Base64 Encoder / Decoder

Base64 is a text representation for binary data. It is not encryption; it simply turns bytes into characters that travel safely through systems designed for text. Developers run into it in HTTP Basic Auth headers, email attachments, data URIs, API payloads, and JWT segments. A string may look opaque, but anyone can decode it unless it is encrypted separately.

This encoder converts Unicode text into Base64 safely, and the decoder turns valid Base64 back into readable text. URL-safe mode replaces characters that can be awkward in query strings or filenames, using hyphens and underscores instead of plus and slash. Removing padding is common in JWTs and compact tokens.

All work happens in the browser, so credentials, bearer tokens, and payload samples do not leave your machine. The tool also handles padding repair during decoding, which helps when you paste compact URL-safe strings copied from real web applications.