pdfcdf
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Fill & Sign

Fill the interactive form fields in a PDF, then optionally flatten it.

Drop a PDF form to fill

or browse your device

PDF with form fields

How to fill out a PDF form

Fill in the interactive fields of a PDF form — text boxes, checkboxes and dropdowns — then optionally flatten it so the answers are locked in. No printing required.

  1. 1Open the Fill & Sign tool and upload a PDF with form fields.
  2. 2Type into the fields and set any checkboxes or dropdowns.
  3. 3Choose whether to lock (flatten) it, then click “Fill & download”.
Read the full Fill & Sign guide →

Frequently asked questions

My PDF has no fillable fields — what do I do?
Fill & Sign works with interactive AcroForm fields. If your PDF is just a flat page, use the Sign PDF tool to place text and a signature anywhere.
Is pdfcdf free to use?
Yes. Every tool on pdfcdf is completely free, with no account, no watermarks, and no limits on how many files you process.
Are my files safe? Do they get uploaded?
Your files never leave your device. Every tool runs entirely in your browser, so your documents are processed locally and are never uploaded to a server or seen by anyone.
Do I need to create an account or sign up?
No. pdfcdf works instantly with no sign-up, no email, and no software to install — just open the tool and go.
Does it work on mobile phones and tablets?
Yes. pdfcdf runs in any modern browser on phones, tablets, Mac, Windows and Linux — nothing to download.

Related tools

Sign PDFFlatten PDFWatermark