Base64 Encode / Decode
Two-way Base64 conversion that respects UTF-8.
All processing happens locally in your browser
Mode · encode
Base64 encoding converts binary data or text into a string of 64 printable ASCII characters, making it safe to embed in HTTP headers, HTML attributes, and JSON payloads. Common applications include email attachments (MIME), data URIs for inline images, API tokens, and the header/payload sections of JWTs. Paste your text in the left panel, choose encode or decode, and the result appears instantly — everything runs in your browser, so no data is ever transmitted to a server.