Sign a PDF on your phone

Printing a document, signing it with a pen, and scanning it back in is a massive waste of time. You can sign any PDF directly on your smartphone screen in seconds.

How to add your signature

1. Open your contract or form in Editrix PDF.
2. Select the Sign tool.
3. Draw your signature using your finger or a stylus. Editrix saves it securely on your device for future use.
4. Tap to place the signature exactly where it belongs on the page, and resize it to fit perfectly.
5. Save and share the signed document.

Two different things are called "signing"

The word covers two separate ideas, and knowing which one a document needs saves a lot of confusion.

• A drawn signature is a picture of your handwriting placed on the page. It is what most everyday paperwork expects, and it is what the steps above produce.
• A digital signature is cryptographic. It covers the file's bytes with a key, so any later change to the document breaks it and a reader can tell. It proves the file has not been altered since signing - something a drawn image cannot do, because anyone can copy a picture onto another document.

Editrix does both. Digital signing uses a key held in the Android Keystore, the hardware-backed store your phone already uses for payments and unlock credentials. The key is generated on the device and cannot be exported from it - not by Editrix, and not by us, because there is no server involved at any point.

Which one should you use?

For a rental agreement, a school form, an NDA or a delivery receipt, a drawn signature is normally what is being asked for and is accepted without question. Reach for a digital signature when the document's integrity matters - something that will be forwarded, archived, or relied on later, where a recipient may need to confirm it was not edited after you signed it.

On the legal side

Electronic signatures are recognised in most countries, but the details differ by jurisdiction and by document type, and some categories - wills and certain property deeds, for example - are commonly excluded. If the document is significant, check what your own jurisdiction requires rather than assuming. Editrix gives you the tools; it cannot tell you which one a particular document legally needs.

When another tool is better

If you need a full signing workflow - sending a document to several people, chasing them, and keeping an audit trail of who signed when - that is what Adobe Sign and DocuSign are for. Editrix signs a document you already have, on your phone, without uploading it anywhere.