How to fill and sign a PDF

Interactive form fields vs flat PDFs

PDF forms come in two varieties. "Fillable" PDFs have interactive form fields created with PDF form authoring tools — you can click into them and type. "Flat" PDFs are either scanned paper forms or print-layout documents with no interactive layer at all.

You can complete either kind in the browser signer by placing typed text and a signature directly on the page. This approach works for fillable forms and flat scans equally, because you are placing content on the document surface rather than relying on the underlying field structure.

When you complete and download the form this way, everything is flattened into the final document. The recipient sees your entries and signature exactly as placed, with no empty interactive fields left behind and no way to modify the entries after the fact.

Completing a flat scan or print-only form

Many government forms, medical intake forms, and older institutional forms are distributed as scans or as print-only PDFs. They have printed lines with labels — "Full Name:", "Date of Birth:", "Signature:" — but no interactive fields. Completing them digitally used to require printing, filling by hand, and scanning back in.

With a browser signer, you place text boxes anywhere on the page, type your entries, and position a signature exactly where required. The result is a clean, fully digital, completed form that looks exactly as if it had been filled in by hand — often cleaner, since typed text is more legible than handwriting.

Tips for a clean, professional result

A few small details make a completed form look right rather than ad hoc. Match the text size to the surrounding print — most printed forms use text around 9–11 points, so sizing your typed entries similarly makes them blend naturally. Align each entry to the baseline of the printed line rather than centered vertically in the field space.

Check every page before downloading. Forms often have a checkbox on the last page, a date next to the final signature, or a "print name" field just below the signature line that is easy to overlook. A quick scroll through the complete document before export prevents having to redo it.

• >Match your text size to the surrounding print (typically 9–11 pt for most forms).
• >Align entries to the baseline of each line rather than floating above it.
• >Add the date in the format the document specifies (MM/DD/YYYY is standard in the US).
• >Check for initials required on other pages before downloading.
• >Review every page in the preview before exporting the final file.

Handling checkboxes and multiple-choice fields

Checkboxes and radio buttons on flat PDF forms are printed marks, not interactive elements. To indicate a selection, place a text element with a check mark character (✓ or ✗) inside the printed checkbox area, or use a small drawn "x" positioned to sit within the box.

For radio buttons (circles where you choose one option), position a small filled circle or a typed dot in the center of the appropriate circle. Zoom in to get accurate placement before finalizing.

Your form data stays private

Forms frequently contain the most sensitive personal data you will ever put in a document — addresses, Social Security or national ID numbers, financial details, medical information, employment history. Because the document is processed in your browser using WebAssembly and never uploaded, all of that information stays on your device.

This is a meaningful distinction compared to most online form-filling tools, which upload your document to a server to process it. The browser-local approach means there is no server-side copy of your form data to be breached, retained, or shared with third parties.

When to use a fillable PDF editor instead

If the form has complex interactive fields — dropdown menus, calculated fields, conditional logic, or fields that require specific PDF form input — a dedicated PDF editor with full form support may handle it more reliably. Tools like Adobe Acrobat Reader (free) can interact directly with interactive form fields when the PDF was built to include them.

For straightforward forms where you are placing text and a signature on the page, the browser signer approach works well for the overwhelming majority of cases.

Common forms you can fill and sign in the browser

Virtually any standard form distributed as a PDF can be completed this way, including:

• >Employment applications and new-hire paperwork (W-4, I-9 in the US).
• >Rental applications and lease agreements.
• >Medical intake and consent forms.
• >Bank account and financial service forms.
• >Government applications and permit forms.
• >Contractor agreements and freelance contracts.
• >Insurance forms and claims documents.

Sending the completed form

After downloading the filled and signed PDF, attach it to an email reply or upload it to the portal or system that originally sent it to you. The file is a standard PDF — there is nothing special about the format and no software requirement on the recipient's end.

If the form needs to go to a government office or institution by a specific date, download and send it promptly. Keep a copy in your own records along with any confirmation of receipt.