Dojo 1.12.5 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 632889 bytes (618.1k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 165782 bytes (161.9k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	55868 bytes (54.6k)	local copy
gzip -9	55815 bytes (54.5k)	local copy
libdeflate -12	53165 bytes (51.9k)	local copy
7zip -mx=9 -tgzip	53145 bytes (51.9k)	local copy
zultra	53076 bytes (51.8k)	local copy
pigz -11 -n	53074 bytes (51.8k)	local copy
kzip -s0 -rn -b1	53072 bytes (51.8k)	local copy
Zopfli	52975 bytes (51.7k)	local copy
Zopfli (defluff)	52970 bytes (51.7k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.12.5.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.12.5 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 --mls8 --bsr8 --lazy --ohh

(found February 21, 2019)

Description	Value	Parameter
iterations	100000	--i100000
maximum blocks	8	--mb8
maximum length score	8	--mls8
block splitting recursion	8	--bsr8
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

Even Smaller Files Thanks To Defluff

Zopfli's output can be further optimized by the defluff tool.
In this particular case, defluff saves 5 more bytes (52970 bytes).

Download

Verify file integrity

After decompression, my uncompressed files are identical to the original ones:

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.12.5/dojo.js --location | md5sum
1da97fabdad5948bcab455119e7ab428 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.5.min.zopfli.js.gz | md5sum
1da97fabdad5948bcab455119e7ab428 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.12.5/dojo.js --location | sha1sum
a77ee64dc5b6ef19fa573a28f2c285d1b9372023 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.5.min.zopfli.js.gz | sha1sum
a77ee64dc5b6ef19fa573a28f2c285d1b9372023 -

Other Versions

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

1.17.3, 1.17.2, 1.17.1, 1.17.0,
1.16.5, 1.16.4, 1.16.3, 1.16.2, 1.16.1, 1.16.0,
1.15.6, 1.15.5, 1.15.4, 1.15.3, 1.15.2, 1.15.1, 1.15.0,
1.14.9, 1.14.8, 1.14.7, 1.14.6, 1.14.5, 1.14.4, 1.14.3, 1.14.2, 1.14.1, 1.14.0,
1.13.10, 1.13.9, 1.13.8, 1.13.7, 1.13.6, 1.13.5, 1.13.4, 1.13.3, 1.13.2, 1.13.1, 1.13.0,
1.12.11, 1.12.10, 1.12.9, 1.12.8, 1.12.7, 1.12.6, 1.12.5, 1.12.4, 1.12.3, 1.12.2, 1.12.1,
1.11.13, 1.11.12, 1.11.11, 1.11.10, 1.11.9, 1.11.8, 1.11.7, 1.11.6, 1.11.5, 1.11.4, 1.11.3, 1.11.2, 1.11.1, 1.11.0,
1.10.10, 1.10.9, 1.10.8, 1.10.7, 1.10.6, 1.10.5, 1.10.4, 1.10.3, 1.10.2, 1.10.1, 1.10.0,
1.9.11, 1.9.10, 1.9.9, 1.9.8, 1.9.7, 1.9.6, 1.9.5, 1.9.4, 1.9.3, 1.9.2, 1.9.1, 1.9.0,
1.8.14, 1.8.13, 1.8.12, 1.8.11, 1.8.10, 1.8.9, 1.8.8, 1.8.7, 1.8.6, 1.8.5, 1.8.4, 1.8.3, 1.8.2, 1.8.1, 1.8.0,
1.7.12, 1.7.11, 1.7.10, 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,
1.6.5, 1.6.4, 1.6.3, 1.6.2, 1.6.1, 1.6.0,
1.5.6, 1.5.5, 1.5.4, 1.5.3, 1.5.2, 1.5.1, 1.5.0,
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,
1.3.3, 1.3.2, 1.3.1, 1.3.0,
1.2.3, 1.2.2

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

Changelog

Best Zopfli parameters so far:

Size	Improvement	Parameters	Found
52975 bytes	-1 byte	zopfli --i100000 --mls8 --bsr8 --lazy --ohh	February 21, 2019 @ 20:36
52976 bytes	-1 byte	zopfli --i100000 --mls8 --bsr40 --lazy --ohh	February 21, 2019 @ 19:52
52977 bytes	-1 byte	zopfli --i100000 --mls8 --bsr10 --lazy --ohh	February 21, 2019 @ 17:49
52978 bytes	-6 bytes	zopfli --i100000 --mls128 --bsr15 --lazy --ohh	February 19, 2019 @ 23:35
52984 bytes	-1 byte	zopfli --i10000 --mls128 --bsr15 --lazy --ohh	February 19, 2019 @ 16:32
52985 bytes	-3 bytes	zopfli --i10000 --mls2 --bsr25 --lazy --ohh	February 19, 2019 @ 14:11
52988 bytes	-1 byte	zopfli --i1000 --mls128 --bsr13 --lazy --ohh	February 19, 2019 @ 08:31
52989 bytes	-2 bytes	zopfli --i1000 --mls128 --bsr20 --lazy --ohh	February 19, 2019 @ 07:41
52991 bytes	–	zopfli --i100 --mls16 --bsr11 --lazy --ohh	February 18, 2019 @ 19:15

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

Most recent activity on March 17, 2022 @ 17:13.

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
2	52987	52988	52988	52990	52990	52987	52988	52988	52987	52989	52990	52990	52999	53019	53007
4	52986	52994	52986	52989	52998	52991	52986	52986	52992	52988	52992	52994	53004	53008	52997
6	53027	53019	52985	52987	52997	52989	52997	52985	52993	52995	52991	52995	52996	53000	53000
7	53027	53023	52988	52990	52986	52987	52985	52990	52993	52988	52989	52992	52998	53012	52994
8	53015	53027	52975	53000	52999	52987	52988	52988	53002	52999	52999	52989	52998	53001	52994
9	52987	53011	52985	52986	52986	53000	52976	52986	52992	53006	52995	52998	52994	53009	53000
10	52986	53015	52977	53030	52989	52994	52996	52992	52992	52995	53009	52986	52997	53009	52994
11	53022	53009	52986	52987	52987	52989	52985	52985	52993	53006	52995	52994	52996	53010	52994
12	52986	52986	52985	53019	52985	52994	52985	52989	52993	52995	52995	52997	52995	53003	52995
13	52987	52987	52978	52989	52990	52995	52976	52980	52994	52995	52995	52990	52999	52991	52996
14	52985	52976	52986	52988	52991	52988	52985	52989	52992	52985	53008	52994	52996	52990	52994
15	53019	53012	52987	52991	52986	52990	52978	52988	52992	52996	52988	52990	52998	53011	52994
16	52989	53014	52986	52985	52987	52996	52986	52986	52994	52995	52995	52994	52994	53009	52995
17	52988	52985	52987	52986	52987	52988	52987	52993	52993	53007	52996	52995	52998	53012	52995
18	53019	53011	52988	52987	52989	52989	52992	52992	52993	53001	53008	52998	52996	53003	52993
19	53019	53014	52978	52986	52987	52994	52985	52985	52992	52995	52996	52990	52997	53002	52998
20	52985	53012	52977	52986	52988	52989	52986	52992	52993	52997	52997	52994	52997	53007	52999
21	53019	53013	52988	52986	52990	52994	52986	52989	52993	53007	52997	52990	52997	52995	52997
22	53021	53012	52976	52986	52991	52986	52985	52988	52993	52996	52993	52997	52996	52995	52997
23	52988	53015	52985	52986	52990	52975	52987	52987	52992	53005	53000	52987	52993	53007	52994
25	52985	53011	52988	52987	52986	52990	52985	52993	52992	53005	52996	52987	53000	53016	52999
30	53020	53014	52988	52986	52987	52985	52986	52987	52993	53005	52995	52994	52996	52994	52994
40	52986	53014	52976	52990	52987	52980	52986	52989	52992	52995	53000	52987	52999	53010	52994

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	52991 bytes	–	100%
1,000	52988 bytes	-3 bytes	100%
10,000	52984 bytes	-4 bytes	100%
100,000	52975 bytes	-9 bytes	4.35%
1,000,000	52975 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
(any)	53123 bytes	+148 bytes (+0.28%)	+51 bytes
1	53072 bytes	+97 bytes (+0.18%)	–
2	53073 bytes	+98 bytes (+0.18%)	+1 byte
3	53116 bytes	+141 bytes (+0.27%)	+44 bytes
4	53121 bytes	+146 bytes (+0.28%)	+49 bytes
5	53169 bytes	+194 bytes (+0.37%)	+97 bytes
6	53213 bytes	+238 bytes (+0.45%)	+141 bytes
7	53256 bytes	+281 bytes (+0.53%)	+184 bytes
8	53266 bytes	+291 bytes (+0.55%)	+194 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	38929 bytes	-14046 bytes (-26.51%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46474 bytes	-6501 bytes (-12.27%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47442 bytes	-5533 bytes (-10.44%)
Brotli (Wikipedia)	brotli	brotli -q 11	48954 bytes	-4021 bytes (-7.59%)
LZMA2 (Wikipedia)	xz	xz -9	49980 bytes	-2995 bytes (-5.65%)
Zstandard (Wikipedia)	zstd	zstd -19	51309 bytes	-1666 bytes (-3.14%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	51539 bytes	-1436 bytes (-2.71%)

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.