How to Add a Signature to PDF - Complete Guide 2026
Adding signatures to PDF documents is simple. You can sign forms online without installing software. Our platform detects signature fields automatically and lets you draw your signature directly in your browser.
How Do I Add a Signature to a PDF?
Upload your PDF. Our AI detects signature fields automatically. Click any signature field to open the signature pad. Draw your signature using your mouse or touchscreen. Click Done to save. Your signature appears in the PDF immediately.
You can also add signature fields manually if the AI misses them. Click Add Field and select Signature. Position the field where you want it. Then sign it using the same process.
How to Add Digital Signature Block to PDF
Digital signature blocks are fillable fields where signatures go. Our platform creates these automatically when processing your PDF. The AI identifies signature areas and converts them into interactive fields.
To add a signature block manually, click Add Field in the form editor. Choose Signature from the field type menu. Click where you want the signature block on the PDF. The field appears as a highlighted box. Click it to sign.
Signature blocks work on any device. Use your mouse on desktop. Use your finger on tablets and phones. The signature saves as an SVG image. It embeds directly into your PDF when you download.
How to Put a Signature on a Document
Open your PDF in our form editor. Find the signature field. It appears as a highlighted box labeled Signature. Click the field. A signature pad opens in a modal window. Draw your signature using your mouse or touchscreen. Click Done when finished.
Your signature saves automatically. It appears in the PDF immediately. You can edit it anytime by clicking the field again. Click Clear to remove your signature and start over.
Download your signed PDF when ready. Click the Download button. Your signature embeds permanently in the PDF. The signed PDF works with any PDF reader.
Step-by-Step Signature Process
Step 1: Upload Your PDF
Drag and drop your PDF file or click to browse. We support all PDF formats. Scanned documents work too. Processing takes under 30 seconds for most files.
Step 2: Review Detected Fields
Our AI automatically finds signature fields. They appear highlighted on your PDF. Review the detection results. Add missing fields if needed. Remove incorrect detections.
Step 3: Click to Sign
Click any signature field. The signature pad opens. Draw your signature using your mouse or finger. The pad supports touch input for mobile devices. Clear and redraw as many times as needed.
Step 4: Save and Download
Click Done to save your signature. It appears in the PDF immediately. Fill other form fields if needed. Click Download to get your signed PDF. The signature embeds permanently.
Can I Add Multiple Signatures?
Yes. Add as many signature fields as you need. Each field works independently. Sign each one separately. This works great for contracts and forms requiring multiple signers.
Create signature fields for each person. Position them where needed. Each person can sign their own field. Download the PDF when all signatures are complete.
What Devices Work for Signing?
All devices work. Desktop computers support mouse input. Tablets and phones support touch input. No special hardware required. Works in any modern browser.
Chrome, Firefox, Safari, and Edge all work. Mobile browsers work too. The signature pad adapts to your screen size automatically.
Can I Edit My Signature?
Yes. Click the signature field again to reopen the pad. Your existing signature loads automatically. Clear it and draw a new one. Click Done to save changes.
Signatures save as you work. Changes update immediately. You can edit signatures anytime before downloading.
Is My Signature Secure?
Yes. Signatures save securely. Files process with encryption. We delete uploaded files automatically after processing. No permanent storage. Your documents stay private.
Signatures embed directly in the PDF. They work offline after download. No cloud storage required. Complete privacy guaranteed.
Do I Need Special Software?
No software required. Everything works in your browser. No downloads or installations. No Adobe Acrobat needed. No plugins or extensions.
Our platform works entirely online. Upload, sign, and download. That's it. Much simpler than traditional PDF software.
How Does This Compare to Adobe Acrobat?
Our platform is faster and easier. No software installation. No digital ID setup. No certificates required. Just upload and sign.
Adobe Acrobat requires expensive software. It needs complex setup for digital signatures. Our platform works instantly. No learning curve. No technical knowledge needed.
Try our signature tool and see the difference. Free to use. No registration required.
Can I Sign Scanned PDFs?
Yes. We support scanned documents. Our OCR technology detects signature fields in scanned PDFs. Upload your scanned document. The AI finds signature areas automatically.
Sign scanned forms just like regular PDFs. The signature process works the same. Download your signed scanned PDF when done.
What File Formats Work?
PDF files of all versions work. Scanned PDFs work. Image-based PDFs work. We convert everything automatically. No format conversion needed on your end.
Upload any PDF and start signing. The platform handles format differences automatically. You focus on signing, not technical details.
How Long Does Signing Take?
Signing takes seconds. Upload your PDF. Wait for field detection. Click the signature field. Draw your signature. Click Done. That's it.
Most documents process in under 30 seconds. Large files may take up to 5 minutes. A progress indicator shows status. You'll know exactly when it's ready.
Can I Save My Signature for Reuse?
Currently, signatures are saved per document. Each PDF stores its own signatures. This ensures signatures match the specific document context.
Future updates may include signature templates. For now, draw your signature fresh for each document. It only takes a few seconds.
Troubleshooting Signature Issues
Signature Field Not Detected
If the AI misses a signature field, add it manually. Click Add Field. Select Signature. Click where you want it. Then sign as normal.
Signature Looks Blurry
Signatures render at high resolution. If blurriness occurs, try drawing larger. Use more of the signature pad space. Larger signatures scale better in PDFs.
Can't Click Signature Field
Make sure field detection completed. Check the processing status indicator. Wait for all fields to load. Then try clicking the signature field again.
Signature Not Saving
Click Done after drawing. The button enables when you have a signature. Make sure you drew something before clicking Done. Clear and redraw if needed.
Best Practices for Signatures
Draw clearly. Use the full signature pad space. Larger signatures look better in PDFs. Take your time. You can clear and redraw as many times as needed.
Review before downloading. Check that signatures appear correctly. Make sure all required fields are signed. Download only when everything looks good.
Legal Validity of Digital Signatures
Digital signatures are legally binding in most countries. The United States ESIGN Act recognizes electronic signatures. Many other countries have similar laws.
Our signatures create a visual representation of your signature. They show intent to sign. For highly sensitive documents, consult legal advice about signature requirements.
Next Steps
Ready to add signatures to your PDFs? Upload your first document and try it now. No registration required. Free to use. Start signing in seconds.
Need help with other PDF tasks? Check our guides on creating fillable PDFs and PDF field detection.