Decode JWT headers and payloads locally — no data leaves your browser.
Paste any JWT to instantly decode its header and payload into readable JSON with an expiry/validity check. Safe for inspecting real tokens because decoding happens locally.
100% client-side — zero uploads, maximum privacy
Instant results — no waiting for server processing
Secure — your data never leaves your browser
Free to use — no sign-up required
Handles real-world edge cases — malformed input, nested structures, large payloads
Syntax highlighting for easier reading and debugging
Copy-to-clipboard in one click — paste directly into your editor or terminal
Works with JSON, YAML, XML, CSV, Base64, JWT, and more
No file size limits for text processing
Inspect JWT token claims during authentication debugging
Verify token expiration and audience claims
Debug OAuth2 and SSO token exchange flows
Read encoded user data from access tokens
Validate JWT structure before sending in API requests
No. Decoding is 100% local — the token never leaves your browser.
No. It only decodes header and payload. Signature verification requires the secret, which the tool deliberately never asks for.
Format, minify and validate JSON with syntax error details and document stats.
Convert CSV to JSON and JSON to CSV with delimiter and quote support.
Test regular expressions with live match highlighting, groups and flags.
Encode text or files to Base64 with URL-safe and Unicode support.
Decode Base64 strings back to text or files with Unicode support.
Percent-encode URL strings for query parameters and paths.