TOTP/2FA Authenticator & Token Generator
Generate RFC6238 TOTP codes from Base32 secrets or otpauth URIs, preview current and upcoming tokens, and test MFA flows locally in your browser with no server uploads.
Generate RFC6238 TOTP codes locally from Base32 secrets or otpauth URIs with configurable algorithm, digit length, and period settings. Ideal for debugging 2FA integrations and OTP validation logic.
Live RFC6238 TOTP Generation
Generate one-time passwords from Base32 secrets using RFC6238-compatible HMAC workflows with second-by-second refresh for realistic token validation tests.
Current and Next Token Preview
View both current and upcoming TOTP codes plus countdown timers so teams can test edge transitions, code rollover behavior, and backend tolerance windows.
Browser-Only Secret Handling
All secret parsing and code generation runs locally in your browser. Secrets and otpauth URIs are never uploaded, which supports safer testing for security-sensitive MFA integrations.
Free and Unlimited
Generate as many TOTP codes as needed for QA, integration testing, and incident diagnostics with no account requirement, no usage caps, and no subscription barriers.
2FA Integration Testing
Validate server-side OTP verification logic during onboarding of TOTP-based MFA in web and mobile apps.
Clock-Skew Debugging
Compare generated tokens across time windows to identify drift issues between authenticator clients and backend verification services.
otpauth URI Validation
Parse otpauth provisioning URIs from QR workflows and confirm issuer/account fields and secret handling.
Security Incident Triage
Reproduce OTP generation behavior quickly when diagnosing user reports of failing MFA login attempts.
Developer Training
Demonstrate how RFC6238 time-based counters and HMAC algorithms translate into rotating OTP values.
Migration Verification
Confirm compatibility when moving from legacy OTP libraries to modern auth stacks with configurable hash algorithm and digit policies.
TOTP/2FA Authenticator & Token Generator creates time-based one-time passwords according to RFC6238. It accepts Base32 secrets directly or extracts secrets from otpauth provisioning URIs, then computes codes locally with browser-native cryptographic primitives.
How TOTP Works
TOTP is derived from HOTP by replacing the counter with a time-step counter. The secret key and current step are hashed with HMAC, and dynamic truncation extracts an integer that is reduced to 6 or 8 digits. The code rotates every configured period, typically 30 seconds.
Algorithm and Policy Controls
Different identity providers may use SHA-1, SHA-256, or SHA-512 with varying digit length and period. This tool allows explicit control over those settings so you can replicate production behavior during QA and troubleshooting sessions.
otpauth URI Support
Provisioning URIs encoded in QR setup flows can be pasted directly. The tool extracts secret, issuer, and account values for quick verification without requiring camera or external scanner dependencies.
Security and Privacy
All processing is local: secrets are never transmitted to remote servers. This makes the tool suitable for sensitive debugging scenarios where MFA secrets must remain confined to the local workstation.
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Frequently Asked Questions About TOTP/2FA Authenticator & Token Generator
TOTP is a time-based one-time password standard defined in RFC6238. It is derived from HOTP but uses time windows instead of a manually incrementing counter, which makes it ideal for 2FA login flows where codes rotate every 30 or 60 seconds.
Yes. You can paste an otpauth provisioning URI and the tool extracts the secret along with issuer and account metadata. This helps validate setup flows copied from QR provisioning links or authenticator enrollment payloads.
The generator supports SHA-1, SHA-256, and SHA-512 with 6-digit or 8-digit token output. These settings cover common MFA implementations across most identity providers and enterprise authentication platforms.
Token differences usually come from mismatched secret value, algorithm, digit count, period, or local clock drift. Ensure all parameters match exactly and verify system time synchronization on both devices before troubleshooting further.
No. Secret parsing and token computation happen entirely in your browser. Secrets are not uploaded to external services, which keeps MFA testing workflows private and reduces the risk of credential leakage.
This tool is intended for debugging, validation, and operational troubleshooting. Production authentication systems should use hardened backend verification, secure secret storage, and proper access-control policies around MFA enrollment and reset paths.
Yes. The TOTP/2FA Authenticator & Token Generator is free, requires no signup, and can be used repeatedly for integration tests, support workflows, and educational demonstrations of OTP behavior.