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How to Add a Handwritten Signature to a PDF on iPhone or iPad

Use Fileso Sign PDF to place a handwritten signature, check its size and position, and verify the saved document.

2 min readFileso

You can add a handwritten signature to a PDF in Fileso without printing the document. This is useful for a form that asks for a visible signature and date. On iPad, Apple Pencil can make drawing more comfortable; on iPhone, you can use a finger.

Check what the recipient requires

A visible handwritten signature is a mark placed on the page. It is different from a certificate-based digital signature that cryptographically verifies a document. Confirm which type the recipient accepts before editing the form.

Save a working copy of the PDF, especially if it is the only copy of a completed application or agreement. If the file is locked, open it with the required password before editing.

Place the signature in Fileso

  1. Open Tools → Sign PDF and select the document, or open the PDF editor from the file.
  2. Use the signature control to draw your signature.
  3. Insert it on the page containing the signature field.
  4. Adjust its position and size so the complete mark fits within the intended area.
  5. Add the requested name or date separately when the form requires it.
  6. Save the PDF and reopen the saved version.

Zoom in while positioning the signature so you can see whether it covers labels, lines, or neighboring form content. Check that it is on the correct page before saving.

Verify the file you will send

Inspect the saved document at a normal reading size. A signature that looks fine while zoomed in may be too small when the entire page is visible. Reopen the exported or shared copy rather than relying only on the editor’s current canvas.

If the recipient uses a different PDF reader, check that the mark remains visible there. Keep an unsigned original in case the form needs to be completed differently.

When a signature is not enough

Some forms also need interactive fields completed, supporting pages attached, or a specific submission route. Adding a signature does not fill those requirements automatically.

Do page cleanup and merging before final placement when possible. If you later rotate or rearrange the document, inspect the signature again in the final output. For important submissions, use a clear filename so the signed copy is easy to distinguish from the source.

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