Base64 Encoder - Decode Strings Instantly Free

Paste your text and the Base64 output appears instantly. Copy it with one click.

Yes. Switch to decode mode, paste any Base64 string, and get the original text back.

Yes. Encoding runs locally in your browser. Note that Base64 is an encoding, not encryption, so never use it to hide secrets.

It is handy for embedding data in URLs, emails, JSON, or HTML where only plain text is allowed.

Yes. The tool encodes UTF-8 text correctly, including accented characters and emoji.

Base64 turns binary data or special characters into plain text that travels safely through email, URLs, JSON and HTML. Developers use it for small embedded images, API tokens and configuration values. It is a transport encoding at heart, designed for systems that only accept ordinary text characters.

Tokens such as those in a JSON Web Token use Base64url, a close variant that swaps two characters so the text survives inside web addresses. You can decode the header and payload segments to inspect their JSON content. Remember that decoding only reveals the data, it never verifies the signature.

The plus, slash and equals padding characters make standard Base64 unsafe inside a URL without extra escaping. The URL-safe variant replaces plus and slash with hyphen and underscore. This tool outputs standard Base64, so convert those two characters afterwards if your system expects the URL-safe form.

First check for missing characters, stray spaces or lost equals-sign padding, because Base64 strings must keep a length that matches their content. Copy the full string again from its source and avoid manual edits. If decoding still fails, the input was probably never valid Base64.

The text may be double-encoded, or you may be decoding something that was already decoded once. Decode it once and inspect the result before repeating the step. If the output still looks like a Base64 string after one pass, the content was likely wrapped more than once.