Choose a version:
28% The original file has 311328 bytes (304.0k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 87656 bytes (85.6k, 28%).

After GZIP compression these minified files vary in size:
Boot
  31957 bytes (31.2k)
CDN
cdnjs
  31957 bytes (31.2k)
CDN
gzip -6 (default)
  31724 bytes (31.0k)
local copy
gzip -9
  31661 bytes (30.9k)
local copy
unpkg
  31649 bytes (30.9k)
CDN
kzip -s0 -rn -b0
  30616 bytes (29.9k)
local copy
7zip -mx=9 -tgzip
  30601 bytes (29.9k)
local copy
libdeflate -12
  30571 bytes (29.9k)
local copy
pigz -11 -n
  30548 bytes (29.8k)
local copy
Zopfli
  30506 bytes (29.8k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/vue/vue-2.5.21.min.js (or via HTTPS)

You will automatically get the smallest Vue 2.5.21 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 1143 bytes by using my Vue 2.5.21 Zopfli version instead of the best available CDN (3.75% smaller than unpkg, 30506 vs. 31649 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 --bsr13 --lazy --ohh

(found December 14, 2018)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 64  --mls64
block splitting recursion 13  --bsr13
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-2.5.21.min.js --location | md5sum
f15aee8488ab57c0e80c77a7d10db3cd  -
curl --silent --compressed https://minime.stephan-brumme.com/files/vue/vue-2.5.21.min.zopfli.js.gz | md5sum
f15aee8488ab57c0e80c77a7d10db3cd  -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/vuejs/vue/vue-2.5.21.min.js --location | sha1sum
702a6f4e5da96f5a7dc6c075878182611f50afbc  -
curl --silent --compressed https://minime.stephan-brumme.com/files/vue/vue-2.5.21.min.zopfli.js.gz | sha1sum
702a6f4e5da96f5a7dc6c075878182611f50afbc  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 31957 bytes f15aee8488ab57c0e80c77a7d10db3cd (invalid)
cdnjs 31957 bytes f15aee8488ab57c0e80c77a7d10db3cd (invalid)
unpkg 31649 bytes f15aee8488ab57c0e80c77a7d10db3cd (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
30506 bytes -1 byte zopfli --i1000000 --mls64 --bsr13 --lazy --ohh December 14, 2018 @ 06:45
30507 bytes -3 bytes zopfli --i1000000 --mls32 --bsr15 --lazy --ohh December 14, 2018 @ 03:16
30510 bytes -2 bytes zopfli --i100000 --mls512 --bsr17 --lazy --ohh December 13, 2018 @ 19:42
30512 bytes -2 bytes zopfli --i10000 --mls32 --bsr15 --lazy --ohh December 13, 2018 @ 18:18
30514 bytes -10 bytes zopfli --i1000 --mls64 --bsr14 --lazy --ohh December 13, 2018 @ 17:38
30524 bytes zopfli --i100 --mls512 --bsr17 --lazy --ohh December 13, 2018 @ 17:22

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

Most recent activity on February 14, 2019 @ 19:04.

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
30549 30536 30539 30543 30532 30543 30536 30539 30538 30541 30551 30538 30534 30554 30535
30542 30544 30545 30545 30545 30545 30541 30541 30542 30541 30541 30539 30538 30550 30536
30534 30534 30531 30537 30535 30532 30535 30534 30538 30541 30548 30555 30552 30555 30538
30536 30539 30539 30532 30514 30536 30538 30536 30539 30537 30537 30535 30536 30553 30531
30535 30531 30530 30538 30535 30536 30539 30536 30536 30538 30548 30533 30533 30553 30539
30540 30540 30534 30533 30532 30531 30540 30535 30539 30538 30538 30534 30551 30553 30537
30537 30530 30536 30537 30519 30516 30537 30535 30520 30541 30548 30534 30534 30540 30534
30536 30535 30532 30534 30533 30530 30537 30534 30537 30537 30538 30533 30534 30547 30536
30537 30534 30537 30533 30533 30534 30538 30538 30535 30537 30550 30530 30553 30538 30536
30536 30534 30532 30533 30532 30506 30537 30539 30536 30537 30550 30536 30527 30538 30537
30535 30531 30531 30531 30534 30513 30537 30536 30518 30539 30538 30537 30531 30551 30537
30539 30535 30539 30529 30507 30532 30537 30536 30536 30537 30553 30536 30532 30544 30538
30535 30536 30532 30534 30533 30532 30538 30537 30536 30538 30548 30533 30532 30539 30535
30537 30536 30532 30532 30533 30531 30537 30537 30507 30538 30548 30554 30531 30538 30530
30538 30536 30531 30538 30533 30531 30537 30535 30540 30538 30536 30536 30528 30548 30531
30540 30539 30532 30528 30533 30533 30536 30536 30538 30538 30537 30534 30532 30548 30532
30538 30533 30531 30533 30535 30532 30533 30539 30535 30537 30539 30534 30528 30537 30533
30539 30534 30532 30532 30533 30534 30535 30538 30539 30538 30537 30534 30532 30539 30533
30535 30536 30531 30528 30534 30531 30538 30538 30537 30538 30538 30553 30532 30548 30531
30537 30539 30532 30531 30530 30531 30537 30531 30535 30538 30538 30535 30533 30537 30531
30538 30534 30531 30531 30534 30532 30537 30536 30536 30538 30537 30534 30531 30538 30531
30536 30539 30531 30532 30534 30529 30537 30534 30535 30537 30537 30533 30532 30553 30536
30539 30536 30535 30538 30533 30531 30536 30538 30535 30537 30553 30532 30553 30553 30539

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 30524 bytes 100%
1,000 30514 bytes -10 bytes 100%
10,000 30512 bytes -2 bytes 100%
100,000 30510 bytes -2 bytes 1.16%
1,000,000 30506 bytes -4 bytes 0.87%
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
30616 bytes +110 bytes (+0.36%)
30616 bytes +110 bytes (+0.36%)
30622 bytes +116 bytes (+0.38%) +6 bytes
30626 bytes +120 bytes (+0.39%) +10 bytes
30648 bytes +142 bytes (+0.47%) +32 bytes
30667 bytes +161 bytes (+0.53%) +51 bytes
30673 bytes +167 bytes (+0.55%) +57 bytes
30627 bytes +121 bytes (+0.40%) +11 bytes
30658 bytes +152 bytes (+0.50%) +42 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 25302 bytes -5204 bytes (-17.06%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 26142 bytes -4364 bytes (-14.31%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 27084 bytes -3422 bytes (-11.22%)
Brotli (Wikipedia) brotli brotli -q 11 28666 bytes -1840 bytes (-6.03%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 29311 bytes -1195 bytes (-3.92%)
LZMA2 (Wikipedia) xz xz -9 29488 bytes -1018 bytes (-3.34%)
Zstandard (Wikipedia) zstd zstd -19 30092 bytes -414 bytes (-1.36%)

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