Sign PDF Document
Use this free Sign PDF Document online tool to add secure electronic signatures to your PDFs in seconds. It is built for students, teams, and professionals who need a clean result quickly. Upload, process, and download in a few clicks. Up to 50 MB per file.
How to Use Sign PDF Document
Complete your task in four clear steps.
- Step 1: Upload your PDF document.
- Step 2: Select your signature method: 'Type Name', 'Draw Signature', or 'Upload Image'.
- Step 3: Place, resize, and position your signature on the correct page.
- Step 4: Click 'Sign PDF' to flatten and download your signed document.
Why Choose OptaPDF for Sign PDF Document?
- Three convenient signing modes to suit all electronic workflow standards.
- Visual drag, drop, and scale signature placement onto any page.
- Flattens signature securely onto PDF layer to prevent editing.
Security Guarantee
Your upload is protected with TLS/SSL encryption. Files are automatically and permanently deleted from our servers after 30 minutes. We do not read, share, or store your content. OptaPDF works on iOS, Android, Chrome, Safari, Edge, and desktop browsers without an app installation.
Frequently Asked Questions About Sign PDF Document
Direct answers about using this tool securely and effectively.
Upload your PDF to OptaPDF's Sign tool, create your signature using any of our three methods, place it on the document, and download.
Yes, electronic signatures are legally recognized in many jurisdictions under ESIGN and eIDAS acts for commercial agreements.
The signed document is named with '_signed.pdf' appended to the base filename (e.g., x_signed.pdf).
Yes, our drawing canvas is touch-sensitive, making it perfect for signing with your finger or stylus on smartphones.
Yes! Our 'Upload Image' signature option supports PNG and JPG formats, and transparent PNGs look incredibly professional.
No. Your signature is rendered directly onto the document canvas temporarily, and all files are auto-deleted after 30 minutes. We never store signatures.
No, OptaPDF is completely free and adds zero watermarks.
Yes, you can place multiple signature blocks on different pages before finalizing the PDF.
Our backend flattens the signature image directly into the PDF rendering layers, making it impossible to separate or copy.
We support PDF uploads up to 50MB.