What Cipher does
Strip UTM
Removes utm_source, utm_medium, utm_campaign, utm_term, utm_content, utm_id and 7 more UTM variants — before the request even leaves your browser.
Strip ad clicks
Google (gclid, gbraid, wbraid, dclid, _gl), Microsoft (msclkid), Meta (fbclid), Yandex (yclid) and Bing — all stripped on click.
Strip social shares
X (twclid), TikTok (ttclid), LinkedIn (li_fat_id, trk), Instagram (igshid), Pinterest (epik), Reddit (rdt_cid), Snap (scid).
Strip CRM trackers
HubSpot, Mailchimp, Klaviyo, Marketo, Vero — newsletter links cleaned the moment you click them. Your inbox, your business.
Block analytics pixels
Google Analytics, Google Tag Manager, Facebook Pixel, Hotjar, Mixpanel, Segment, Amplitude, Heap, FullStory, Pendo, LogRocket, Mouseflow, CrazyEgg — never even loaded.
Block enterprise stacks
Adobe Analytics (Demdex, Everest, 2o7), Optimizely, VWO, HubSpot Analytics, Drift, Snowplow, Bing Ads, Yandex Metrika, Matomo Cloud, Marketo Munchkin, Tealium.
Per-site allowlist
Some affiliate links genuinely need their params. One click in the popup pauses Cipher for that hostname — locally, never synced.
Live counter
The toolbar badge shows how many tracking requests Cipher has cleaned today. We count rule matches; we never log URLs.
Zero permissions creep
No content scripts. No host scripting. No webRequest. Just Chrome's native declarativeNetRequest engine.
Why Cipher
Most tracker blockers download their rulelists from a server you don't control. That means the company behind them can change what gets blocked — or unblocked — without you noticing, and the extension calls home to do it.
Cipher takes the opposite approach. Every rule ships inside the extension package and is loaded by Chrome at install time. To change what Cipher blocks, we have to publish a new version — which you can read, line by line, on GitHub before it ever reaches your browser.
MIT-licensed, never obfuscated. The source repository at github.com/visionion/cipher contains every line of code that runs in your browser, including both DNR rule files.
Feedback & Support
Found a tracker we missed? A site Cipher breaks? An idea for the next version? We read every email and ship monthly rule updates.
Email info@visionion.dev