AngularJS 1.2.25 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 783193 bytes (764.8k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 107449 bytes (104.9k, 14%).

After GZIP compression these minified files vary in size:

Boot	45467 bytes (44.4k)	CDN
cdnjs	39995 bytes (39.1k)	CDN
gzip -6 (default)	39770 bytes (38.8k)	local copy
gzip -9	39704 bytes (38.8k)	local copy
Google	39701 bytes (38.8k)	CDN
Yandex	39698 bytes (38.8k)	CDN
jsdelivr	39698 bytes (38.8k)	CDN
7zip -mx=9 -tgzip	38486 bytes (37.6k)	local copy
kzip -s0 -rn -b0	38480 bytes (37.6k)	local copy
libdeflate -12	38468 bytes (37.6k)	local copy
pigz -11 -n	38459 bytes (37.6k)	local copy
zultra	38458 bytes (37.6k)	local copy
Zopfli	38409 bytes (37.5k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/angularjs/angular-1.2.25.min.js (or via HTTPS)

You will automatically get the smallest AngularJS 1.2.25 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 1289 bytes by using my AngularJS 1.2.25 Zopfli version instead of the best available CDN (3.36% smaller than jsdelivr, 38409 vs. 39698 bytes):

Download

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 --mls4096 --bsr7 --lazy --ohh

(found November 30, 2015)

Description	Value	Parameter
iterations	100000	--i100000
maximum blocks	8	--mb8
maximum length score	4096	--mls4096
block splitting recursion	7	--bsr7
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.angularjs.org/1.2.25/angular.min.js --location | md5sum
48eeee3bd2b189eb98b3d33e561ad614 -
curl --silent --compressed https://minime.stephan-brumme.com/files/angularjs/angular-1.2.25.min.zopfli.js.gz | md5sum
48eeee3bd2b189eb98b3d33e561ad614 -

SHA1:
curl --silent --compressed https://code.angularjs.org/1.2.25/angular.min.js --location | sha1sum
239ab3800402bbf5e07cdfefb8ae9ad079f796a9 -
curl --silent --compressed https://minime.stephan-brumme.com/files/angularjs/angular-1.2.25.min.zopfli.js.gz | sha1sum
239ab3800402bbf5e07cdfefb8ae9ad079f796a9 -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	45467 bytes	48eeee3bd2b189eb98b3d33e561ad614	March 18, 2015 @ 10:33
cdnjs	39995 bytes	48eeee3bd2b189eb98b3d33e561ad614	December 18, 2014 @ 18:00
Google	39701 bytes	48eeee3bd2b189eb98b3d33e561ad614	September 17, 2014 @ 01:03
Yandex	39698 bytes	48eeee3bd2b189eb98b3d33e561ad614	June 11, 2015 @ 14:17
jsdelivr	39698 bytes	48eeee3bd2b189eb98b3d33e561ad614	October 1, 2014 @ 18:50

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

Other Versions

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

1.8.2, 1.8.1, 1.8.0,
1.7.9, 1.7.8, 1.7.7, 1.7.6, 1.7.5, 1.7.4, 1.7.3, 1.7.2, 1.7.1, 1.7.0,
1.6.10, 1.6.9, 1.6.8, 1.6.7, 1.6.6, 1.6.5, 1.6.4, 1.6.3, 1.6.2, 1.6.1, 1.6.0,
1.5.11, 1.5.10, 1.5.9, 1.5.8, 1.5.7, 1.5.6, 1.5.5, 1.5.4, 1.5.3, 1.5.2, 1.5.1, 1.5.0,
1.4.14, 1.4.13, 1.4.12, 1.4.11, 1.4.10, 1.4.9, 1.4.8, 1.4.7, 1.4.6, 1.4.5, 1.4.4, 1.4.3, 1.4.2, 1.4.1, 1.4.0,
1.3.20, 1.3.19, 1.3.18, 1.3.17, 1.3.16, 1.3.15, 1.3.14, 1.3.13, 1.3.12, 1.3.11, 1.3.10, 1.3.9, 1.3.8, 1.3.7, 1.3.6, 1.3.5, 1.3.4, 1.3.3, 1.3.2, 1.3.1, 1.3.0,
1.2.32, 1.2.31, 1.2.30, 1.2.29, 1.2.28, 1.2.27, 1.2.26, 1.2.25, 1.2.24, 1.2.23, 1.2.22, 1.2.21, 1.2.20, 1.2.19, 1.2.18, 1.2.17, 1.2.16, 1.2.15, 1.2.14, 1.2.13, 1.2.12, 1.2.11, 1.2.10, 1.2.9, 1.2.8, 1.2.7, 1.2.6, 1.2.5, 1.2.4, 1.2.3, 1.2.2, 1.2.1, 1.2.0,
1.1.5, 1.1.4, 1.1.3, 1.1.2, 1.1.1, 1.1.0,
1.0.8, 1.0.7, 1.0.6, 1.0.5, 1.0.4, 1.0.3, 1.0.2, 1.0.1, 1.0.0,
0.10.6, 0.10.5, 0.10.4, 0.10.3, 0.10.2, 0.10.1, 0.10.0,
0.9.19, 0.9.18, 0.9.17, 0.9.16, 0.9.15, 0.9.14, 0.9.13, 0.9.12, 0.9.11, 0.9.10, 0.9.9, 0.9.8, 0.9.7, 0.9.6, 0.9.5, 0.9.4, 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 BackboneJS, Bootstrap, D3, Dojo, Ember, jQuery, Knockout, lodash, React, Socket.IO, ThreeJS, UnderscoreJS and Vue.

Changelog

Best Zopfli parameters so far:

Size	Improvement	Parameters	Found
38409 bytes	-2 bytes	zopfli --i100000 --mls4096 --bsr7 --lazy --ohh	November 30, 2015 @ 10:44
38411 bytes	-1 byte	zopfli --i100000 --mls1024 --bsr8 --lazy --ohh	November 27, 2015 @ 23:43
38412 bytes	-1 byte	zopfli --i100000 --mls8192 --bsr6 --lazy --ohh	November 27, 2015 @ 23:04
38413 bytes	-1 byte	zopfli --i10000 --mls1024 --bsr8 --lazy --ohh	September 9, 2015 @ 12:31
38414 bytes	-1 byte	zopfli --i10000 --mls8192 --bsr14 --lazy --ohh	September 9, 2015 @ 12:12
38415 bytes	-1 byte	zopfli --i10000 --mls512 --bsr13 --lazy --ohh	September 9, 2015 @ 11:58
38416 bytes	-2 bytes	zopfli --i1000 --mls1024 --bsr13 --lazy --ohh	September 7, 2015 @ 19:35
38418 bytes	-2 bytes	zopfli --i1000 --mls1024 --bsr8 --lazy --ohh	September 7, 2015 @ 19:34
38420 bytes	–	zopfli --i100 --mls2048 --bsr9 --lazy --ohh	September 7, 2015 @ 16:06

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

Most recent activity on July 20, 2020 @ 12:54.

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 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
2	38415	38414	38414	38414	38416	38416	38417	38417	38418	38418	38429	38417	38416	38413	38414
4	38423	38423	38423	38420	38423	38423	38422	38423	38422	38419	38427	38419	38416	38413	38424
6	38426	38427	38424	38418	38424	38419	38422	38415	38421	38423	38427	38418	38412	38414	38423
7	38419	38420	38421	38419	38423	38416	38422	38420	38420	38421	38420	38409	38416	38419	38421
8	38419	38414	38420	38419	38419	38415	38422	38419	38427	38411	38419	38418	38416	38419	38419
9	38424	38424	38422	38419	38420	38416	38432	38429	38420	38429	38414	38415	38430	38414	38423
10	38423	38422	38419	38420	38419	38418	38422	38420	38419	38420	38428	38431	38416	38419	38421
11	38415	38416	38419	38419	38423	38415	38422	38420	38428	38416	38428	38436	38416	38413	38422
12	38419	38415	38418	38419	38421	38417	38424	38420	38419	38421	38419	38426	38415	38413	38421
13	38419	38414	38423	38418	38419	38419	38421	38419	38415	38415	38424	38418	38415	38414	38420
14	38421	38422	38420	38420	38423	38415	38420	38420	38422	38420	38425	38424	38414	38419	38420
15	38424	38424	38422	38419	38424	38415	38419	38420	38420	38421	38419	38416	38420	38413	38424
16	38423	38423	38426	38430	38424	38435	38428	38429	38429	38420	38419	38419	38415	38419	38419
17	38414	38415	38421	38419	38419	38418	38422	38428	38435	38433	38435	38431	38416	38419	38420
18	38422	38420	38420	38419	38411	38419	38422	38420	38426	38420	38419	38420	38417	38419	38420
19	38415	38414	38415	38419	38423	38419	38420	38419	38419	38420	38419	38420	38415	38419	38420
20	38415	38415	38415	38419	38419	38419	38420	38416	38420	38419	38418	38417	38416	38414	38420
21	38415	38415	38422	38418	38419	38415	38416	38415	38420	38424	38415	38425	38415	38414	38419
22	38422	38422	38421	38419	38419	38418	38420	38416	38419	38427	38426	38425	38420	38419	38420
23	38419	38414	38421	38421	38420	38414	38421	38419	38419	38419	38420	38416	38416	38414	38423
25	38415	38414	38420	38421	38420	38421	38421	38419	38419	38418	38426	38419	38415	38412	38422
30	38422	38415	38425	38418	38418	38418	38422	38423	38415	38421	38419	38425	38416	38413	38420
40	38418	38420	38416	38420	38419	38419	38423	38415	38419	38415	38425	38417	38416	38419	38421

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	38420 bytes	–	100%
1,000	38414 bytes	-6 bytes	100%
10,000	38413 bytes	-1 byte	100%
100,000	38409 bytes	-4 bytes	3.19%
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
(any)	38480 bytes	+71 bytes (+0.18%)	–
1	38484 bytes	+75 bytes (+0.20%)	+4 bytes
2	38502 bytes	+93 bytes (+0.24%)	+22 bytes
3	38534 bytes	+125 bytes (+0.33%)	+54 bytes
4	38574 bytes	+165 bytes (+0.43%)	+94 bytes
5	38566 bytes	+157 bytes (+0.41%)	+86 bytes
6	38577 bytes	+168 bytes (+0.44%)	+97 bytes
7	38616 bytes	+207 bytes (+0.54%)	+136 bytes
8	38657 bytes	+248 bytes (+0.65%)	+177 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 - for example, your browser actually supports it !

Algorithm	Program	Parameters	Size	Compared To Best Zopfli
ZPAQ (Wikipedia)	zpaq	zpaq -method 69	31112 bytes	-7297 bytes (-19.00%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	32323 bytes	-6086 bytes (-15.85%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	33868 bytes	-4541 bytes (-11.82%)
Brotli (Wikipedia)	brotli	brotli -q 11	35275 bytes	-3134 bytes (-8.16%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	36247 bytes	-2162 bytes (-5.63%)
LZMA2 (Wikipedia)	xz	xz -9	36672 bytes	-1737 bytes (-4.52%)
Zstandard (Wikipedia)	zstd	zstd -19	37607 bytes	-802 bytes (-2.09%)

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):

Load and Parse Data

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 2026.
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

All trademarks are property of their respective owners. You know, the boring legal stuff.