singlefax
Support Center
Get support for SingleFax - your all-in-one faxing solution. Find answers to common questions and learn how to contact our dedicated support team.
Contact Our Support Team
For personalized support or questions not covered below, please contact our dedicated team:
info@singlefax.comBring your existing fax number
Free port-in. Port-out costs $10 per number, or $150 for vanity numbers, paid upfront and refunded if the transfer fails.
Free port-in for eligible US/Canada local numbers on Standard or Business, monthly or annual, including HIPAA Secure. Lifetime and 30-day plans do not accept port-ins.
Porting details and eligibilityFrequently Asked Questions
SingleFax does not have access to your payment information at all. Payments are processed by Stripe, a secure payment processor used by millions of businesses worldwide. Your payment is sent directly to Stripe, and we never see your credit card information.
US, Canada, and Puerto Rico are pay on success. We place a temporary preauthorization hold and capture it only if the fax is delivered. If that delivery fails, we release the hold. Other destinations, and some high-cost US numbers, are charged when we send. That charge stays if delivery fails.
Yes! Send us an email at info@singlefax.com and we'll sort it out for you.
Please double-check the fax number before sending. Once a fax is successfully delivered, it cannot be recalled and telecom carrier fees are incurred, so we cannot refund deliveries to the wrong number. For US, Canada, and Puerto Rico, a failed delivery releases the preauthorization hold. For other destinations and some high-cost US numbers, the charge is taken when we send and stays if delivery fails.
We retry most sends up to 4 attempts over ~10 hours (immediately, then 1h / 3h / 6h). If the line is busy or nobody answers, we retry sooner: 5 minutes, then longer gaps, up to 15 attempts. Please check your email inbox for status updates and notify the recipient to check their fax machine. If the fax ultimately cannot be delivered, we release the preauthorization hold, you are only charged when the fax is successfully delivered.
US, Canada, and Puerto Rico faxes are pay on success: failed delivery releases the hold. Other destinations and some high-cost US numbers are charged when we send, and that charge stays if delivery fails. Delivered faxes are not refunded (wrong number or change of mind included). Fax numbers, plans, and EIN purchases have a 30-day money-back window from the dashboard. Full details are on our Refund Policy.
Browser extension
The free Chrome extension attaches a document and continues on SingleFax. It is not Secure Mode. Install it from the Chrome Web Store, or read the Chrome extension page.
- Supported: a file you choose (PDF, Word, Excel, PowerPoint, text, or image), or a public
https://…/*.pdftab that can be downloaded without signing in. - If Attach current PDF fails, download the file and use Choose a file, or upload on the website.
- Gmail, Drive, blob tabs, and file:// tabs are not captured. Download first.
- If Chrome denies or you revoke the SingleFax host permission, the transfer cannot upload. Reload the extension or choose the file on SingleFax.
- Local files can be up to 250 MB. Current-tab PDFs are capped at 50 MB. Expired transfers require attaching the PDF again.
- Do not attach medical records or other PHI. Open Secure Mode on SingleFax instead.
- To update or reinstall, remove the extension in Chrome and install the current listing. Copy the error code and extension version from a failed transfer when you write to info@singlefax.com — do not send the document, destination, or email in that report.
Key Information
Security
- • Bank-grade 256-bit SSL encryption for secure connections
- • Faxes stored securely and encrypted in your dashboard with option to delete anytime
- • Payments processed securely by Stripe
Limits & Policies
- • No hard page limits (contact us for massive documents of 200+ pages)
- • Up to 3 send attempts over 3 days if issues occur
- • US, Canada, and Puerto Rico: charged only when the fax is delivered
- • Other destinations and some high-cost US numbers: charged when we send
- • No refunds after successful delivery (wrong number / change of mind)
- • 30-day money-back on fax numbers, see Refund Policy
- • Free 24-hour numbers are recycled after a 3-day recovery window, leftover faxes may reach a later holder. Not for PHI. See free fax number
Business Hours
Support Availability
Our support team is available Monday through Friday, 9:00 AM to 5:00 PM EST.