Sign a PDF without uploading it
Most online sign-a-PDF tools ask you to upload your document to their servers, which is a poor trade for something as sensitive as a signed contract, an NDA, or a form with your personal details. This tool takes the opposite approach: your document is opened, rendered, signed, and exported entirely in your browser. Nothing is transmitted, nothing is stored remotely, and the signed PDF is built on your own machine.
That privacy is possible because modern browsers can do the heavy lifting locally. The PDF is rasterised for preview with pdf.js, your signature images are stamped on with pdf-lib, and the result is saved straight to your downloads. The same technology that powers our PDF-to-image and image-to-PDF tools handles the document here, so it is fast, works offline once loaded, and never puts your paperwork on the internet.
The practical upshot is that you can sign anything — a lease, an invoice, a permission slip, a job offer — and send it back in a couple of minutes, confident that the only copy of the signed file is the one you downloaded.
Placing signatures exactly where they belong
Signing is really about placement: getting your signature onto the right line, at the right size, on the right page. Choose a signature from your saved gallery, then click the spot on the page where it should go — it drops in centred on your click. From there you can drag it to nudge it onto the line precisely and resize it so it fits the space without overwhelming the surrounding text.
Real documents often need more than one mark. You might initial every page, add a signature and a date on the last one, or sign in two places. This tool lets you add as many placements as you need across any pages, each one independent, so you can build up exactly the set of marks the document calls for. Remove or reposition any of them right up until you export.
Because placements are stored as positions relative to the page rather than fixed pixels, they stay accurate no matter how the preview is sized on your screen. What you see in the editor is what lands in the exported PDF, down to the point.
Your signatures, made once and reused
The best signature to use here is a clean, transparent one — ink with no white box around it, so it sits naturally over printed text. Our signature maker produces exactly that, whether you draw it, type it, or upload and clean up a photo of your real pen-on-paper signature. Anything you save there shows up in this tool automatically, because both share the same on-device gallery.
If you just need something quick, you can also draw a signature directly in this tool and use it immediately; tick the option to keep it and it joins your gallery for next time. Either way, the goal is the same: capture your signature once and reuse it across every document you sign, instead of recreating it each time.
Keeping signatures local rather than in the cloud means they are private and instantly available, with no account required. The trade-off is that they live on the browser you saved them in — which, for signing your own documents on your own device, is precisely where you want them.
When to step up to a full e-signature platform
Stamping a visible signature onto a document is enough for a great many everyday agreements, and it is what this tool does quickly and privately. But some documents need more than a visible mark: a cryptographic audit trail proving who signed and when, identity verification of each signer, tamper-evidence that flags any change after signing, and a defined signing order across multiple parties.
Those are the hallmarks of a formal electronic signature platform, and they matter for regulated contracts, high-value deals, and anything where a signature might be challenged. For those cases our sister product OpusPDF provides full e-sign workflows — request signatures from others, track status, and get a legally robust, verifiable record — and you can jump straight to it from the link on this page.
Think of it as two tiers: this tool for the fast, private, self-service signing you do every week, and OpusPDF for the moments that demand a verifiable, auditable signature. Use the right one for the document in front of you, and you get both speed and rigour where each is needed.