Curveybooru

Update: Tag history has been overhauled. You can now clearly see what tags have been +added and -removed from a post within the tag history as well as the category for each tag and the rating history.
To view the tag history of a post click on it and look for the history section within the sidebar.

« Help: Cheat Sheet

Searching

tag1 tag_2
Search for posts that have tag1 and tag_2.
-tag1
Search for posts that don't have tag1.
night~
Fuzzy search for the tag night. This will return results such as night fight bright and so on according to the Levenshtein distance.
ta*1
Search for posts with tags that starts with ta and ends with 1.
user:bob
Search for posts uploaded by the user Bob.
md5:foo
Search for posts with the MD5 hash foo.
md5:foo*
Search for posts whose MD5 starts with the MD5 hash foo.
rating:questionable
Search for posts that are rated questionable.
-rating:questionable
Search for posts that are not rated questionable.
parent:1234
Search for posts that have 1234 as a parent (and include post 1234).
rating:questionable rating:safe
In general, combining the same metatags (the ones that have colons in them) will not work.
rating:questionable parent:100
You can combine different metatags, however.
width:>1000 height:>1000
Find images with a width greater than or equal to 1000 and a height greater than 1000.
score:>5
Find images with a score greater than or equal to 10. This value is updated once daily at 12AM CST.
title:chubby or desc:chubby or description:chubby
Finds posts with a title/description with the included phrase.
source:pixiv.net or source:twitter
Search for posts that contain certain websites or words in there source section.