Test Lossless Image Optimizers (PNG and JPG)

For many, it is no secret that most JPEG and PNG images contain redundant information that can be deleted without loss of quality. Usually this is achieved due to heuristic algorithms for searching various compression parameters and choosing the least cost option. The use of optimizers is especially important on files that are used on visited sites, to save disk space, traffic and reduce page load time for users. There are quite a few programs of this type and we set ourselves the goal of finding which optimizers compress better and work quickly.

The following programs took part in the test.

For PNG :
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1. Leanify 0.4.3 (x64)
2. pingo v0.79c
3. pinga v0.09
4. OptiPNG 0.7.6
5. pngout
6. PngOptimizer 2.5 (x64)
7. advpng aka AdvanceCOMP v1.23
8. ECT 0.6 (x64)
9. TruePNG 0.6.2.2
10. pngwolf-zopfli 1.1.1 (x64)

For JPEG :

1. Leanify 0.4.3 (x64)
2. pingo v0.79c
3. ECT 0.6 (x64)
4. mozjpeg 3.2 (x64)
5. jhead 3.00
6. jpegoptim v1.4.4 (x64)
7. jpegtran

100 PNG files and 100 JPG files were selected as test samples. Different sizes and resolutions from very small to huge. Each of the programs was launched on the whole set. The file size was considered after optimization and how long it took the program to optimize. Summary tables are shown below.

Table 1. Best PNG optimizers in terms of compression

	Maximum	88.49
1 place	Ect	88.98
2nd place	Leanify	89.62
3rd place	Pingo	89.69
4th place	pngwolf	91.34
5th place	pngout	91.85
6 place	TRUEPng	93.01
7th place	Optipng	94.19
8th place	pinga	94.8
9th place	PNGOptimizer	95.13
10 place	advpng	97.27

Table 2. The best optimizers PNG for speed

1 place	PNGOptimizer	00:04:08
2nd place	pinga	00:21:41
3rd place	Pingo	00:23:15
4th place	TruePNG	01:53:29
5th place	Leanify	01:57:00
6 place	pngout	02:53:09
7th place	pngwolf	02:55:26
8th place	Ect	03:06:08
9th place	advpng	03:25:34
10 place	Optipng	03:39:05

Table 3. Summary table for PNG optimizers

BY	Speed ​​rank	Compression rank	Overall rank	Open source
Pingo	3	3	6	-
Leanify	five	2	7	+
Ect	eight	one	9	+
PNGOptimizer	one	9	ten	+
TruePNG	four	6	ten	-
pinga	2	eight	ten	-
pngout	6	five	eleven	+
pngwolf	7	four	eleven	+
Optipng	ten	7	17	+
advpng	9	ten	nineteen	+

Table 4. The best optimizers JPG in terms of compression

1 place	Ect	89.996
1 place	pingo	89.996
1 place	leanify	89.997
1 place	mozjpeg	89.999
5th place	jpegoptim	90.880
6 place	jpegtran	90.924
7th place	jhead	99.592

Table 5. The best JPG optimizers for speed

1 place	jhead	00:00:25
2nd place	jpegtran	00:00:52
3rd place	jpegoptim	00:01:03
4th place	leanify	00:01:30
5th place	pingo	00:01:42
6 place	mozjpeg	00:01:55
7th place	Ect	00:02:52

Table 6. Summary table for JPG optimizers

Soft	Speed ​​rank	Compression rank	Overall rank	Open source
leanify	four	one	five	+
jpegoptim	3	2	five	+
jpegtran	2	3	five	+
jhead	one	four	five	+
pingo	five	one	6	-
mozjpeg	6	one	7	+
Ect	7	one	eight	+

Launch options

Testing was conducted on the platform of Windows 10 (x64), i7 - 4930K, 32gb RAM. All programs where there is a plus sign in the column Open Source will be collected on Linux. Only 3 programs do not work under Linux: Pingo, Pinga and TRUEpng.

PNG :

Leanify -i 15 -q Pingo -s4 pinga -lossless -more Optipng -o7 -strip all -quiet pngout /s0 /q /y /r /d0 /mincodes0 /k1 PngOptimizer -file advpng -z -q -4 -i 20 ECT --allfilters --mt-deflate -strip --strict -quiet -9 TruePNG /i0 /tz /quiet /y /md remove all /g0 /o4 pngwolf --strip-optional --out-deflate=zopfli,iter=30 --in= --out= 

JPEG :

 Leanify -i 15 -q Pingo -s4 ECT --mt-deflate -strip -progressive --allfilters --strict -quiet -9 mozjpegtran -outfile -progressive jhead -autorot -purejpg -di -dx -dt -zt -q jpegoptim --strip-all -o -q --all-progressive jpegtran -copy none -progressive 

For their internal purposes, they decided to use Leanify. And they made a small test site, if someone needs to optimize a small number of images online:

→ lossless-image-optimization.com

For local start, you can use FileOptimizer . It runs sequentially almost all of the above optimizers one by one on one file and as a result it works long enough, but it gives a result close to the maximum.

Links
→ Archive with test PNG files (100 pieces)
→ Archive with test JPG files (100 pieces)
→ Detailed table for all files on Google.Docs