When you go to https://tools.wmflabs.org/croptool/ you get redirected to mediawiki.org. Click allow and you get:

Internal error

The URI you have requested, http://tools.wmflabs.org/?500, appears to be non-functional at this time.

Perhaps the webserver has temporarily lost its mind, or the link you've followed doesn't actually lead somewhere useful?

If you're pretty sure this shouldn't be an error, you may wish to notify the project administrators about the error and how you ended up here.
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Severity: normal