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What is Sign PDF?

Free tool to sign a PDF online. Draw your signature, type it in a signature font, or upload an image, then drag it onto the exact spot on the page and download the signed PDF. Runs 100% in your browser — your document is never uploaded. No signup, no watermark.

No file uploadsNo tracking of inputsNo account requiredWorks offline after first load

Sign PDF runs entirely in your browser using JavaScript (browser). Your data never leaves your device.

Free Sign PDF

Add a signature to any PDF — a contract, offer letter, form, or invoice — without uploading it anywhere. Draw your signature with a mouse or finger, type it in a handwriting-style font, or upload an image of your real signature, then drag it onto the page and download the signed file. The whole process runs in your browser with the open-source pdf-lib library, so your document never leaves your device.

Free to embed on your website · No signup required

Drop a PDF here or click to upload

Sign it without uploading — the file is opened and signed entirely in your browser

Frequently Asked Questions

No. Your PDF is opened, signed, and saved entirely in your browser using the open-source pdf-lib library. Nothing is uploaded — which is exactly what you want for contracts, NDAs, and other sensitive documents you should never hand to an online service.
Three ways. Draw it with your mouse, trackpad, or touchscreen for the most authentic look; type your name and pick a signature-style font; or upload an image of your real signature (a transparent PNG looks cleanest). Then drag it onto the page and set the size.
In the US (ESIGN Act and UETA) and the EU (eIDAS), electronic signatures are generally legally valid for most agreements when both parties intend to sign and consent to do so electronically. This tool produces a standard signed PDF suitable for everyday agreements. For notarized or certificate-based signatures, use a service built for that.
Yes. After uploading, choose which page to place your signature on from the page selector, then drag it to the right spot. You can run the tool again to add a signature to additional pages.
No. The downloaded PDF contains only your document and your signature — no watermark, no branding, no usage limits.

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Sign a PDF Without Uploading It

Add a signature to any PDF — a contract, an offer letter, a permission slip, an invoice — right in your browser. Draw your signature with a mouse or finger, type it in a signature font, or upload an image of your real signature, then drag it onto the exact spot on the page and download the signed PDF. No account, no watermark, no upload.

Why Privacy Matters Here Most

Signing is the single most sensitive thing you can do to a document. The PDFs people sign are contracts, NDAs, tax forms, and legal agreements — exactly the files you should never hand to an online service or paste into a chatbot. This tool opens and signs your PDF entirely in your browser with the open-source pdf-lib library, so the document never leaves your device.

Three Ways to Sign

Draw gives the most authentic look — sign with your trackpad, mouse, or touchscreen. Type renders your name in a handwriting-style font, which is fast and legible. Upload lets you use a photo or scan of your real signature; a transparent PNG looks cleanest because the page shows through around the ink.

Is an Electronic Signature Legally Valid?

In the United States (under the ESIGN Act and UETA) and the EU (under eIDAS), electronic signatures are generally legally binding for most agreements, provided both parties intend to sign and consent to do so electronically. This tool produces a standard signed PDF suitable for the vast majority of everyday agreements. For documents that require notarization or a qualified/certificate-based digital signature, use a service designed for that purpose.