Category Hub
Encoding & Decoding
Encode and decode Base64, URLs, JWT tokens, and HTML entities securely in your browser. All encoding algorithms conform strictly to RFC specifications (RFC 4648, RFC 3986, RFC 7519) and execute locally with zero network transmission. Built specifically for developers needing private, client-side execution directly in the browser with zero server latency or data retention.
Core Engineering Workflows & Capabilities
Authentication Token Inspection
Inspect JWT claims, issuer fields, and expiration dates during OAuth2 and OpenID Connect authentication debugging.
URL Query String Construction
Safely encode special characters, query parameters, and URI components to prevent malformed HTTP requests.
Binary Asset Inlining
Convert small SVG icons, fonts, and images into Base64 data URIs for inline CSS and HTML embedding.
Available Tools (3)
Select any tool below to launch its interactive browser-based interface.
Common Tasks & Recommended Tools
Decode & Inspect JWT Tokens
Parse header metadata and payload claims without transmitting authentication secrets over the network.
Encode / Decode Base64
Convert text or binary data into RFC 4648 compliant Base64 strings with standard or URL-safe character sets.
URL Percent-Encoding
Encode query parameters and URI components per RFC 3986 to ensure safe HTTP transport.
Engineering Best Practices & Tips
- Distinguish Encoding from Encryption: Base64 and URL encoding are data representation schemes, not security mechanisms. Never rely on Base64 alone to protect sensitive data.
- Verify JWT Signatures Server-Side: Client-side decoding is useful for debugging claims, but server applications must always cryptographically verify JWT signatures before granting access.
- Use URL-Safe Base64 for Web Queries: Replace '+' with '-' and '/' with '_' when passing Base64 strings in URLs to prevent web servers from misinterpreting characters as delimiters.
Frequently Asked Questions — Encoding & Decoding
Are decoded tokens or keys sent to any server?
No. All encoding and decoding logic executes locally in your browser memory sandbox. No remote requests, logs, or caches are created.
Which standards do these encoding tools follow?
Our Base64 tools adhere to RFC 4648, URL encoding follows RFC 3986, and JWT decoding validates structures per RFC 7519.
Why does Base64 output sometimes end with '=' characters?
The '=' symbol is padding used when the input byte length is not a multiple of 3, ensuring the encoded stream aligns to 4-character blocks.