Sejda PDF

PDF forms

Fill in fields - or make a flat document fillable.

Drag & drop your files here

Supported: PDF

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About PDF forms

Complete existing interactive forms in the browser, or turn a printed-looking PDF into a real form by adding text boxes, checkboxes and dropdowns that anyone can fill in later.

  • Text, checkbox, radio and dropdown fields
  • Fill existing AcroForms
  • Export flattened or still fillable

How to pdf forms

  1. 1

    Open the form

    Existing fields are detected and highlighted.

  2. 2

    Fill or add fields

    Type into fields, or draw new ones where they are missing.

  3. 3

    Save

    Export a filled copy, or a reusable fillable template.

A practical guide to pdf forms

Filling a form that already has fields

Many PDFs are built as interactive AcroForms, with real text boxes, checkboxes, radio buttons and dropdowns waiting for input. When one of these opens, the fields light up and you simply tab through them, typing or clicking as you go. This is the fast path: no drawing, no guessing, just completing what the author already laid out. If a required field is empty, the form tells you before you finish. When you are done, export a filled copy to send on, and decide whether to keep it editable or flatten it so the answers are locked in.

Turning a flat or scanned page into a real form

Plenty of documents look like forms but have no live fields at all, a scanned application, a printout saved to PDF, a template someone drew in a word processor. Here you build the form yourself by drawing text boxes, checkboxes, radio groups and dropdowns directly over the blanks. Line each field up with its printed label and size it to match the space so the finished form looks intentional rather than patched. Once the fields are in place, the document behaves exactly like a native form for everyone who fills it afterward.

Distributing and collecting completed forms

How you export depends on what happens next. If you are sending the form out to be completed, keep the fields live so recipients can type into them in any reader, and consider marking the essential ones as required so nothing comes back half-finished. If you are the one filling it and returning it, flatten on export so your entries cannot be altered downstream. For a form you will reuse, save the empty fillable version as a template so you never have to rebuild the fields, and only flatten the individual copies as they are completed.

Frequently asked questions

How do I know if a PDF already has real form fields?
Open it here and any existing interactive fields are detected and highlighted for you to type into. If nothing highlights and you are just clicking dead text, the document is flat and has no real fields, so you would add them yourself where the blanks are.
Can values from one field fill another automatically?
Give two fields the same name and they mirror each other, so a name typed once appears wherever that field repeats, which is handy for a signature block or a header that recurs on every page. Checkboxes and radio groups use shared names the same way.
The person I send it to has no special software. Can they still fill it?
Yes. Fields you add are standard PDF form fields, so anyone can complete them in an ordinary reader or browser and send the filled copy back. Nothing needs to be installed, and they do not need an account.
How do I stop people from editing my answers after I fill a form?
Export with the form flattened. That converts your typed entries into fixed page content so they can no longer be changed or accidentally cleared. Keep the still-fillable version for yourself in case you need to update an answer later.

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