How to sign a PDF on an Android phone

How to sign a PDF on an Android phone

You can sign a PDF yourself on Android, or you can send a PDF so someone else signs it. Those are different workflows, so the first step is to decide whether you are the only signer or whether a client, tenant, vendor, or candidate must sign too.

Adobe Acrobat separates those workflows on Android, and Google Drive also offers eSignature for eligible Workspace users. If you need a broader sending workflow, see sign a PDF online.

Sign your own PDF in Adobe Acrobat on Android

Open the PDF in Acrobat on Android, tap Fill & Sign, tap the signature tool, then create or choose a saved signature, place it, and tap outside the signature to finish. Adobe’s mobile help says you can create a new signature by drawing it, adding an image, or capturing it with the camera.

If you turn on Save Online, a saved signature can sync across devices for later use in Adobe apps. That is useful if you sign on your phone one day and on a laptop the next, but it does not make every file signable.

Example: a landlord opens a lease PDF on their phone at 9 pm, adds a saved signature, and sends the signed copy back by email.

Adobe says signing may not work on some protected files, including password-protected or security-protected files. If the app refuses to sign, use an unlocked copy or export a clean PDF first.

Send a PDF for signature from Android

To request signatures in Adobe Acrobat on Android, open the file, choose More options, then Request e-signatures, add recipient email addresses, reorder signers if needed, add fields, review, and send. Adobe’s mobile guide says the request flow supports roles such as Sign, Fill form, Approve, and Copied. Adobe help

Use the right role for each person. If a signer is set as Copied, they are not asked to sign. If a person only needs to approve, do not assign them a signing field they should not complete. Adobe help

Copyable checklist before you send

• Check that the PDF is the final version
• Add the correct email addresses
• Assign each field to the correct person
• Mark required fields
• Review the message before sending
• Check the signing order if there is more than one signer

Adobe says mobile request workflows require an Acrobat subscription. Plan access can differ by organisation and account, so check your plan before you promise same day turnaround. If you want to revise the PDF first, see edit a PDF before signing.

When Google Drive is the better fit

Google Drive can be enough if you already use Workspace and have eSignature access. Google says eSignature is available only to eligible Workspace users and plans. Google eSignature

The trade off is simple: once you send a signature request, Google locks the PDF to prevent changes until you cancel the request and send a new one. That helps control version changes, but it also means you should finish editing first. Google eSignature

Google also says some PDFs will not fill correctly on mobile, including XFA forms and forms manually formatted to look like a form. If the form behaves oddly on Android, try a desktop app or ask for a flatter PDF. Google PDF forms Google mobile forms

A practical use case is a manager who needs a simple internal approval or signature request and wants to keep the file inside Google Workspace.

Common mistakes and how to fix them

Mistake 1: using the wrong workflow. Fix: if only you sign, use Fill & Sign. If someone else must sign, use Request e-signatures. Adobe help

Mistake 2: trying to sign a protected file. Fix: use an unlocked copy or export a clean PDF before you start. Adobe help

Mistake 3: assuming every PDF form will work on Android. Fix: if the form is XFA or was manually built to look like a form, switch to a desktop app or request a flatter PDF. Google PDF forms Google mobile forms

Mistake 4: not assigning fields carefully. Fix: match each signature, date, checkbox, or text field to the correct signer before sending. Adobe help

Mistake 5: relying on a feature your account does not have. Fix: check whether your Adobe plan or Google Workspace plan includes the request flow before you promise same day turnaround. Google eSignature

What to check before you tap send

Before you send, check that the PDF is final, every name and email is correct, signing order is set if needed, required fields are marked, and the file opens properly on your phone. If any of those are wrong, fix them first, because mobile sending is easy to rush.

If you want a simple signing service that emails the signed PDF and audit certificate, SignKaro can do that. It does not offer Aadhaar eSign or a DSC, so it is not suitable for statutory workflows that require one.

FAQ

Can I sign a PDF directly on Android?

Yes. Adobe says you can use Fill & Sign in Acrobat on Android to place your signature on a PDF. If the file is protected or unsupported, you may need a clean copy first. Adobe help

How do I send a PDF for signature from Android?

In Adobe Acrobat, open the file, choose More options, then Request e-signatures, add recipients, assign fields, review, and send. Google Drive can also work for eligible Workspace users with eSignature access. Google eSignature

Do I need Adobe or Google Drive to do it?

Not always, but they are common ways to do it on Android. Adobe is useful for signing your own PDFs and requesting signatures, while Google Drive works for eligible Workspace accounts and some PDF form filling. Google PDF forms

Why will some PDFs not sign or fill on Android?

Some files are protected, and some forms are not built in a mobile-friendly way. Google says XFA forms and some manually formatted PDFs may not fill correctly on Android, and Adobe says protected files may not sign. Google mobile forms