Dojo 1.14.8 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 639159 bytes (624.2k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 167874 bytes (163.9k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	56397 bytes (55.1k)	local copy
gzip -9	56327 bytes (55.0k)	local copy
libdeflate -12	53639 bytes (52.4k)	local copy
7zip -mx=9 -tgzip	53627 bytes (52.4k)	local copy
kzip -s0 -rn -b1	53549 bytes (52.3k)	local copy
zultra	53547 bytes (52.3k)	local copy
pigz -11 -n	53540 bytes (52.3k)	local copy
Zopfli	53465 bytes (52.2k)	local copy
Zopfli (defluff)	53464 bytes (52.2k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.14.8.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.14.8 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

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 --bsr2 --lazy --ohh

(found March 23, 2021)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	256	--mls256
block splitting recursion	2	--bsr2
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 (53464 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-1.14.8/dojo.js --location | md5sum
2eb4361b62c6027eb158beacc8c436e1 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.14.8.min.zopfli.js.gz | md5sum
2eb4361b62c6027eb158beacc8c436e1 -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.14.8/dojo.js --location | sha1sum
7e9a5c42bccb18e3e96d9dbe2f697b87e501db37 -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.14.8.min.zopfli.js.gz | sha1sum
7e9a5c42bccb18e3e96d9dbe2f697b87e501db37 -

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
53465 bytes	-1 byte	zopfli --i1000000 --mls256 --bsr2 --lazy --ohh	March 23, 2021 @ 21:28
53466 bytes	-1 byte	zopfli --i100000 --mls256 --bsr2 --lazy --ohh	March 23, 2021 @ 12:41
53467 bytes	-2 bytes	zopfli --i10000 --mls256 --bsr2 --lazy --ohh	March 22, 2021 @ 19:14
53469 bytes	-1 byte	zopfli --i10000 --mls2 --bsr10 --lazy --ohh	March 22, 2021 @ 19:09
53470 bytes	-7 bytes	zopfli --i10000 --mls4096 --bsr10 --lazy --ohh	March 22, 2021 @ 17:03
53477 bytes	-1 byte	zopfli --i1000 --mls2 --bsr23 --lazy --ohh	March 22, 2021 @ 16:55
53478 bytes	-1 byte	zopfli --i1000 --mls2 --bsr10 --lazy --ohh	March 22, 2021 @ 15:45
53479 bytes	-2 bytes	zopfli --i1000 --mls32 --bsr16 --lazy --ohh	March 22, 2021 @ 15:36
53481 bytes	–	zopfli --i100 --mls16 --bsr30 --lazy --ohh	March 22, 2021 @ 15:21

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 @ 15:18.

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	53504	53504	53471	53476	53475	53471	53473	53465	53489	53492	53484	53478	53479	53495	53492
4	53508	53500	53475	53475	53477	53477	53475	53474	53480	53476	53478	53480	53479	53488	53482
6	53498	53503	53500	53473	53481	53479	53472	53483	53479	53479	53489	53493	53480	53486	53484
7	53508	53507	53507	53503	53483	53476	53479	53475	53478	53479	53481	53477	53482	53473	53480
8	53501	53496	53498	53504	53473	53478	53473	53474	53491	53489	53493	53488	53488	53485	53485
9	53497	53507	53481	53475	53476	53482	53474	53471	53478	53479	53494	53492	53482	53479	53482
10	53467	53499	53476	53503	53481	53471	53476	53474	53479	53480	53485	53470	53476	53488	53483
11	53487	53486	53477	53474	53473	53479	53474	53474	53478	53479	53485	53493	53480	53485	53482
12	53503	53496	53498	53480	53473	53472	53471	53475	53479	53479	53488	53492	53481	53479	53483
13	53500	53495	53475	53513	53476	53478	53471	53474	53479	53495	53485	53492	53475	53482	53478
14	53490	53487	53502	53503	53476	53477	53471	53474	53480	53480	53482	53484	53481	53485	53481
15	53500	53495	53472	53477	53475	53481	53471	53474	53480	53480	53485	53478	53480	53490	53489
16	53506	53498	53498	53506	53478	53481	53471	53480	53481	53476	53481	53492	53482	53479	53481
17	53496	53498	53510	53514	53476	53478	53472	53473	53479	53479	53480	53497	53482	53480	53485
18	53495	53506	53476	53504	53475	53482	53471	53479	53479	53479	53484	53492	53480	53486	53497
19	53486	53507	53477	53475	53476	53478	53472	53471	53480	53479	53488	53492	53481	53487	53482
20	53507	53504	53500	53477	53480	53487	53471	53479	53479	53479	53493	53493	53482	53484	53486
21	53500	53494	53502	53475	53479	53475	53471	53475	53479	53479	53487	53483	53481	53479	53487
22	53495	53506	53501	53476	53477	53478	53471	53474	53480	53478	53481	53492	53482	53474	53482
23	53470	53490	53501	53477	53475	53478	53473	53480	53479	53494	53490	53492	53477	53479	53488
25	53503	53497	53476	53474	53475	53476	53472	53480	53482	53485	53485	53482	53483	53485	53486
30	53494	53496	53504	53476	53479	53481	53471	53479	53478	53479	53494	53492	53480	53491	53488
40	53503	53495	53498	53476	53473	53478	53471	53480	53479	53479	53480	53494	53482	53480	53483

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	53481 bytes	–	100%
1,000	53477 bytes	-4 bytes	100%
10,000	53467 bytes	-10 bytes	100%
100,000	53466 bytes	-1 byte	0.58%
1,000,000	53465 bytes	-1 byte	0.29%
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)	53639 bytes	+174 bytes (+0.33%)	+90 bytes
1	53549 bytes	+84 bytes (+0.16%)	–
2	53582 bytes	+117 bytes (+0.22%)	+33 bytes
3	53601 bytes	+136 bytes (+0.25%)	+52 bytes
4	53633 bytes	+168 bytes (+0.31%)	+84 bytes
5	53662 bytes	+197 bytes (+0.37%)	+113 bytes
6	53682 bytes	+217 bytes (+0.41%)	+133 bytes
7	53698 bytes	+233 bytes (+0.44%)	+149 bytes
8	53702 bytes	+237 bytes (+0.44%)	+153 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	39262 bytes	-14203 bytes (-26.57%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	46917 bytes	-6548 bytes (-12.25%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	47841 bytes	-5624 bytes (-10.52%)
Brotli (Wikipedia)	brotli	brotli -q 11	49408 bytes	-4057 bytes (-7.59%)
LZMA2 (Wikipedia)	xz	xz -9	50448 bytes	-3017 bytes (-5.64%)
Zstandard (Wikipedia)	zstd	zstd -19	51784 bytes	-1681 bytes (-3.14%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	51996 bytes	-1469 bytes (-2.75%)

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.