UTM Link Builder — Campaign URL Generator for GA4 & Google Analytics

Real-world use cases

• Tag a product launch across 5 channels without copy-paste errors

  You're launching v2 on Monday and need the same landing page tracked on Twitter, LinkedIn, the newsletter, a WeChat post, and a paid Facebook ad. Type the base URL once, set utm_campaign=v2-launch-may, hit batch mode, and get 5 ready-to-paste links in 10 seconds. Each carries the right source/medium pair so GA4 splits the 5 channels into 5 clean rows instead of one mystery blob.

• Hand off a clean tracking link to a freelance designer for a poster

  The designer needs a QR code for a subway poster going to print Thursday. You set utm_medium=qrcode and utm_source=poster-subway-l1, scan the inline QR with your phone to confirm it resolves, then send the PNG. Three weeks later GA4 shows 412 scans from that exact placement, so you know the L1 line beat the bus shelter run.

• Audit a UTM link a teammate sent before it goes in a $2k ad

  A colleague pastes a tracking URL into Slack and asks you to approve it for a paid campaign. Drop it into reverse-parse mode: it pulls out utm_source=Facebook (capital F) and utm_medium=Social. You catch that GA4 would have created duplicate rows, fix both to lowercase, and save the campaign from fragmented reporting on a 2,000-dollar spend.

• Rebuild yesterday's newsletter link without retyping anything

  You sent a Tuesday newsletter and need the same link for Thursday's follow-up, just with utm_content swapped from header to footer. Open the history panel, the last 10 links are saved locally, click the Tuesday one to reload every field, change one value, and copy. No digging through old emails, no risk of a typo in the campaign name.

Common pitfalls

• Mixing case across links — `Facebook` on Monday and `facebook` on Tuesday become two sources in GA4. Lowercase everything; this builder won't auto-fix what you type.

• Putting the campaign name in utm_source instead of utm_campaign, so `summer-sale` shows as a traffic source. Source is where the click came from; the promo name goes in utm_campaign.

• Adding UTMs to internal links between your own pages — GA4 then resets the session and double-counts the visitor. Only tag external entry points like ads, emails, and social posts.

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