Fill PDF Forms
Fill supported interactive PDF fields, then optionally flatten those fields into page content. Flattening does not make a PDF tamperproof or replace a digital signature. Free, private, in your browser.
Files processed in your browserSelect a PDF form or drag & drop
One PDF, up to 100 MB
Your files never leave your device. Fill PDF Forms runs entirely in your browser using JavaScript. Nothing is uploaded to a server. When you close this tab, your file is gone from memory.
How to fill pdf forms
- Select your form. Choose or drag in the PDF. Its fillable fields are detected and listed automatically.
- Fill it in. Type into text fields, tick checkboxes, pick from dropdowns and radio groups.
- Choose flattening. Optionally flatten supported interactive fields into page content; the page can still be edited with PDF software.
- Download. Press Fill form and download the completed PDF. Nothing is uploaded.
Want more detail? Read our full guide: How to fill out a PDF form.
Why fill PDF forms online?
Interactive PDF forms are everywhere official life happens: tax filings, visa and benefit applications, HR onboarding packs, medical intake sheets, insurance claims. They were built to be typed into, yet the everyday workflow often collapses back to paper: print the form, fill it by hand in cramped boxes, then scan it again into a heavier, uglier file. Even readers that do let you type have a habit of letting you enter everything and then gating the save behind a paid upgrade, so your work is trapped on screen.
This tool reads the form's own field definitions (the standard PDF AcroForm text boxes, checkboxes, radio groups, dropdowns and option lists) and lays them out as a clean list you simply work down. When you save, the field appearances are regenerated with your values, so your entries are drawn into the boxes where they belong rather than sitting at the wrong size or offset. Where a form sets its own fixed font size and your answer is longer than the box can show at that size, the overflow is clipped on the page, and the tool tells you which fields are affected instead of letting you find out after you have sent it.
You can optionally flatten supported interactive fields after filling. This removes those fields and places their appearances into page content, but it does not make the PDF tamperproof, replace a digital signature, or guarantee that every PDF feature is flattened. It is also the point where any clipped overflow becomes permanent, because the stored field value goes with the field. Keep an original and validate the output before an official submission. If the tool reports no fields, the file is a flat scan or printed layout; use Add Text instead.
Think about what a filled form actually contains: your name, address, date of birth, income, national ID or social security number, medical history. That is precisely the data you should be most reluctant to hand to an unknown web server. Here the form is parsed, filled and saved entirely within your browser, so those details are only ever written into the file on your own device and go nowhere else.
Frequently asked questions
Are my files uploaded?
No. The form is read, filled and saved entirely in your browser, which matters, since forms tend to hold exactly the data you least want to upload.
Why can't I type into my PDF?
Most likely it has no form fields: it's a scan or a printed layout saved as PDF, so there's nothing for a reader to fill. This tool will tell you, and for flat forms you can use Add Text to type directly onto the page instead.
What does flattening do?
It removes supported interactive form fields and places their appearances into the page content. Those fields are no longer interactive, but the page is not tamperproof or a security feature, and it does not safely handle signatures. Keep an unflattened copy and validate the output before submitting.
Which field types are supported?
Text fields, checkboxes, radio groups, dropdowns and option lists: the standard PDF (AcroForm) field types. Signatures you draw by hand can be added with the Sign PDF tool afterwards.
Will my entries look right when printed?
The tool regenerates supported field appearances with your values, but PDF viewers can differ. Review the saved file and print or submit a test copy when appearance matters.
What if my answer is too long for the box?
It depends on the form. Many forms let the box size its own text, and the text shrinks to fit however much you type. Where a form fixes its font size instead, anything longer than the box can show is clipped on the page, so the tool warns you and names the fields. Without flattening, the full value is still stored in the field and your PDF reader shows it when you click in, so shorten it only if the printed copy has to show everything. Flattening keeps just the visible page content, so the clipped part is lost for good.