aspect ratio
The aspect ratio of an image is the ratio of its width to its height, and is expressed with two numbers separated by a colon, such as 16:9, sixteen-to-nine. For the x:y aspect ratio, the image is x units wide and y units high.
Common aspect ratios in e621
1:1
1:2
1:3
1:4
10:11
10:13
10:16
10:7
10:9
100:99
11:10
11:12
11:13
11:14
11:15
11:16
11:17
11:6
11:8
11:9
12:11
12:17
12:19
12:25
13:10
13:12
13:14
13:15
13:16
13:17
13:18
13:19
13:20
13:6
135:256
14:15
14:17
14:19
14:9
15:13
15:14
15:16
15:17
15:19
15:22
16:10
16:11
16:13
16:15
16:17
16:19
16:21
16:9
17:11
17:12
17:19
17:20
17:22
17:9
18:17
18:25
18:37
18:39
19:11
19:14
19:18
19:20
19:21
19:25
2:1
2:3
2:5
20:17
20:19
20:21
20:27
20:29
21:17
21:32
21:9
22:15
22:17
22:25
23:26
23:30
24:23
24:37
25:16
25:18
25:32
256:135
26:27
27:22
28:39
29:18
29:25
29:48
3:1
3:2
3:4
3:5
3:7
31:37
32:25
32:33
32:41
32:9
33:50
35:12
35:18
35:41
37:18
37:36
39:18
4:1
4:3
4:5
4:7
40:19
43:48
5:3
5:33
5:4
5:6
5:7
5:9
50:59
6:13
6:5
6:7
60:47
64:35
7:10
7:4
7:5
7:6
7:8
7:9
8:11
8:7
8:9
9:10
9:11
9:13
9:14
9:16
9:17
9:5
9:7
9:8
99:98
See also: tag_group:aspect_ratios, for the full list.