> For the complete documentation index, see [llms.txt](https://docs.helodata.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.helodata.com/integrations/antidetect-browsers/multilogin.md).

# Multilogin

Multilogin is the most fingerprint-fidelity-focused option among antidetect browsers. Its proxy support covers all helodata products.

## Per-profile setup

1. **New profile** → **Proxy** section.
2. **Connection type**: HTTP or SOCKS5.
3. Fill in:

### Residential / Mobile (gateway)

| Field    | Value                                                            |
| -------- | ---------------------------------------------------------------- |
| Host     | `gate.helodata.io`                                               |
| Port     | `7777`                                                           |
| Login    | `helo_s1a2b3c4d5e-type-res-region-us-session-prof01-sesstime-30` |
| Password | sub-user password                                                |

### ISP

| Field    | Value              |
| -------- | ------------------ |
| Host     | `198.51.100.42`    |
| Port     | `8000`             |
| Login    | `helo_s1a2b3c4d5e` |
| Password | sub-user password  |

4. Click **Check proxy** — Multilogin probes and shows the exit IP, country, and timezone.
5. Multilogin will offer to **auto-match fingerprint** to the proxy's country. Accept it.

\[screenshot: Multilogin profile creation with helodata proxy]

## Bulk via API

Multilogin's Local API can create profiles programmatically — useful for spinning up N profiles, each bound to one ISP IP:

```bash
curl -X POST http://127.0.0.1:35000/api/v1/profile \
  -H "Content-Type: application/json" \
  -d '{
    "name": "isp-us-042",
    "os_type": "windows",
    "proxy": {
      "type": "http",
      "host": "198.51.100.42",
      "port": 8000,
      "username": "helo_s1a2b3c4d5e",
      "password": "PASSWORD"
    }
  }'
```

Loop over your ISP list to provision profiles in seconds.

## Fingerprint match

Multilogin's strength is matching the browser fingerprint to the proxy's locale. Enable **Match fingerprint to proxy country**:

* Language headers align with the country
* Timezone derives from the proxy IP
* WebGL / Canvas fingerprints are randomized within country norms

## Verify

Hit `https://browserleaks.com/ip` + `https://browserleaks.com/javascript` and check IP, timezone, navigator.language all align.

## Common pitfalls

* **`MultiloginProxyError: AUTHENTICATION_FAILED`** — gateway products require the full username (`helo_...-type-res-region-us`), not just `helo_s1a2b3c4d5e`.
* **Profile launched before proxy check** — Multilogin will sometimes hold a stale proxy in memory; restart the profile after editing.


---

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