Encoding vs. Hashing: When to Use Base64, URL Encoding, and SHA-256
Confusing encoding with encryption or hashing is a common engineering pitfall. Learn when each primitive belongs in your stack.
Encoding Is for Transport, Not Security
Base64 and percent-encoding (URL encoding) exist purely to represent binary bytes or reserved ASCII characters safely across text-based protocols. Anyone can reverse Base64 in one function call.
One-Way Digests with SHA-256 and SHA-512
Cryptographic hash functions map arbitrary inputs to fixed-length digests. Use SHA-256 or SHA-512 for file integrity verification, webhook signatures, and content addressing, and reserve legacy MD5 strictly for non-security checksums.
Tools Mentioned in This Guide
Base64 Encoder & Decoder
Encode UTF-8 text or uploaded files to Base64 / Base64URL and decode Base64 strings safely in your browser.
URL Encoder & Decoder
Percent-encode or decode URLs, query parameters, and UTM strings cleanly and inspect parsed query key-value pairs.
Hash Generator (MD5 / SHA-1 / SHA-256 / SHA-512)
Compute MD5, SHA-1, SHA-256, SHA-384, and SHA-512 cryptographic digests for text or local files in your browser.
UUID Generator (v4 & v7)
Generate RFC-compliant UUID v4 (random) and UUID v7 (time-ordered) identifiers in bulk with uppercase/hyphen options.