# Free tools

> Browser tools for people who send messages and verify phone numbers. No account needed.

Source: https://getoxtro.com/tools

- [WhatsApp link generator](https://getoxtro.com/whatsapp-link-generator.md): Create a wa.me click-to-chat link with a pre-filled message, a QR code to print, and a button for your website.
- [SMS character counter](https://getoxtro.com/character-counter.md): Count characters and SMS parts, see GSM-7 or Unicode encoding, and fix the characters that double the cost of a text.
- [Phone number formatter](https://getoxtro.com/phone-number-formatter.md): Convert a list of phone numbers to E.164, validate them by country, spot landlines and duplicates, and download a clean CSV.
- [2FA code generator](https://getoxtro.com/2fa.md): Generate and test TOTP codes from a secret, check a code against the clock, and make a QR code for an authenticator app.
- [Webhook signature checker](https://getoxtro.com/webhook-signature-checker.md): Verify HMAC webhook signatures from Oxtro, Stripe, GitHub, Shopify or Slack, see the exact signed string, and sign test payloads.