How to fill out a PDF form and save it
Quick answer: To fill out a PDF form and save it, open the form in a PDF editor like Quick PDF, tap each box and type your answers (use Add text where there are no boxes), tick checkboxes and pick dropdown options, add your signature, then download the file. Choose Flatten form to lock the answers into the page, or keep it fillable to edit later.
Sign in with Google or email and start editing. Saving your file starts a free trial: 7 days on yearly ($29.78/yr) or 2 days on monthly ($2.99/mo). Cancel anytime. 🔒 Your file stays on your device.
Few things are more frustrating than typing a whole form, closing the file, and finding every answer gone. It happens because many PDF viewers let you type into a form without actually saving what you typed.
This guide shows how to fill out any PDF form, fillable or not, and save a copy that keeps your answers, on a phone or computer. It also explains why forms sometimes refuse to save and how to fix each case.
Fill out a PDF form and save it with Quick PDF
- Open the form in Quick PDF Go to quickpdfapp.com, sign in, and open the PDF form from your Files, Downloads or desktop.
- Fill in the fields Tap each box and type. Tick checkboxes, choose radio buttons and pick options from dropdowns.
- Type where there are no boxes If a line or space is not clickable, use Add text, tap on the line and type. Change size and font so it fits.
- Sign and date if required Use Sign to place your signature and Add text for the date.
- Choose how to save Tap Download and pick Flatten form to make answers part of the page, or keep it fillable if you or someone else needs to edit it.
- Open the saved file to check Open the downloaded PDF once to confirm every answer is there before you send it.
Fillable vs non-fillable forms
A fillable form has built-in fields: when you tap a box, a cursor appears and you can type. Checkboxes, radio buttons and dropdowns work by tapping. Quick PDF's Fill PDF form tool handles all of these.
A non-fillable (flat) form is just a picture of a form, or a scan. Nothing happens when you tap a box. That is normal, and you can still fill it: use Add text to tap anywhere and type, choosing Sans, Serif or Mono, a size and a colour so it matches the form. For checkboxes, type an X. Step by step: how to fill out a non-fillable PDF.
Many real-world forms are a mix: some fields work, some do not. Use the fields where they exist and Add text for the rest.
Why your filled PDF did not save (and how to fix it)
| What happened | Why | Fix |
|---|---|---|
| Answers vanished after closing | The viewer let you type but you closed it without saving a new copy | Fill it in an editor and download the filled copy |
| Saved file opens blank on another device | Some viewers do not show form field values the same way | Download with Flatten form so answers are part of the page |
| Form says "Please wait" or will not display | It is an older interactive form type built for Adobe Reader (often called XFA) | Ask the sender for a standard PDF version, or open it in Adobe Reader as instructed |
| Fields are locked or greyed out | The creator restricted editing, or the form was already flattened | Use Add text on top, or ask the sender for an editable copy |
| You sent the original, not the filled one | Both files have similar names | Rename the filled copy and check before sending |
More fixes are in why can't I edit my PDF.
Flatten or keep fillable: which to choose?
When you download a filled form in Quick PDF you can choose Flatten form. Here is how to decide:
- Flatten when you are sending the form to someone else (an employer, landlord, school or office). Answers become part of the page, look the same in every viewer, and cannot be changed by accident.
- Keep it fillable when you will update the form later, or when the recipient asked for an editable PDF they can process.
Tip: download a fillable copy for yourself and a flattened copy to send. Read more in how to flatten a PDF.
Filling forms on a phone
- iPhone: save the form to the Files app, open quickpdfapp.com in Safari and open the form. Pinch to zoom on small boxes. See fill out a PDF on iPhone.
- Android: forms you download are usually in Downloads. Turn the phone sideways for larger fields.
- Both: the keyboard can cover the field you are typing in; scroll the page up a little to see it.
You can add Quick PDF to your home screen like an app, so forms open in a tap next time.
Other ways to fill a PDF form
Built-in tools can fill simple forms too. Chrome and Microsoft Edge can type into fillable fields and download a copy; on Mac, Preview fills forms and can add text; on iPhone, Markup can add text and a signature. These work well for quick, simple forms.
Quick PDF helps when a form needs more: flat forms that need typed text, a signature, a date, a photo with Image, a mistake corrected with Edit text, or a flattened final copy, all with the same steps on phone and computer. Your form is opened and processed in your browser and stays on your device.
Tips for neat, accepted forms
- Use black or dark blue text, and a size that fits the box without touching the lines.
- Write dates and numbers in the format the form shows (for example MM/DD/YYYY).
- Do not leave required fields empty; write "N/A" where something does not apply, if the form allows it.
- For forms with sensitive data such as Social Security or bank numbers, send them carefully. See how to send a PDF securely.
Questions people ask
How do I save a PDF form after filling it out?
Fill it in Quick PDF, then tap Download. Choose Flatten form to lock the answers into the page, or keep it fillable. Open the downloaded file once to check your answers are there.
Why won't my PDF form save my answers?
Often the viewer you used shows the form but does not save a new copy with your entries. Fill it in an editor and download the filled copy. Older interactive forms built for Adobe Reader may need the sender to provide a standard PDF.
How do I fill out a PDF that has no fillable fields?
Use Add text: tap where you want to type, enter your answer and adjust the size. For checkboxes, type an X. This works on flat forms and scanned forms.
Can I fill out a PDF form on my phone and save it?
Yes. Open the form in Quick PDF in your phone's browser, tap the fields to type, then use Download or Share to save or send the filled form.
What does Flatten form do?
It turns your typed answers, checkmarks and dropdown choices into part of the page, so they look the same in every viewer and can no longer be edited as form fields.
Can I edit the form again after saving it?
Yes, if you kept it fillable. A flattened copy cannot be edited as a form, but you can still add text on top. Keeping a fillable copy for yourself is a good habit.
Do I have to pay to use Quick PDF?
You can open a PDF and edit, sign or fill it after signing in with Google or email. To download, print or share the finished file you start a subscription with a free trial: 7 days on the yearly plan ($29.78 per year) or 2 days on the monthly plan ($2.99 per month). You are charged when the trial ends unless you cancel, and you can cancel anytime.
Sign in with Google or email and start editing. Saving your file starts a free trial: 7 days on yearly ($29.78/yr) or 2 days on monthly ($2.99/mo). Cancel anytime. 🔒 Your file stays on your device.