Base64
Encode UTF-8 text or hexadecimal bytes as Base64, create unpadded URL-safe Base64 (Base64URL), or decode Base64 as UTF-8 text or hexadecimal bytes locally.
Open Base64Developer tool category
Encoding & Security Tools
Use this collection to inspect how text is represented, escaped for markup, encoded, tokenized, or hashed. Keep the distinction between transformation and verification clear: these utilities expose text, bytes, claims, encodings, and digests, but they do not turn decoded data or a hash into a security guarantee.
Common workflow
Where to start
4 recommended starting points
JWT
Decode JWT headers and payloads locally and inspect exp, nbf, and iat time status.
Open JWTURL Component
Encode or decode a URL path, query parameter value, or fragment component, handle form-style plus-sign spaces, remove common tracking parameters, clean and sort full URLs in one pass, normalize comparable URLs, or parse a full URL.
Open URL ComponentHash
Generate common digests from UTF-8 text or decoded Hex and Base64 bytes with browser-local processing.
Open HashRepresentative utilities
More tools to explore
3 additional tools
Hex Encoder & Decoder Online
Encode UTF-8 text as hexadecimal bytes or decode hexadecimal bytes back to UTF-8 text.
Number Base Converter Online – Decimal, Hex & Binary
Convert whole numbers between decimal, hexadecimal, binary, and octal without losing large integer precision.
HTML Entity Encoder & Decoder Online
Encode HTML-sensitive characters or decode common named and numeric character references locally.
Calculate
Calculators
1 resources
Base64 Size Calculator – Encoded Length & Overhead
Calculate exact padded Base64 length with 4 × ceil(bytes / 3), including padding characters and encoding overhead, locally in your browser.
Understand the concepts
Related guides
3 resources
Base64 vs Base64URL: What Changes?
Understand the Base64URL alphabet, padding rules, JWT usage, UTF-8 decoding, and how to convert safely between standard Base64 and URL-safe Base64.
Hashing Text vs Bytes & Encoding Pitfalls
Learn why hashes depend on exact bytes, how UTF-8 encodes text, and why BOMs, Unicode normalization, line endings, hex, and Base64 cause hash mismatches.
JWT Decode vs Verify – Why Decoding Is Not Verification
Learn the difference between decoding and verifying a JWT, what signature verification proves, and why issuer, audience, and time claims still need validation.