# _hsenc — HubSpot's encoded engagement parameter

- Canonical: https://linkclean.app/trackers/hsenc/
- Updated: 2026-07-20
- Author: Ken Tominaga (https://ken0nek.com)
- Get the app: https://apps.apple.com/us/app/linkclean/id6758604043

Parameter: `_hsenc` · Category: Email marketing · Vendor: HubSpot

> _hsenc is **HubSpot's encoded engagement parameter** — joins email clicks back to a specific contact record in HubSpot's CRM. Companion to _hsmi (the email's message ID). Same identity-bound risk as Mailchimp's mc_eid or Marketo's mkt_tok.

## What _hsenc and _hsmi do together

HubSpot tags every outbound link in a HubSpot-sent email with two parameters: _hsenc (the encoded engagement token — per-recipient, identity-bound on HubSpot's side) and _hsmi (the message ID — names which specific email send the link came from). Both feed HubSpot's contact-engagement scoring.

_hsenc joins a click back to your contact record in HubSpot's CRM. Forwarding it has the same blast radius as forwarding mkt_tok: another person's click gets attributed to you, and HubSpot picks up a join key tying that pageview back to your email address.

## How LinkClean removes them

Both _hsenc and _hsmi ship default-on in LinkClean's email-marketing catalog.

## Example

Looks like this in a URL: `https://example.com/article?_hsenc=p2ANqtz-_aB_cD_eF_gH_iJ_kL_mN&_hsmi=89123456`

After LinkClean: `https://example.com/article`

## Frequently asked

**Is _hsenc the same as _hsmi?**

No. _hsenc is per-recipient (identity-bound, like mc_eid); _hsmi is per-message (names which email send). Both ride along on HubSpot links.

**Why is _hsenc on every HubSpot link?**

HubSpot uses it to score contact engagement — which contacts opened, which clicked, which converted. _hsenc is the join key.

**Is _hsenc personal data?**

Yes. It identifies the specific HubSpot contact the email was sent to. Functionally identity-linked.


---

LinkClean removes tracking parameters from links on-device — free to clean, one-time Pro. https://linkclean.app/ · Cite freely with attribution.