551 30567 30546 30568 30550
30553 30550 30552 30548 30548 30549 30554 30555 30554 30553 30552 30549 30551 30554 30553
30552 30549 30549 30547 30548 30548 30555 30553 30556 30552 30553 30549 30547 30554 30552
30555 30550 30550 30551 30546 30547 30554 30552 30555 30552 30551 30550 30548 30555 30552
30553 30548 30548 30550 30555 30548 30555 30553 30553 30552 30566 30569 30566 30564 30551

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 30539 bytes 100%
1,000 30528 bytes -11 bytes 100%
10,000 30527 bytes -1 byte 100%
100,000 30524 bytes -3 bytes 0.87%
1,000,000 30521 bytes -3 bytes 0.29%
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
30634 bytes +113 bytes (+0.37%)
30634 bytes +113 bytes (+0.37%)
30641 bytes +120 bytes (+0.39%) +7 bytes
30644 bytes +123 bytes (+0.40%) +10 bytes
30672 bytes +151 bytes (+0.49%) +38 bytes
30686 bytes +165 bytes (+0.54%) +52 bytes
30687 bytes +166 bytes (+0.54%) +53 bytes
30642 bytes +121 bytes (+0.40%) +8 bytes
30668 bytes +147 bytes (+0.48%) +34 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
ZPAQ (Wikipedia) zpaq zpaq -method 69 25318 bytes -5203 bytes (-17.05%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 26156 bytes -4365 bytes (-14.30%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 27099 bytes -3422 bytes (-11.21%)
Brotli (Wikipedia) brotli brotli -q 11 28698 bytes -1823 bytes (-5.97%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 29323 bytes -1198 bytes (-3.93%)
LZMA2 (Wikipedia) xz xz -9 29488 bytes -1033 bytes (-3.38%)
Zstandard (Wikipedia) zstd zstd -19 30103 bytes -418 bytes (-1.37%)

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 2019.
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