Free Online Encoder & Decoder Tools
Encode and decode data in any format. From Base64 and URL encoding to JWT tokens and HTML entities — convert between formats instantly in your browser.
Base64 Encode/Decode
Encode and decode Base64 strings instantly
URL Encode/Decode
Encode and decode URL components instantly
JWT Decoder
Decode and inspect JWT tokens — header, payload, and expiration
HTML Entity Encoder/Decoder
Encode and decode HTML entities for safe web content
Backslash Escape/Unescape
Escape and unescape special characters in strings
Image to Base64 Converter
Convert images to Base64 encoded strings with data URI support
Base64 to Image Decoder
Decode Base64 strings to preview and download images
About Encoder / Decoder Tools
Encoding and decoding are fundamental operations in web development. Whether you're working with API payloads, authentication tokens, URL parameters, or HTML content, these tools let you convert between formats without any server-side processing.
100% Client-Side
All processing happens in your browser. No data is ever sent to any server.
No Signup Required
Use all tools instantly without creating an account or providing any personal information.
Always Free
Every tool is completely free to use with no hidden limits or premium tiers.