Printing a PDF just to sign it and scan it back is a frustrating extra step that most people still do out of habit. Electronic signatures are legally valid for the vast majority of business documents, and signing a PDF digitally takes a fraction of the time.
Are Electronic Signatures Legally Valid?
Yes — in most jurisdictions and for most document types. Key legislation:
United States: The ESIGN Act (2000) and UETA (1999) establish that electronic signatures carry the same legal weight as handwritten signatures for most contracts and agreements.
European Union: eIDAS regulation recognises electronic signatures across all EU member states.
United Kingdom: The Electronic Communications Act 2000 and Electronic Identification and Trust Services Regulations 2016 provide legal recognition.
Exceptions: Some document types still require wet ink signatures or notarisation — typically wills, court orders, certain property transactions, and government-regulated documents. Check the specific requirements for your jurisdiction and document type.
For contracts, NDAs, employment agreements, freelance agreements, lease renewals, and routine business documents, an electronic signature is fully valid.
How to Sign a PDF for Free
iConvertU's Sign PDF tool lets you add your signature to any PDF without printing.
Step by step
Open iConvertU Sign PDF
Upload your PDF
Choose your signature method:
Draw: Use your mouse or touchscreen to draw your signature
Type: Enter your name and choose a signature font
Upload: Upload an image of your handwritten signature
Position the signature on the correct page and field
Download the signed PDF
No account required.
Three Ways to Create Your Signature
Drawing your signature
Use your mouse, trackpad, or touchscreen to draw your signature. On a touchscreen device (phone, tablet, iPad), this feels natural and produces a result close to your actual handwritten signature.
For the best result on a mouse: draw slowly, don't lift the mouse button mid-stroke, and if the first attempt looks off, clear and try again. A few attempts usually produce something recognisable.
Typing your signature
Type your name and the tool renders it in a cursive or signature-style font. While it doesn't look like your actual handwriting, it's legally valid for most documents and is the quickest method.
Uploading a signature image
Sign on white paper with a dark pen, photograph it, and use iConvertU's Background Remover to make the background transparent. Save as PNG. Upload this PNG as your signature — the result looks exactly like your real handwriting on any document.
This one-time setup produces the most professional-looking result.
Preparing Your Signature Image
For the cleanest uploaded signature:
Sign with a black or dark blue pen on white unlined paper
Sign slightly larger than you normally would
Photograph in good lighting (flat lay on a desk, not at an angle)
Remove the background using iConvertU's Background Remover to get a transparent PNG
Save the transparent PNG — reuse it for future signatures
What About Legally Binding Signatures?
For higher-stakes documents requiring verified identity (e.g., contracts above a certain value, regulated financial products), a basic electronic signature may not be sufficient. You may need:
Advanced Electronic Signature (AES): Linked to the signer's identity, created with data they control, detects subsequent changes. DocuSign, Adobe Sign, and HelloSign provide this.
Qualified Electronic Signature (QES): The highest level under eIDAS — legally equivalent to a handwritten signature across the EU. Requires a qualified trust service provider and identity verification.
For everyday business documents, the basic electronic signature from iConvertU is appropriate and legally valid in most contexts.
After Signing
Once signed, you may also want to: - Protect the PDF with a password to prevent further modifications - Compress the PDF if the signature image increased the file size - Merge it with supporting documents into a single submission package
Frequently Asked Questions
Is a drawn digital signature legally valid? Yes, for the vast majority of standard business documents in the US, EU, and UK. The key legal requirement is intent to sign — a drawn signature, typed signature, or checkbox all satisfy this. For notarised documents or those with specific legal requirements, check with a solicitor.
Can I add my signature to a password-protected PDF? Not directly. Unlock the PDF first to remove the password, then sign, then re-apply password protection if needed.
Can the signed PDF be edited after signing? A basic electronic signature doesn't cryptographically lock the document — the PDF could be edited after signing. For documents where tamper-evidence is important, use a formal e-signature service (DocuSign, Adobe Sign) which seals the document with a cryptographic certificate.
What if the PDF has a dedicated signature field? Signature fields in a PDF (appearing as a dashed box with "Sign here") are standard form fields. The iConvertU Sign PDF tool places a signature image overlay — it may not fill the field's native validation. For PDFs with these fields, Adobe Acrobat Reader (free) can fill them natively using its built-in "Fill & Sign" feature.
Is the tool free? Yes. iConvertU Sign PDF is completely free. No account required.
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