Dojo 1.12.7 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 632881 bytes (618.0k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 165774 bytes (161.9k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	55865 bytes (54.6k)	local copy
gzip -9	55813 bytes (54.5k)	local copy
libdeflate -12	53163 bytes (51.9k)	local copy
7zip -mx=9 -tgzip	53143 bytes (51.9k)	local copy
pigz -11 -n	53074 bytes (51.8k)	local copy
zultra	53074 bytes (51.8k)	local copy
kzip -s0 -rn -b1	53070 bytes (51.8k)	local copy
Zopfli	52973 bytes (51.7k)	local copy
Zopfli (defluff)	52968 bytes (51.7k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.12.7.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.12.7 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 --i1000000 --mb8 --mls64 --bsr30 --lazy --ohh

(found March 9, 2022)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	64	--mls64
block splitting recursion	30	--bsr30
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 (52968 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-1.12.7/dojo.js --location | md5sum
224b4abe9fd69972a0b39f01b4b69d15 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.7.min.zopfli.js.gz | md5sum
224b4abe9fd69972a0b39f01b4b69d15 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.12.7/dojo.js --location | sha1sum
b5d9a973c72fba33f338294b525fe12e7734bb03 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.7.min.zopfli.js.gz | sha1sum
b5d9a973c72fba33f338294b525fe12e7734bb03 -

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
52973 bytes	-1 byte	zopfli --i1000000 --mls64 --bsr30 --lazy --ohh	March 9, 2022 @ 18:27
52974 bytes	-1 byte	zopfli --i100000 --mls64 --bsr30 --lazy --ohh	March 5, 2022 @ 20:47
52975 bytes	-7 bytes	zopfli --i100000 --mls128 --bsr13 --lazy --ohh	March 4, 2022 @ 13:44
52982 bytes	-1 byte	zopfli --i10000 --mls128 --bsr13 --lazy --ohh	February 27, 2022 @ 23:20
52983 bytes	-4 bytes	zopfli --i10000 --mls8 --bsr16 --lazy --ohh	February 25, 2022 @ 06:41
52987 bytes	-2 bytes	zopfli --i1000 --mls256 --bsr16 --lazy --ohh	February 24, 2022 @ 17:23
52989 bytes	-1 byte	zopfli --i1000 --mls8 --bsr11 --lazy --ohh	February 24, 2022 @ 17:06
52990 bytes	–	zopfli --i100 --mls8 --bsr22 --lazy --ohh	February 24, 2022 @ 15:47

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

Most recent activity on March 9, 2022 @ 21:30.

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	52986	52986	52987	52987	52989	52988	52988	52988	52999	52988	52987	52990	52998	53012	53003
4	52987	52990	52984	52985	52997	52991	52983	52985	52991	52987	52992	52994	53003	53007	52996
6	53027	52989	52985	52987	52995	52988	52994	52984	52991	52997	52991	52994	52996	52999	52999
7	53019	53022	52985	52986	52988	52990	52984	52990	52992	52989	52988	52991	52989	53011	52992
8	52989	53022	52984	52986	52984	52987	52984	52987	52991	52999	52998	52987	52996	52997	52993
9	52986	53010	52985	52984	52985	52999	52975	52984	52990	53007	52995	52995	52993	53008	52996
10	52985	53013	52984	53023	52987	52993	52994	52994	52991	52995	53010	52986	52997	52995	52993
11	53021	53019	52984	52986	52986	52989	52984	52984	52991	53008	52995	52992	52999	53009	52995
12	52985	52987	52985	53018	52983	52993	52985	52987	52991	52995	52993	52996	52993	52996	52993
13	52986	53027	52984	52987	52989	52992	52975	52986	52993	52995	52993	52987	52997	52992	52994
14	52984	53012	52984	52989	52991	52986	52983	52989	52991	52985	53009	52993	52994	52996	52993
15	53016	53017	52984	52989	52985	52986	52985	52987	52991	52995	52988	52988	52993	53011	52994
16	52987	52984	52983	52984	52985	52995	52985	52985	52993	52995	52995	52994	52993	52996	52994
17	52987	52975	52987	52984	52985	52986	52986	52991	52992	53008	52996	52994	52997	52996	52994
18	52985	53011	52987	52986	52991	52987	52996	52990	52991	53000	53007	52995	52995	53002	52991
19	53018	53013	52984	52984	52986	52995	52985	52985	52991	52994	52996	52992	52991	53001	52997
20	52984	53022	52984	52984	52986	52987	52976	52991	52991	52996	52996	52994	52994	53006	52996
21	53018	53026	52986	52984	52989	52993	52984	52987	52992	53008	52996	52988	52995	52994	52996
22	53019	53011	52976	52984	52989	52984	52983	52986	52992	52995	53010	52995	52995	52994	52996
23	52985	53014	52985	52985	52988	52987	52985	52986	52990	53008	53000	52986	52992	52996	52993
25	52984	53011	52987	52986	52987	52988	52984	52991	52991	53005	52996	52987	52991	53015	52997
30	53018	53013	52987	52986	52985	52973	52983	52985	52992	53007	52994	52993	52994	52993	52992
40	52985	53013	52983	52988	52985	52980	52983	52986	52991	52994	53000	52986	52997	52993	52993

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	52990 bytes	–	100%
1,000	52987 bytes	-3 bytes	100%
10,000	52982 bytes	-5 bytes	100%
100,000	52974 bytes	-8 bytes	2.03%
1,000,000	52973 bytes	-1 byte	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
(any)	53135 bytes	+162 bytes (+0.31%)	+65 bytes
1	53070 bytes	+97 bytes (+0.18%)	–
2	53070 bytes	+97 bytes (+0.18%)	–
3	53128 bytes	+155 bytes (+0.29%)	+58 bytes
4	53139 bytes	+166 bytes (+0.31%)	+69 bytes
5	53173 bytes	+200 bytes (+0.38%)	+103 bytes
6	53218 bytes	+245 bytes (+0.46%)	+148 bytes
7	53254 bytes	+281 bytes (+0.53%)	+184 bytes
8	53274 bytes	+301 bytes (+0.57%)	+204 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	38931 bytes	-14042 bytes (-26.51%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46468 bytes	-6505 bytes (-12.28%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47441 bytes	-5532 bytes (-10.44%)
Brotli (Wikipedia)	brotli	brotli -q 11	48911 bytes	-4062 bytes (-7.67%)
LZMA2 (Wikipedia)	xz	xz -9	49984 bytes	-2989 bytes (-5.64%)
Zstandard (Wikipedia)	zstd	zstd -19	51312 bytes	-1661 bytes (-3.14%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	51528 bytes	-1445 bytes (-2.73%)

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.