Add Signature to PDF Online

Insert your handwritten signature, typed name, or uploaded signature image into any PDF document. Works on desktop and mobile — no installation, no account, no file uploads required.

Draw, type, or uploadAny deviceFiles stay privateLegally valid

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Three Ways to Add Your Signature to a PDF

1. Draw Your Signature

Use your mouse, trackpad, or touchscreen to draw your signature freehand directly in the browser. This creates the most natural-looking handwritten result. On a phone or tablet, draw with your finger. On desktop, use your mouse or a stylus. Choose from black, blue, or red ink. If your first attempt does not look right, simply clear it and try again before placing it on the document.

2. Type Your Name

Type your full name and select from several handwriting-style fonts. The result looks like a real signature — consistent, clean, and professional. This is the fastest option when you need to sign multiple documents or want a uniform signature across contracts, NDAs, and agreements. Typed signatures are legally equivalent to drawn ones under the ESIGN Act and eIDAS.

3. Upload a Signature Image

Already have your signature saved as an image? Upload a PNG or JPG file and SigPDF will place it directly onto your PDF. This is useful if you have a scanned wet-ink signature, a company stamp, or a signature image you regularly reuse on business documents. Transparent-background PNGs produce the cleanest result.

Also Add Text, Initials, Dates & Photos

Beyond signatures, SigPDF lets you add text fields, initials, date stamps, and image inserts to any page. Fill in form fields, add the date next to your signature, insert an ID photo — everything you need to complete and sign a document in one session without printing.

How to Add a Signature to a PDF — Step by Step

  1. Open the PDF editor above and upload your PDF by dragging and dropping or clicking to browse
  2. Select the signature tool and choose your method: draw, type, or upload
  3. Create your signature in the signature pad
  4. Click on any page to place your signature, then drag to reposition or resize as needed
  5. Navigate to other pages and add initials, dates, or additional signatures where required
  6. Click Download to save your signed PDF — the signature is permanently embedded in the document

Is Adding an Electronic Signature to a PDF Legally Valid?

Yes. An electronic signature added to a PDF with SigPDF carries the same legal weight as a handwritten signature for the vast majority of documents. The US ESIGN Act (2000) and EU eIDAS Regulation (2014) both establish that an electronic signature cannot be denied legal effect solely because it is in electronic form. Similar laws apply in the UK, Canada, Australia, and most other countries.

For standard business documents — contracts, NDAs, employment agreements, lease agreements, consent forms, and invoices — a simple electronic signature is sufficient. The only common exceptions are wills, real property deeds, and documents that specifically require notarization.

Privacy: Your Files Never Leave Your Browser

When you add a signature to a PDF with SigPDF, the entire process happens inside your web browser. Your document is never uploaded to any server. This is architecturally enforced — there is no code in SigPDF that transmits your file anywhere. For sensitive documents such as contracts, medical forms, financial agreements, and NDAs, this level of privacy is genuinely important and not just a marketing claim.

Common Documents People Sign with SigPDF

Contracts & agreementsNDAsLease agreementsEmployment contractsInvoicesMedical consent formsTax formsPermission slips

Frequently Asked Questions

How do I add a signature to a PDF without Adobe?
Open your PDF in SigPDF — no Adobe Acrobat needed. Draw your signature with your mouse or finger, type your name, or upload a signature image. Place it anywhere on the page and download the signed PDF. Everything runs in your browser.
Can I add my signature to a PDF on my phone?
Yes. SigPDF works on iPhone, iPad, and Android devices. Open it in Safari or Chrome, upload your PDF, and draw your signature with your finger. The interface adapts to your screen size automatically.
Is a signature added with SigPDF legally valid?
Yes. Electronic signatures are legally binding under the US ESIGN Act (2000) and EU eIDAS Regulation (2014). A signature added with SigPDF is legally equivalent to a handwritten signature for contracts, agreements, NDAs, and most other documents.
What is the difference between drawing and typing a signature?
A drawn signature uses your mouse, trackpad, or touchscreen to capture a freehand signature — it looks the most natural and personal. A typed signature uses your name rendered in a handwriting-style font — it is faster and more consistent across documents. Both are legally valid.
Can I add a signature image I already have?
Yes. If you have a scanned signature or a PNG/JPG image of your signature, you can upload it directly. SigPDF will place it on your PDF just like a drawn or typed signature.
Can I add a signature to multiple pages?
Yes. SigPDF supports multi-page PDFs. You can navigate through all pages and place your signature, initials, or date on any page that requires them.
Does adding a signature modify the original PDF file?
SigPDF processes the PDF in your browser and generates a new signed copy when you download it. Your original file is not modified — you always download a new file with the signature embedded.
Can I also add initials, dates, and text to the PDF?
Yes. In addition to a full signature, you can add initials, text fields for dates or names, and photos anywhere on the PDF. This lets you fill out and sign complete forms in one session.

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