What is Base64?

Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It is commonly used to:

• Embed binary files (images, PDFs) in HTML or CSS
• Encode data in URLs and cookies
• Transmit data over text-only protocols (e.g., email via MIME)
• Store complex data in JSON or XML

How to use

• Type or paste your text in the Input box, then click 🔒 Encode or 🔓 Decode.
• Use ⇄ Swap to push the output back into the input for chained operations.
• Enable URL-safe mode to produce output safe for URLs and JWT tokens (+→-, /→_).
• Click 📎 Encode file… to upload any file and get its Base64 Data URL (e.g. for embedding images in HTML/CSS).
• When the decoded result is an image Data URL, a live preview is shown automatically.