TOTP & HOTP Code Generator
Generate time-based or counter-based one-time codes with SHA-1, SHA-256 or SHA-512.
Loading Tool…
What Is the TOTP & HOTP Code Generator?
Generate time-based or counter-based one-time codes with SHA-1, SHA-256 or SHA-512.
How It Works
Enter a Base32 test secret, choose TOTP or HOTP, digit count and algorithm, then generate a code. TOTP uses your device clock; HOTP uses your explicit counter.
When to Use It
Testing authenticator interoperability against RFC 4226 and RFC 6238. Secrets are not persisted; this is not a cloud-backed authenticator.
Frequently Asked Questions
- Is My Input Uploaded?
- No. Processing runs locally in this browser tab. These tools do not upload or persist your input.
- Can I Save The Result?
- Use Copy or Download after processing. Supported text reports also offer a PDF export. Keep original files until you have checked the result.
Found an issue? Send Feedback. See our data sources and update policy for tools that depend on changing information.
Popular Tools
Text Tools
Title Case Converter
Convert text to title case with smart rules for articles, conjunctions and prepositions.
Developer Tools
QR Code Generator
Create styled QR codes for URLs, text, email, SMS and calendar events, then export them for screen or print.
Developer Tools
JSON Formatter & Minifier
Beautify, validate and minify JSON with clear parse errors.
Font Styles
Unicode Text Converter
Preview your text in 35+ Unicode styles at once with copy buttons and favorites.
Text Tools
Word Counter
Count words, characters, sentences and paragraphs in real time, with reading time and keyword density.
Crypto & Security
Strong Password Generator
Generate secure random passwords using cryptographic randomness.