Base64 Encode / Decode

Developer

Convert any string to its Base64 representation or decode Base64 encoded data back to readable text.

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Works great for

🖼️

Encoding images & fonts

Convert images or web fonts to Base64 data URIs so they can be inlined directly into CSS or HTML, eliminating extra network requests. Ideal for small icons and critical above-the-fold assets.

🔑

API authentication headers

Generate Base64-encoded Basic Auth credentials for HTTP Authorization headers in API testing workflows. Paste username:password, encode once, and drop the result straight into curl or Postman.

🪙

JWT payload debugging

Decode the header and payload segments of a JSON Web Token to inspect claims, expiry timestamps, and algorithm fields without installing any tooling. Spot misconfigured tokens during API integration.

📧

Email attachment encoding

MIME email attachments use Base64 encoding to safely transmit binary files as ASCII text. Encode a file's content here to manually construct or inspect MIME-formatted email bodies.

🔗

Inline data URIs for CSS

Encode SVG icons and small PNGs to Base64 for use as background-image data URIs in stylesheets, keeping design assets bundled and cache-friendly without separate image files.

🕵️

Debugging encoded payloads

Decode Base64 strings found in API responses, cookies, or config files to reveal the underlying JSON, XML, or binary content. A quick sanity check when tracing unexpected data in network logs.

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Frequently asked questions

How do I encode text to Base64 without installing software?

Type or paste your text into the input field and the Base64 encoded string appears instantly in the output field. Switch the mode toggle to decode a Base64 string back to plain text just as quickly.

Does Base64 encoding work with Unicode and special characters?

Yes, the encoder handles Unicode strings including accented letters, emoji, and non-Latin scripts, converting them correctly to and from Base64 rather than only supporting plain ASCII text.

Is my text sent anywhere when I encode or decode it?

No, Base64 encoding and decoding runs in your browser, so the text you paste never leaves your device. It is safe to use for quick checks on tokens, credentials, or snippets you would not want to upload.

Can I use this to decode a Base64 encoded image or data URI?

You can paste a Base64 string from a data URI to decode its contents, though this tool is built for text. For saving a Base64 string as a downloadable image file, use the Image Base64 decode tool instead.