Security & Privacy Tools

Password strength, checksums, HMAC, JWT verification and AES encryption.

Password Strength CheckerEstimate password strength from entropy and weak patterns.File Checksum CalculatorSHA digests of a file to verify downloads.File Hash ComparatorCompare two files byte-for-byte via SHA-256.HMAC GeneratorKeyed message authentication with WebCrypto HMAC.JWT Signature VerifierCryptographically verify HMAC-signed JWTs.Text Encrypt / DecryptAES-256-GCM authenticated encryption in your browser.

About these security tools

Security utilities built on WebCrypto — the same primitives your browser's HTTPS uses. Real AES-GCM encryption, real HMAC signature verification, and passwords that never leave the tab.

Each tool is a small, focused utility with its own page, its own instructions and its own set of supported inputs. There is no account to create and no server-side processing step: the work happens on your device.