Input Validation Playground
Check sample emails, URLs, identifiers, dates, and numbers against visible validation rules.
Does a valid email or URL mean it exists?
No. These checks validate syntax only. Choose a rule and enter one value per line to see which inputs satisfy that rule; the tool makes no network requests.
Your result
A little clarity, right here.
Start with your own content or load the example. Your result will appear here.
Three simple steps
How to use Input Validation Playground
Choose your input and adjust the options.
Review the preview and run the tool.
Download the result and keep your original.
Common questions
Good to know
Understand the result.
Keep the original.
Is this tool free, and are my files uploaded?
This tool is free with no account required. The work happens in your browser. Your input and files are not sent to a processing server.
What are the limits and details?
Syntax validation cannot verify ownership, deliverability, identity, or safety. URL validation accepts HTTP and HTTPS URLs with a protocol; date checks use strict ISO 8601 syntax.
Limits: 500,000 characters per text field; files up to 20 MB each, 10 files and 50 MB total. Processing stops after 30 seconds.