Sign a PDF without uploading it
Draw your signature, drop it onto the page, and save. Add text and highlights too. It all happens inside your browser — the contract you are signing never leaves your device.
No sign-up. No upload. Nothing to install.
How to sign a PDF
- Open the document. Drop your PDF onto PDFLight. Nothing is uploaded.
- Enter annotation mode. Open the Tools menu and choose "Sign / Annotate".
- Create your signature. Draw it with your mouse, trackpad or finger — or import an existing PNG of it.
- Place it. Drop the signature where it belongs, then drag or resize it. Add text or highlights the same way.
- Apply and save. Click Apply to bake the annotations into the PDF, then Save. The signed file is written to your disk.
Why this matters more for signing than for anything else
A signature is not just an image — it is the thing that makes a document binding. And a document you are about to sign is, almost by definition, a document that matters: a lease, an employment contract, a consent form, a bank mandate. It usually carries your full name, your address, and often more.
Every other free PDF tool works the same way: you upload your file, a server you know nothing about processes it, and you trust it to delete the copy afterwards. PDFLight does not. The entire editor is JavaScript running on your own machine, so your document is read into your browser's memory and never travels anywhere. There is no upload endpoint — not as a policy, but as a fact of how the application is built.
So when PDFLight says the file is not uploaded, it is not a marketing line — it is the reason to use it for this particular task rather than any other tool. Your signature image and your contract are both handled entirely by your own browser, and neither is ever transmitted.
One current limitation, stated plainly: annotations assume upright pages. If a page is rotated, the placement will be off. Rotate the page back before signing.
Frequently asked questions
Is my signed document uploaded?
No. Both the document and your signature stay in your browser. Nothing is transmitted to a server.
Can I draw my signature or must I import one?
Either. Draw it directly on a canvas with your mouse, trackpad or finger, or import a PNG you already have.
Is an electronically drawn signature legally valid?
In most jurisdictions a simple electronic signature is valid for everyday agreements, but rules vary by country and by document type. For anything high-stakes, check what your jurisdiction requires — PDFLight does not provide a qualified/certified digital signature.
Can I also add text and highlights?
Yes. Annotation mode offers text, highlights and signature images, all of which you can move, resize and delete before applying.
Can I undo a signature after applying it?
Yes. Applying is a normal undoable edit — Ctrl+Z brings the document back.