Send a Fax Online with SingleFax
Pay per send from $0.99, or get a number to receive faxes. SingleFax is from the same team as BLAH! phone.
What is SingleFax?
SingleFax is an online fax service for sending a document once, holding a number for a few weeks, or keeping one on forms when you cannot predict when a reply will arrive. You see the quote before you pay.
It is built by the same team as BLAH! phone. Retail prices on this page match the SingleFax catalog. Destination adjustments may apply when provider cost is above the US/Canada baseline.
How to send a fax
Upload the original file, enter the destination number, and pay the quote. Domestic base is $0.99 for up to 10 billable pages, then about $0.08 per extra page, up to 100 pages. No account is required. Sends use a shared U.S. outbound number. If delivery fails, the preauthorization is released.
Accepted files: PDF, Word, Excel, PowerPoint, RTF, plain text, and images. Send the original — do not convert to PDF first.
| Billable pages | Example price |
|---|---|
| 1–10 | $0.99 |
| 11 | $1.07 |
| 20 | $1.79 |
| 50 | $4.19 |
| 100 | $8.19 |
How to receive a fax
A 30-day inbound number is $4.99 for 30 days. The first inbound fax is included. Extra inbound faxes are $4.99 each, any page count. You get a PDF by email plus a searchable transcript and key fields in the dashboard. Sending from that number is still retail from $0.99.
There is also a free 24-hour inbound number with a verified email. After 24 hours you have 7 days to keep the same number. The free plan includes 25 pages per 30 days; extra faxes are held at $4.99. You can keep the number at $4.99 / 30 days, $9.99/month, or $97 forever. The free number is not for PHI.
Receive a fax on SingleFaxOther products
These are for specific situations — a number on letterhead, regular monthly volume, or a particular IRS filing. Details and checkout are on SingleFax.
Lifetime inbound number
Useful when you publish a number on forms or letterhead and cannot predict when someone will reply. Basic is $97 with $15 starter inbound credit (about 3 faxes). Pro is $147 with extra credit and memorable / 888-style options. After the credit, inbound is $4.99 each. Credit does not expire.
Subscriptions (US/Canada dedicated number)
For regular send and receive volume on a dedicated US or Canadian number. Combined send + receive page pool; extra pages $0.05.
| Plan | Price | Pages / month |
|---|---|---|
| Standard | $9.99/month or $99/year | 300 |
| Business | $29.99/month or $299/year | 1,000 |
| HIPAA Secure add-on | +$20/month or +$200/year | Same pool |
HIPAA Secure is a website-only add-on (+$20/month or +$200/year) with an electronic BAA. It is for Covered Entities; see the PHI note below.
IRS filing products
Separate checkout flows for common fax-to-IRS jobs. Most are outbound-only unless noted.
| Product | Price | What it covers |
|---|---|---|
| EIN by Fax | $19.99 | SS-4 fill, IRS fax, 90-day return number |
| Form 5472 | $29.99 | Outbound-only; Form 7004 linked from the flow |
| Form 7004 | $4.99 | Extension filing |
| Form 2553 | $49 / $79 late | S-corp election, outbound only |
| Form 2848 | $14.99 | Wet-ink CAF power of attorney |
| Form 4506-T | $9.99 | Transcript request; IRS mails to the address of record |
Agents and API
SingleFax also publishes an MCP endpoint and developer API docs. PHI, EIN, and IRS filings stay on the website.
Privacy and protected health information
SingleFax uses SHA-256 SSL encryption for all connections. Payments are processed by Stripe — SingleFax never sees your payment information. No data selling, no ads, no branding on your faxes.
PHI is not available on MCP, MPP, or the public API. Covered Entities use HIPAA Secure Mode on the SingleFax website with an electronic BAA.
Common questions
How do I send a fax online?
On SingleFax, upload the original file (PDF, Word, Excel, PowerPoint, RTF, plain text, or image — do not convert to PDF first), enter the fax number, and pay the quote. Pay-per-send does not require an account. Sends use a shared U.S. outbound number. If delivery fails, the preauthorization is released.
How much does it cost to send a fax?
Domestic base is $0.99 for up to 10 billable pages, then about $0.08 per extra page, with a 100-page cap. Examples: 1–10 pages $0.99; 11 pages $1.07; 20 pages $1.79; 50 pages $4.19; 100 pages $8.19. Destination adjustments may apply; the quote is shown before payment.
How do I receive a fax with a temporary number?
A 30-day inbound number is $4.99 for 30 days. The first inbound fax is included; extra inbound faxes are $4.99 each, any page count. You get a PDF by email plus a searchable transcript and key fields in the dashboard. Sending on that number is still retail from $0.99.
How does the free 24-hour inbound fax number work?
A free inbound number is available with a verified email. It lasts 24 hours, then you have 7 days to keep the same number. The free plan includes 25 pages per 30 days; extra faxes are held at $4.99. You can keep the number at $4.99 / 30 days, $9.99/month, or $97 forever. It is not for PHI.
How do I keep a fax number for forms or letterhead?
If reply timing is unpredictable, SingleFax offers lifetime inbound numbers: Basic $97 with $15 starter inbound credit (about 3 faxes), or Pro $147 with extra credit and memorable / 888-style options. After the credit, inbound is $4.99 each. Credit does not expire. For regular monthly volume, US/Canada subscriptions start at $9.99/month (300 pages) or $29.99/month (1,000 pages).
How do I file an EIN or IRS form by fax?
SingleFax has separate products for common IRS fax jobs: EIN by Fax $19.99 (SS-4 fill, IRS fax, 90-day return number); Form 5472 $29.99 (outbound-only, with Form 7004 linked from the flow); Form 7004 $4.99; Form 2553 $49 or $79 late (S-corp election, outbound only); Form 2848 $14.99 (wet-ink CAF power of attorney); and Form 4506-T $9.99 (transcript request; IRS mails to the address of record). These stay on the SingleFax website.
Can I send a fax that includes medical or health information?
PHI is not available on MCP, MPP, or the public API. Covered Entities use HIPAA Secure Mode on the SingleFax website with an electronic BAA. The free 24-hour inbound number is not for PHI.
How do I send a fax from an agent or API?
SingleFax publishes an MCP endpoint at https://singlefax.com/mcp and developer API documentation on the SingleFax site. HIPAA, EIN, and IRS filings stay on the website.
Send or receive a fax
Visit SingleFax to send a document or get a number. Pay-per-send does not require an account.
Go to SingleFax.com