If you sign documents regularly, re-drawing your signature with a mouse every single time is both tedious and inconsistent — a signature scrawled with a trackpad looks different on every contract, which is exactly the opposite of what a signature is supposed to be.
The better approach is to create your signature once, get it looking right, and then reuse the same one on every document. This guide covers making a good signature and saving it.
The three ways to create one
Draw it. Sign with your mouse, trackpad, or — much better — a finger or stylus on a touchscreen. It looks the most like a real signature. Drawing with a mouse is genuinely hard, so if the result looks like a toddler's scribble, try one of the other two.
Type it. Enter your name and it's rendered in a signature-style font. It's clean, legible, and instantly consistent. It doesn't look like your handwriting, but for most business documents nobody expects it to.
Upload an image. This gives the best result if you want your real signature: sign a blank sheet of white paper with a dark pen, photograph or scan it, and upload. The catch is the background — you want a clean, white one, or you'll get a grey rectangle around your signature on the page.
The upload trick worth knowing: if your photographed signature has a grey or shadowed background, run it through Enhance PDF first (or scan it properly). A clean white background makes the signature sit invisibly on the document instead of floating in a visible box.
The steps
Open Blackpdf's Sign PDF tool and drop your document in.
Click Add signature and choose Draw, Type, or Upload.
Create it, and take your time. This is the version you'll be reusing — get it right once and you never have to fight with it again.
Place it on the document. Drag it to the signature line and resize it to fit. It should sit at a natural size — a signature that dwarfs the line looks wrong.
Finish and download. If you're signed in, your signature is saved to your account, so it's there waiting the next time you open the tool on a different document.
Should you flatten it?
When you finish, you'll have the option to flatten the document. It's worth understanding what that does.
Flattening merges your signature permanently into the page content. Without it, the signature remains a separate object that could, in principle, be selected and moved or removed by someone with a PDF editor.
Flatten when you're sending a signed document to someone else — which is almost always. It's the difference between "here is my signature on this contract" and "here is a contract with a movable picture of my signature sitting on top of it." Our flattening guide covers the mechanics.
Common questions
Is a drawn or typed signature legally binding?
In most jurisdictions, yes — electronic signatures are broadly recognised for ordinary business documents. But an electronic signature (a picture of your mark) is not the same thing as a digital signature (a cryptographic certificate that proves who signed and that nothing has changed since). Some contexts require the latter. Our digital vs electronic signature guide explains where the line falls.
Will my saved signature look the same on every document?
That's the point of saving it — you reuse the identical image, so it's consistent across every document you sign. Re-drawing each time is what produces the inconsistency.
How do I get a clean signature image from paper?
Sign on plain white paper with a dark pen (a fine marker beats a ballpoint — thicker lines scan better). Photograph it in even light with no shadow across the page, then enhance it to force the background to true white before uploading.
Can I add more than one signature to a document?
Yes — place as many as you need, wherever they need to go. Useful for multi-page contracts that want a signature or initials on each page.
Can I sign a password-protected PDF?
Not directly. Unlock it first, sign it, then re-protect it if it needs to stay secure.
The signature has a grey box around it.
That's the background of your uploaded image. Re-scan or re-shoot it on white paper in even light, or run it through Enhance PDF to whiten the background before uploading.
Wrap-up
- Open Sign PDF and click Add signature.
- Draw, Type, or Upload — upload gives the most authentic result if you scan it cleanly.
- Place, size, and flatten before sending.
- Signed in? It's saved for next time.
The whole point is to do the work once. Get a signature you're happy with, save it, and every future document is a matter of placing it. For the full signing walkthrough, see our Sign PDF guide.