About Base64 Studio

Base64 Studio is a free, fully client-side Base64 encoder and decoder built for developers. It runs entirely in your browser — no accounts, no uploads, no data ever sent to a server. Encode text and files to Base64, decode Base64 back to readable text, preview images, detect JWT tokens, and inspect JSON — all in real time with zero latency.

Features

• Text Encode & DecodeEncode any UTF-8 text to Base64 or decode back
• Auto-Detect ModeAutomatically detects whether to encode or decode
• URL-Safe Base64Outputs RFC 4648 URL-safe variant (- and _ chars)
• File Drag & DropDrag any file to encode it to Base64
• Image PreviewAutomatically renders Base64-encoded images
• JWT DecoderDetects and decodes JWT tokens with expiry status
• JSON PreviewPretty-prints decoded JSON with syntax view
• Conversion HistoryRecalls last 20 conversions from localStorage

Frequently Asked Questions

What is Base64 encoding?

Base64 is a binary-to-text encoding scheme that represents binary data using 64 printable ASCII characters. It's widely used to embed binary data (images, files) inside text-based formats like JSON, HTML, and email.

Is my data safe?

Yes. Base64 Studio is 100% client-side. All encoding and decoding happens in your browser using JavaScript. Your data is never sent to any server, never stored in a database, and never logged.

What is URL-safe Base64?

URL-safe Base64 (RFC 4648 §5) replaces + with - and / with _, and omits = padding. This allows Base64 strings to be used safely in URLs and filenames without percent-encoding.

Can I encode files?

Yes. Drag and drop any file onto the input panel, or click "Open File". Images are rendered as a live preview. The tool uses the FileReader API — no file ever leaves your browser.