Fill out a W-9, W-4 or I-9 online
Press a button and the agency’s own PDF opens in your browser, ready to type into. There is nothing to download first, and what you type is never uploaded.
Choose a form
The forms are free from the agencies. Filling one in here costs $1.99, paid once when you download, and that payment covers every download for 24 hours.
Form W-9
Rev. March 2024, from the IRS
Gives your taxpayer identification number to a business that pays you.
Form W-4 (2026)
2026, from the IRS
Tells your employer how much federal income tax to withhold from your pay.
Form I-9
Edition 01/20/25, from USCIS
Shows your employer that you may work in the United States.
Practice form
Made up, for trying the editor
A three-page sample form with blank lines and tick boxes, for trying the editor.
Which revision you get
Each file is a copy of the PDF on the agency’s own website. Here is the revision printed on each form, where the file came from, and the date we last compared it with the agency’s site.
| Form | Revision | From | Last checked |
|---|---|---|---|
| Form W-9, Request for Taxpayer Identification Number and Certification | Rev. March 2024 | irs.gov | November 12, 2026 |
| Form W-4 (2026), Employee’s Withholding Certificate | 2026 | irs.gov | November 12, 2026 |
| Form I-9, Employment Eligibility Verification | Edition 01/20/25 | uscis.gov | November 12, 2026 |
FairFill PDF is not part of the IRS, USCIS or any government agency, and the agencies don’t endorse it. If your employer or payer gave you a different revision, open that file instead: fill out any PDF form.
How it works
- Press the button for your form. It opens in the editor with its boxes shown in pale blue.
- Click a box and type. Tick the checkboxes that apply to you.
- For what goes on each line, and whether to sign on screen or on paper, follow the steps for your form: W-9, W-4 or I-9.
- Press Download, then “Pay $1.99 and download”. After you pay on Stripe’s card page, press “Save your PDF”.
- Give the finished form to whoever asked you for it. We don’t send it anywhere.
Another form
Any other fillable PDF works the same way. Download it from the agency’s own website, then open it here. For a paper form, take a photo, turn the photo into a PDF, and press Find blanks to get typing boxes on its blank lines.
Questions
Are these the official forms?
Yes. Each one is the agency's own PDF, copied from irs.gov or uscis.gov. The table on this page lists the revision printed on the form and the date we last compared the file with the agency's site.
Are the forms free?
The forms are free from the agencies' websites. The $1.99 is for filling in and signing in this editor, and you pay it only when you download.
Do you send my form to the IRS or to my employer?
No. Your form never leaves your device. You download the PDF and give it to whoever asked you for it.
Is what I type kept private?
What you type stays on your device: in this browser while you work, and in the PDF you download. It is never sent to us.
Can I stop and finish later?
Yes. Your work stays in this browser for 24 hours after your last change. Open the editor again in the same browser to carry on.
What if I need a different revision?
Download that revision from the agency's website, then open the file here. Any fillable PDF opens the same way.
Have your own PDF? Open it. You see the price before you start.
Open a PDF