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Fathom Analytics Blocked by Ad Blockers

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Ongoing Web Updated November 13, 2026Based on 3 user reportsHow we research

Quick answer

Many blocklists block Fathom's cdn.usefathom.com script, and Fathom removed custom domains in March 2023 because blockers caught them too. There is no official bypass; existing custom domains still work, and some developers proxy the script themselves at their own risk.

Most likely fix: Measure how much is blocked

How to fix it

Try these in order — the most common fix is first.

  1. 1. Measure how much is blocked

    1. Open your site with uBlock Origin or Brave Shields on and check DevTools > Network for the blocked script
    2. Compare Fathom totals with server logs or your CDN's request stats to estimate the gap
    Did this fix it?

  2. 2. Keep an existing custom domain

    1. If you set up a custom domain before March 2023, don't remove it from your embed code
    2. Fathom says existing custom domains keep collecting data even though they no longer appear in settings
    Did this fix it?

  3. 3. Use UTMs and server-side numbers for key campaigns

    1. Tag links you control with UTM parameters so campaign attribution survives missing referrers
    2. Track critical conversions (signups, purchases) in your backend as well, since blocked visitors never send events
    Did this fix it?

Symptoms

Fathom counts noticeably fewer visitors than server logs or other tools, especially on developer or tech-savvy audiences; the script shows as blocked in DevTools with uBlock enabled.

Why it happens

  • cdn.usefathom.com is on common blocklists
  • Custom domains are no longer offered (March 2023)
  • Strict browser privacy modes and extensions block third-party analytics

This guide also covers

  • fathom analytics ad blocker
  • fathom blocked by ublock
  • fathom custom domain
  • fathom analytics proxy

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