To use a proxy in Chrome, add Quantum Proxies Manager, our free extension, sign in with your QuanticData API key, pick the plan, the country and a sticky session, then turn the toggle on. The extension answers the proxy's username and password itself, so Chrome never asks. Below: every step, ISP and mobile plans, the check and the fixes.
Chrome has no proxy field of its own, and a proxy with a username and password needs something to answer its sign-in. A proxy extension does both: it sets the proxy for Chrome only, through Chrome's own extension API, and it hands over the credentials when the proxy asks for them. Quantum Proxies Manager is the extension we publish for this, under our QuantumProxies.io brand, and it signs in with the same API key as your QuanticData account. The field names below are the ones in the extension, version 1.2.0.
What you need
- Google Chrome on a computer, signed in to the Chrome profile you want to use with the proxy.
- A QuanticData proxy plan: Residential Premium, ISP or Mobile. The table further down says which one fits which job.
- Your API key. In the QuanticData dashboard open API Keys and click Copy key next to the key. It starts with
qd_live_and has 64 characters after that. - The extension: Quantum Proxies Manager on the Chrome Web Store. It is free; the proxy traffic comes from your plan.
Step by step: set up a proxy in Chrome
- Add the extension. Open Quantum Proxies Manager on the Chrome Web Store and choose Add to Chrome.
- Pin it. Click the puzzle icon at the right of the address bar and pin Quantum Proxies Manager, so its icon stays in the toolbar.
- Sign in. Click the icon, paste your API key into the key field and click Connect. If you are already signed in to the QuantumProxies.io dashboard in the same Chrome, the extension offers Continue as your email instead.
- Choose the plan. Proxy plan lists your active plans. Pick Residential Premium for most browsing; ISP and Mobile work the same way and are covered below.
- Choose the country. Under Geo-Targeting set Country. State / Region and City are optional: leave them on All unless a site needs a specific place.
- Choose the session. Under Session set Mode to Sticky and Hold for to the time you need, up to 60 min. Rotating gives a new IP on every connection, which suits scraping, not logins.
- Turn it on. The toggle at the top turns the proxy on. The status changes to Connected, the toolbar icon shows ON and the card shows the exit IP and its location.
- Check it. Open
ipinfo.io/jsonin a tab: the city, region and time zone should match the country you chose.
How the extension handles the proxy sign-in
Every QuanticData proxy asks for a username and a password, and the username carries the targeting: the country, the region or city and the session. When you turn the toggle on, the extension asks our API for a line on your plan with the settings you chose, sets it as Chrome's proxy and keeps the credentials. When the proxy answers that it wants a sign-in, Chrome hands the request to the extension, which replies with the username and password. That is why no sign-in box appears in Chrome while the extension is connected.
| What the extension does | In practice |
|---|---|
| Sets the proxy for Chrome only | Other apps on the computer are not affected; Chrome's incognito windows follow the regular ones |
| Answers the proxy sign-in | No prompt and no password typed in Chrome |
| Connects over HTTP | Chrome cannot send a username and password to a SOCKS5 proxy, so HTTP is the one that works with a login |
| Skips local names | localhost and host names without a dot, such as an intranet name, stay direct |
| Blocks WebRTC from showing your real IP | On by default while the proxy is active; Options, Privacy, WebRTC Leak Protection |
The SOCKS5 point is Chrome's, not the proxy's: Chromium's own documentation says no authentication methods are supported for SOCKSv5 in Chrome. Our plans offer SOCKS5 for tools that can log in to it; see SOCKS5 proxies.
Residential Premium in Chrome
Residential Premium gives home IPs in the country you pick, with State / Region and City when you need them. For anything with a login, use Sticky: the extension keeps one IP for the Hold for time you set, 1, 5, 10, 30 or 60 min. The Rotate button gets a fresh IP on the same plan and settings whenever you want one, and Rotating mode does it on every connection. The plans themselves are on the page for QuanticData residential proxies.
ISP proxies in Chrome
ISP plans are fixed addresses, so there is no country to pick in the extension: choose the plan in Proxy plan and turn it on. On an ISP plan with more than one IP, an IP Rotation card appears with Auto-rotate my dedicated IPs, Time-based or Per-request, every 10s up to 24 hours. Leave it off when an account should keep the same address, which is the reason to buy ISP proxies in the first place.
Mobile proxies in Chrome
Mobile plans add a Carrier / ISP field under the country, so the exit can be a specific mobile network. Use Sticky for an account session, as with Residential Premium. Mobile IPs are shared by many real phones on the same carrier, which is why sites that are strict with other IPs often accept them; more on mobile proxies.
| Plan | In the extension | Good for |
|---|---|---|
| Residential Premium | Country, State / Region, City; Sticky up to 60 min or Rotating | Most browsing and logins from a chosen country |
| ISP | No targeting, fixed IPs; optional auto-rotate when the plan has more than one | Accounts that should keep one address for months |
| Mobile | Country and Carrier / ISP; Sticky or Rotating | Phone-first platforms and sites strict with other IP types |
| Datacenter | Location of the gateway | Speed on sites that do not care about the IP type |
One country per Chrome profile
Chrome keeps extension proxy settings per profile. The extension's proxy applies to the profile it is installed in, so two profiles can leave from two countries at the same time: add Quantum Proxies Manager to each profile, sign in once in each, and pick a different country or a different sticky session in each. Two windows of the same profile always share one proxy.
Check that Chrome uses the proxy
Three checks, from quickest to most complete:
- The status card. Once connected it shows the exit IP, the country, the city and region, and the network.
- Test and Leaks. Test checks that the proxy responds. Leaks checks the exit IP, whether WebRTC exposes another address, and whether the computer's time zone matches the proxy's location.
- A tab.
ipinfo.io/jsonanswers through the proxy with the address and its location.
Our check for this guide, a Residential Premium sticky session with Country set to Canada on 23 October 2026:
| Field | Result |
|---|---|
| City | Caraquet |
| Region | New Brunswick |
| Country | CA |
| Time zone | America/Moncton |
| Network | AS855 Bell Canada |
Errors and fixes
The extension shows its messages at the top of the popup. These are the ones you can meet, and what each one means.
| What you see | Cause | Fix |
|---|---|---|
| Invalid API key format | Part of the key, or a space, was pasted | Copy key again in API Keys and paste the whole value: qd_live_ and 64 characters |
| Invalid API key | The key was rotated or deleted in the dashboard | Copy the current key from API Keys and sign in again |
| API key is disabled | The key was switched off | Enable it in API Keys |
| No active proxies in Proxy plan | The account has no active plan, or it has expired | Check My proxies in the dashboard: status and expiry date |
| You are out of bandwidth | The plan's traffic is used up | Add traffic to the plan, then pick it again |
| Test failed | The proxy did not answer the extension's test | Click Rotate for a fresh IP, or pick another country, then test again |
| Connected, but pages do not load or the IP does not change | Another proxy extension, or a policy set by your company, controls Chrome's proxy | Turn off other proxy extensions in Chrome's extensions page; on a managed computer, ask the administrator |
| Leaks shows Real IP exposed | WebRTC protection was turned off | Options, Privacy, WebRTC Leak Protection on |
One test outside the browser settles whether the plan itself works. Generate a sticky line in the dashboard, then run it with curl: if it returns an address in the right country, the plan is fine and the problem is in Chrome. More on using a proxy with curl, and on the meaning of a 407 Proxy Authentication Required answer.
curl -x http://residentialpremium.quantumproxies.io:8080 \
-U "USER-country-ca-sid-test-ttl-10m:PASS" https://ipinfo.io/jsonThe generator also keeps a session for up to 1440 minutes, for tools other than the extension. If curl fails too, run through the proxy not working checklist.
Before you run accounts
A proxy changes where Chrome's traffic comes from, not what you are allowed to do on a site. Keep to each platform's terms and to the law where you work, and give each account its own profile and its own sticky session.