Numbers
Batch OTP & Verification Code Generator
Used by developers, writers, and creators worldwide.
A batch OTP generator is the fastest way to produce dozens or hundreds of one-time verification codes without writing a script. QA engineers use it to seed staging databases, developers use it to test 2FA flows, and marketing teams use it to pre-generate single-use promo codes before a launch. Set the count (up to 200), choose a code length, pick numeric or alphanumeric format, and optionally add a dash or space separator for readability. The output is a plain list, ready to paste into a CSV, SQL insert, or import file. Format choice has real consequences. A 6-digit numeric code has one million possible values; a 6-character alphanumeric code has over two billion. Pick whichever matches your system's validation regex.
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How to use
- Choose your options above
- Click Generate
- Copy your result
Detailed instructions
- Set the Count field to the number of codes you need, up to 200 per batch.
- Choose a Code Length that matches your system's validation — 6 for standard OTPs, 8 for higher-entropy codes.
- Select Code Format: choose Numeric for SMS-friendly codes or Alphanumeric for promo codes and invite tokens.
- Set Group Separator to Dash or Space if codes will be printed or manually transcribed; leave it as None for programmatic use.
- Click Generate, then copy the full output list and paste it into your database import file, spreadsheet, or test fixture.
Use Cases
- •Seeding 200 test OTP records into a Postgres staging database before a 2FA integration test
- •Pre-generating alphanumeric invite codes for a closed beta and importing them into a Notion tracker
- •Loading unique single-use promo codes into a Shopify discount import CSV for an email campaign
- •Populating a mock SMS OTP endpoint with realistic numeric codes for Cypress end-to-end tests
- •Printing dash-separated 8-character access codes on paper badges for a conference registration desk
Tips
- →Generate 20% more codes than you need to account for duplicates, then deduplicate in Excel or a script before importing.
- →For promotional codes, use alphanumeric format at length 8 — it balances uniqueness with something short enough to type from a printed mailer.
- →If your validation regex strips non-digits, always test with the separator off; a hidden dash will silently fail OTP verification.
- →Match this generator's length exactly to your production OTP length — mismatches in test data hide padding and truncation bugs early.
- →For conference or event codes, use length 4 or 6 numeric with a dash separator and print in a large font to minimize transcription errors at check-in.
- →Alphanumeric codes at length 6 provide about 2.2 billion combinations — sufficient for most invite pools, but increase to 8 characters for high-value voucher campaigns.
FAQ
how many digits should a verification code be
Six digits is the industry standard, used by Google, Apple, and most banking apps. Four digits works for low-stakes PINs where speed matters more than brute-force resistance. If your threat model demands more entropy, use 8 digits or switch to alphanumeric — a 6-character alphanumeric code is roughly 2,200 times harder to guess than a 6-digit numeric one.
are generated OTP codes guaranteed unique in a batch
Each code is independently random, so duplicates are statistically unlikely but not impossible. For 200 six-digit numeric codes, the collision probability is under 2%. If uniqueness is critical, generate a slightly larger batch than you need and deduplicate in your spreadsheet or import script before use.
when should I use the group separator option
Turn on dash or space separators when users will read or transcribe the code manually — it turns 847291 into 847-291 and cuts entry errors noticeably. Leave the separator off for any code consumed programmatically, since the extra character will break fixed-length validation in your backend or regex.