Free security & crypto tools

Generate cryptographically strong passwords in your browser. Length, symbols and bulk mode — copy instantly, no server.

Compute MD5, SHA-1, SHA-256 and SHA-512 hashes in your browser. Text or files — no server upload.

Generate cryptographically random UUID v4 values in your browser. Single IDs or bulk lists — copy with one click.

Score password strength locally. Tentaco Password Strength: review input and get an instant result — free, no sign-up.

Generate cryptographically random hex bytes. Tentaco Random Hex: review input and get an instant result — free, no sign-up.

Generate compact unique IDs. Tentaco Nano ID Generator: review input and get an instant result — free, no sign-up.

Generate secure random strings and IDs of any length. Tentaco Random String Generator: review input and get an instant result — free, no sign-up.

Encrypt or decrypt text with a Caesar shift or ROT13. Tentaco Caesar Cipher / ROT13: review input and get an instant result — free, no sign-up.

Compute CRC32 checksum as hex. Tentaco CRC32 Calculator: review input and get an instant result — free, no sign-up.

Mask a card number showing only last digits. Tentaco Credit Card Mask: review input and get an instant result — free, no sign-up.

Check if an email address looks valid. Tentaco Email Validator: review input and get an instant result — free, no sign-up.

Check if a string is a valid IPv4 address. Tentaco IPv4 Validator: review input and get an instant result — free, no sign-up.

Validate ISBN-10 and ISBN-13 numbers. Tentaco ISBN Validator: review input and get an instant result — free, no sign-up.

Validate card numbers with the Luhn algorithm. Tentaco Luhn Validator: review input and get an instant result — free, no sign-up.

Generate numeric PIN codes. Tentaco PIN Generator: review input and get an instant result — free, no sign-up.

Generate multiple UUIDs at once. Tentaco Batch UUID Generator: review input and get an instant result — free, no sign-up.

Passwords, hashing, JWT, HMAC and cipher tools in one workspace. Tentaco Security Studio: review input and get an instant result — free, no sign-up.

Generate sortable unique ULIDs. Tentaco ULID Generator: review input and get an instant result — free, no sign-up.

Generate time-sortable UUID v7 identifiers. Tentaco UUID v7 Generator: review input and get an instant result — free, no sign-up.

Generate bcrypt password hashes locally. Tentaco Bcrypt Hash: review input and get an instant result — free, no sign-up.

Encode and decode Base58 (Bitcoin alphabet). Tentaco Base58 Encoder: review input and get an instant result — free, no sign-up.

Scan files for sensitive data and clean them locally before sharing.

German letter templates for cancellations and compliance. Tentaco Legal Compliance Studio: review input and get an instant result — free, no sign-up.

Hash, encode, decode and generate secrets locally in your browser.

Tools that run locally without uploading your data — GDPR-conscious workflows.

Generate SHA-256, MD5, bcrypt and HMAC hashes locally for dev and integrity checks.