Free tools → Keyword field optimizer
Keyword field optimizer
Apple's keyword field is exactly 100 characters, separated by commas with no spaces. Paste your keyword list — and, optionally, your title and subtitle — and this tool rewrites everything into one clean field: it removes words already indexed by your title or subtitle, strips filler words and duplicates, and trims the rest to fit. Copy it straight into App Store Connect.
Paste a list of keywords and we'll clean it into an App Store keyword field — removing anything already in your title or subtitle, plus filler words and duplicates.
Everything runs in your browser — nothing you paste is uploaded or stored. Characters are counted by Unicode code point, the way App Store Connect counts them. The limit is 100 characters: Apple's App Store Connect Help still says 100 bytes, but saved-string tests show characters are what's enforced (see the keyword field rules).
What it does
From a messy list to a clean keyword field
The keyword field is the most misformatted field in all of App Store metadata. Here's exactly what the tool fixes — and why each one matters for how Apple indexes your app.
Spaces become commas
Apple separates keywords with a single comma and nothing else: budget,planner,tracker. Every space after a comma costs one of your 100 characters and indexes nothing, so the tool strips them all — and splits multi-word phrases into single words while it's at it.
Title & subtitle words removed
Add your title and subtitle and the tool drops any keyword they already cover. Apple indexes those fields and combines them automatically, so repeating a word here just wastes characters.
Filler & duplicates stripped
Low-value connectors like and, the, your, new and app are removed, along with any word that repeats. Every freed character goes to a term that can actually rank.
Trimmed to 100
If the list is still too long, the tool keeps your keywords in the order you entered them and drops the ones at the end that don't fit — so put your most important terms first. It always shows you what was left out.
Need the limits for every other field too? Try the Metadata Character Counter. Filling more than one keyword field across markets? The Cross-Localization Explorer shows how many you actually have.
FAQ
Keyword field questions, answered
How should keywords be formatted in the App Store keyword field?
Separate keywords with a single comma and no space — for example budget,planner,tracker. Every character counts toward the 100-character limit, so spaces after commas are wasted. Paste your list in any format — spaces, commas or new lines — and the tool rewrites it as a clean, comma-separated, space-free field.
Why does the tool remove words that are already in my title and subtitle?
Apple already indexes every word in your app name and subtitle, and it automatically combines words across the name, subtitle and keyword field to form search phrases. Repeating a word you've already used wastes characters in the 100-character field without adding any new keyword. Add your title and subtitle and the tool strips any keyword they already cover — and shows you which words those were.
What are filler words and why are they removed?
Filler words are low-value terms that don't help you rank — connectors and generic words such as a, and, the, for, with, your, new, get and app. Apple's own guidance says filler words like “the” and “to” add no value and that generic terms like “app” are too broad, so the tool removes them to make room for real search terms.
What happens when my keyword list is longer than 100 characters?
The tool trims to fit by keeping your keywords in the order you entered them and dropping the ones at the end that no longer fit. List your most important keywords first, and the tool shows you exactly which terms were left out so you can decide what to keep or swap.
Should I include spaces or multi-word phrases in the keyword field?
You don't need them, though a phrase isn't wrong. Apple's App Store search guidance says to separate terms with commas and no spaces, and allows a space inside a phrase — its own example is Property,House,Real Estate. What wastes characters is a space after a comma. Single words are usually enough because Apple combines the individual words across your name, subtitle and keyword field to form search phrases, and its guidance says not to repeat words already in your app name, subtitle or category. That's why the tool splits phrases into separate keywords — fitness tracker becomes fitness,tracker — so any word your title or subtitle already covers can be dropped.
Is anything I paste into this tool stored or sent anywhere?
No. Everything runs in your browser with JavaScript. Nothing you paste is uploaded, logged or sent to any server — close the tab and it's gone.
Formatting is the easy part
The real wins come from choosing the right keywords in the first place — the terms with volume you can actually rank for, in every market you sell in. Book a free 30-minute call and we'll show you where your keyword strategy is leaving installs behind.
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