What does Sign PDF do?

It lets you add electronic signatures to PDF documents. Create a signature by drawing, typing, or uploading an image, then place it anywhere on any page. The signed PDF downloads directly to your device.

Is my PDF uploaded to a server?

No. The entire signing process runs in your browser. Your document and signature never leave your device.

Is this a legally binding digital signature?

This is an electronic signature (an image placed on the PDF), not a cryptographic digital signature with a certificate. For most contracts and agreements, electronic signatures are legally accepted. For documents requiring certificate-based signatures, you’ll need a tool like Adobe Sign.

Can I place multiple signatures on one document?

Yes. Add as many signatures as you need across different pages. Each one can be independently positioned and resized.

Are my saved signatures stored somewhere?

Signatures are saved in your browser’s local storage. They persist between sessions on the same browser but are never sent to a server.

Does it work with password-protected PDFs?

Yes. You’ll be prompted for the password. Decryption happens locally in your browser.

Can I sign PDFs on my phone?

Yes. The mobile layout is touch-friendly. You can draw a signature with your finger and place it on the document.

PDF電子署名

PDFドキュメントに電子署名を追加します。

1. Select PDF

Select a PDF file from your device. All processing happens locally in your browser.

2. Create signature

Draw, type, or import your signature. Save it for future use.

3. Place signatures

Click on any page to add your signature. Drag to reposition.

4. Download

Get your signed PDF instantly. Ready to share or submit.

About Sign PDF

How PDF Signing Works

You create a signature — draw it, type it, or upload an image — then place it on the page where it belongs. Drag to position, resize to fit, and the tool embeds it as a PNG image directly into the PDF structure. The signed document downloads to your device.

OxygenPDF keeps a local signature library in your browser so you don’t have to redraw every time. Add multiple signatures, pick the one you need, drop it on any page. Undo and redo work too, so mistakes aren’t permanent.

Where PDF Signatures Come In Handy

Electronic signatures show up constantly in everyday work. Any time somebody says “sign and send back,” this is the tool.

Contracts & Agreements

Rental leases, freelance contracts, NDAs. Sign the page, download the file, email it back. No printing required.

HR & Onboarding

Offer letters, tax forms, policy acknowledgments. New hires can sign everything from their laptop.

Approvals & Invoices

Add your signature to purchase orders, expense reports, or invoices before sending them to accounting.

Academic Forms

Permission slips, enrollment documents, recommendation letters. Sign and return without a trip to the office.

Three Ways to Create a Signature

Draw mode lets you sign with a mouse, trackpad, or finger on a touchscreen. The stroke captures your actual handwriting style.

Type mode generates a signature from your name using handwriting-style fonts. Pick a font, adjust the size, done. Faster than drawing if you just need something clean.

Upload mode accepts an image of your existing signature — a photo or scan. The tool strips the background so it layers cleanly onto the PDF page.

How It Compares

PDF signing tools range from basic stamp-your-name utilities to full digital certificate systems. Here’s where OxygenPDF fits.

機能	Adobe Acrobat	Smallpdf
Draw signature
Type signature with fonts
Upload signature image
Multiple signatures per document
Local signature library
Undo/redo placement
No file upload required	Desktop only
Free to use		Limited

Your Signature and Document Stay Private

A PDF signature is essentially a picture of your handwriting. You probably don’t want that stored on a random server alongside the document it’s attached to. Contracts, HR forms, financial paperwork — these are exactly the files worth keeping local.

OxygenPDF runs the signing process in your browser. Your file isn’t uploaded. Your signature stays in your browser’s local storage and never leaves your device. Close the tab and nothing remains on any server, because nothing was sent to one.