What the App Store description is for

In App Store Connect, the description is the primary long-text field on the product page. Unlike keywords, shoppers can read it. Unlike promotional text, it is not the short seasonal blurb above the fold. Unlike What's New, it is not version-specific release notes. It is the durable pitch for why someone should install — in the language of that storefront.

  • Hard ceiling: 4,000 characters (you rarely need all of them; clarity beats length).
  • Visible on the product page — write for humans first, indexing second.
  • Locale-specific: each App Store localization gets its own description string.
  • Supports paragraphs and line breaks; use them so mobile scanners can find benefits fast.
  • Should reinforce vocabulary from title, subtitle, and screenshot captions — not contradict them.

Long description localization ASO is not "translate the English blob." It is rewriting the pitch so a shopper in that market recognizes the job-to-be-done, trusts the proof, and sees the same product your creatives already showed.

Description vs promotional text, What's New, and keywords

Before you draft a single locale, separate the jobs of the text fields. Mixing them produces stuffed descriptions and empty release notes.

  • Title / subtitle: brand + primary and secondary phrases shoppers see immediately.
  • Promotional text: short, editable without a full binary review in many cases — seasonal hooks, not the full pitch.
  • Description: stable product story, benefits, feature clusters, social proof cues.
  • What's New: what changed in this version — localize it too, but do not dump the whole product pitch here.
  • Keywords: index-only 100-character field — never paste keyword lists into the description as comma salad.

When you localize, keep those boundaries. A German description should not become a keyword dump because someone ran out of room in the keywords field. A Japanese What's New should not replace a missing Japanese description.

Research the pitch per locale (not via literal translate)

App store description localization fails most often when English benefit order, idioms, and feature names are translated word-for-word. Markets differ in which proof points land first, how formal the register should be, and which competitor vocabulary shoppers already use.

  1. Start from the job-to-be-done in that language — what would a shopper type or say before they find you?
  2. Read top localized competitors' descriptions for structure and vocabulary (steal patterns, not claims you cannot support).
  3. Align feature names with your localized UI strings and screenshot captions so the page feels like one product.
  4. Decide benefit order for that market: privacy, speed, offline, price, collaboration — the English order is not universal.
  5. Flag idioms, sports metaphors, and culture-bound examples for rewrite, not translate.
  6. Keep a glossary of must-match terms (feature names, plan names, category words) so every locale stays consistent.

Keep the description sheet beside your subtitle, keywords, and screenshot caption sheets. When you localize listing assets at https://asolocalization.com, treat the long description as part of the same locale checklist — not an English afterthought pasted on ship day.

Structure that works on a phone-sized product page

Most shoppers expand the description after screenshots. They scan. A wall of text loses them even in their native language.

  1. Open with 1–2 sentences of outcome (who it is for + clearest benefit).
  2. Follow with short benefit bullets or tight paragraphs — one idea each.
  3. Cluster features under skim-friendly mini-headings or line-broken labels if your style guide allows.
  4. Add proof where you have it (ratings cues, notable use cases, "used by" lines that are true).
  5. Close with a clear next step (download, try free, see plans) without keyword stuffing.
  6. Cut anything that only exists to repeat the title for SEO — Apple and shoppers both notice mush.

Character expansion matters: German and French often grow 20–30% versus English. Japanese and Chinese may need different paragraph rhythm. Always count after localization, then cut for scanability — do not ship a 3,900-character English essay that becomes an unreadable 4,800-character overflow attempt.

ASO without stuffing the long description

Yes, relevant language in the description can support relevance. No, repeating your primary keyword twelve times does not make a better listing. Localize for meaning; place natural phrases where a human would write them.

  • Use primary and secondary phrases once or twice in natural sentences — especially in the opening.
  • Prefer synonyms and related intents that help real understanding over exact-match spam.
  • Never paste the keywords field into the description.
  • Do not invent competitor names or trademark abuse for ranking.
  • Match the vocabulary of your localized screenshots so the whole page reinforces one story.
  • If a phrase only exists for ranking and reads awkwardly in that language, delete it.

The ranking system and the conversion system share the same page. A stuffed description that tanks conversion is a failed ASO move even if a query "matches."

Workflow: ship description locales with the rest of the listing

Treat App Store Connect description locales as a release checklist item — first launch, major repositioning, or creative refresh — not a separate translation ticket that arrives weeks later.

  1. Freeze source-locale structure: opening, benefit order, feature clusters, proof, CTA.
  2. For each target locale: research vocabulary, rewrite (not blind translate), align glossary with UI and captions.
  3. Run length and scan checks on a phone-width preview.
  4. Paste into App Store Connect per localization with title, subtitle, keywords, and promotional text.
  5. QA: native reviewer or bilingual teammate reads for tone, false claims, and glossary drift.
  6. Ship with screenshots for that locale whenever possible so text and creatives match on day one.
  7. After go-live, watch conversion and support tickets mentioning "not what I expected" in that language — iterate the weakest locales first.

Do not localize screenshots into a market while leaving the description in English. Shoppers notice the mismatch immediately; so does your conversion rate.

Common mistakes to avoid

  • Pasting the English description into every localization.
  • Raw machine translation without glossary, benefit reorder, or scan edit.
  • Keyword stuffing and comma lists inside the long description.
  • Copying promotional text or What's New into the description (or the reverse).
  • Feature-name drift versus localized UI and screenshot captions.
  • Ignoring expansion languages until App Store Connect rejects or truncates your paste.
  • Shipping description-only updates while creatives still show English UI.
  • Over-long essays nobody expands past the first paragraph.

Any one of these turns a conversion asset into noise. The fix is process: research per locale, structure for scanning, keep field jobs separate, ship with the listing.

Localize the description like you mean the storefront

App Store description localization is the difference between a storefront that feels native and one that feels exported. Shoppers who already liked your screenshots still need a clear, local pitch before they tap Get. Give every locale a description written for that market — same product truth, different language and emphasis.

When you run screenshot and metadata localization in one pass at https://asolocalization.com, keep the App Store Connect description on the same locale checklist as title, subtitle, keywords, and captions. Native long copy plus native creatives beat an English description hiding under a translated gallery.