How can I make a fillable PDF usable with a keyboard alone?

Test the saved PDF—not just the authoring screen—in the viewer you expect readers to use. Set aside your mouse or trackpad and try to complete the form from beginning to end. If readers may use other viewers, test those too: the cited Acrobat guidance does not establish that every viewer behaves alike.

Check four things: can you reach and operate every field and control; does keyboard navigation follow a sensible completion order; can you see which field or control has focus; and do labels or descriptions explain what each field asks for?

Acrobat’s form guidance describes using Tab and Shift+Tab to move between fields, and Space and arrow keys for options or list items. [S1] Treat these as Acrobat-specific test instructions, not a guarantee for every viewer or control.

Write down the intended sequence—for example, contact details, request details, then consent and submit. Starting at the first field, advance one stop at a time and record where you land. Compare the observed sequence with your plan and with how someone would naturally complete the form. Then navigate backward to check that you can return to earlier fields.

Note any skipped field, unexpected jump, or control you cannot get past. Test buttons, checkboxes, radio choices, and lists as well: reaching a control does not confirm that you can operate it. Acrobat recommends an order that follows document structure and describes testing with Tab and Shift+Tab. [S1] If you change the order, test the saved PDF again.

At each stop, pause and check whether you can tell which field or control is active. If focus is unclear, record that as a problem even if you can type. Acrobat desktop documents a “Show focus rectangle” preference for indicating the focused form field; that is an Acrobat setting, not evidence that other viewers have the same option. [S3]

For each field, ask whether its label or description makes the requested information clear. A box labeled only “Enter here,” for instance, may not tell you whether to enter a name, date, or reference number. Acrobat recommends field labels and concise descriptions such as tooltips. [S1]

Keep a log: “Field: [name]. Expected next: [field]. Actual next: [field]. Focus visible: yes/no. Keyboard operation: yes/no.”

Retest the saved version after edits that add, remove, or move fields. Acrobat’s preferences describe an option to adjust tab order automatically when fields are created, deleted, or moved, but verify the resulting order yourself. [S3]

Use this record for each pass:

PDF version: [filename or revision] Viewer: [name and version, if known] Observed forward order: [field 1] → [field 2] → [field 3] Reverse navigation checked: [yes/no] Visible focus at each stop: [yes/no/unclear] Controls operable by keyboard: [yes/no; list exceptions] Labels or descriptions unclear: [field and issue] Result: [fixes needed / ready for next review]

If an issue appears in a particular viewer, note which one and retest there after making a change. A successful check in one viewer does not prove the PDF behaves the same way in all viewers.