How to sign a PDF without printing it

Printing a form, signing it, scanning it and emailing it back is slow, and it is rarely necessary. Most PDFs can be signed on screen in a couple of minutes. What is less clear to many people is whether the result counts: whether a typed name, a drawn squiggle or a pasted picture of a signature is accepted. This guide explains the main ways to sign a PDF, the difference between a simple electronic signature and a digital signature, when UK law accepts them and where it asks for more, a step by step method, and the habits that keep your signature from being misused or your document from being sent back.

By Valtrinity. Updated 18 October 2026.

Three ways to put a signature on a PDF

The simplest method is to type your name in a signature field or text box, usually in a script-style font. It is quick and legible, and it is acceptable for many everyday documents, though it carries little visual authority.

The second method is to draw your signature with a mouse, trackpad, finger or stylus, and place the result on the document. On a phone or tablet, drawing with a finger works well. The third method is to use an image of your handwritten signature, taken by signing on white paper, photographing or scanning it, and cropping closely. The image can be placed on any document and resized.

A fourth, different category is the digital signature, which uses a certificate to lock the document so that any later change is detected. This is a stronger form of electronic signing, usually provided by a signing service or a business system. Most day-to-day forms do not need it.

Are electronic signatures valid in the UK?

In general, yes. UK law, including the Electronic Communications Act 2000 and the UK rules on electronic identification, recognises electronic signatures, and the Law Commission confirmed in 2019 that an electronic signature is capable of being a valid signature for most documents, provided the person intended to sign and any formalities are met.

What matters is intention and evidence. A typed name or drawn mark can be a valid signature if the signer meant it as one. If a dispute arises, the question becomes how you prove who signed, so records such as the email thread, the date and time, and the file itself are useful.

Some documents have extra rules. Wills have formal requirements about signing and witnessing, and electronic signing is not generally valid for them under the law at the time of writing. Deeds can be signed electronically in some cases, but there are rules about witnesses. Certain property, lending and court documents also have their own procedures. When a form is important, check the requirements with the organisation asking for it, or take legal advice.

Step by step: signing a PDF on screen

First, open the PDF and find where the signature belongs. Look for a labelled line, a field or a box marked 'Signature'. If the document has form fields, fill them in as you go, because some can be locked once signed.

Second, create your signature. Type it, draw it or load an image, depending on the tool. If you use an image, make sure the background is white or transparent and the cropping is tight, so it looks natural on the page.

Third, place and resize it. The signature should sit on or just above the line, at a size similar to handwriting, not stretched. Add the date and printed name if the form needs them. Then save the signed copy under a new name, for example the original name plus the word signed, and keep the original in case you need to start again.

Signing on a phone or tablet

Most phones can sign a PDF without any extra software. Open the file from the email or the files app, choose the markup or sign option, and draw with your finger. Phones often let you save a signature to reuse, which is convenient but means anyone with access to your unlocked phone could sign as you, so use a screen lock.

Zoom in before placing the signature, so that you can see the line clearly, and check on the full page afterwards that it has not moved. Small screens make it easy to drop a signature a line too low.

If you have a form with many pages, check that you have signed every page that needs it, as well as initialled where asked. Missing one is a common reason for a form to come back.

Mistakes that get a form rejected

The first is signing the wrong place, or leaving a field empty. Read the whole form before you start and tick off each required field. The second is using a signature that looks too different from the one on your records. For forms that are compared against a known signature, such as some bank documents, try to match it.

The third is flattening or saving in a way that loses the signature. After you sign, open the saved file again and check it. A signature that vanishes when the file is opened in another program is useless. The fourth is sending the form at low quality. A compressed signature may be too faint to read, so check at full zoom.

The fifth is signing before the content is final. Once signed, the document should not change. If you need to change a number, do it before you sign, and if the other party changes it afterwards, sign again.

Keeping your signature from being misused

A picture of your handwritten signature is easy to copy. Do not post it online or send it where it is not needed, and do not keep it in a shared folder. If you only sign occasionally, create it when you need it rather than saving it for ever.

When you sign a document, you can reduce the risk by adding the date and the purpose, such as 'Signed for the tenancy agreement dated 1 March 2027'. This makes it harder to reuse the signed page on a different document. Some people add a line across any unused space on the page for the same reason.

Be wary of requests for a signature that come from an unexpected source, and of documents with blank sections to be completed later. Never sign a form with fields left empty. If you are asked to send a signed blank page, ask why first.

Related jobs after signing

Once the PDF is signed, you may need to make it smaller to email, combine it with other documents, or put pages in the right order. Compressing a signed PDF is fine for most purposes, but check that the signature is still clear afterwards, and use the original if the recipient needs full quality.

Merging a signed form with supporting documents into one file makes life easier for the recipient. Put the signed page first or follow the order they asked for, and name the file clearly with your name and the purpose.

Finally, keep a copy of the signed document and the message you sent it in. If a question arises months later, you will have the record.

Tools mentioned in this guide

Frequently asked questions