Complete fillable PDF forms in your browser

1 min read·25 July 2026

Tax forms, permit applications, government documents — many official PDFs are fillable. PDFrust lets you type into form fields directly in your browser, then save a completed PDF without installing anything.

What is a fillable PDF?

A fillable PDF contains interactive form fields: text boxes, checkboxes, radio buttons, and dropdowns. You can complete them digitally without printing. They typically appear with blue or yellow highlighted areas in a PDF viewer.

How to fill forms with PDFrust

Upload your PDF to the form fill tool. Fields are detected automatically. Click a field to start typing. Click checkboxes to toggle them. When finished, click "Save" — the output has your entries embedded as text in the document.

Fill PDF form

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Flatten to lock your entries

After filling, use the flatten tool to convert interactive fields to static text that cannot be edited further. Use this for the definitive version you submit — it prevents accidental editing by the recipient.

Fill and sign in one workflow

Combine form filling with signing: use the form fill tool first, then the sign tool to add your signature at the correct location. Submit a fully completed and signed document in one step.