How to create an electronic signature

What an electronic signature actually is

An electronic signature is any electronic mark you apply to a document with the intent to sign — a drawn scrawl, your typed name in a handwriting font, or an image of your real signature. It is the digital equivalent of signing in pen, and under the US ESIGN Act and the EU eIDAS Regulation it carries the same legal effect as a handwritten signature for the vast majority of agreements.

Crucially, an electronic signature is reusable. Unlike a wet signature, which you re-create by hand each time, an e-signature can be made once and applied identically to every document afterward. The goal of creating one deliberately — rather than scribbling a fresh mark on each PDF — is consistency: the same recognizable signature on everything you sign.

The three ways to create one

There is no single correct method. Pick the one that fits your device and the look you want:

• >Draw it: sign with a mouse, trackpad, finger, or stylus. Best on a touchscreen or with a stylus, where the result looks naturally handwritten. The most personal option, though harder to keep identical between sessions unless you save the result as an image.
• >Type it: enter your name and choose a handwriting-style font. The fastest and most consistent method, and a valid electronic signature. Ideal on a desktop without a touchscreen and when you want a perfectly uniform signature every time.
• >Upload an image: photograph your real pen-on-paper signature and use it as a transparent PNG. The most authentic option, and the easiest to reuse identically once prepared.

Turning your handwriting into a transparent PNG

An uploaded image of your real signature gives the most authentic, reusable result — but only if you prepare it properly. Start by signing your name in dark ink on plain white paper, larger than you normally would. Photograph it from directly above in even, diffuse light, such as near a window out of direct sun, then crop the image close to the ink.

A photo on white paper carries a white rectangle onto any document behind your signature. The fix is to remove the background and save the result as a transparent PNG, so only the ink is visible over whatever is beneath it. On a Mac, Preview's Instant Alpha tool removes the background; on Windows, the background remover in Paint or any reputable online PNG background remover works. The finished transparent PNG is your reusable signature — store it where you can find it again.

What makes a good signature image

A few qualities separate a clean, professional signature image from one that looks off on documents. The ink should be solid and dark with good contrast against the original white paper, so it reads clearly at small sizes. The background must be fully transparent, with no grey halo or leftover white edges around the strokes. And the crop should be tight, with only a small margin of empty space around the signature so it positions neatly on a signature line.

Resolution matters too: capture the signature large enough that it stays crisp when scaled, but a typical prepared PNG of a handwritten signature is still well under 100 KB. Avoid JPEG for this — JPEG cannot store transparency and will reintroduce a background. PNG is the right format for a signature image.

• >Solid, dark ink with strong contrast for legibility at small sizes.
• >Fully transparent background — no white box and no grey halo around the strokes.
• >Tight crop with only a small margin around the signature.
• >PNG format, not JPEG, so transparency is preserved.

Choosing a typed signature font

If you type your signature, the font does most of the work. Choose one with a natural, slightly irregular handwriting quality rather than a stiff print or overly ornate calligraphy style — a signature that looks too perfectly uniform reads as typed, while a font with subtle variation looks more like real handwriting. Preview the font at the size you will actually use, since some fonts that look elegant when large become cramped and illegible when scaled down to fit a signature line.

A typed signature is fully valid legally; the ESIGN Act and eIDAS do not require a specific form. The advantage of typing is that the result is identical on every document with zero effort, which is exactly what you want from a reusable signature.

Reusing your signature across devices

Once you have a signature you like, the easiest way to reuse it everywhere is to keep a transparent PNG of it in cloud storage — iCloud Drive, Google Drive, or Dropbox. From any device — Mac, Windows, iPhone, Android, or a Chromebook — you can then upload the same image and get an identical signature, rather than re-drawing or re-typing each time.

If you prefer a typed signature, simply remember which font you chose so you can select the same one consistently. Either approach gives you a stable, recognizable signature that looks the same across every PDF you sign, which is part of what makes a signature credible over time.

Keeping your signature secure

Your prepared signature image is something to protect. Anyone with a copy of your transparent PNG could place it on a document, so store it the way you would store other sensitive personal files — in storage with access controls, not in a shared or public folder. Because a browser signer processes documents locally and never uploads them, creating and applying your signature does not expose the image to any third-party server; the only copy is the one you keep.

If you ever believe your signature image has been exposed, create a fresh one with a noticeably different style. Your handwritten signature can vary naturally, so a new capture is easy to make and re-establishes a signature only you control.