Numeronym generator

Turn long words into short numeronyms like i18n

All computation runs locally in your browser

Last updated: March 1, 2026

Introduction / overview

A numeronym is an abbreviation where the middle of a word is replaced by a number. The number represents how many characters are between the first and last character.

Who is this for?

Developers and technical writers who use terms like $\mathrm{i18n}$ and $\mathrm{a11y}$ .
Product teams naming features, flags, and docs in a consistent way.
Students learning common abbreviations in software and UX.

If you also need clean, URL-friendly text, pair this tool with our Slugify string calculator.

How to use / quick start

1
Type a word
Use a single word such as “internationalization” or “accessibility”.
2
Read the numeronym
You’ll see the first letter, the count of middle letters, and the last letter.
3
Copy, share, or reset
Use the copy button to paste the result, or the share/favorite/reset buttons below the calculator.

Worked example 1: internationalization → i18n

Let $L$ be the word length. For “internationalization”, $L = 20$ .

L - 2

=

20 - 2

=

18

So the numeronym is $\mathrm{i18n}$ .

Worked example 2: accessibility → a11y

“accessibility” has $L = 13$ , so the middle count is $L - 2 = 11$ .

\mathrm{accessibility}\ \to\ \mathrm{a11y}

Real-world examples / use cases

Internationalization docs

In codebases, “internationalization” is often shortened to $\mathrm{i18n}$ . It keeps file names, flags, and docs easy to scan.

Input:internationalization→Output:

\mathrm{i18n}

Accessibility tickets

Teams commonly use $\mathrm{a11y}$ as a shorthand for “accessibility” in issue titles and labels.

Input:accessibility→Output:

\mathrm{a11y}

Feature flags and env vars

When space is tight (flags, env vars), a numeronym keeps names readable without losing the “shape” of the word.

Input:localization→Output:

\mathrm{l10n}

Technical writing

Glossaries and internal docs can use numeronyms as aliases. If you also need consistent casing, combine with our Case Converter.

Input:documentation→Output:

\mathrm{d11n}

Common scenarios / when to use

Issue labels

Create short labels that still look like the original word.

Chat shorthand

Use in Slack/Teams when you don’t want to type long terms repeatedly.

File names

Keep filenames compact while still recognizable at a glance.

UI microcopy

When a design spec needs shorthand, numeronyms can keep notes tidy.

Code identifiers

Useful for internal variables/constants in prototypes and quick scripts.

Learning & onboarding

Understand common industry shorthands like i18n, l10n, a11y.

When it might not fit

Public-facing text where readers may not recognize the shorthand.
Very short words (length $\le 3$ ), where abbreviating would not help.

Tips & best practices

Make numeronyms readable

Prefer well-known ones (i18n, l10n, a11y) in public docs.
If the word is ambiguous, keep the full term at least once, then use the numeronym.
When you need consistent casing (e.g., kebab-case), run the original through the Case Converter first.

Want to validate patterns like “a11y” inside a text? Our Regex tester can help you build a safe matcher.

Calculation method / formula explanation

Let a word be a string with length $L$ . If $L \le 3$ , the tool returns the word unchanged. Otherwise it returns:

\text{numeronym}(w)=w_1\,(L-2)\,w_L

Variable meanings

$w$ : the input word
$L$ : length of the word
$w_1$ and $w_L$ : first and last character

Related concepts / background info

Numeronyms sit next to a few other shorthand styles:

Acronym

Forms a new word from initials (e.g., “NASA”).

Initialism

Reads each initial letter (e.g., “API”).

Numeronym

Keeps first/last letter and replaces the middle with a count (e.g., i18n).

Frequently asked questions

Why does “internationalization” become i18n?

Because there are $18$ letters between the first $\mathrm{i}$ and the last $\mathrm{n}$ . In general, the number is $L-2$ .

Does the tool change short words?

No. If the length $L \le 3$ , the output is the same as the input.

Can I input a phrase with spaces?

You can, but the tool treats the entire input as one string (spaces count toward length). For clearer results, use a single word.

Why do some symbols or emoji behave strangely?

The length is based on how the browser counts characters in a JavaScript string. Some characters (like emoji or combined accents) can be counted differently than you expect.

Is this calculator private?

Yes. The computation runs locally in your browser; your input isn’t sent anywhere by the calculator itself.

How can I share a result with a teammate?

Use the Share button and enable “share with results” to include the input word in the URL.

Limitations / disclaimers

This tool is designed for convenience and consistency. It does not validate whether a numeronym is “standard” in your industry.

Results for non-ASCII text may be surprising due to how string length is counted.
For phrases, spaces and punctuation are included in the count.

External references

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