Base64 Encoder & Decoder - Text & File (URL-Safe Supported)

Paste your text or drop any file into the input box, keep the mode on Encode and the Base64 representation appears in the output. For files you get a data URL that can be embedded directly in HTML, CSS or JSON — no upload server in between.

URL-safe Base64 swaps "+" for "-" and "/" for "_" and strips the trailing "=" padding so the encoded value can travel inside URLs, filenames and JWT segments without further escaping. Toggle URL-safe whenever the output ends up in a query string, path segment or HTTP header.

No. Base64 is an encoding, not encryption. Anyone can decode the string in one click, so never use it as a secrecy mechanism. Reach for AES, RSA or libsodium when you need real confidentiality, and use Base64 only to make binary data text-safe.

Base64 packs three bytes into four characters. When the input length is not a multiple of three, the encoder pads the final block with "=" so the output stays a multiple of four. Standard Base64 keeps the padding; URL-safe Base64 drops it because the length is implicit.

Yes. The encoder reads the input as UTF-8 before encoding, so Arabic, Chinese, Cyrillic and emoji characters round-trip cleanly. The decoded result is rendered back as UTF-8 text, which is what every modern browser, terminal and API expects.

Base64 inflates payloads by roughly 33% — three bytes of input become four bytes of output. That is fine for short tokens, small icons and JSON-embedded thumbnails, but for large assets prefer a direct binary upload or a CDN link to keep transfers fast.

No. The encoder runs entirely inside your browser using the standard atob / btoa APIs plus a UTF-8 wrapper, so your text or file never reaches a server. That makes the tool safe for tokens, credentials and proprietary binaries you do not want to expose.