Base64 Encode/Decode

The Base64 Encode/Decode tool is a free base64 converter that turns plain text into Base64 and Base64 back into plain text, instantly and in your browser. Base64 is a binary-to-text encoding scheme built into email (MIME), and it shows up constantly in web development: embedding small images as data URIs, transmitting binary data inside JSON, and setting HTTP Basic Authentication headers. Developers use it dozens of times a week; this tool skips writing a one-off script every time.

Paste plain text to base64 encode it, or paste a Base64 string to base64 decode it back to readable text — the tool auto-handles both directions from the same input box, no separate encode and decode pages to hunt through. It's the fastest way to check what's actually inside a JWT segment, a webhook payload, an env variable holding a base64-encoded secret, or a data: URI you found in someone's CSS. Because it correctly implements Unicode-aware encoding, emoji, accented characters and non-Latin scripts (Japanese, Arabic, Cyrillic) round-trip exactly, which naive Base64 implementations often get wrong. It's also handy for quickly building a small inline image: base64 encode a tiny icon or logo and drop the result straight into a CSS background-image: url(data:image/png;base64,...) declaration or an <img> tag's src, skipping an extra HTTP request entirely.

The tool validates input strictly: if you paste text that isn't valid Base64 — wrong alphabet characters, incorrect padding — decoding fails with a clear error rather than silently returning corrupted or truncated output, a common failure mode with looser implementations.

One thing worth remembering: Base64 is an encoding, not encryption. It has no secret key and offers zero confidentiality — anyone can decode it in one click, including with this very tool. Never rely on Base64 alone to hide passwords, tokens or personal data; use real encryption if confidentiality matters. As always, conversion happens entirely client-side, so nothing you paste is uploaded.