Dojo 1.13.10 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 637504 bytes (622.6k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 167410 bytes (163.5k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	56269 bytes (55.0k)	local copy
gzip -9	56207 bytes (54.9k)	local copy
7zip -mx=9 -tgzip	53542 bytes (52.3k)	local copy
libdeflate -12	53535 bytes (52.3k)	local copy
kzip -s0 -rn -b1	53477 bytes (52.2k)	local copy
zultra	53466 bytes (52.2k)	local copy
pigz -11 -n	53463 bytes (52.2k)	local copy
Zopfli	53376 bytes (52.1k)	local copy
Zopfli (defluff)	53375 bytes (52.1k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.13.10.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.13.10 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 --i1000000 --mb8 --mls256 --bsr11 --lazy --ohh

(found March 7, 2022)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	256	--mls256
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 1 more byte (53375 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-1.13.10/dojo.js --location | md5sum
73e30c90488c659844918ff1d9d363e9 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.10.min.zopfli.js.gz | md5sum
73e30c90488c659844918ff1d9d363e9 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.13.10/dojo.js --location | sha1sum
1d9deecd40ab016ec0081a206e7cf92b5db48f0c -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.13.10.min.zopfli.js.gz | sha1sum
1d9deecd40ab016ec0081a206e7cf92b5db48f0c -

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
53376 bytes	-2 bytes	zopfli --i1000000 --mls256 --bsr11 --lazy --ohh	March 7, 2022 @ 19:40
53378 bytes	-1 byte	zopfli --i100000 --mls256 --bsr25 --lazy --ohh	March 5, 2022 @ 01:45
53379 bytes	-2 bytes	zopfli --i100000 --mls512 --bsr2 --lazy --ohh	March 4, 2022 @ 22:57
53381 bytes	-2 bytes	zopfli --i10000 --mls512 --bsr2 --lazy --ohh	February 25, 2022 @ 14:49
53383 bytes	-1 byte	zopfli --i10000 --mls8 --bsr22 --lazy --ohh	February 25, 2022 @ 13:07
53384 bytes	-4 bytes	zopfli --i10000 --mls8 --bsr18 --lazy --ohh	February 25, 2022 @ 08:59
53388 bytes	-1 byte	zopfli --i1000 --mls512 --bsr2 --lazy --ohh	February 24, 2022 @ 22:00
53389 bytes	-1 byte	zopfli --i1000 --mls4 --bsr9 --lazy --ohh	February 24, 2022 @ 17:56
53390 bytes	-1 byte	zopfli --i1000 --mls8 --bsr15 --lazy --ohh	February 24, 2022 @ 17:43
53391 bytes	–	zopfli --i100 --mls4 --bsr8 --lazy --ohh	February 24, 2022 @ 15:30

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 @ 18:19.

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	53386	53390	53387	53387	53384	53385	53386	53387	53379	53391	53400	53401	53382	53407	53414
4	53409	53405	53385	53394	53389	53391	53392	53383	53391	53388	53394	53392	53390	53395	53389
6	53421	53386	53384	53383	53384	53392	53387	53392	53391	53387	53386	53395	53385	53393	53393
7	53412	53422	53414	53387	53384	53396	53382	53391	53391	53388	53410	53394	53387	53400	53390
8	53387	53384	53384	53385	53386	53395	53383	53384	53394	53396	53394	53395	53392	53393	53391
9	53388	53384	53387	53388	53388	53390	53387	53387	53387	53387	53394	53394	53391	53397	53389
10	53383	53384	53384	53417	53389	53393	53387	53386	53391	53393	53393	53395	53395	53389	53389
11	53386	53384	53384	53386	53392	53394	53382	53376	53388	53390	53409	53392	53395	53398	53400
12	53411	53408	53383	53415	53388	53386	53385	53386	53388	53403	53392	53398	53386	53398	53391
13	53408	53421	53384	53384	53384	53390	53387	53386	53387	53386	53393	53394	53392	53401	53388
14	53382	53386	53383	53411	53389	53397	53387	53386	53384	53394	53393	53395	53389	53390	53395
15	53404	53413	53384	53384	53385	53387	53384	53386	53392	53388	53394	53395	53397	53410	53388
16	53411	53405	53387	53414	53382	53392	53386	53392	53387	53392	53393	53390	53396	53391	53387
17	53406	53384	53387	53386	53388	53396	53385	53391	53391	53408	53394	53394	53388	53406	53393
18	53409	53416	53384	53385	53383	53390	53384	53388	53391	53409	53393	53394	53390	53390	53390
19	53413	53410	53384	53386	53385	53407	53382	53385	53392	53407	53393	53392	53387	53391	53393
20	53410	53406	53384	53384	53393	53386	53387	53391	53388	53394	53408	53398	53390	53392	53401
21	53404	53405	53387	53387	53385	53383	53382	53376	53388	53386	53394	53392	53385	53391	53403
22	53410	53419	53383	53387	53388	53395	53387	53388	53396	53385	53412	53397	53391	53391	53389
23	53384	53415	53383	53386	53383	53393	53382	53376	53391	53385	53397	53394	53392	53389	53386
25	53408	53403	53384	53410	53385	53388	53391	53376	53389	53389	53394	53391	53386	53394	53389
30	53405	53404	53384	53384	53388	53391	53383	53386	53387	53407	53407	53395	53386	53390	53385
40	53409	53383	53384	53387	53382	53386	53384	53384	53391	53386	53392	53394	53399	53390	53390

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	53391 bytes	–	100%
1,000	53388 bytes	-3 bytes	100%
10,000	53381 bytes	-7 bytes	100%
100,000	53377 bytes	-4 bytes	2.32%
1,000,000	53376 bytes	-1 byte	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)	53544 bytes	+168 bytes (+0.31%)	+67 bytes
1	53477 bytes	+101 bytes (+0.19%)	–
2	53504 bytes	+128 bytes (+0.24%)	+27 bytes
3	53522 bytes	+146 bytes (+0.27%)	+45 bytes
4	53543 bytes	+167 bytes (+0.31%)	+66 bytes
5	53557 bytes	+181 bytes (+0.34%)	+80 bytes
6	53606 bytes	+230 bytes (+0.43%)	+129 bytes
7	53617 bytes	+241 bytes (+0.45%)	+140 bytes
8	53613 bytes	+237 bytes (+0.44%)	+136 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	39209 bytes	-14167 bytes (-26.54%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46846 bytes	-6530 bytes (-12.23%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47819 bytes	-5557 bytes (-10.41%)
Brotli (Wikipedia)	brotli	brotli -q 11	49244 bytes	-4132 bytes (-7.74%)
LZMA2 (Wikipedia)	xz	xz -9	50372 bytes	-3004 bytes (-5.63%)
Zstandard (Wikipedia)	zstd	zstd -19	51693 bytes	-1683 bytes (-3.15%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	51921 bytes	-1455 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.