How to open a .FDF file online
Three steps, a few seconds, no software.
Choose your .FDF file
Drag your .FDF file onto the box above or click Choose file. You can also paste a link.
Supported
Your .FDF file is opened and its pages, version and properties are shown.
Read, print or save
Scroll, zoom and search your .FDF file, print it, or go fullscreen for comfortable reading.
What is a .FDF file?
Everything worth knowing about Forms Data Format (Adobe Acrobat PDF form data) files.
An FDF file is an Acrobat Forms Data Format document developed by Adobe Systems. It contains data exported from PDF form fields and is typically used to store or transport form entries rather than the entire document structure. These text-based files are primarily opened and processed using Adobe Reader and Adobe Acrobat.
Programs that open .FDF files
| Full name | Forms Data Format (Adobe Acrobat PDF form data) |
|---|---|
| Developer | Adobe Inc. (Adobe Systems); now part of the ISO 32000 (PDF) standard |
| First released | 1996 (Adobe Acrobat 3 / PDF 1.2); standardised within ISO 32000 |
| Category | Documents |
| MIME type | application/vnd.fdf |
| Signature | 25 46 44 46 2D ("%FDF-" followed by a version, e.g. %FDF-1.2) |
Related tools
Do more with your PDF, all free and.
Is my .FDF file uploaded to your server?
No. When you choose a file, it's opened directly for you. The "From URL" option fetches the file through our server for you.
Can I open a password-protected .FDF file?
Yes. The viewer will ask for the password, just like a desktop reader. The password is never sent anywhere.
Is there a file size limit?
You can open a .FDF file up to 100 MB. Very large files may take a moment to render on older phones.
Why does my .FDF file open in a new tab on my phone?
Some mobile browsers can't display these files inside a page. In that case we hand the file to your phone's own viewer, which is the fastest way to read it.
My file says .FDF but won't open. Why?
It might not be a .FDF file at all. The viewer checks the file's signature and tells you what the file really is, plus which tool can open it.
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