Base64 Encoding & Decoding
Convert between plain text and Base64 — essential for APIs, authentication, and data embedding.
How to Use
Common Uses
- API authentication — Basic Auth headers use Base64
- Data URIs — embed images in HTML/CSS
- JWT tokens — JWT payloads are Base64URL encoded
- Email attachments — MIME encoding uses Base64
FAQ
Is Base64 encryption?No — Base64 is encoding, not encryption. Anyone can decode it. Never use it to hide sensitive data.
Does it increase data size?Yes — Base64 increases size by ~33%. A 1MB file becomes ~1.33MB when Base64-encoded.
試す Base64エンコード/デコード
Base64のエンコード・デコード。
base64
encode
decode
developer
