No — the main site works with no sign-in. Accounts are only needed for the developer API.
5MB per file. Zips are unpacked and each file inside gets the same 5MB check.
Permanently, unless deleted with the delete link shown right after upload. There's no automatic expiry.
Yes, but only using the delete link/button shown at upload time. It isn't saved or shown again after you leave that page — if you lose it, the file can't be removed through the site.
You get the existing link back instantly — nothing new is stored. This works across different users too, not just your own repeat uploads.
Only images, video, audio, and PDF preview inline. Everything else (zips, executables, etc.) triggers a direct download since browsers can't render them.
Yes — that's the intended use case for the raw /f/<hash> links.
No. Anyone with the link can view or download the file. Don't upload anything you don't want to be publicly accessible.
See the Terms — illegal content, malware, and anything violating others' rights is prohibited and subject to removal.