ValidateThis

UTF-8 text validator

Related tools

Validators and utilities that complement UTF-8 text validator — same session, no sign-up.

  • UTF-8 round-trip: OK
  • Code points (approx): 13
  • UTF-8 byte length: 15

Encode text as UTF-8 bytes and decode with fatal errors — detects invalid surrogate pairs for storage in JS strings.

JavaScript strings are UTF-16; this checks round-trip through UTF-8 bytes. For binary files, use a hex or base64 workflow.

How to use this tool

  1. Paste your sample in the input (or fetch from URL if this tool supports it).
  2. Run the main action on the page to execute UTF-8 text validator.
  3. Read the result, fix the source data or config, and re-run if needed.

What this check helps you catch

  • Encode text as UTF-8 bytes and decode with fatal errors — detects invalid surrogate pairs for storage in JS strings.
  • Limits called out in the description (what this tool does not verify — e.g. live network reachability, issuer databases, or strict schema contracts unless stated).
  • Structural or syntax mistakes that would break parsers, serializers, or the next step in your workflow.

FAQ

What does UTF-8 text validator do?
Encode text as UTF-8 bytes and decode with fatal errors — detects invalid surrogate pairs for storage in JS strings. Use the form above, then see “How to use” and “What this check helps you catch” for behavior detail.
Is this a substitute for server-side validation?
No. Use it for manual checks and triage; production systems should still validate and authorize on the server.
Where does processing happen?
Most validators here run in your browser. If a tool calls an API, that is stated on the page. See the site privacy policy for data handling.