Postcode Helper by SYNQ

About

Postcode Helper by SYNQ
  
  Change your Amazon delivery postcode in one click — across every Amazon marketplace.
  
  If you're an Amazon seller, agency, or marketer, you already know the drill: hop between amazon.com, amazon.de, amazon.co.uk, amazon.co.jp and the rest to check Buy Box behavior, localized pricing, delivery promises, or product
  availability. Each one needs a country-specific postcode. Remembering them all is impossible. Looking them up every time is slow.
  
  Postcode Helper fixes that. When you open Amazon's "Choose your location" dialog, a small panel appears above the postcode field with the top 5 cities for that country — pre-filled, validated, ready to click.
  
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  WHAT IT DOES
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  • Auto-detects which Amazon marketplace you're on (.com, .de, .fr, .co.uk, .it, .es, .se, .pl, .com.be, .com.tr, .co.jp, .com.au, .ca, .com.mx, .com.br, .in, .sa, .ae, .sg, .eg)
  • Shows 5 curated city + postcode chips, picked for the country
  • One click fills Amazon's postcode field — no typing, no copy-paste
  • Handles Canada's split FSA + LDU input format automatically
  • Add your own custom postcodes (per country), saved across your Chrome installs via chrome.storage.sync
  • Toolbar popup for managing your saved customs and as a fallback fill on tabs where auto-injection didn't catch the dialog
  
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  BUILT FOR
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  • Amazon sellers running on multiple marketplaces
  • Marketing managers checking localized ads, search results, and Buy Box
  • Agencies auditing client storefronts across regions
  • Anyone who tests Amazon UX in different countries
  
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  HOW IT WORKS
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  1. Click "Deliver to" in Amazon's header.
  2. The Postcode Helper panel appears above the postcode input.
  3. Pick a city. Done.
  
  Need a specific city not on the list? "+ Add custom" saves yours forever.
  
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  PRIVACY
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  • No tracking. No analytics. No automatic data collection.
  • Your custom postcodes are stored in chrome.storage.sync (synced across your own Chrome installs via your Google account; nothing leaves it).
  • The extension only runs on Amazon storefronts (see the marketplaces list above).
  • The only data that ever leaves your device is what you explicitly type into the optional "Share feedback / Report a bug" form (your message, and — if you choose to add them — your name, email, and a screenshot). It is sent to SYNQ so
  we can read and act on your feedback. Nothing is sent unless you fill in that form and click send.
  
  Full privacy policy: https://wearesynq.com/legal#privacy
  
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  ABOUT SYNQ
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  SYNQ is an advanced advertising agency helping US & European marketplace sellers dominate through performance marketing, data analytics, and cutting-edge tech. We're based in Berlin, Munich, and Barcelona.
  
  More from SYNQ:
  • SYNQ Amazon Tools (our flagship Chrome extension): https://chromewebstore.google.com/detail/SYNQ%20Amazon%20Tools/idnobhokapnhfpamifmfnfkcckchhjon
  • Amazon Ads Raw — YouTube channel: https://www.youtube.com/@AmazonAdsRaw
  • Free tools (ACOS calculator, LTV, N-Gram, bid optimizer, more): https://www.wearesynq.com/free-tools
  • Agency: https://www.wearesynq.com 
  
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  OPEN SOURCE
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  Source code and issue tracker:
  https://github.com/AlexWho3000/AmazonPostcodeHelper

  Bug reports and feature requests welcome.