How to sign a PDF on iPhone or Android

What this workflow helps you do

A phone browser can run Sign PDF without a separate desktop program. Device memory, the mobile file picker, camera permissions, and download handling matter more on a phone, so smaller batches are easier to verify.

Open the PDF on a phone, draw, type, upload, or pair a signature, place it precisely, and save a signed copy.

Plan the task in Sign PDF

Create and place visible signature artwork on one or more PDF pages. This tool does not create a certificate-backed digital signature or prove signer identity.

Sign PDF lets you draw, type, upload, or temporarily send signature artwork from a phone, then place and resize visible marks on one or more pages. This is an electronic visual-signature workflow, not a certificate-backed digital signature or identity-verification service.

1. Draw, type, or upload signature artwork. Choose the method that produces a clear mark, then position it carefully inside the correct signature area.
2. Draw a signature on a phone for a desktop PDF. The optional pairing flow transfers temporary signature artwork to the desktop session. The PDF itself remains on the desktop browser.
3. Confirm what type of signature is required. Some documents accept a visible electronic mark, while others require a certificate, verified identity, witness, or regulated signing platform. Check before signing.

Complete the task reliably on a phone

The mobile file picker may show Photos, Files, Downloads, a camera option, or cloud-provider shortcuts depending on the device. Select only the sources required by Sign PDF and return to the browser while processing finishes.

Large documents and high-resolution images use device memory. If the browser reloads or becomes unresponsive, keep the originals and retry with a smaller supported batch rather than repeatedly starting the same large job.

1. Use a current browser and keep the tab active during processing.
2. Save the result to Files or Downloads.
3. Reopen the download outside the tool before sharing it.

Settings and limitations to check

Can I sign a PDF online for free with no account? Yes. Add visible signature artwork and download the signed copy without registration.

Is this a digital signature with a certificate? No. The tool adds visible signature artwork and does not issue a cryptographic certificate or prove signer identity.

Is my PDF transferred to the phone? No. The optional phone workflow transfers only temporary signature artwork; the PDF remains in the desktop browser.

1. Use only the settings needed for the required result.
2. Keep the source file available for comparison.
3. Do not rely on an unsupported exact-size, fidelity, or security promise.

Review the completed file

Reopen the download on the phone and verify every signature mark and required page.

Open the downloaded result in a separate viewer, inspect important pages or details, and repeat the workflow with adjusted settings if the output is not suitable.

1. Confirm the expected file type and page count.
2. Check important text, images, order, and orientation.
3. Share or submit only the reviewed copy.