Dojo 1.7.7 - 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	56186 bytes (54.9k)	CDN
cdnjs	48828 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	46394 bytes (45.3k)	local copy
libdeflate -12	46348 bytes (45.3k)	local copy
zultra	46323 bytes (45.2k)	local copy
kzip -s0 -rn -b1	46319 bytes (45.2k)	local copy
pigz -11 -n	46312 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-1.7.7.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.7.7 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 2599 bytes by using my Dojo 1.7.7 Zopfli version instead of the best available CDN (5.62% smaller than cdnjs, 46229 vs. 48828 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 --mls16384 --bsr40 --lazy --ohh

(found March 16, 2022)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	16384	--mls16384
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 (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-1.7.7/dojo.js --location | md5sum
c61a4912ff79a5f783724d1c885dd26d -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.7.7.min.zopfli.js.gz | md5sum
c61a4912ff79a5f783724d1c885dd26d -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.7.7/dojo.js --location | sha1sum
9a30e44150fe54a6c53c21013303a044bef16c7d -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.7.7.min.zopfli.js.gz | sha1sum
9a30e44150fe54a6c53c21013303a044bef16c7d -

All listed CDNs deliver identical contents:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	56186 bytes	c61a4912ff79a5f783724d1c885dd26d	March 19, 2015 @ 15:36
cdnjs	48828 bytes	c61a4912ff79a5f783724d1c885dd26d	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 --mls16384 --bsr40 --lazy --ohh	March 16, 2022 @ 20:57
46230 bytes	-1 byte	zopfli --i100000 --mls32768 --bsr12 --lazy --ohh	December 2, 2015 @ 18:35
46231 bytes	-2 bytes	zopfli --i100000 --mls16384 --bsr10 --lazy --ohh	December 2, 2015 @ 17:38
46233 bytes	-2 bytes	zopfli --i10000 --mls16384 --bsr10 --lazy --ohh	November 23, 2015 @ 00:12
46235 bytes	-1 byte	zopfli --i10000 --mls16384 --bsr12 --lazy --ohh	November 22, 2015 @ 22:50
46236 bytes	-1 byte	zopfli --i10000 --mls32 --bsr19 --lazy --ohh	October 14, 2015 @ 05:50
46237 bytes	-1 byte	zopfli --i1000 --mls16384 --bsr16 --lazy --ohh	September 12, 2015 @ 19:36
46238 bytes	-2 bytes	zopfli --i1000 --mls256 --bsr10 --lazy --ohh	September 12, 2015 @ 19:36
46240 bytes	-2 bytes	zopfli --i1000 --mls512 --bsr16 --lazy --ohh	September 10, 2015 @ 21:29
46242 bytes	-1 byte	zopfli --i1000 --mls512 --bsr11 --lazy --ohh	September 10, 2015 @ 21:29
46243 bytes	-2 bytes	zopfli --i1000 --mls512 --bsr8 --lazy --ohh	September 10, 2015 @ 21:25
46245 bytes	-1 byte	zopfli --i1000 --mls512 --bsr4 --lazy --ohh	September 10, 2015 @ 21:25
46246 bytes	–	zopfli --i100 --mls512 --bsr11 --lazy --ohh	September 10, 2015 @ 15:08

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

Most recent activity on March 17, 2022 @ 02:03.

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	46250	46253	46253	46248	46247	46246	46246	46245	46244	46276	46240	46265	46265	46270	46248
4	46241	46237	46242	46237	46242	46245	46249	46242	46243	46263	46262	46252	46254	46258	46241
6	46243	46236	46245	46241	46243	46246	46255	46247	46246	46253	46251	46252	46249	46251	46229
7	46241	46238	46240	46241	46236	46250	46252	46236	46246	46251	46258	46253	46263	46251	46244
8	46241	46239	46242	46241	46243	46250	46254	46241	46241	46262	46260	46261	46265	46241	46247
9	46241	46239	46236	46236	46237	46251	46249	46241	46246	46247	46249	46256	46258	46250	46240
10	46240	46237	46241	46237	46237	46253	46250	46236	46241	46249	46257	46251	46266	46231	46239
11	46239	46243	46244	46243	46241	46250	46241	46241	46241	46249	46249	46253	46253	46231	46247
12	46242	46238	46239	46241	46239	46245	46252	46237	46250	46247	46252	46260	46253	46230	46230
13	46241	46244	46242	46236	46235	46249	46239	46241	46252	46253	46253	46249	46265	46236	46248
14	46239	46240	46239	46243	46236	46250	46245	46250	46251	46249	46254	46252	46256	46240	46243
15	46241	46242	46237	46241	46243	46250	46248	46244	46245	46250	46252	46259	46251	46252	46247
16	46241	46239	46239	46241	46236	46248	46251	46241	46238	46249	46249	46249	46266	46231	46246
17	46239	46239	46240	46241	46239	46248	46251	46242	46247	46247	46253	46261	46251	46231	46242
18	46240	46243	46237	46241	46236	46249	46253	46239	46244	46249	46249	46250	46256	46250	46245
19	46242	46237	46240	46237	46236	46250	46241	46236	46246	46249	46257	46250	46256	46251	46243
20	46239	46239	46240	46237	46239	46253	46251	46241	46247	46250	46248	46250	46258	46242	46239
21	46240	46236	46242	46241	46236	46257	46253	46236	46247	46248	46249	46246	46257	46241	46243
22	46241	46236	46241	46242	46237	46251	46251	46243	46246	46248	46256	46246	46241	46236	46248
23	46240	46239	46241	46237	46245	46258	46256	46241	46241	46249	46254	46253	46266	46252	46240
25	46239	46241	46241	46242	46237	46250	46252	46239	46243	46249	46257	46256	46250	46241	46244
30	46239	46241	46239	46241	46238	46249	46249	46241	46241	46249	46252	46255	46262	46235	46236
40	46239	46239	46239	46239	46236	46252	46255	46241	46252	46255	46252	46259	46265	46229	46243

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	46243 bytes	–	100%
1,000	46237 bytes	-6 bytes	100%
10,000	46233 bytes	-4 bytes	100%
100,000	46230 bytes	-3 bytes	2.32%
1,000,000	46229 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)	46352 bytes	+123 bytes (+0.27%)	+33 bytes
1	46319 bytes	+90 bytes (+0.19%)	–
2	46349 bytes	+120 bytes (+0.26%)	+30 bytes
3	46387 bytes	+158 bytes (+0.34%)	+68 bytes
4	46411 bytes	+182 bytes (+0.39%)	+92 bytes
5	46403 bytes	+174 bytes (+0.38%)	+84 bytes
6	46431 bytes	+202 bytes (+0.44%)	+112 bytes
7	46462 bytes	+233 bytes (+0.50%)	+143 bytes
8	46483 bytes	+254 bytes (+0.55%)	+164 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	34493 bytes	-11736 bytes (-25.39%)
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	41373 bytes	-4856 bytes (-10.50%)
Brotli (Wikipedia)	brotli	brotli -q 11	42492 bytes	-3737 bytes (-8.08%)
LZMA2 (Wikipedia)	xz	xz -9	43544 bytes	-2685 bytes (-5.81%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	44837 bytes	-1392 bytes (-3.01%)
Zstandard (Wikipedia)	zstd	zstd -19	44858 bytes	-1371 bytes (-2.97%)

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.