OTP TOTP/HOTP generator and validator
Generate and validate OTP codes
Create TOTP or HOTP codes from a Base32 secret and verify a code with the selected algorithm, period and digit count.
The otpauth URI and QR preview make it easier to test authenticator app configuration.
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The tool runs directly in the browser and is ready for quick checks without installing software.
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Input can be cleared and recalculated immediately, which is useful for repeated small tasks.
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Use fullscreen mode when you need more space for long text, structured data or large result blocks.
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Copy buttons are available on generated output so results can be reused in code, documents or support chats.
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Most operations are deterministic: the same input and options produce the same output.
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For sensitive content, prefer local browser tools and review the result before sharing it further.
