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Everything You Need to Know About Signing PDFs
How PDF Signing Works
SlimPDF's signing tool lets you draw a signature using your mouse or touchscreen, then place it on any page of a PDF document. The signature is captured as an image from a drawing canvas, then embedded onto the specified page at your chosen position and size. The tool uses the pdf-lib library to insert the signature image directly into the PDF. The result is a new PDF with your signature visually embedded on the page.
When You Need to Sign a PDF
Many situations require a signature on a PDF document: signing contracts or agreements, approving proposals, filling out forms, acknowledging receipts, or adding a personal touch to letters and certificates. Instead of printing the document, signing by hand, and scanning it back, SlimPDF lets you add your signature digitally in seconds. The result looks professional and saves paper.
Drawing Your Signature
SlimPDF provides a drawing canvas where you can create your signature using a mouse, trackpad, or touchscreen. Take your time to draw a clean signature — you can clear the canvas and try again as many times as needed. On touch devices like tablets and smartphones, using a finger or stylus produces natural-looking signatures. The canvas captures your exact strokes for an authentic appearance.
Privacy and Security
Signing documents often involves sensitive legal or financial paperwork. With SlimPDF, your document and signature never leave your device. The entire signing process runs locally in your browser. No data is transmitted to any server. This makes SlimPDF ideal for signing confidential contracts, NDAs, medical forms, or any other documents where privacy is critical.
Tips for a Professional Signature
For the best results, draw your signature slowly and deliberately. Use a stylus or finger on a touchscreen for the most natural result. Position the signature appropriately — typically near a signature line or at the bottom of the relevant page. Adjust the size so the signature fits naturally within the available space. If your first attempt does not look right, use the Clear button and try again.
FAQ
How do I sign a PDF online?
Upload your PDF, draw your signature on the canvas, select the page where you want to place it, adjust the position and size, and click Apply Signature. Your signed PDF is ready to download instantly.
Is this a legally binding digital signature?
SlimPDF adds a visual signature image to your PDF. While this provides a personal mark, it is not a cryptographic digital signature. For legally binding digital signatures, a certificate-based signing tool may be required depending on your jurisdiction.
Are my documents secure when signing?
Yes. Everything happens locally in your browser. Your PDF and signature data never leave your device, and no information is sent to any server.
Can I sign on a specific page?
Yes. After uploading your PDF, you can select which page to place your signature on. You can also adjust the signature's position and size on that page.
What devices can I use to draw my signature?
You can draw your signature on any device with a browser — desktop (using mouse or trackpad), tablet, or smartphone (using finger or stylus). Touch devices often produce the most natural-looking signatures.