JWT Decoder
Paste any JWT and instantly read its header and payload as pretty-printed JSON, plus the signature and token metadata. Decoding is pure base64url — no network calls, no secret needed. Local, private and useful for debugging auth flows.
Runs 100% in your browserNo signup neededFree forever
Paste a token like header.payload.signature and each segment is decoded from base64url. Standard claims (iat, exp, sub…) are surfaced in their own table with human-readable dates.
Paste a JWT
Frequently asked questions
Can this tool verify that my JWT is valid?
No — verification requires the secret or public key that signed the token. This tool only decodes the three segments so you can inspect their contents.
Is decoding considered a security risk?
JWT payloads are base64-encoded, not encrypted. Anyone can read them; treat them as public data. Never put secrets in a token you share.
More tools
JSON Formatter & ValidatorBeautify, minify, validate and explore JSON with a tree view.Base64 Encoder / DecoderEncode and decode Base64 text with full UTF-8 support.Hash GeneratorGenerate MD5, SHA-1, SHA-256 and SHA-512 hashes instantly.Text Diff CheckerCompare two texts side by side with live highlighting.Regex TesterLive pattern matching with highlighted matches and groups.UUID GeneratorBulk generate RFC 4122 UUIDs (v4 & v7) in one click.URL Encoder / DecoderEncode and decode URLs and query parameters cleanly.CSV ⇄ JSONConvert CSV tables to JSON and back, with live preview.Timestamp ConverterConvert Unix timestamps, ISO dates and human dates both ways.Hex ViewerInspect text bytes as an offset, hex, ASCII classic hexdump.Case ConverterConvert text between camelCase, snake_case, kebab-case and more.URL Slug GeneratorTurn any title or phrase into a clean, SEO-friendly URL slug.Lorem Ipsum GeneratorGenerate placeholder text: words, sentences or paragraphs.Password GeneratorGenerate strong random passwords with an entropy estimate.Text StatisticsCount words, characters, lines, sentences and reading time.HTML Entities Encoder / DecoderEncode or decode HTML entities (&, <, &) safely.Color Converter & Contrast CheckerConvert HEX, RGB, HSL and HSV with WCAG contrast ratios.CSS Unit ConverterConvert px ⇄ rem ⇄ em with a configurable root font size.HTML FormatterBeautify messy HTML with clear indentation and tags.CSS MinifierMinify CSS: strip comments, whitespace and shorten colors.YAML ⇄ JSONConvert between YAML and JSON with strict validation.SQL FormatterBeautify SQL with configurable indentation and keywords.CSV → SQL GeneratorTurn CSV data into CREATE TABLE and INSERT statements.HMAC GeneratorCompute HMAC-MD5, HMAC-SHA1, HMAC-SHA256, HMAC-SHA512.Cron Expression ParserExplain cron schedules like '*/5 * * * *' in plain English.IPv4 Subnet CalculatorCalculate networks, broadcast addresses and host counts for CIDR.