Free Online Encoding & Crypto Tools
Encode, decode, hash, and verify data with browser-based cryptography tools. Base64 encoding, JWT token inspection, and hash generation — all processed locally with zero server uploads.
Base64 Encode & Decode
Encode and decode Base64 strings
Image to Base64 & Back
Convert images to Base64 and Base64 to images
JWT Encode & Decode
Decode, encode, and verify JSON Web Tokens
Hash Generator
Generate MD5, SHA-256, SHA-512 hashes
Encoding & Cryptography Tools for Developers
Encoding and hashing are fundamental operations in web development, API security, and authentication workflows. DevToolKit provides four specialized tools that handle the most common encoding and cryptography tasks developers encounter daily — from Base64 encoding to JWT verification and hash generation.
The Base64 Encoder & Decoder converts text and binary data to and from Base64 encoding (per RFC 4648), supporting standard and URL-safe variants. For embedding images directly in HTML and CSS, the Image to Base64 converter accepts drag-and-drop, file upload, and clipboard paste, generating ready-to-use data URIs with automatic MIME type detection.
The JWT Encoder & Decoder inspects JSON Web Tokens (per RFC 7519) with color-coded header, payload, and signature sections, expiration checking, and signature verification using HS256, HS384, and HS512 algorithms. For data integrity verification, the Hash Generator computes MD5, SHA-1, SHA-256, and SHA-512 hashes with optional HMAC support — useful for verifying file integrity, comparing checksums, and generating API signatures.
All encoding and crypto operations run entirely in your browser using the Web Crypto API and JavaScript. Sensitive data such as JWT tokens, API keys, and passwords never leave your machine, making these tools safe to use with production credentials.