🔣 Base64 Encoder / Decoder

This free Base64 encoder and decoder converts text to Base64 and back instantly, with full UTF-8 support — so accented characters, non-Latin scripts and emoji survive the round trip intact. Base64 is everywhere in modern computing: it is how email attachments travel, how images get embedded in CSS and HTML as data URIs, how HTTP Basic Auth credentials are transmitted, and how JSON Web Tokens (JWTs) package their payloads. When you need to encode a string for an API, or decode a Base64 blob you found in a config file, a log line or a token, this tool does it in your browser with nothing uploaded or logged. Choose Encode or Decode, paste your text, and the result appears as you type.

How to use

1. Choose the mode: Encode to convert plain text into Base64, or Decode to turn Base64 back into readable text.
2. Paste or type your input — the result appears instantly, no button needed.
3. Encoding example: 'Hello' becomes 'SGVsbG8=' — the trailing = signs are padding and are part of the output.
4. Decoding: paste the Base64 string exactly, including any = padding at the end.
5. If decoding fails, check for missing characters, line breaks inserted by email clients, or URL-safe variants that use - and _ instead of + and /.
6. Click Copy to grab the output for your code, API request or config file.

Why use our base64 encoder / decoder?

The main reason to use this converter is that it runs entirely locally. Base64 strings frequently contain things you should not paste into arbitrary websites — API credentials, auth headers, token payloads, configuration secrets. Here, encoding and decoding happen in your browser and nothing ever leaves your device. Full UTF-8 handling is the second win: many quick converters mangle emoji and non-English characters because they ignore character encoding; this one gets 'héllo 👋' right in both directions.

It is also honest about what Base64 is: an encoding, not encryption. Anyone can decode it, so it must never be used to protect secrets — for real credentials, generate something strong with the password generator. In daily developer work it slots in alongside the JSON formatter — decode a JWT segment here, then pretty-print the JSON payload there — and alongside the QR code generator when you want to move an encoded snippet from screen to phone.

Who is this tool for?

Developers use Base64 constantly: building Basic Auth headers, embedding small images as data URIs in CSS, inspecting the payload of a JWT during authentication debugging, and encoding binary-ish content for JSON APIs that only accept text. DevOps engineers meet it in Kubernetes secrets, which are Base64-encoded by design, and in CI/CD environment variables and certificate bundles.

QA engineers decode tokens and webhook payloads while reproducing bugs. Security analysts and IT support decode Base64 strings found in email headers, logs and suspicious scripts to see what they actually contain. Students learning web development use it to understand how data URIs and HTTP authentication actually work under the hood. Email administrators troubleshoot MIME-encoded message parts. Even no-code builders occasionally hit an API that demands Base64-encoded input — paste, encode, done. If your work ever touches an API, a token or a config file, you will need this converter sooner rather than later.

Frequently asked questions