What is the difference between an acronym and an initialism?

An initialism is read letter by letter, like FBI. An acronym is pronounced as a word, like NASA. Both are built the same way, by taking the first letter of each word, so this tool generates either kind.

Why skip small words?

Real-world acronyms often drop short connecting words. North Atlantic Treaty Organization becomes NATO, not NATTO, because of and the style omits low-content words. Turn the option on to mimic that convention.

What happens with punctuation or numbers?

Leading punctuation on a word is ignored, and the first letter or digit found is used. A word like 3D contributes a 3, so codes and model names are handled sensibly.

Does the order of words matter?

Yes. Letters are taken in the same order the words appear, so the acronym preserves the phrase's sequence. Rearranging the input changes the result accordingly.

Initialism / Acronym Generator

An initialism or acronym is formed by taking the first letter of each word in a phrase. This generator does that instantly and offers the small refinements real acronyms use, such as dropping connecting words and adding periods.

How it works

The phrase is split into words on whitespace, and the first letter or digit of each word is collected:

words = phrase.split(/\s+/)
for each word:
    if skipSmallWords and word in {of, the, and, ...}: skip
    take the first letter or digit of the word
result = letters joined (optionally with periods), optionally uppercased

Leading punctuation is ignored so a quoted or parenthesised word still contributes its first real character. Stop words are only skipped after the first letter, so a leading “The” is never dropped from the start.

Example and tips

Portable Document Format produces PDF. With small-word skipping turned on, North Atlantic Treaty Organization produces NATO. Enable periods for a classic style such as U.S.A.. For brand or project names, try the result both with and without small words to see which abbreviation reads best.