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How to sign a document on your phone
Printing a document just to sign it, scan it and send it back is mostly a thing of the past. Your phone can sign PDFs in a minute. The main questions are which method is accepted for your document and how to send a clean, final copy.
A step-by-step guide, then e-signature apps. The legal validity of electronic signatures depends on your country and the document type; some agreements require advanced or qualified signatures. If unsure, ask the other party or a lawyer.
Open the document properly
Open the PDF in a signing or PDF app rather than taking a screenshot. If the sender used a signing service, follow its link; it records the process for both sides.
Sign and complete every field
Draw or insert your saved signature, add the date and initials where asked, and fill all required fields. Read the whole document before you sign.
Send a final copy
Save as a flattened PDF so fields cannot be changed, and send it through the channel the other party asked for. For scanning paper documents, see how to store important documents safely.
Know which signature you need
A simple electronic signature is fine for many everyday agreements. Some contracts and official documents need an advanced or qualified signature tied to your verified identity. Compare apps in e-signature apps.
| Step | What you do | Why |
|---|---|---|
| 1. Open the file | in a PDF or signing app | editable copy |
| 2. Read it fully | before signing | know what you agree to |
| 3. Sign and fill | signature, date, initials, fields | complete document |
| 4. Flatten and send | final PDF, secure channel | no accidental edits |
| 5. Keep a copy | store the signed version | proof later |
Frequently asked questions
How do I sign a PDF on my phone?
Open it in a PDF or e-signature app, add your signature, date and any required fields, then save and send a flattened copy.
Is an electronic signature legally valid?
In many countries, for many documents, yes. Some documents need advanced or qualified signatures; check local rules.
What does flattening a PDF mean?
Merging signatures and filled fields into the page so they can no longer be edited.