Dojo 1.7.8 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 565450 bytes (552.2k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 140742 bytes (137.4k, 25%).

After GZIP compression these minified files vary in size:

Boot	56188 bytes (54.9k)	CDN
cdnjs	48829 bytes (47.7k)	CDN
gzip -6 (default)	48653 bytes (47.5k)	local copy
gzip -9	48608 bytes (47.5k)	local copy
7zip -mx=9 -tgzip	46404 bytes (45.3k)	local copy
libdeflate -12	46349 bytes (45.3k)	local copy
zultra	46325 bytes (45.2k)	local copy
kzip -s0 -rn -b1	46324 bytes (45.2k)	local copy
pigz -11 -n	46315 bytes (45.2k)	local copy
Zopfli	46229 bytes (45.1k)	local copy
Zopfli (defluff)	46228 bytes (45.1k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.7.8.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.7.8 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

Save 2600 bytes by using my Dojo 1.7.8 Zopfli version instead of the best available CDN (5.62% smaller than cdnjs, 46229 vs. 48829 bytes):

Download

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 --mls4 --bsr21 --lazy --ohh

(found February 25, 2020)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	4	--mls4
block splitting recursion	21	--bsr21
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 (46228 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-1.7.8/dojo.js --location | md5sum
5365fd0872640122c9e7de72b7ace695 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.7.8.min.zopfli.js.gz | md5sum
5365fd0872640122c9e7de72b7ace695 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.7.8/dojo.js --location | sha1sum
6cf76e0793f00259f9111c8a20ec558be251572d -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.7.8.min.zopfli.js.gz | sha1sum
6cf76e0793f00259f9111c8a20ec558be251572d -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	56188 bytes	5365fd0872640122c9e7de72b7ace695	March 19, 2015 @ 15:36
cdnjs	48829 bytes	5365fd0872640122c9e7de72b7ace695	February 8, 2015 @ 14:45

Note: only the MD5 hashes are shown to keep things simple.

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
46229 bytes	-1 byte	zopfli --i1000000 --mls4 --bsr21 --lazy --ohh	February 25, 2020 @ 23:08
46230 bytes	-1 byte	zopfli --i100000 --mls4 --bsr21 --lazy --ohh	December 2, 2015 @ 22:56
46231 bytes	-2 bytes	zopfli --i100000 --mls16384 --bsr40 --lazy --ohh	December 2, 2015 @ 18:13
46233 bytes	-1 byte	zopfli --i10000 --mls16384 --bsr13 --lazy --ohh	December 2, 2015 @ 17:11
46234 bytes	-3 bytes	zopfli --i10000 --mls16384 --bsr16 --lazy --ohh	October 14, 2015 @ 00:07
46237 bytes	-1 byte	zopfli --i1000 --mls16384 --bsr16 --lazy --ohh	September 12, 2015 @ 19:20
46238 bytes	-1 byte	zopfli --i1000 --mls16384 --bsr12 --lazy --ohh	September 12, 2015 @ 19:11
46239 bytes	-1 byte	zopfli --i1000 --mls256 --bsr10 --lazy --ohh	September 12, 2015 @ 19:01
46240 bytes	-2 bytes	zopfli --i1000 --mls512 --bsr16 --lazy --ohh	September 10, 2015 @ 21:25
46242 bytes	-4 bytes	zopfli --i1000 --mls512 --bsr11 --lazy --ohh	September 10, 2015 @ 21:16
46246 bytes	-1 byte	zopfli --i1000 --mls512 --bsr2 --lazy --ohh	September 10, 2015 @ 21:15
46247 bytes	–	zopfli --i100 --mls512 --bsr11 --lazy --ohh	September 10, 2015 @ 14:55

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

Most recent activity on March 16, 2022 @ 12:58.

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	46251	46253	46254	46249	46247	46247	46246	46246	46241	46276	46242	46265	46265	46275	46248
4	46242	46238	46243	46238	46243	46246	46249	46243	46244	46272	46262	46253	46253	46260	46243
6	46244	46236	46245	46242	46243	46246	46257	46247	46247	46253	46251	46253	46250	46251	46231
7	46241	46239	46241	46242	46237	46249	46251	46237	46246	46252	46259	46253	46264	46252	46246
8	46242	46240	46243	46242	46244	46247	46251	46242	46242	46262	46260	46261	46265	46240	46243
9	46242	46240	46237	46237	46237	46251	46249	46242	46246	46246	46250	46256	46259	46251	46241
10	46241	46238	46242	46238	46237	46251	46250	46237	46242	46251	46258	46253	46267	46236	46242
11	46240	46243	46245	46242	46242	46253	46241	46242	46241	46250	46250	46253	46253	46235	46248
12	46243	46238	46239	46242	46239	46246	46250	46238	46251	46248	46253	46260	46254	46235	46231
13	46241	46244	46242	46237	46236	46248	46240	46242	46252	46253	46253	46250	46266	46230	46248
14	46240	46240	46240	46244	46237	46252	46246	46251	46251	46249	46254	46252	46256	46243	46243
15	46242	46242	46238	46242	46243	46251	46250	46245	46245	46254	46253	46259	46252	46252	46248
16	46242	46240	46240	46242	46237	46251	46254	46242	46239	46250	46250	46249	46268	46231	46246
17	46240	46240	46241	46242	46240	46251	46250	46242	46247	46248	46255	46262	46252	46231	46243
18	46241	46245	46238	46242	46237	46249	46257	46239	46244	46250	46250	46250	46256	46250	46246
19	46243	46238	46241	46238	46231	46248	46242	46237	46246	46248	46254	46250	46256	46252	46243
20	46240	46239	46241	46241	46240	46251	46254	46242	46247	46250	46247	46251	46258	46242	46240
21	46241	46229	46243	46242	46237	46258	46253	46237	46247	46248	46247	46249	46257	46243	46244
22	46241	46234	46242	46242	46238	46249	46251	46243	46246	46248	46257	46249	46246	46235	46251
23	46241	46240	46242	46242	46245	46257	46255	46242	46241	46247	46255	46253	46267	46253	46240
25	46240	46241	46242	46239	46237	46248	46254	46240	46244	46247	46258	46257	46252	46258	46236
30	46240	46242	46240	46242	46239	46247	46246	46242	46242	46249	46253	46257	46263	46234	46239
40	46240	46240	46240	46239	46231	46254	46258	46242	46253	46255	46254	46259	46267	46231	46244

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	46242 bytes	–	100%
1,000	46237 bytes	-5 bytes	100%
10,000	46233 bytes	-4 bytes	100%
100,000	46230 bytes	-3 bytes	2.61%
1,000,000	46229 bytes	-1 byte	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)	46353 bytes	+124 bytes (+0.27%)	+29 bytes
1	46324 bytes	+95 bytes (+0.21%)	–
2	46349 bytes	+120 bytes (+0.26%)	+25 bytes
3	46389 bytes	+160 bytes (+0.35%)	+65 bytes
4	46413 bytes	+184 bytes (+0.40%)	+89 bytes
5	46400 bytes	+171 bytes (+0.37%)	+76 bytes
6	46424 bytes	+195 bytes (+0.42%)	+100 bytes
7	46469 bytes	+240 bytes (+0.52%)	+145 bytes
8	46484 bytes	+255 bytes (+0.55%)	+160 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	34494 bytes	-11735 bytes (-25.38%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	40479 bytes	-5750 bytes (-12.44%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	41372 bytes	-4857 bytes (-10.51%)
Brotli (Wikipedia)	brotli	brotli -q 11	42498 bytes	-3731 bytes (-8.07%)
LZMA2 (Wikipedia)	xz	xz -9	43552 bytes	-2677 bytes (-5.79%)
Zstandard (Wikipedia)	zstd	zstd -19	44859 bytes	-1370 bytes (-2.96%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	44876 bytes	-1353 bytes (-2.93%)

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.