Sign PDF FREE | Add Digital Signature to PDF Online

Draw your signature, type it with a handwriting font, or upload a signature image. Drag it into position on any page, resize it, then download the signed PDF. Everything runs in your browser. Nothing is uploaded.

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PDF Signature Tool

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Frequently Asked Questions

Open your PDF, then create your signature in the left panel by drawing, typing, or uploading an image. Click Use Signature to load it onto the page preview on the right. Drag the signature to the correct position, adjust the size using the slider, and click Download Signed PDF.

Yes. JPG, PNG, and WebP images are all supported for the Upload Image tab. The image is loaded into a canvas and converted to PNG format internally before being embedded into the PDF. This ensures compatibility regardless of the original image format.

No. Everything runs locally in your browser using PDF.js for rendering and pdf-lib for embedding the signature. Your PDF and your signature data never leave your device at any point.

Yes. Change the page number in the Page Number field and click Enter or Tab to load that page in the preview. Place your signature on the new page and download. Each download creates a new signed version of the complete PDF.

About One Doc Studio

One Doc provides Forever Free browser-based tools. Nothing is uploaded. Your files never leave your device.

Free PDF Signature Tool Online - Sign Any PDF Instantly Without Software

Signing PDF documents is a daily requirement in legal, financial, business, and administrative workflows. The Sign PDF tool on OneDocPDF provides three signature methods: draw a freehand signature with your mouse or finger on a touchscreen, type your name in a handwriting-style font, or upload an existing signature image in any format including JPG, PNG, and WebP. All three methods produce a high-quality signature image that is embedded directly into the PDF page using pdf-lib, the same library trusted by thousands of PDF applications.

After signing, you may need additional processing: use our PDF Watermark tool to add a confidential stamp, our PDF Compressor to reduce the signed file size for emailing, or our PDF Merge tool to combine the signed document with supporting attachments. Browse all free PDF tools on OneDocPDF.