To fill a PDF form with OnCloudPDF, select the form, click a field on the page or find it in the panel, type or choose your answers, and click Fill form.
Processed in your browser
No upload
No account
1Choose file
2Adjust and run
3Download
or drop a file here, or paste one with CtrlV
Good to know: Only interactive forms (AcroForm) are filled. A PDF that is just a picture of a form has no fields; print it, or add text with the Sign or Stamp tools. Dynamic XFA forms (Adobe LiveCycle) are not supported and the tool says so. All limits
To fill a PDF form with OnCloudPDF, select the form, click a field on the page or find it in the panel, type or choose your answers, and click Fill form. Text fields, check boxes, radio buttons, drop-downs and lists are supported, and you can flatten the answers so they cannot be edited. The form is filled in your browser and is not uploaded.
Updated · Runs in your browser, no upload, no account
How to use Fill PDF Form
Select the PDF form. The fillable fields appear over the pages and in the panel.
Fill in the fields: type in text boxes, tick check boxes, choose one option for radio buttons and drop-downs.
Switch on Flatten the answers if the file should no longer be editable.
Click Fill form and download the completed PDF. Open it once to check the answers.
What it does and what it does not do
Only interactive forms (AcroForm) are filled. A PDF that is just a picture of a form has no fields; print it, or add text with the Sign or Stamp tools. Dynamic XFA forms (Adobe LiveCycle) are not supported and the tool says so.
Text is drawn with the built-in Helvetica font, so only Latin letters and common symbols are accepted (accents are fine). Chinese, Japanese, Korean, Arabic, Cyrillic or Greek text is refused with a clear message instead of being drawn wrongly.
Digital-signature fields and push buttons cannot be filled here, and read-only fields are shown but not changed.
Scripts inside the form (calculated totals, format rules, show/hide logic) are not run. A calculated field keeps the value you type; check totals yourself.
Without flattening, the answers stay editable and some readers redraw the fields in their own style. Flatten makes every viewer show the same page and cannot be undone on the downloaded copy, so keep the unflattened file if you may need to edit again.
Password-protected PDFs ask for the password first. Pages, links and bookmarks are kept as they were.
Is my file uploaded?
The form and your answers stay in your browser. They are written into the PDF locally with the same engine as the other tools. Nothing is sent to a server.
Fillable fields versus a scanned form
A fillable form has real fields: you can click into them in a PDF reader. This tool shows each field as a box on the page and lists it in the panel, so even a form with hundreds of fields is manageable, with a search box to jump to one. If no field appears, the PDF is a flat page; there is nothing to fill in and the tool tells you so.
Flatten or keep the form editable
Keep the form editable when the other person must change or add answers. Flatten when you send it as final, for example to a registry or a landlord: the answers become part of the page, cannot be edited by mistake and look the same in every viewer, including printers and phone previews.
Ways to fill in a PDF form
Ways to fill in a PDF form
Criteria
OnCloudPDF
Server-based online tools
Desktop software
Where the form is processed
In your browser
On the provider's server (upload needed)
On your computer
Field types
Text, check box, radio, drop-down, list
Varies by provider
All, plus scripts and signatures
Flatten option
Yes, one switch
Varies
Yes
Account or install
No account, no install
Often an account for downloads
Installation
Frequently asked questions
How do I fill in a PDF form without Acrobat?
Open the form in this tool, click each field or use the panel, type your answers and click Fill form. The completed PDF downloads from your browser.
Are my answers uploaded anywhere?
No. The form is filled locally in your browser, so personal data in it never leaves your device.
Why does the tool say there are no fillable fields?
The PDF is probably a flat page or a scan, without interactive fields. You cannot fill it here; use Sign or Stamp to place text, or print it.
What does flatten do?
It writes the answers into the page and removes the fields. The result looks the same everywhere but can no longer be edited.
Can I type accents or non-Latin letters?
Accents and Latin letters yes. Cyrillic, Greek, Arabic and East Asian scripts are not supported because the form font cannot draw them; the tool refuses them instead of showing wrong characters.
Does it work with XFA forms?
No. XFA (dynamic Adobe forms) can only be filled in Adobe Acrobat Reader. The tool detects them and says so.
Related PDF tools
Flatten PDF – Flatten fillable PDF form fields into static content in your browser. Only form fields are flattened; the file is never uploaded. Free, no account.
Sign PDF – Draw or upload your signature and place it on a PDF's first, last or all pages. Runs in your browser. Visual signature only, not a digital certificate.
Protect PDF – Add a password to a PDF with AES-256 encryption and optionally block printing, copying or editing. Done in your browser: the file and the password never leave your device.
Edit PDF Metadata – Change or clear a PDF's title, author, subject, keywords and creator in your browser. Free, no upload. Hidden/XMP metadata is not removed.
