Dojo 1.14.4 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 638930 bytes (624.0k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 167708 bytes (163.8k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	56330 bytes (55.0k)	local copy
gzip -9	56263 bytes (54.9k)	local copy
libdeflate -12	53578 bytes (52.3k)	local copy
7zip -mx=9 -tgzip	53565 bytes (52.3k)	local copy
kzip -s0 -rn -b1	53489 bytes (52.2k)	local copy
zultra	53487 bytes (52.2k)	local copy
pigz -11 -n	53469 bytes (52.2k)	local copy
Zopfli	53394 bytes (52.1k)	local copy
Zopfli (defluff)	53390 bytes (52.1k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.14.4.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.14.4 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 --mls8 --bsr15 --lazy --ohh

(found December 2, 2019)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	8	--mls8
block splitting recursion	15	--bsr15
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 4 more bytes (53390 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-1.14.4/dojo.js --location | md5sum
b61971358d52e1e6d4680e58ad45506e -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.14.4.min.zopfli.js.gz | md5sum
b61971358d52e1e6d4680e58ad45506e -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.14.4/dojo.js --location | sha1sum
6d4336d1808c5cae92e6ebc25037da87ea52341f -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.14.4.min.zopfli.js.gz | sha1sum
6d4336d1808c5cae92e6ebc25037da87ea52341f -

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
53394 bytes	-5 bytes	zopfli --i1000000 --mls8 --bsr15 --lazy --ohh	December 2, 2019 @ 16:27
53399 bytes	-1 byte	zopfli --i100000 --mls8 --bsr15 --lazy --ohh	December 1, 2019 @ 23:44
53400 bytes	-1 byte	zopfli --i10000 --mls8 --bsr15 --lazy --ohh	November 30, 2019 @ 18:37
53401 bytes	-1 byte	zopfli --i10000 --mls128 --bsr17 --lazy --ohh	November 30, 2019 @ 05:16
53402 bytes	-1 byte	zopfli --i10000 --mls16 --bsr40 --lazy --ohh	November 30, 2019 @ 04:09
53403 bytes	-5 bytes	zopfli --i10000 --mls4 --bsr20 --lazy --ohh	November 30, 2019 @ 00:13
53408 bytes	-3 bytes	zopfli --i10000 --mls4096 --bsr9 --lazy --ohh	November 29, 2019 @ 23:37
53411 bytes	-1 byte	zopfli --i1000 --mls64 --bsr12 --lazy --ohh	November 29, 2019 @ 21:00
53412 bytes	-3 bytes	zopfli --i1000 --mls64 --bsr11 --lazy --ohh	November 29, 2019 @ 20:23
53415 bytes	–	zopfli --i100 --mls128 --bsr30 --lazy --ohh	November 29, 2019 @ 19:33

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

Most recent activity on February 24, 2022 @ 16:45.

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	53402	53403	53409	53411	53405	53402	53409	53407	53422	53426	53412	53406	53406	53440	53413
4	53403	53402	53408	53409	53419	53420	53403	53402	53415	53410	53425	53412	53403	53417	53408
6	53434	53410	53403	53409	53409	53413	53401	53401	53416	53416	53419	53424	53414	53422	53417
7	53443	53403	53406	53442	53419	53418	53404	53415	53409	53409	53417	53410	53403	53423	53413
8	53401	53434	53428	53441	53402	53417	53405	53406	53414	53422	53425	53413	53404	53420	53416
9	53435	53440	53412	53403	53409	53406	53409	53406	53414	53414	53419	53408	53401	53437	53416
10	53407	53433	53405	53445	53415	53401	53408	53403	53414	53416	53419	53402	53403	53429	53417
11	53407	53431	53408	53403	53409	53401	53408	53408	53414	53414	53417	53408	53411	53429	53416
12	53402	53409	53405	53440	53408	53402	53404	53401	53414	53415	53420	53412	53414	53419	53418
13	53440	53431	53408	53403	53416	53414	53401	53407	53414	53414	53421	53404	53409	53421	53418
14	53402	53409	53438	53403	53410	53418	53403	53409	53414	53415	53416	53413	53413	53427	53412
15	53429	53403	53394	53403	53420	53413	53405	53408	53414	53414	53422	53411	53402	53423	53421
16	53401	53401	53402	53411	53410	53418	53401	53403	53414	53413	53417	53413	53403	53422	53416
17	53401	53406	53407	53438	53408	53412	53401	53416	53415	53415	53420	53413	53412	53423	53418
18	53429	53406	53408	53403	53407	53409	53401	53415	53414	53414	53419	53412	53412	53424	53421
19	53408	53412	53408	53440	53408	53417	53402	53402	53415	53415	53420	53409	53403	53424	53419
20	53403	53403	53408	53403	53409	53418	53405	53415	53414	53415	53423	53416	53403	53417	53419
21	53430	53403	53407	53403	53407	53411	53401	53406	53414	53415	53415	53403	53412	53422	53414
22	53428	53430	53406	53403	53405	53416	53401	53407	53415	53414	53417	53412	53415	53419	53414
23	53402	53403	53434	53407	53406	53418	53408	53414	53415	53414	53419	53403	53405	53423	53418
25	53402	53430	53409	53438	53407	53412	53402	53415	53415	53415	53417	53413	53414	53421	53417
30	53396	53408	53408	53435	53408	53420	53405	53403	53416	53414	53419	53403	53423	53429	53417
40	53432	53432	53411	53402	53407	53415	53404	53404	53414	53414	53416	53412	53410	53423	53417

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	53415 bytes	–	100%
1,000	53411 bytes	-4 bytes	100%
10,000	53400 bytes	-11 bytes	100%
100,000	53399 bytes	-1 byte	0.58%
1,000,000	53394 bytes	-5 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)	53564 bytes	+170 bytes (+0.32%)	+75 bytes
1	53489 bytes	+95 bytes (+0.18%)	–
2	53517 bytes	+123 bytes (+0.23%)	+28 bytes
3	53542 bytes	+148 bytes (+0.28%)	+53 bytes
4	53564 bytes	+170 bytes (+0.32%)	+75 bytes
5	53575 bytes	+181 bytes (+0.34%)	+86 bytes
6	53565 bytes	+171 bytes (+0.32%)	+76 bytes
7	53601 bytes	+207 bytes (+0.39%)	+112 bytes
8	53621 bytes	+227 bytes (+0.43%)	+132 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	39290 bytes	-14104 bytes (-26.41%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46876 bytes	-6518 bytes (-12.21%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47821 bytes	-5573 bytes (-10.44%)
Brotli (Wikipedia)	brotli	brotli -q 11	49342 bytes	-4052 bytes (-7.59%)
LZMA2 (Wikipedia)	xz	xz -9	50388 bytes	-3006 bytes (-5.63%)
Zstandard (Wikipedia)	zstd	zstd -19	51729 bytes	-1665 bytes (-3.12%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	52014 bytes	-1380 bytes (-2.58%)

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.