How to sign a PDF without printing it

Open the PDF in PDF InkPad by dropping it onto the sheet, choosing it from your device, or pasting it from the clipboard. The pages appear in a rail on the left; the first page fills the workspace. Nothing has been sent anywhere at this point — you can confirm that by opening the browser's network panel, or by turning Wi-Fi off before you start.

Press Sign in the toolbar. The first time, a dialog asks you to draw, type or upload a signature; it is saved to the library and placed on the current page. Drag it onto the signature line, pull a corner handle to size it, then add a Date field next to it and Initials wherever the document asks for them. When every page is done, press Download signed PDF. The file you get is named after the original with “-signed” appended, and the original on your disk is untouched.

A mouse is a poor pen. If you are at a desk, the most natural signature usually comes from a phone: open the site there, turn the phone sideways so the drawing area is wide, sign with a finger or a stylus, and tick “remember on this device” only if the phone is yours. Then either finish the document on the phone or photograph a paper signature for the laptop. The drawing pad smooths the stroke, so slight wobble from a fingertip disappears; sign at a normal speed rather than slowly, because slow strokes wobble more.

Typing your name works when a legible signature matters more than a personal one — internal approvals, forms that will be re-keyed anyway. Two script faces are offered, both with Cyrillic, and the result is rendered to an image at the moment you save it, so it is identical every time you place it.

If you already have a signature image, its background decides whether it looks signed or pasted. A JPEG or a photo has an opaque white (or grey) rectangle around the ink; placed over a signature line it hides the line and any text under it. A PNG with an alpha channel has no background at all, so the ink sits on the page like a real pen stroke.

You do not need an image editor to fix this. Upload the JPEG or photo and leave “make the white background transparent” ticked: every pixel close to white becomes transparent, dark ink stays, and the in-between tones become semi-transparent so the edges stay smooth. It works best on a photo taken in even light on plain white paper, without shadows from your hand. If the paper was cream or the photo dim, retake it near a window rather than fighting the result.

A signature line on an A4 or Letter page is usually 180 to 250 points wide (a point is 1/72 of an inch; the page itself is 595 points across). A signature that is 120 to 170 points wide and 35 to 60 points tall fills such a line the way a pen would. The tool places a new signature at about a third of the page width; drag a corner to adjust, and the aspect ratio is kept automatically. Let the bottom of the ink rest on or just above the line — real signatures cross the line slightly, and that is fine.

Text and date fields default to 12 points, which matches the body text of most forms; a 10-point field suits dense tables. Because the same Noto Sans font is used on screen and in the exported file, the width you see is the width you get. Use the arrow keys for one-point nudges when you are lining a date up with printed text, and Shift with an arrow for ten points.

Leases, purchase agreements and anything with a schedule attached often ask for initials on each page, to show that no page was swapped later. Create your initials once (the dialog has a Signature / Initials switch), then place them from the library on page one, check the badge on the thumbnail, move to the next page with PageDown or the rail, and repeat. Keep them in the same corner at the same size on every page; consistency is what a reviewer looks for.

Dates are where cross-border documents go wrong: 03/04/2026 is 4 March in one country and 3 April in the next. The Date field fills in today's date with the month spelled out in the current language, which cannot be misread, and you can edit it to any wording the document uses. If the form has a printed “Date:” label, place the field right after it rather than on a line of its own.

Open the downloaded file in a different viewer than the one you signed in — the browser's built-in viewer, Preview on a Mac, Acrobat Reader on Windows — and page through it. The page count should match, every signature and initial should be where you left it, and the original text should still be selectable, which proves nothing was flattened to an image. Zoom to 200% on a signature: a drawn one is stored at twice its screen resolution and should look smooth.

Then compare file sizes. A signed copy is normally the original plus a few hundred kilobytes at most: the signature PNGs and a subset of the font. If the file did not grow, the fields were not written; if it grew by megabytes, you uploaded a photo the size of a poster and should re-import a smaller one. Finally, keep both the unsigned original and the signed copy; the pair is your evidence that only the signature block changed.