Dojo 1.10.8 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 634051 bytes (619.2k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 165003 bytes (161.1k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	55582 bytes (54.3k)	local copy
gzip -9	55517 bytes (54.2k)	local copy
libdeflate -12	52884 bytes (51.6k)	local copy
7zip -mx=9 -tgzip	52832 bytes (51.6k)	local copy
pigz -11 -n	52804 bytes (51.6k)	local copy
zultra	52787 bytes (51.5k)	local copy
kzip -s0 -rn -b1	52782 bytes (51.5k)	local copy
Zopfli	52692 bytes (51.5k)	local copy
Zopfli (defluff)	52689 bytes (51.5k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.10.8.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.10.8 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 --mls16 --bsr11 --lazy --ohh

(found March 15, 2022)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	16	--mls16
block splitting recursion	11	--bsr11
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 3 more bytes (52689 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-1.10.8/dojo.js --location | md5sum
3367fcdf6ae34504bd2b01d298a32269 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.10.8.min.zopfli.js.gz | md5sum
3367fcdf6ae34504bd2b01d298a32269 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.10.8/dojo.js --location | sha1sum
d45b8361bbbc11705dbe70d2480ad8a3aa16167d -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.10.8.min.zopfli.js.gz | sha1sum
d45b8361bbbc11705dbe70d2480ad8a3aa16167d -

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
52692 bytes	-2 bytes	zopfli --i1000000 --mls16 --bsr11 --lazy --ohh	March 15, 2022 @ 16:32
52694 bytes	-1 byte	zopfli --i1000000 --mls64 --bsr14 --lazy --ohh	January 29, 2020 @ 22:41
52695 bytes	-4 bytes	zopfli --i10000 --mls64 --bsr14 --lazy --ohh	March 15, 2017 @ 20:03
52699 bytes	-1 byte	zopfli --i10000 --mls4 --bsr8 --lazy --ohh	March 15, 2017 @ 18:37
52700 bytes	-6 bytes	zopfli --i10000 --mls2 --bsr20 --lazy --ohh	March 15, 2017 @ 18:21
52706 bytes	-2 bytes	zopfli --i1000 --mls512 --bsr22 --lazy --ohh	March 15, 2017 @ 15:08
52708 bytes	-2 bytes	zopfli --i1000 --mls16 --bsr4 --lazy --ohh	March 15, 2017 @ 15:07
52710 bytes	–	zopfli --i100 --mls2 --bsr15 --lazy --ohh	March 11, 2017 @ 03:00

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

Most recent activity on March 15, 2022 @ 17:09.

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 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	52705	52705	52706	52705	52708	52708	52710	52712	52745	52706	52711	52707	52718	52727	52713
4	52720	52708	52708	52700	52707	52708	52704	52703	52705	52711	52710	52703	52712	52718	52714
6	52702	52710	52706	52704	52707	52716	52714	52715	52706	52707	52711	52701	52712	52725	52715
7	52740	52742	52702	52709	52707	52707	52701	52702	52705	52706	52703	52702	52707	52725	52717
8	52702	52699	52703	52700	52708	52711	52702	52708	52718	52711	52711	52705	52714	52711	52712
9	52705	52704	52702	52707	52703	52702	52704	52701	52711	52712	52714	52725	52713	52721	52716
10	52701	52704	52705	52699	52704	52701	52701	52702	52704	52715	52707	52705	52711	52723	52718
11	52703	52701	52704	52692	52701	52702	52702	52717	52704	52714	52710	52708	52714	52714	52713
12	52702	52699	52704	52699	52701	52702	52704	52701	52710	52714	52713	52701	52710	52728	52711
13	52707	52708	52702	52707	52704	52707	52704	52701	52711	52714	52704	52710	52710	52722	52712
14	52708	52699	52702	52700	52703	52694	52701	52704	52705	52714	52711	52704	52713	52712	52714
15	52700	52699	52702	52700	52709	52702	52712	52702	52704	52713	52710	52702	52710	52721	52708
16	52705	52702	52702	52705	52709	52703	52704	52701	52705	52715	52705	52702	52713	52714	52713
17	52702	52704	52703	52700	52701	52701	52702	52702	52711	52711	52710	52706	52710	52720	52715
18	52708	52709	52703	52700	52700	52706	52717	52706	52712	52713	52712	52704	52710	52722	52714
19	52711	52701	52704	52700	52700	52700	52702	52700	52705	52713	52707	52708	52711	52710	52711
20	52700	52702	52713	52702	52700	52705	52702	52701	52704	52707	52711	52708	52711	52714	52714
21	52701	52704	52704	52692	52710	52717	52708	52717	52704	52707	52714	52708	52710	52720	52714
22	52704	52702	52702	52700	52710	52705	52702	52706	52700	52713	52706	52704	52712	52712	52716
23	52699	52700	52701	52701	52700	52702	52717	52717	52710	52711	52705	52706	52710	52711	52714
25	52703	52700	52702	52700	52702	52700	52702	52702	52705	52711	52713	52700	52710	52722	52711
30	52705	52702	52702	52701	52706	52702	52702	52704	52705	52715	52710	52704	52710	52721	52709
40	52700	52699	52705	52700	52703	52717	52703	52721	52715	52711	52710	52702	52710	52720	52711

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	52710 bytes	–	100%
1,000	52706 bytes	-4 bytes	100%
10,000	52695 bytes	-11 bytes	100%
100,000	52695 bytes	–	0.87%
1,000,000	52692 bytes	-3 bytes	0.87%
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)	52842 bytes	+150 bytes (+0.28%)	+60 bytes
1	52782 bytes	+90 bytes (+0.17%)	–
2	52814 bytes	+122 bytes (+0.23%)	+32 bytes
3	52830 bytes	+138 bytes (+0.26%)	+48 bytes
4	52842 bytes	+150 bytes (+0.28%)	+60 bytes
5	52873 bytes	+181 bytes (+0.34%)	+91 bytes
6	52905 bytes	+213 bytes (+0.40%)	+123 bytes
7	52949 bytes	+257 bytes (+0.49%)	+167 bytes
8	52969 bytes	+277 bytes (+0.53%)	+187 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	38808 bytes	-13884 bytes (-26.35%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46291 bytes	-6401 bytes (-12.15%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47201 bytes	-5491 bytes (-10.42%)
Brotli (Wikipedia)	brotli	brotli -q 11	48695 bytes	-3997 bytes (-7.59%)
LZMA2 (Wikipedia)	xz	xz -9	49744 bytes	-2948 bytes (-5.59%)
Zstandard (Wikipedia)	zstd	zstd -19	51258 bytes	-1434 bytes (-2.72%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	51497 bytes	-1195 bytes (-2.27%)

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.