Format, minify and validate JSON with error line/column, duplicate-key detection and exact large numbers
Base64 Encoder & Decoder
Encode text to Base64 or decode it, with base64url, padding removal and 76-character MIME lines, safely handling Arabic and emoji through UTF-8.
Workspace
Result
How the result is calculated
Text is converted to UTF-8 bytes with TextEncoder, then every 3 bytes become 4 symbols from the RFC 4648 alphabet with = padding. base64url replaces +/ with -_. Decoding ignores whitespace, accepts both alphabets and rejects anything invalid (foreign symbols, impossible length, padding in the middle). If the bytes are not valid UTF-8 they are shown as hex.
Limits:
Base64 is encoding, not encryption: it does not hide data. The tool handles text only (no files or images). Very large input may slow the browser.
FAQ
Is Base64 safe for secrets?
No, anyone can decode it instantly; use real encryption.
What is the difference between base64 and base64url?
The latter replaces + and / with - and _ so it is safe in URLs and JWT.
