Dojo 1.3.0 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 312045 bytes (304.7k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 81429 bytes (79.5k, 26%).

After GZIP compression these minified files vary in size:

Boot	31846 bytes (31.1k)	CDN
Baidu	27719 bytes (27.1k)	CDN
cdnjs	27710 bytes (27.1k)	CDN
gzip -6 (default)	27611 bytes (27.0k)	local copy
gzip -9	27576 bytes (26.9k)	local copy
Sina	27568 bytes (26.9k)	CDN
7zip -mx=9 -tgzip	26434 bytes (25.8k)	local copy
kzip -s0 -rn -b6	26394 bytes (25.8k)	local copy
libdeflate -12	26387 bytes (25.8k)	local copy
zultra	26384 bytes (25.8k)	local copy
pigz -11 -n	26367 bytes (25.7k)	local copy
Zopfli	26260 bytes (25.6k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.3.0.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.3.0 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 1308 bytes by using my Dojo 1.3.0 Zopfli version instead of the best available CDN (4.98% smaller than Sina, 26260 vs. 27568 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 --mls64 --bsr11 --lazy --ohh

(found March 2, 2020)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	64	--mls64
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

Verify file integrity

After decompression, my uncompressed files are identical to the original ones:

MD5:
curl --silent --compressed https://download.dojotoolkit.org/release-1.3.0/dojo.js --location | md5sum
b9f0fe08c2d8b5f00c3047274c5a445f -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.3.0.min.zopfli.js.gz | md5sum
b9f0fe08c2d8b5f00c3047274c5a445f -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.3.0/dojo.js --location | sha1sum
a09b5851a0a3e9d81353745a4663741238ee1b84 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.3.0.min.zopfli.js.gz | sha1sum
a09b5851a0a3e9d81353745a4663741238ee1b84 -

These CDNs send you the original file:

CDN	Size (compressed)	MD5 (uncompressed)	Timestamp
Boot	31846 bytes	b9f0fe08c2d8b5f00c3047274c5a445f	March 19, 2015 @ 15:30
cdnjs	27710 bytes	b9f0fe08c2d8b5f00c3047274c5a445f	February 8, 2015 @ 14:45
Sina	27568 bytes	b9f0fe08c2d8b5f00c3047274c5a445f	April 25, 2019 @ 14:07

And some CDNs send you a different file:

CDN	Size (compressed)	MD5 (uncompressed)	Comment / Diff	Timestamp
Baidu	27719 bytes	64dff5a67096bc892af3170c4f60de4b	only whitespaces differ	January 7, 2015 @ 10:16

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
26260 bytes	-1 byte	zopfli --i1000000 --mls64 --bsr11 --lazy --ohh	March 2, 2020 @ 14:44
26261 bytes	-3 bytes	zopfli --i100000 --mls64 --bsr11 --lazy --ohh	December 1, 2015 @ 13:44
26264 bytes	-1 byte	zopfli --i10000 --mls64 --bsr11 --lazy --ohh	November 22, 2015 @ 22:23
26265 bytes	-3 bytes	zopfli --i10000 --mls128 --bsr25 --lazy --ohh	October 14, 2015 @ 11:54
26268 bytes	-2 bytes	zopfli --i1000 --mls128 --bsr13 --lazy --ohh	September 14, 2015 @ 22:36
26270 bytes	-2 bytes	zopfli --i1000 --mls64 --bsr16 --lazy --ohh	September 14, 2015 @ 22:30
26272 bytes	-1 byte	zopfli --i1000 --mls64 --bsr10 --lazy --ohh	September 14, 2015 @ 22:27
26273 bytes	-1 byte	zopfli --i1000 --mls512 --bsr8 --lazy --ohh	September 11, 2015 @ 02:51
26274 bytes	-1 byte	zopfli --i1000 --mls512 --bsr9 --lazy --ohh	September 11, 2015 @ 02:49
26275 bytes	-7 bytes	zopfli --i1000 --mls512 --bsr11 --lazy --ohh	September 11, 2015 @ 02:49
26282 bytes	–	zopfli --i100 --mls512 --bsr11 --lazy --ohh	September 10, 2015 @ 14:58

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 @ 09:24.

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	26342	26335	26346	26326	26334	26356	26353	26348	26359	26350	26351	26345	26353	26353	26353
4	26348	26315	26348	26297	26310	26329	26286	26285	26346	26342	26343	26348	26351	26348	26348
6	26291	26284	26330	26339	26286	26285	26311	26349	26349	26349	26351	26346	26351	26347	26346
7	26335	26280	26328	26276	26273	26312	26351	26351	26346	26344	26346	26349	26351	26347	26348
8	26334	26323	26278	26295	26270	26295	26275	26282	26270	26345	26349	26348	26351	26345	26351
9	26282	26285	26293	26307	26270	26269	26310	26278	26269	26352	26347	26348	26273	26348	26347
10	26280	26279	26293	26288	26270	26266	26343	26280	26353	26352	26343	26347	26358	26351	26347
11	26291	26277	26288	26301	26316	26260	26273	26270	26267	26342	26342	26344	26273	26346	26351
12	26279	26296	26297	26297	26265	26272	26271	26347	26341	26342	26341	26343	26345	26350	26345
13	26315	26283	26324	26289	26266	26266	26265	26342	26344	26344	26341	26341	26350	26345	26344
14	26297	26313	26340	26300	26266	26267	26271	26272	26343	26346	26342	26346	26345	26348	26348
15	26285	26277	26281	26302	26280	26268	26266	26271	26347	26342	26342	26349	26350	26348	26346
16	26284	26296	26319	26301	26267	26260	26271	26280	26279	26343	26345	26348	26285	26345	26350
17	26294	26278	26306	26304	26271	26268	26353	26271	26269	26342	26341	26348	26347	26345	26346
18	26310	26293	26303	26301	26279	26272	26311	26347	26343	26343	26346	26349	26347	26349	26344
19	26298	26289	26327	26291	26269	26271	26267	26347	26273	26345	26348	26347	26295	26349	26348
20	26326	26316	26278	26304	26270	26310	26274	26269	26346	26345	26347	26348	26355	26348	26346
21	26283	26277	26291	26319	26319	26274	26268	26351	26346	26343	26344	26345	26345	26348	26348
22	26290	26279	26301	26337	26312	26291	26349	26349	26351	26351	26349	26348	26272	26344	26347
23	26296	26318	26344	26306	26268	26271	26267	26269	26270	26341	26343	26345	26351	26345	26346
25	26293	26279	26313	26281	26306	26268	26265	26347	26349	26351	26341	26347	26350	26347	26347
30	26284	26288	26282	26300	26267	26270	26269	26285	26287	26345	26342	26344	26273	26348	26345
40	26281	26310	26283	26321	26266	26269	26266	26271	26275	26343	26342	26344	26350	26350	26347

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	26278 bytes	–	100%
1,000	26268 bytes	-10 bytes	100%
10,000	26264 bytes	-4 bytes	100%
100,000	26261 bytes	-3 bytes	0.58%
1,000,000	26260 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)	26396 bytes	+136 bytes (+0.52%)	+2 bytes
1	26396 bytes	+136 bytes (+0.52%)	+2 bytes
2	26415 bytes	+155 bytes (+0.59%)	+21 bytes
3	26397 bytes	+137 bytes (+0.52%)	+3 bytes
4	26434 bytes	+174 bytes (+0.66%)	+40 bytes
5	26413 bytes	+153 bytes (+0.58%)	+19 bytes
6	26394 bytes	+134 bytes (+0.51%)	–
7	26407 bytes	+147 bytes (+0.56%)	+13 bytes
8	26452 bytes	+192 bytes (+0.73%)	+58 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	21252 bytes	-5008 bytes (-19.07%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	23344 bytes	-2916 bytes (-11.10%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	24220 bytes	-2040 bytes (-7.77%)
Brotli (Wikipedia)	brotli	brotli -q 11	24430 bytes	-1830 bytes (-6.97%)
LZMA2 (Wikipedia)	xz	xz -9	25288 bytes	-972 bytes (-3.70%)
Zstandard (Wikipedia)	zstd	zstd -19	25891 bytes	-369 bytes (-1.41%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	26026 bytes	-234 bytes (-0.89%)

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.