Base64 Tool — Encode & Decode Online

How to Use the Base64 Tool

1. Select the encoding type: Base64, URL Encode, HTML Entities, Hex, JWT Decode, or Unicode.
2. Paste or type your input text in the left panel.
3. Choose Encode or Decode, then click Run (or it updates automatically).
4. Copy the result with the Copy button or download it as a file.

Why Use This Base64 Encoder/Decoder

Base64 encoding is used everywhere in web development — from embedding images in CSS to encoding binary data in JSON APIs, sending attachments in email, and storing credentials in HTTP headers. Having a reliable, instant encoder/decoder in your browser saves countless trips to the terminal.

This tool handles six encoding formats in one place. The JWT decoder is especially useful for developers debugging authentication tokens: it splits the header, payload, and signature into color-coded sections, so you can instantly inspect claims without needing a separate tool. Everything runs locally — your tokens and secrets never leave your browser.

Frequently Asked Questions

• What is Base64 encoding?
  Base64 converts binary data into ASCII characters using a 64-character alphabet. It is used to safely transmit binary data over text-based protocols like HTTP, JSON, and email.
• Is Base64 encryption?
  No. Base64 is encoding, not encryption. It is easily reversible and provides no security. Never use it to protect sensitive data — use proper encryption instead.
• What is URL encoding?
  URL encoding replaces special characters with percent-encoded equivalents (e.g., space becomes %20) so they can be safely included in URLs and query strings.
• Can I decode a JWT here safely?
  Yes. JWT decoding is done entirely in your browser. The token contents are never transmitted anywhere. However, do not share the decoded output if it contains sensitive claims.