FDF 1.x
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FDF is a format for storing and transferring data entered into a form in a PDF file. It is primarily a text format based on PDF.
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| Extensions | .fdf |
|---|---|
| MIME types | application/vnd.fdf |
| Signatures | 254644462d31 at byte 0 (Adobe Acrobat Forms Data Format 1.x)25464446 at byte 0 |
| PRONOM | fmt/1500 |
| Wikidata | Q28755749 |
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From Just Solve the File Format Problem (File Formats Wiki), PRONOM, Wikidata. Updated 2026-10-24.