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Checksum Lab

Hash, encode, decode, and inspect strings or tokens.

Small string utilities, minus the scattered tabs.

Checksum Lab is the kind of utility that usually ends up split across half a dozen sites. This version keeps the common string operations in one place so you can hash, encode, decode, and inspect tokens without leaving the placehold.wtf toolkit.

It is useful for quick integrity checks, auth debugging, query-string work, legacy MD5 lookups, JWT inspection, and generating password hashes for app configuration or admin setups.

Hash, encode, decode, or inspect

Run common checksum and token tasks without bouncing between one-off tools.

Hash and token toolbox
MD5, SHA, HMAC, and bcrypt hashing
Base64 and URL encode or decode
UUID v4 generation and JWT inspection
Operation logging for admin visibility

No. It decodes the header and payload for inspection only and does not verify authenticity.

Bcrypt includes a unique salt for each hash, so the same input will generate a different output while still verifying correctly later.