Sign PDF
Draw, type or upload a signature and place it anywhere, plus dates and initials.
Free, no uploads, no sign-up. Runs 100% in your browser.
How Sign PDF works
Sign PDF runs entirely in your browser. Draw, type or upload a signature and place it anywhere, plus dates and initials. Under the hood it uses pdf-lib (a pure-JavaScript library that creates and edits PDF structure (pages, text, images, forms)), PDF.js (Mozilla’s PDF renderer, used for thumbnails, previews and text extraction (runs in a Web Worker)) and signature_pad (smooth, pressure-aware signature drawing on canvas). Your files are read into this tab’s memory, processed on your own CPU, and handed back to you as a download. Nothing is sent to a server.
Input: PDF.
How to use Sign PDF
- Drop the PDF you need to sign.
- Create a signature: draw it, type it in a handwriting font, or upload an image.
- Click the page to place it; drag and resize as needed. Add dates or initials too.
- Apply and download the signed PDF.
Tips
- Your signature is drawn and embedded locally. It is never uploaded.
- This creates a visual signature, not a certificate-based digital signature.
Sign PDF FAQ
- Is this legally binding?
- Visual e-signatures are accepted for many everyday agreements, but requirements vary by country and document. For regulated documents, use a certificate-based signing service.
- Are my files uploaded?
- No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
- Is it free? Are there limits or watermarks?
- Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
- Does it work offline?
- Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.
Related tools
- Fill PDF Form: Detect form fields and fill text boxes, checkboxes and dropdowns.
- Flatten PDF: Flatten form fields and annotations into static page content.
- Edit PDF: Add text, shapes, highlights, images and freehand drawing to any page.
- Merge PDF: Combine multiple PDFs into one ordered document with drag-and-drop sorting.