# How to Sign a Form and Fax It from Your iPhone Sign a PDF on your iPhone with FaxUp's Fill & Sign and fax it in one go, and know when the office needs a pen signature on paper instead (the IRS does for some forms). By [Dan Bayer](https://faxup.net/about) · Last updated: November 12, 2026 **To sign a form and fax it from an iPhone, open it in the FaxUp app, tap Fill & Sign to type and draw your signature, then enter the fax number and send.** Check first whether the recipient accepts an electronic signature: the IRS doesn't for Forms 2848 and 8821 by fax. Filling in a form, signing it and faxing it used to mean a printer, a pen and a fax machine. On an iPhone it can be one flow in one app. The only real question is whether the office on the other end accepts a signature drawn on a screen. ## Sign and fax in the FaxUp app 1. Open the form in FaxUp: share the PDF to FaxUp from Mail or Files, pick it from inside the app, or scan the paper with the app's scanner. 2. Tap **Fill & Sign**. 3. Tap where text goes and type: name, address, account number. Add **today's date** where the form asks for it. 4. Add your **signature**: draw it with your finger and put it on the signature line. 5. Check every page. Zoom in on the signature line: on a fax, a thin, light signature can break up. 6. Enter the fax number, add a cover page if needed, and send. ## Sign in Safari, then fax Prefer not to install anything? The free [fill and sign PDF](https://faxup.net/sign-pdf) tool works in Safari. It runs in your browser, so the PDF stays on your phone while you work on it. When you are done, send the signed PDF to [faxup.net/send](https://faxup.net/send). ## When a drawn signature isn't enough Some recipients require an ink signature on paper for a faxed form. The clearest example is the IRS: the instructions for Form 2848 (power of attorney) and Form 8821 (tax information authorization) say that by mail or fax the signature must be handwritten, and that digital, electronic or typed signatures are only accepted when the form is submitted online. For a form like that: 1. Fill in the text on your phone if you like, then print it, or print the blank form and fill it by hand. 2. **Sign it with a pen.** Black or dark blue ink. 3. **Scan the signed page** with the FaxUp app's scanner or the free [phone document scanner](https://faxup.net/scan). 4. Fax the scan. The numbers for IRS forms are in [faxing the IRS from your phone](https://faxup.net/fax-to-irs). For other forms, look for a signature section in the instructions. If they don't say, and the document is important, ask the office whether an electronic signature is acceptable before you send. ## Make the signature survive the fax A fax prints in black and white at about 200 lines per inch. To keep a signature legible: - Draw it larger rather than smaller, and with a steady stroke. - Keep it inside the signature box, away from the page edge: fax machines can lose a strip at the edges and print a header across the top. - For a pen signature, use dark ink and scan in good light. - Run the final PDF through the [fax preview](https://faxup.net/fax-preview) to see the printed result. ## Keep a copy and the proof Save the signed PDF. With email notifications on in the FaxUp app, a delivered fax also brings a transmission report PDF with the number, page count, time and a transmission reference. See [fax confirmation reports](https://faxup.net/fax-confirmation). Ready to send it? One fax is $2.99, any number of pages, with no subscription. You see every page as it will print before it goes, and a fax that can't be delivered gives its credit back. [Send a fax for $2.99](https://faxup.net/send)[Fill & sign PDF (free) →](https://faxup.net/sign-pdf) Type, date and sign a PDF in Safari. Nothing is uploaded until you choose to fax it. ## Questions ### Is a signature drawn on my iPhone valid on a faxed form? It depends on who receives it. Many offices accept it; some don't. The IRS, for example, says Forms 2848 and 8821 sent by fax must have a handwritten signature, and accepts electronic signatures on those forms only when they are submitted online. When in doubt, read the form's signature instructions or ask the office. ### How do I fax a form I signed with a pen? Scan it. The FaxUp app's scanner, or the free phone document scanner at faxup.net/scan, crops to the page and raises the contrast so the ink signature prints clearly. ### Does FaxUp keep my signature? The free fill and sign tool on faxup.net runs in your browser: the PDF and signature stay on your device until you choose to fax the result. ### Can I add today's date and type my name? Yes. Fill & Sign in the app adds text, today's date and your signature to any page. The web tool does the same in Safari. ### What does it cost to fax the signed form? $2.99 for one fax of any length, no subscription. One page to the US or Canada can go free with your email at faxup.net/free-fax. ## Related guides - [Fax the IRS from your phoneIRS fax numbers for Forms 2848, 8821, SS-4, 4506-T, 2553, 8857, 14039, 15227 and 911, checked on irs.gov, plus the signature rule that gets phone-signed forms rejected.](https://faxup.net/fax-to-irs) - [Fax an email attachmentGot a form by email and the office wants it by fax? Send the attachment from iPhone Mail or Gmail straight to the FaxUp app or faxup.net, without printing it.](https://faxup.net/fax-email-attachment-from-iphone) - [Fax a PDF from the Files appFax a PDF or Word file saved in Files, iCloud Drive, Google Drive or Dropbox from your iPhone: share it to the FaxUp app, or pick it in Safari at faxup.net. No printing.](https://faxup.net/fax-pdf-from-iphone-files) - [Fax confirmation and proof of deliveryWhat a fax transmission report shows, how to get FaxUp's delivery report PDF on your iPhone or Android phone, and what it does and doesn't prove when an office says it never got your fax.](https://faxup.net/fax-confirmation) ## Sources - [IRS: Instructions for Form 2848 (handwritten signature required by mail or fax)](https://www.irs.gov/instructions/i2848) - [IRS: Instructions for Form 8821 (handwritten signature required by mail or fax)](https://www.irs.gov/instructions/i8821) - [Apple App Store: FaxUp (Fill & Sign: signature, text and today's date)](https://apps.apple.com/app/faxup-send-fax-from-phone/id6477722416) - [FaxUp fill and sign PDF tool](https://faxup.net/sign-pdf) Outside sources were checked on November 12, 2026. Something wrong or out of date? Email [support@faxup.net](mailto:support@faxup.net). --- Source: https://faxup.net/sign-and-fax-from-iphone (Markdown copy of the page; the HTML page is canonical).