Sign PDF
Sign PDF files online for free. Draw, type, or upload your signature, place it on your PDF, and download the signed document securely.
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Max file size: 50 MB
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Secure
Your files are transferred and processed securely over encrypted HTTPS.
Fast
Sign your PDF documents in seconds with our high-performance servers.
Easy to Use
Simple and intuitive interface makes signing PDFs easy and quick.
Sign PDF Files Online
Use MarsPDF to sign PDF files online for free. Our browser-based editor allows you to easily draw, type, or upload your signature and place it anywhere on your PDF documents. Simply upload your PDF, customize your signature layout, and download your signed file securely. No registration or software installation is required.
Whether you need to sign a lease agreement, approve a project proposal, or fill out a business form, MarsPDF makes the document signing process fast, secure, and completely private directly inside your web browser.
How to Sign a PDF
Upload Your PDF
Select or drag and drop your PDF document into the dropzone to load it into the editor.
Place Your Signature
Draw, type, or upload your signature, and place it. You can also add text, initials, or dates.
Download Signed PDF
Click "Apply Signature" to process your document and download your securely signed PDF.
Draw, Type, or Upload Your Signature
MarsPDF offers multiple ways to sign your PDF documents based on your preference:
- Draw: Use your mouse, trackpad, or touchscreen to draw a natural-looking signature directly on the canvas.
- Type: Enter your name or initials and choose from elegant font styles (cursive, serif, or sans-serif) to instantly generate a clean signature.
- Upload: Upload a scanned image of your physical signature (JPG, PNG) and place it on the pages.
Add Text, Initials, and Date
Apart from the main signature block, you can overlay helper text layers on your PDF pages. Place your initials (e.g., in the footer corner of each page), add custom text boxes for comments or filling forms, and drop the current date stamp with a single click.
When Should You Sign a PDF Online?
Signing documents online saves time and resources. Instead of printing a page, signing it with a pen, scanning it, and emailing it back, you can complete the entire process digitally in seconds. It is ideal for office correspondence, rental agreements, purchase orders, waiver forms, and school documents.
Important Note About Electronic Signatures
MarsPDF lets you add a visual signature to a PDF document. This is useful for forms, approvals, and everyday documents. It is not a certified digital signature service or a qualified electronic signature (QES) solution.
If you require cryptographic validation, certificate authority (CA) audits, or government-level legally binding digital signatures for high-risk contracts or financial documents, you should use a dedicated qualified e-signature provider.
Secure Online PDF Signing
Your privacy and document security are fully guaranteed. All files uploaded to MarsPDF are transferred and processed securely over encrypted HTTPS connections.
We do not store, copy, or read your PDF documents or signatures. All rendering and custom visual additions are processed locally in your browser memory and securely compiled by our workers.
Frequently Asked Questions
Is the Sign PDF tool free to use?
Yes. You can sign your PDF files online for free directly in your web browser.
How can I draw my signature?
Choose the "Draw" tab under Signature Options, select your ink color and brush size, and draw using your mouse, trackpad, or touchscreen.
Can I add initials and dates to the PDF?
Yes. You can place signature blocks, initials blocks, date stamps, and custom text inputs anywhere on any page.
Are my files and signature images safe?
Yes. Your files are transferred over secure HTTPS encryption. We do not store or keep your signatures or documents.