Dojo 1.8.12 - as small as it gets (near-perfect GZIP compression)

Choose a version:

The original file has 611423 bytes (597.1k) and is available from the project website.
There you can find the official minified version, too, which brings down the size to 159534 bytes (155.8k, 26%).

After GZIP compression these minified files vary in size:

gzip -6 (default)	54035 bytes (52.8k)	local copy
gzip -9	53987 bytes (52.7k)	local copy
7zip -mx=9 -tgzip	51404 bytes (50.2k)	local copy
libdeflate -12	51353 bytes (50.1k)	local copy
kzip -s0 -rn -b1	51317 bytes (50.1k)	local copy
zultra	51316 bytes (50.1k)	local copy
pigz -11 -n	51315 bytes (50.1k)	local copy
Zopfli	51221 bytes (50.0k)	local copy
Zopfli (defluff)	51219 bytes (50.0k)	local copy

perma-link to the smallest file on my server:
http://minime.stephan-brumme.com/files/dojo/dojo-1.8.12.min.js (or via HTTPS)

You will automatically get the smallest Dojo 1.8.12 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 --bsr16 --lazy --ohh

(found March 16, 2022)

Description	Value	Parameter
iterations	1000000	--i1000000
maximum blocks	8	--mb8
maximum length score	8	--mls8
block splitting recursion	16	--bsr16
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 2 more bytes (51219 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-1.8.12/dojo.js --location | md5sum
676631e137350193ccb0ed899f931a1c -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.8.12.min.zopfli.js.gz | md5sum
676631e137350193ccb0ed899f931a1c -

SHA1:
curl --silent --compressed https://download.dojotoolkit.org/release-1.8.12/dojo.js --location | sha1sum
d70a5728ad9dbee0688117f23b3ed5d07ce361ce -
curl --silent --compressed https://minime.stephan-brumme.com/files/dojo/dojo-1.8.12.min.zopfli.js.gz | sha1sum
d70a5728ad9dbee0688117f23b3ed5d07ce361ce -

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
51221 bytes	-2 bytes	zopfli --i1000000 --mls8 --bsr16 --lazy --ohh	March 16, 2022 @ 13:54
51223 bytes	-5 bytes	zopfli --i100000 --mls2 --bsr11 --lazy --ohh	June 10, 2016 @ 14:35
51228 bytes	-1 byte	zopfli --i10000 --mls2 --bsr11 --lazy --ohh	June 10, 2016 @ 13:22
51229 bytes	-2 bytes	zopfli --i100000 --mls2 --bsr19 --lazy --ohh	June 10, 2016 @ 09:48
51231 bytes	-5 bytes	zopfli --i10000 --mls2 --bsr19 --lazy --ohh	June 10, 2016 @ 08:47
51236 bytes	-4 bytes	zopfli --i1000 --mls2 --bsr19 --lazy --ohh	June 10, 2016 @ 08:41
51240 bytes	–	zopfli --i100 --mls2 --bsr19 --lazy --ohh	June 9, 2016 @ 18:18

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 @ 03:20.

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	51234	51235	51235	51236	51234	51241	51236	51240	51246	51253	51255	51252	51257	51260	51266
4	51240	51232	51272	51247	51234	51236	51236	51237	51237	51249	51237	51245	51247	51246	51239
6	51237	51257	51237	51251	51237	51233	51232	51237	51237	51245	51237	51244	51244	51237	51243
7	51234	51268	51256	51239	51235	51237	51238	51248	51237	51233	51236	51247	51244	51241	51242
8	51275	51275	51248	51250	51238	51233	51233	51237	51238	51239	51238	51242	51240	51244	51244
9	51230	51238	51250	51244	51233	51234	51234	51233	51237	51246	51253	51249	51242	51242	51251
10	51239	51235	51237	51276	51235	51237	51234	51239	51237	51236	51237	51247	51243	51233	51250
11	51223	51232	51249	51254	51235	51236	51237	51236	51243	51246	51239	51243	51242	51248	51249
12	51231	51268	51270	51249	51233	51233	51236	51237	51237	51246	51239	51247	51244	51251	51264
13	51270	51230	51268	51238	51236	51237	51233	51236	51242	51241	51238	51244	51243	51243	51256
14	51270	51245	51272	51274	51235	51237	51231	51241	51237	51250	51240	51250	51243	51249	51236
15	51222	51232	51247	51249	51233	51237	51236	51242	51237	51248	51237	51246	51243	51235	51237
16	51236	51246	51221	51249	51237	51234	51233	51239	51237	51248	51236	51245	51243	51241	51237
17	51234	51230	51230	51271	51236	51237	51233	51237	51237	51251	51238	51243	51243	51235	51233
18	51223	51265	51232	51249	51235	51233	51233	51235	51236	51246	51238	51243	51244	51244	51250
19	51229	51274	51247	51266	51237	51237	51233	51237	51238	51241	51240	51243	51242	51235	51245
20	51232	51265	51231	51254	51236	51237	51233	51239	51238	51246	51242	51243	51243	51249	51237
21	51225	51231	51247	51248	51232	51233	51234	51239	51243	51246	51240	51243	51242	51249	51245
22	51237	51231	51272	51274	51235	51233	51238	51236	51237	51245	51244	51245	51243	51236	51249
23	51234	51235	51231	51275	51235	51236	51233	51239	51244	51248	51242	51243	51244	51250	51243
25	51226	51270	51269	51247	51236	51236	51234	51236	51250	51247	51241	51246	51244	51249	51243
30	51230	51232	51269	51246	51235	51234	51236	51237	51237	51245	51239	51243	51243	51237	51237
40	51232	51232	51230	51252	51236	51237	51238	51239	51237	51246	51240	51245	51241	51248	51246

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	51240 bytes	–	100%
1,000	51235 bytes	-5 bytes	100%
10,000	51228 bytes	-7 bytes	100%
100,000	51223 bytes	-5 bytes	2.03%
1,000,000	51221 bytes	-2 bytes	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)	51371 bytes	+150 bytes (+0.29%)	+54 bytes
1	51317 bytes	+96 bytes (+0.19%)	–
2	51351 bytes	+130 bytes (+0.25%)	+34 bytes
3	51379 bytes	+158 bytes (+0.31%)	+62 bytes
4	51373 bytes	+152 bytes (+0.30%)	+56 bytes
5	51432 bytes	+211 bytes (+0.41%)	+115 bytes
6	51432 bytes	+211 bytes (+0.41%)	+115 bytes
7	51452 bytes	+231 bytes (+0.45%)	+135 bytes
8	51466 bytes	+245 bytes (+0.48%)	+149 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	37737 bytes	-13484 bytes (-26.33%)
RAR (proprietary)	RAR	rar a -m5 -md64m -mc63:128t -mt1	44979 bytes	-6242 bytes (-12.19%)
PPMd (Wikipedia)	7zip	7za a -mx=9 -m0=ppmd	45848 bytes	-5373 bytes (-10.49%)
Brotli (Wikipedia)	brotli	brotli -q 11	47184 bytes	-4037 bytes (-7.88%)
LZMA2 (Wikipedia)	xz	xz -9	48244 bytes	-2977 bytes (-5.81%)
Zstandard (Wikipedia)	zstd	zstd -19	49781 bytes	-1440 bytes (-2.81%)
Burrows-Wheeler transform (Wikipedia)	bzip2	bzip2 -9	49968 bytes	-1253 bytes (-2.45%)

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.