How does Text to Roman Numerals work?

Each character in your text is converted to its ASCII code (e.g. H=72, i=105), and that number is then expressed as a Roman numeral (72=LXXII, 105=CV). You can also switch to Numbers mode and enter integers directly.

What is the largest number Roman numerals can represent?

Standard Roman numerals represent numbers from 1 to 3,999 (MMMCMXCIX). This tool supports values up to 9,999 using extended notation. Values outside this range return "?".

Can I decode Roman numerals back to text or numbers?

Yes. Switch "Convert to" to "Text / Numbers (decode)" and paste your Roman numerals separated by spaces or commas. The tool reverses the conversion back to the original numbers or characters.

What does "hi" convert to in Roman numerals?

"h" has ASCII code 104 (CIV) and "i" has ASCII code 105 (CV), so "hi" converts to "CIV CV" — exactly as shown in the example.

What separator should I use?

For readability, the default space separator works well. Use comma or hyphen for a more compact or styled output. Use newline to put each Roman numeral on its own line, or choose "None" for a continuous string.

Workspace

Output will appear here…

▶Roman Numeral Reference Chart

IV4

IX9

X10

XL40

L50

XC90

C100

CD400

D500

CM900

M1000

Letters to Numbers

Trusted Conversion Tools

Text to Roman Numerals

Our free Text to Roman Numerals converter instantly translates any text or number into Roman numerals — choose your interpretation mode, pick a separator, and decode Roman numerals back to text, all in your browser.

Who Is It For?

Students & Educators

Learning Roman numerals, practising conversions, and checking homework answers instantly.

Designers & Typographers

Generating Roman numeral sequences for clock faces, chapter headings, wedding invitations, and decorative numbering.

Puzzle & Cipher Enthusiasts

Encoding or decoding text using Roman numeral ASCII substitution for escape room puzzles and ARGs.

Historians & Classicists

Converting dates, inscriptions, and ancient numbering systems for research or academic writing.

Developers & QA Engineers

Testing Roman numeral parsing logic and generating test data for numeral conversion algorithms.

How It Works

Select your input mode — "Text (ASCII)" converts each character to its ASCII numeric value and then to Roman numerals (e.g. "hi" → h=104=CIV, i=105=CV → "CIV CV"), while "Numbers" converts space or comma-separated integers directly. The separator dropdown lets you choose how Roman numerals are delimited in the output. Switch "Convert to" to decode mode and paste Roman numerals to reverse the process back to numbers or text. Everything runs instantly in your browser.

Features

Two input modes: Text (ASCII values) and Numbers (direct integers)
Bidirectional: encode to Roman numerals or decode back to text/numbers
Customisable separator — space, comma, hyphen, period, newline, or custom
Real-time output as you type
Character count badges on both panels
Expandable Roman numeral reference chart (I through M)
One-click copy to clipboard
100% browser-based — no data sent to servers

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