OneCompiler
onecompiler.com
Compiles and runs code in around seventy languages with no sign-up
pastebin.com
Drops a block of text or code at a short URL you can send to anyone.
The original paste host, still doing exactly one job: paste, pick syntax highlighting and an expiry, get a link. Guest pastes need no account, and choosing a ten-minute or one-day expiry is the difference between a helpful snippet and a permanent leak. Public pastes are scraped continuously by people looking for credentials, so anything containing a key or a hostname should be unlisted at minimum.
Questions
Works the moment the page loads. No account, no email, no trial. Public pastes are scraped within minutes, and a guest paste cannot be edited or deleted afterwards.
Yes. Pastebin sends your input to its own servers to process it. That is fine for public material; for anything containing personal data, use one of the on-device tools instead.
Public pastes are scraped within minutes, and a guest paste cannot be edited or deleted afterwards.
Alternatives
Same category or same task, ordered by how closely they overlap.
onecompiler.com
Compiles and runs code in around seventy languages with no sign-up
bundlephobia.com
Shows what an npm package costs your bundle before you install it
caniuse.com
Answers whether a browser feature is safe to ship yet
crontab.guru
Translates a cron expression into a plain English schedule as you type
gchq.github.io
Chains encoding, hashing and decryption steps into a repeatable recipe
devdocs.io
One fast search box across a hundred API references, usable offline