Free ASO Tool
App Store Keyword Field Optimizer
Pack your iOS keyword field to the 100-character limit. We strip duplicates, space-stealing commas, and words Apple already indexes from your title or subtitle.
Last updated: April 20, 2026
Words here are auto-indexed by Apple, so we drop them from your keyword field.
Same deal. Subtitle words are already indexed.
One per line, or comma-separated. Multi-word phrases stay together.
Strips Title Overlap
Words in your app name and subtitle are auto-indexed. We drop them so you do not burn characters twice.
Greedy 100-Char Packer
Walks your list in order, fits every keyword that will fit, and tells you exactly why the rest did not.
Comma-Only Separator
No spaces after commas. That is Apple's rule, and spaces cost you searchable characters.
How it works
Optional but recommended. Lets the optimizer skip words Apple already indexes.
One keyword per line, or comma-separated. Multi-word phrases stay intact.
Get a ready-to-paste, comma-separated string that fits in 100 characters.
The Keyword Field Optimizer is a free ASO tool that packs the iOS 100-character keyword field without wasting characters on title or subtitle duplicates. Apple automatically indexes every word in your app name and subtitle, so adding them to the keyword field is wasted space. The tool drops duplicates, formats comma-separated keywords without spaces (spaces count against the limit), and maximizes searchable terms.
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Frequently Asked Questions
What is the App Store keyword field character limit?
The iOS App Store keyword field has a 100 character limit. Keywords should be comma-separated with no spaces after commas (spaces count against the limit). This field is hidden from users but fully indexed by Apple for search ranking.
Should I repeat words from my app name or subtitle in the keyword field?
No. Apple automatically indexes every word in your app name and subtitle, so adding them to the keyword field wastes characters that could carry new searchable terms. The Keyword Field Optimizer drops these duplicate words for you.
Do spaces count against the 100-character keyword limit?
Yes. Every character counts, including spaces and commas. That is why the standard format is comma-separated with no spaces (e.g., "habit,tracker,daily"). Using spaces after commas costs you searchable keywords.
Should I use singular or plural forms in the keyword field?
Apple handles singular/plural matching automatically for many words, so you typically only need one form. Prefer the form your target users actually search for. Adding both "habit" and "habits" usually wastes characters.
How does Apple treat multi-word phrases in the keyword field?
Apple tokenizes comma-separated entries as discrete phrases. "habit tracker,daily routine" is indexed as two phrases: "habit tracker" and "daily routine". Apple also mixes your keyword tokens with title and subtitle tokens when building long-tail search matches, so phrase-level entries can still appear in broader searches.
How often should I update my App Store keyword field?
Most competitive App Store apps refresh metadata 2 to 4 times per year. Wait at least 4 weeks after a change before evaluating impact, since iOS keyword rankings take roughly that long to stabilize.
Keywords Locked In?
Now generate screenshots whose captions reinforce those same keywords. Apple indexes screenshot text as ranking metadata in 2026.
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