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How to Sign PDF Documents Online for Free (No Login)

Updated: Jan 26, 2026 | By Scan4U Team

In today's digital world, printing, signing, and scanning documents is a waste of time and paper. Whether you need to sign a contract, an invoice, or an application form, Scan4U allows you to do it directly from your browser—securely and for free.

Why Use Scan4U for e-Signatures?

Unlike other tools that require you to create an account or pay for a subscription, Scan4U is completely free. Plus, it processes your files locally on your device, meaning your sensitive documents never get uploaded to a server.

Step-by-Step Guide

Step 1: Upload Your PDF

Go to the Scan4U Signature Tool and click on the "Upload PDF" button. Select the file you want to sign.

Step 2: Add Your Signature

You have two options:

Step 3: Clean Background (Magic Feature)

If you uploaded a photo, it likely has a grey or white background. Click the "Clean BG" button to instantly make it transparent. You can also use the "Auto" button to enhance the ink color automatically.

Step 4: Download

Place the signature where you need it, resize it using the corners, and click "Save PDF". Your document is ready!

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Conclusion

Digital signatures are legally recognized and save a lot of time. With Scan4U, you get a premium experience without the premium price tag.