Decode API payloads
Use Base64 decoding and JSON formatting together to inspect encoded API responses, webhook data or integration payloads.
Encoding tools
Free online encoding and decoding tools
Encode and decode data directly in your browser. Use these tools for Base64 strings, URL parameters, JWT tokens, JSON payloads, timestamps and API debugging workflows.
Essential encoding tools
Start here when you need to encode, decode or inspect data used in APIs, authentication flows, integrations and web applications.
Base64 Encoder and Decoder
Encode text to Base64 or decode Base64 strings directly in your browser. Useful for API payloads, credentials, tokens and debugging.
URL Encoder and Decoder
Encode and decode URLs for query strings, redirects, callback URLs, OAuth flows and API parameters.
JWT Decoder
Decode JSON Web Tokens and inspect header, payload, claims, expiration time and signature.
Related developer tools
Encoded data often contains JSON, timestamps or text that later needs formatting, inspection or token estimation.
JSON Formatter and Validator
Format and validate decoded JSON payloads, API responses and structured data.
Unix Timestamp Converter
Convert timestamp fields such as exp, iat and nbf into readable dates.
LLM Token Estimator
Estimate token usage and approximate cost for decoded text, JSON payloads and AI prompts.
Common use cases
Debug OAuth and redirect URLs
Decode URL parameters, callback URLs and redirect values when working with authentication flows or API integrations.
Inspect token-based data
Decode JWTs, inspect claims and convert timestamp fields to understand token validity and authorization context.
Local encoding, safer debugging
Encoding tools are often used with sensitive strings, tokens and payloads. These tools are designed to run in your browser, making them practical for fast debugging without sending your input to external servers.