Sign PDF Online Free
Sign PDF online for free. Add a signature image, position and resize it on the page — processed in your browser, no upload, no signup.
Drop PDF here
or click to select files
Max 100 MB per file
Drop signature image here
PNG with transparent background works best
Max 100 MB per file
Last updated May 2026
Pro Tip
For the best results, use a PNG signature image with a transparent background. You can create one by signing on white paper and using an image editor to remove the background.
How to Use PDF Signature Tool
1
Upload Your PDF
Drag and drop your PDF file into the upload area, or click to browse and select a file from your device.
2
Upload Signature Image
Upload an image of your signature. PNG files with transparent backgrounds work best for a professional look.
3
Position and Size
Adjust the horizontal and vertical position, as well as the size of your signature on the last page.
4
Sign and Download
Click the sign button to add your signature and download the signed PDF document.
Why Use Our PDF Signature Tool?
Precise Positioning
Adjust horizontal and vertical placement with sliders.
Adjustable Size
Scale your signature to the perfect size for your document.
Transparent Signatures
PNG images with transparency blend seamlessly with content.
100% Free
No hidden charges or premium features locked behind paywalls.
Privacy First
Files are processed in your browser and never uploaded to servers.
Works Everywhere
Compatible with desktop, tablet, and mobile browsers.