About
Vincula turns numbers into Roman numerals - and Roman numerals back into numbers - the instant you type. One field, no forms, no setup. Type 2026 and read MMXXVI, or type MMXXVI and get 2026 back.
Built to be fast, calm, and completely private. Everything runs on your device. No account, no sign-in, no internet required, and nothing collected.
WHAT MAKES VINCULA DIFFERENT
- Instant two-way conversion — Type a number to get its Roman numeral, or type a numeral to get the number.
- Automatic detection — Figures out which way you're going, no mode to pick.
- Tap to copy — Copy the result anywhere in one tap.
- Roman dates — Turn any date into Roman numerals for engravings, tattoos, and keepsakes.
- Automatic history — Recent conversions are saved automatically.
PRICING
Vincula works out of the box, with no account required. Vincula Pro is a one-time unlock (no subscription) that adds vinculum notation for numbers up to 3,999,999, custom date styles (reorder day, month, and year, choose your separator), a shareable date card export, and unlimited history.
FEEDBACK
Made by a small indie team. Email obeliskclubclub@gmail.com with feedback, bug reports, or feature requests.
Whether you are decoding a clock face, a movie copyright, a book chapter, or designing a date to keep, Vincula makes Roman numerals effortless.
Terms of Use (EULA): https://obelisk.club/romannumerals/terms
Need a quick one-off? Try the free Roman numeral converter in your browser.
Core Capabilities
Instant two-way conversion as you type
Automatic number and numeral detection
Roman dates for engravings and tattoos
Vinculum notation up to 3,999,999 with Pro
Date styles and shareable card export with Pro
Unlimited history with Pro
Interface

High Fidelity UI

High Fidelity UI

High Fidelity UI
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How Vincula compares
Honest, dimension-by-dimension comparisons — including where the other tool wins.