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.

Switch the mode to Decode, paste your Base64 string, and the original text appears instantly in the output, ready to copy or download as .txt. If the string uses '-' and '_' instead of '+' and '/', turn on URL-safe so it decodes correctly.

Yes. Switch to Decode mode and paste the Base64 or data URL text — if it decodes successfully, a "Download as file" button appears next to the plain Download option. Clicking it writes out the exact original bytes with the extension detected from the embedded MIME type, so a base64-encoded photo or PDF comes back as a real, openable file instead of garbled text.

Download always saves the decoded output as a plain .txt file, which is right when the Base64 represents text. Download as file only appears when the decoded bytes are recognized as binary data — like an image or PDF — and it reconstructs the original file with its proper extension instead of dumping raw bytes into a text file that won't open correctly.