📡Validators
RSS / Atom Feed Validator
Validate RSS 2.0 and Atom 1.0 by pasting XML — checks required elements, RFC dates, unique GUID/id and links W3C-style errors.
Related Tools
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CPF Validator
Validate Brazilian CPF numbers instantly using the official algorithm. Useful for testing document validation in applications. No data sent to servers.
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Batch CPF Validator
Validate a list of CPFs (one per line) and see which are valid and which are not. No data sent to servers.
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Batch CNPJ Validator
Validate a list of CNPJs (one per line) with a summary of valid, invalid and total. No data sent to servers.