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Yes. 2fasolver.com is designed with security as the top priority. All OTP and TOTP codes are generated locally in your browser, which means sensitive information never leaves your device. We follow industry-standard authentication specifications and ensure the website is served over HTTPS at all times.

No. 2fasolver.com does not store any secret keys, OTP codes, or personal data. All code generation happens on the client side, and no information is transmitted to or saved on our servers.

All code generation is done entirely on the client side — in your browser. Our servers never see your secrets, seeds, or generated authentication codes. You can even go offline after loading the page and the tool will continue to work.

No. 2fasolver.com does not log individual user activity related to OTP generation. We may collect minimal, anonymous technical metrics (such as page load performance) solely to improve site reliability.

2fasolver.com generates one-time passwords (OTPs) based on the TOTP standard (Time-based One-Time Password). You enter your secret key, and the browser calculates a temporary code using HMAC-SHA1 and the current time. This code refreshes automatically every 30 or 60 seconds, just like any authenticator app.

TOTP (Time-based One-Time Password) generates codes based on the current time and expires every 30 seconds. HOTP (HMAC-based One-Time Password) generates codes based on a counter that increments with each use. Most modern services use TOTP, which is fully supported by 2fasolver.com.

Most services use 30-second TOTP codes (the default). Some use 60-second intervals. Check the documentation of the service you're using. If 30 seconds gives an "invalid" error, try switching to 60 seconds.

Yes. 2fasolver.com is fully compatible with Google Authenticator, Microsoft Authenticator, Authy, and other RFC-compliant 2FA apps. If a service supports standard TOTP, it will work with 2fasolver.com — the codes generated will be identical.

2fasolver.com supports RFC 6238 (TOTP) and RFC 4226 (HOTP). This ensures broad compatibility with most platforms and services that use two-factor authentication.

When you enable 2FA on a website, it usually shows you a QR code AND a text "manual entry key". It looks like a random string of uppercase letters and numbers, e.g. JBSWY3DPEHPK3PXP. Copy that string and paste it into 2fasolver.com.

The most common cause is a time sync issue. TOTP codes depend on your device's clock being accurate. Make sure your system time is set to automatic / network time. Also verify you copied the full secret key with no extra spaces or missing characters.

If you saved your backup / recovery codes when you first set up 2FA, use those. If not, contact the service's support team and verify your identity. This is exactly why storing your recovery codes somewhere safe is critical.

For beginners, Authy is highly recommended because it offers encrypted cloud backup. Other solid options include Google Authenticator, Microsoft Authenticator, and Aegis (open-source, Android only). Avoid SMS-based 2FA where possible — it's vulnerable to SIM-swapping attacks.