PDF Signature Drawer - Online Add Handwritten Sign

Simply upload your PDF, draw your signature in the signature panel using your mouse, stylus, or finger (on touch devices), adjust the size and position by dragging the signature overlay on the PDF preview, then click Export Signed PDF. The tool uses pdf-lib to embed your signature directly into the PDF file — all processed locally in your browser.

No. This tool operates entirely on the client side. Your PDF never leaves your device. All PDF parsing, signature rendering, and export happen within your browser using JavaScript. We do not store, transmit, or have access to your documents.

Yes! Toggle the "Apply to all pages" switch to place the same signature on every page of your PDF. If you prefer signing only specific pages, turn this option off and navigate to each page individually to position your signature where needed.

The tool accepts PDF files (.pdf) up to 50 MB in size. The exported result is always a standard PDF file compatible with any PDF viewer, including Adobe Acrobat, Preview, and web browsers.

Absolutely. Choose from preset colors (black, dark blue, blue, red) or pick any custom color using the color picker. Adjust the pen thickness from fine (1px) to heavy (8px) using the slider or preset buttons. The signature appears with a transparent background, so it blends naturally onto your PDF.

Yes! The tool is fully responsive and supports touch input for drawing signatures on smartphones and tablets. You can use your finger or a stylus to create a natural handwritten signature directly on your mobile device.

After drawing your signature, it appears as a draggable overlay on the PDF preview. Simply click and drag the signature to reposition it anywhere on the page. The default position is the bottom-right area (common for signatures). You can also adjust the signature size using the dedicated slider.

Yes. The tool uses pdf-lib which preserves the original PDF's vector quality, text, images, and formatting. Only the signature image (embedded as a PNG with transparency) is added as an overlay. The original content remains untouched at full fidelity.

Yes! Use the Undo button to revert the last stroke, and Redo to restore it. You can also tap Clear to start over with a blank signature canvas. The undo history supports up to 30 steps.