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File type:

• flash (.swf)
• animated_png (apng; .png)

Resolution:

• thumbnail (≤ 250×250)
• low_res (≤ 500×500)
• hi_res (≥ 1600 wide or ≥ 1200 tall)
• absurd_res (≥ 3200 wide or ≥ 2400 tall)
• superabsurd_res (≥ 10000 either width and/or height)

Number of tags:

• tagme (sometimes used for low tag counts; note that this tag does not count toward a post's tag count)
• tag_panic (at least 150 tags)

Aspect ratio:

The ratio metatag can also be used, though this may produce more results than expected.
ratio:1:1 ratio:1
ratio:2:1 ratio:2
See tag group:aspect ratios for a list.

See also:

• e621:image_quality