Dojo 1.12.10 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 633111 bytes (618.3k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 165941 bytes (162.1k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	55933 bytes (54.6k)	local copy
gzip -9	55876 bytes (54.6k)	local copy
libdeflate -12	53235 bytes (52.0k)	local copy
7zip -mx=9 -tgzip	53213 bytes (52.0k)	local copy
zultra	53144 bytes (51.9k)	local copy
kzip -s0 -rn -b1	53143 bytes (51.9k)	local copy
pigz -11 -n	53142 bytes (51.9k)	local copy
Zopfli	53043 bytes (51.8k)	local copy
Zopfli (defluff)	53042 bytes (51.8k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.12.10.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.12.10 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 --bsr40 --lazy --ohh

(found March 4, 2022)

Description	Value	Parameter
iterations	100000	--i100000
maximum blocks	8	--mb8
maximum length score	8	--mls8
block splitting recursion	40	--bsr40
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 1 more byte (53042 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-1.12.10/dojo.js --location | md5sum
51c0a31f33b9b773c4281b614371c8c5 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.10.min.zopfli.js.gz | md5sum
51c0a31f33b9b773c4281b614371c8c5 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.12.10/dojo.js --location | sha1sum
ba34075e086f27e18acee032e88c857442572230 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.12.10.min.zopfli.js.gz | sha1sum
ba34075e086f27e18acee032e88c857442572230 -

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
53043 bytes	-1 byte	zopfli --i100000 --mls8 --bsr40 --lazy --ohh	March 4, 2022 @ 21:10
53044 bytes	-6 bytes	zopfli --i100000 --mls8 --bsr14 --lazy --ohh	March 4, 2022 @ 15:34
53050 bytes	-1 byte	zopfli --i10000 --mls8 --bsr14 --lazy --ohh	February 26, 2022 @ 11:26
53051 bytes	-2 bytes	zopfli --i10000 --mls64 --bsr10 --lazy --ohh	February 25, 2022 @ 14:57
53053 bytes	-2 bytes	zopfli --i10000 --mls8 --bsr6 --lazy --ohh	February 25, 2022 @ 05:46
53055 bytes	-1 byte	zopfli --i1000 --mls32 --bsr8 --lazy --ohh	February 24, 2022 @ 23:11
53056 bytes	-1 byte	zopfli --i1000 --mls4 --bsr14 --lazy --ohh	February 24, 2022 @ 20:42
53057 bytes	-1 byte	zopfli --i1000 --mls32 --bsr25 --lazy --ohh	February 24, 2022 @ 17:36
53058 bytes	–	zopfli --i100 --mls16 --bsr11 --lazy --ohh	February 24, 2022 @ 16:41

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

Most recent activity on March 8, 2022 @ 18:50.

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	53057	53055	53055	53057	53056	53057	53056	53055	53055	53055	53064	53056	53062	53082	53092
4	53092	53054	53056	53053	53055	53055	53051	53054	53059	53065	53063	53057	53060	53064	53078
6	53093	53093	53053	53055	53060	53057	53052	53054	53060	53074	53073	53062	53063	53064	53059
7	53089	53087	53062	53093	53054	53052	53055	53052	53060	53061	53076	53062	53056	53078	53059
8	53085	53082	53052	53098	53051	53067	53052	53055	53065	53103	53065	53054	53069	53065	53065
9	53096	53082	53055	53058	53054	53056	53043	53054	53059	53073	53063	53056	53066	53064	53070
10	53095	53083	53054	53091	53055	53051	53060	53052	53059	53064	53077	53056	53069	53065	53069
11	53086	53076	53053	53053	53057	53054	53051	53053	53056	53067	53064	53062	53065	53072	53066
12	53056	53054	53051	53085	53056	53064	53055	53055	53059	53063	53064	53064	53064	53069	53065
13	53089	53078	53055	53055	53057	53062	53043	53055	53059	53065	53062	53055	53067	53080	53065
14	53051	53051	53044	53090	53056	53056	53056	53055	53059	53065	53074	53062	53066	53072	53065
15	53087	53088	53051	53056	53052	53058	53043	53054	53059	53064	53076	53062	53065	53079	53060
16	53057	53078	53056	53090	53054	53057	53056	53056	53060	53066	53061	53055	53066	53065	53060
17	53090	53072	53056	53085	53054	53055	53055	53059	53060	53070	53063	53061	53069	53061	53064
18	53086	53084	53056	53055	53054	53057	53051	53059	53059	53065	53076	53062	53065	53069	53065
19	53089	53092	53051	53052	53054	53071	53056	53053	53061	53063	53064	53064	53066	53067	53071
20	53087	53094	53052	53052	53057	53055	53056	53059	53060	53065	53076	53062	53064	53074	53073
21	53085	53081	53053	53052	53059	53070	53058	53054	53060	53066	53066	53057	53069	53061	53073
22	53086	53081	53044	53052	53058	53063	53055	53054	53060	53064	53079	53061	53064	53058	53066
23	53089	53081	53052	53092	53054	53054	53055	53053	53060	53064	53066	53056	53064	53078	53072
25	53087	53081	53056	53055	53053	53057	53056	53059	53060	53066	53064	53062	53067	53075	53069
30	53084	53076	53054	53053	53053	53048	53051	53053	53060	53063	53061	53063	53066	53061	53070
40	53085	53094	53043	53055	53052	53050	53056	53053	53059	53063	53076	53061	53069	53061	53064

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	53058 bytes	–	100%
1,000	53055 bytes	-3 bytes	100%
10,000	53050 bytes	-5 bytes	100%
100,000	53043 bytes	-7 bytes	2.90%
1,000,000	53043 bytes	–	1.16%
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)	53167 bytes	+124 bytes (+0.23%)	+24 bytes
1	53143 bytes	+100 bytes (+0.19%)	–
2	53172 bytes	+129 bytes (+0.24%)	+29 bytes
3	53190 bytes	+147 bytes (+0.28%)	+47 bytes
4	53225 bytes	+182 bytes (+0.34%)	+82 bytes
5	53247 bytes	+204 bytes (+0.38%)	+104 bytes
6	53292 bytes	+249 bytes (+0.47%)	+149 bytes
7	53312 bytes	+269 bytes (+0.51%)	+169 bytes
8	53299 bytes	+256 bytes (+0.48%)	+156 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	38989 bytes	-14054 bytes (-26.50%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46543 bytes	-6500 bytes (-12.25%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47516 bytes	-5527 bytes (-10.42%)
Brotli (Wikipedia)	brotli	brotli -q 11	48947 bytes	-4096 bytes (-7.72%)
LZMA2 (Wikipedia)	xz	xz -9	50044 bytes	-2999 bytes (-5.65%)
Zstandard (Wikipedia)	zstd	zstd -19	51364 bytes	-1679 bytes (-3.17%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	51571 bytes	-1472 bytes (-2.78%)

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.