Choose a version:
30% The original file has 288591 bytes (281.8k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 86328 bytes (84.3k, 30%).

After GZIP compression these minified files vary in size:
Boot
  36267 bytes (35.4k)
CDN
gzip -6 (default)
  31606 bytes (30.9k)
local copy
gzip -9
  31551 bytes (30.8k)
local copy
cdnjs
  31514 bytes (30.8k)
CDN
unpkg
  31514 bytes (30.8k)
CDN
libdeflate -12
  30500 bytes (29.8k)
local copy
7zip -mx=9 -tgzip
  30478 bytes (29.8k)
local copy
kzip -s0 -rn -b1
  30476 bytes (29.8k)
local copy
pigz -11 -n
  30407 bytes (29.7k)
local copy
Zopfli
  30371 bytes (29.7k)
local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/vue/vue-2.5.15.min.js (or via HTTPS)

You will automatically get the smallest Vue 2.5.15 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 2.5.15 Zopfli version instead of the best available CDN (3.76% smaller than unpkg, 30371 vs. 31514 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 --mls32768 --bsr22 --lazy --ohh

(found March 13, 2018)
Description Value Parameter
iterations 1000000  --i1000000
maximum blocks 8  --mb8
maximum length score 32768  --mls32768
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://raw.githubusercontent.com/vuejs/vue/vue-2.5.15.min.js --location | md5sum
e2abec980277391179633867ef3cd3ab  -
curl --silent --compressed https://minime.stephan-brumme.com/files/vue/vue-2.5.15.min.zopfli.js.gz | md5sum
e2abec980277391179633867ef3cd3ab  -

SHA1:
curl --silent --compressed https://raw.githubusercontent.com/vuejs/vue/vue-2.5.15.min.js --location | sha1sum
46868a4853ea4670e7548d327d8764135af150e7  -
curl --silent --compressed https://minime.stephan-brumme.com/files/vue/vue-2.5.15.min.zopfli.js.gz | sha1sum
46868a4853ea4670e7548d327d8764135af150e7  -

All listed CDNs deliver identical contents:
CDN Size (compressed) MD5 (uncompressed) Timestamp
Boot 36267 bytes e2abec980277391179633867ef3cd3ab March 13, 2018 @ 18:54
cdnjs 31514 bytes e2abec980277391179633867ef3cd3ab (invalid)
unpkg 31514 bytes e2abec980277391179633867ef3cd3ab (invalid)

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

Other Versions

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

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
30371 bytes -1 byte zopfli --i1000000 --mls32768 --bsr22 --lazy --ohh March 13, 2018 @ 04:42
30372 bytes -2 bytes zopfli --i1000000 --mls512 --bsr22 --lazy --ohh March 13, 2018 @ 01:04
30374 bytes -1 byte zopfli --i100000 --mls512 --bsr22 --lazy --ohh March 12, 2018 @ 17:20
30375 bytes -2 bytes zopfli --i10000 --mls512 --bsr22 --lazy --ohh March 12, 2018 @ 16:51
30377 bytes -3 bytes zopfli --i1000 --mls512 --bsr22 --lazy --ohh March 12, 2018 @ 16:36
30380 bytes -2 bytes zopfli --i1000 --mls512 --bsr25 --lazy --ohh March 12, 2018 @ 16:35
30382 bytes zopfli --i100 --mls512 --bsr25 --lazy --ohh March 12, 2018 @ 16:24

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

Most recent activity on March 13, 2018 @ 18:54.

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, 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
30414 30414 30414 30401 30411 30395 30392 30399 30400 30393 30403 30396 30391 30400 30400
30378 30378 30403 30398 30398 30396 30396 30394 30395 30399 30398 30396 30400 30408 30401
30403 30395 30393 30403 30403 30396 30397 30400 30379 30394 30400 30396 30395 30400 30398
30389 30397 30396 30403 30390 30398 30386 30395 30399 30394 30393 30393 30396 30403 30397
30413 30393 30398 30403 30397 30393 30397 30398 30398 30393 30399 30399 30396 30407 30403
30402 30400 30403 30402 30403 30391 30386 30395 30376 30396 30394 30395 30393 30405 30412
30405 30394 30402 30403 30403 30393 30397 30400 30379 30396 30395 30395 30396 30403 30401
30402 30397 30391 30404 30389 30394 30397 30383 30399 30394 30395 30395 30393 30405 30397
30391 30397 30402 30402 30403 30395 30397 30397 30396 30394 30393 30396 30395 30408 30398
30394 30397 30402 30403 30392 30397 30397 30395 30398 30394 30395 30398 30388 30405 30400
30394 30397 30402 30396 30381 30395 30397 30395 30399 30394 30392 30395 30396 30406 30398
30402 30395 30383 30404 30381 30394 30397 30395 30397 30396 30395 30395 30397 30400 30397
30398 30399 30400 30403 30403 30394 30397 30394 30394 30394 30393 30396 30399 30403 30401
30396 30399 30402 30404 30393 30396 30397 30394 30378 30394 30393 30395 30400 30403 30401
30391 30397 30402 30403 30393 30394 30397 30398 30377 30393 30394 30396 30388 30399 30399
30390 30398 30384 30403 30389 30397 30397 30395 30395 30394 30393 30396 30388 30406 30398
30394 30398 30402 30403 30392 30399 30397 30396 30384 30394 30395 30397 30395 30407 30398
30388 30399 30413 30403 30401 30395 30397 30396 30379 30393 30392 30396 30395 30405 30395
30391 30398 30390 30404 30393 30394 30397 30386 30372 30394 30395 30396 30396 30407 30371
30402 30399 30383 30403 30388 30393 30398 30388 30376 30395 30394 30394 30396 30406 30396
30391 30398 30403 30403 30406 30395 30396 30398 30378 30396 30395 30396 30398 30408 30398
30402 30397 30403 30402 30397 30394 30396 30395 30399 30395 30395 30396 30388 30405 30398
30402 30395 30402 30402 30392 30395 30383 30395 30397 30393 30392 30395 30395 30399 30398

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 30382 bytes 100%
1,000 30377 bytes -5 bytes 100%
10,000 30375 bytes -2 bytes 100%
100,000 30374 bytes -1 byte 1.45%
1,000,000 30371 bytes -3 bytes 0.58%
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
30476 bytes +105 bytes (+0.35%)
30476 bytes +105 bytes (+0.35%)
30486 bytes +115 bytes (+0.38%) +10 bytes
30488 bytes +117 bytes (+0.39%) +12 bytes
30509 bytes +138 bytes (+0.45%) +33 bytes
30534 bytes +163 bytes (+0.54%) +58 bytes
30538 bytes +167 bytes (+0.55%) +62 bytes
30498 bytes +127 bytes (+0.42%) +22 bytes
30524 bytes +153 bytes (+0.50%) +48 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 25238 bytes -5133 bytes (-16.90%)
RAR (proprietary) RAR rar a -m5 -md64m -mc63:128t -mt1 26011 bytes -4360 bytes (-14.36%)
PPMd (Wikipedia) 7zip 7za a -mx=9 -m0=ppmd 26852 bytes -3519 bytes (-11.59%)
Brotli (Wikipedia) brotli brotli -q 11 28583 bytes -1788 bytes (-5.89%)
Burrows-Wheeler transform (Wikipedia) bzip2 bzip2 -9 29095 bytes -1276 bytes (-4.20%)
LZMA2 (Wikipedia) xz xz -9 29368 bytes -1003 bytes (-3.30%)
Zstandard (Wikipedia) zstd zstd -19 30020 bytes -351 bytes (-1.16%)

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