Base64 Encoder / Decoder

Base64 turns any data into a string made only of letters, digits, + / and = — characters that survive every text-based system unchanged. That's why it shows up everywhere in technical work: HTTP Basic authentication headers, email attachments, data: URLs embedding images in CSS, API payloads carrying binary content, JWT tokens, configuration secrets in Kubernetes and .env files. Sooner or later you need to encode something into base64 or peek inside a base64 blob, and this tool does both instantly.

This implementation is Unicode-safe, which cheap converters aren't. The naive JavaScript btoa() call fails on anything outside Latin-1 — Hindi, Tamil, emoji, the ₹ symbol — with a cryptic character-out-of-range error. Here the text is first encoded as UTF-8 bytes and then base64'd, the standard used by virtually all real systems, so "नमस्ते" and "₹500" round-trip perfectly. Decoding tolerates surrounding whitespace and reports clearly when the input isn't valid base64 (usually missing = padding or a stray character from a partial copy-paste).

One thing base64 is not: encryption. It's a reversible transport encoding — anyone can decode it, as you're about to prove with this tool. Never treat base64'd credentials as secured; if you can decode it here, so can anyone else. Everything runs locally in your browser, making it safe to decode tokens and secrets without them touching a server.