Sign PDF Online

Sign PDF Online is for people who need a quick visual signing workflow without handing the document to a hosted signing service. It uses the local Plain Tools signing interface, so you can draw, type, or place a signature and export the result directly from the same browser session.

What this tool does

Place a visual signature on a PDF locally using draw, type, or image-based signature controls.

This landing page uses the same underlying workflow as Sign PDF. The core operation runs locally in your browser, so the file stays on your device during processing.

Step-by-step instructions

1Upload the PDF and choose a visual signature method such as draw, type, or image placement.
2Position the signature where it belongs and review page alignment before final export.
3Download the signed PDF locally and keep the original copy unchanged for recordkeeping.

Tool workspace

Open the live tool here or jump to Sign PDF.

Best-effort offline signing

Best-effort offline signing. This is a visual signature placement (not a cryptographic digital certificate). Files never leave your device.

Drop a PDF here, or click to browse

Sign locally in your browser with no uploads

Click or drop files to continue

Signature input

Upload a PDF, add a signature, and place it on the selected page.

No PDF selected yet.

Draw with mouse, stylus, or touch.

Placement controls

Choose page and position percentages (MVP control mode).

Page

Signature size (28% width)

X position (45%)

Y from top (78%)

Why Plain.tools is private

No upload step

The core file workflow on this page runs in your browser, so the document does not need to be sent to a Plain.tools server to complete the task.

Easy to verify

You can inspect browser network requests yourself while using the tool and confirm whether file bytes are being transmitted.

Built for task flow

The aim is to let you finish a PDF job quickly without account friction, upload queues, or hidden processing steps that are hard to audit.

Limitations and checks

Review the signature placement and page scaling carefully before sharing the signed output.
If the recipient needs a specific signing standard or hosted audit trail, check those requirements before relying on a local visual signature alone.
Keep the original unsigned file so you can rebuild the signed copy if the first export needs changes.

FAQ

Can I sign a PDF online without uploading it?

Yes. The signing step runs locally in your browser, so the PDF stays on your device during the core workflow.

Does this create a hosted e-signature workflow?

No. This page is for local PDF signing in the browser, not a hosted account-based signature routing service.

Should I keep the unsigned source file?

Yes. Keep the original version and create a separate signed output for the document you actually plan to share.