How to sign a PDF without printing it
To sign a PDF without printing it, open the Sign PDF tool, type your name or upload an image of your handwritten signature, drag it to the right spot on the page and download the file. This kind of signature is visual: it works for most everyday documents, but it does not replace a certificate-based digital signature, which some contracts and processes require.
Visual signature vs. digital signature: what is the difference
There are two kinds of PDF signatures and it is important not to confuse them. A visual signature is the one most people use day to day: an image of your handwritten signature, or your name typed in a cursive-style font, placed over the page. It shows who signed, but the file holds no technical proof that the content has not been changed since.
A certificate-based digital signature, such as those issued by accredited certificate authorities under ICP-Brasil, uses cryptography: the file records the signer’s identity and flags any later modification. It is required in court proceedings, in some contracts and in dealings with government agencies. ConverteJá’s Sign PDF tool inserts visual signatures; when your case requires a certificate, use a certification service.
When a visual signature is usually enough
Acknowledgment forms, simple statements, internal company forms, school permission slips, commercial proposals and contracts between parties who already know each other usually accept a visual signature. The practical test is to ask whoever requested the document: if the answer is "you can send it back signed as a PDF", a visual signature does the job. If the requirement is "signature with a digital certificate", it does not.
How to sign a PDF step by step
With the Sign PDF tool:
- Upload the PDF that needs to be signed.
- Type the signature as text or upload an image of your handwritten signature.
- Drag the signature to the right field, on any page, and adjust its size so it is in proportion with the lines of the document.
- Download the signed PDF and open the file to check that the signature ended up in the right place.
How to prepare a good signature image
Image quality makes a big difference to how the final document looks:
- Sign with a medium-tip black pen on smooth white paper.
- Photograph it in even light, without shadows, holding your phone parallel to the sheet.
- Crop the edges with Crop Image, leaving only the signature.
- Prefer PNG with a transparent background. With JPG, the white background can cover nearby lines and text.
Filling in the document before signing
Many documents ask for details before the signature. If the PDF has form fields, Fill PDF lets you type into them; if it is an ordinary document with no fields, Edit PDF adds text over the page. Fill everything in first and sign last: that way nobody needs to change the file after it has been signed.
Things to watch when returning the signed document
Always keep a copy of the original, unsigned file. When sending by email, consider protecting the PDF with a password using Protect PDF and share the password through a different channel, especially if the document contains personal data. And check the result: open the final PDF and make sure the signature is on the right page and in the right position before sending.
Frequently asked questions
Is a signature added to a PDF legally valid?
It depends on who requires the document. A visual signature (image or text) is accepted in many everyday situations, but processes that call for a certificate-based digital signature, such as ICP-Brasil, need a different kind of tool. Check with the recipient before sending.
How do I make an image of my signature?
Sign with a black pen on white paper, photograph it in good light and crop the edges. If possible, remove the background to get a transparent PNG, which will not cover the text of the document.
Can I sign the PDF from my phone?
Yes. The tool works in your phone’s browser: you upload the PDF, use the signature image or type your name, and position it with your finger.