About Sign PDF
Sign Any PDF Document Online — Free and Private
Need to sign a contract, form, or agreement? PDFMerger.io lets you add a legally valid electronic signature to any PDF file in seconds — no account, no app, no upload required.
Three Ways to Sign
Draw your signature — Use your mouse on desktop or your finger on a touchscreen to draw your actual signature, just like signing on paper.
Type your name — Type your name and it will be rendered in a natural cursive script, creating a clean, professional-looking signature instantly.
Upload a signature image — Already have a photo or scan of your handwritten signature? Upload it as a PNG or JPG and it will be embedded directly into the PDF.
Is It Legally Valid?
Yes. Under the US ESIGN Act (2000), UETA, and EU eIDAS regulation, an electronic signature — including a drawn or typed name — is legally binding for the vast majority of commercial contracts, rental agreements, HR documents, and personal forms. This is the same legal standard that DocuSign and Adobe Sign use for their standard tiers.
100% Private
Your PDF never leaves your browser. The signature embedding is performed locally using pdf-lib, a JavaScript PDF library. There is no server, no cloud storage, and no third party involved.