Articles on: Troubleshooting

Can't add card or pay? Stripe payment form not loading (js.stripe.com/v3 blocked)

Symptoms this article covers: "Add card" or "Change payment method" shows an endless spinner; the Stripe form is blank; you see "We couldn't load the payment form"; browser shows ERR_INTERNET_DISCONNECTED on https://js.stripe.com/v3/; you can sign in fine but can't pay or upgrade; works on your phone but not on your computer.

Almost every "payment won't load" report is the same thing: your browser can't reach https://js.stripe.com/v3/ - the specific Stripe SDK URL SimplyPrint loads. SimplyPrint uses Stripe for all payments, and js.stripe.com/v3 is a common target for ad-blockers, antivirus, and corporate firewalls.

5-second test

Open this URL in a new tab in the same browser: https://js.stripe.com/v3/

You see a wall of JavaScript: Stripe is reachable. Hard-refresh SimplyPrint (Ctrl + Shift + R / Cmd + Shift + R) and try again.
You see "This site can't be reached" or "ERR_INTERNET_DISCONNECTED": Stripe is blocked. Continue below.

What blocks Stripe

Aggressive ad-blockers (uBlock Origin with custom filters, Privacy Badger, NoScript)
Antivirus HTTPS scanning (Kaspersky, Avast, AVG, Bitdefender)
VPNs with ad-blocking tiers (NordVPN, Surfshark, Proton)
Pi-hole, AdGuard Home, NextDNS with aggressive blocklists
Corporate firewalls that whitelist a small set of "approved" domains
School / enterprise networks that block payment traffic by policy

What to do (in order)

1. Hard refresh

Ctrl + Shift + R / Cmd + Shift + R. Often fixes a half-loaded form.

2. Incognito with extensions OFF

In Chrome, extensions are NOT auto-disabled in incognito - you must check each one. If the form loads in incognito with extensions off, see Browser extensions blocking SimplyPrint.

3. Try another browser

Chrome, Firefox, Edge. Works in another browser = browser-specific setting, extension, or profile corruption in your usual one.

4. Update your card from your phone (the easiest workaround)

This is the practical fallback. If js.stripe.com/v3 is blocked specifically on your computer (antivirus, VPN, corporate firewall), your phone on mobile data is on a completely different network.

Open simplyprint.io/panel on your phone.
Sign in.
Add or update your card.
Once saved, you can continue using everything else on your computer.

5. Allowlist Stripe in your antivirus / firewall

If you control your network or antivirus, allow these Stripe domains:

For corporate networks: your IT department needs to allow these. We can't bypass it - Stripe loads directly in your browser, not through our servers, and Stripe forbids us from proxying.

6. Use invoiced payments instead (Print Farm, School, Enterprise)

If Stripe is permanently blocked for policy reasons on your network, switch to invoiced payments / bank transfers instead. No Stripe involved.

After the form loads

How SimplyPrint billing works (payment methods, currencies, invoices)
Subscription payment method fees (PSD2) - if you see PSD2 / 3-D-Secure pop-ups
Subscription terminated after failed renewal - if the load failure caused a missed renewal

Updated on: 25/05/2026

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