Sign PDF Online — Add Your Signature to a PDF
Sign PDF documents online quickly and securely with SprinkleTools. Upload a contract, form, or agreement, create your signature, place it exactly where it belongs, then download a signed PDF.
Built on the same secure PDF editing pipeline as our editor, this focused signing tool is ideal for contracts, onboarding forms, approvals, and everyday documents that need a professional signature.
Drop your file here, or browse
PDF file · Max 10 MB free
Free account required
Create a free account to use this tool — no credit card needed. You'll get 40 free credits every month!
Private & Secure
Files encrypted in transit and automatically deleted after your session ends.
Lightning Fast
Cloud-powered processing means most files are ready in under 10 seconds.
100% Free
Free for files up to 10MB. No hidden fees, no watermarks on output.
Security & Compliance
SSL/TLS Encrypted
Encrypted in transit
Auto-Deleted
Files removed after session
Processed Securely
Secure cloud infrastructure
No Tracking
No ads, no data selling
How to Sign PDF
Upload your PDF file
Click the upload area or drag and drop your file. Multiple file formats are supported.
Choose your settings
Our system processes your file securely. Most conversions complete within seconds.
Download your PDF file
Your processed file is ready instantly. Click download and your file will be saved to your device.
Why use Sign PDF?
- Add a signature to contracts or agreements before sending
- Sign onboarding, HR, school, or government forms online
- Place signatures exactly where they belong on multi-page PDFs
- Resize and reposition signatures before saving
- Download a finished signed PDF without installing software
When should you use this?
- You received a PDF that needs your signature
- A contract or agreement must be signed and returned quickly
- You need to sign forms without printing and scanning
- Preparing a professional signed copy for email or upload
- Adding a signature to a document while keeping the PDF format
Is it secure?
Files Deleted After Session
Your files are automatically deleted when your session ends. We do not store, read, or share your documents.
Encrypted in Transit
All file transfers are protected with SSL/TLS encryption, ensuring your data is secure during upload and download.
Processed Securely
Files are processed on secure cloud infrastructure. No human ever accesses your documents during processing.
No Ads or Tracking
We don't serve ads, track your activity, or sell your data to third parties. Your privacy comes first.
Frequently Asked Questions
How do I sign a PDF online?
Upload your PDF, choose the Signature tool, draw or type your signature, place it on the page, then save and download the signed PDF.
Can I move or resize my signature?
Yes. After placing your signature, you can drag it, resize it, and position it precisely before saving.
Will the signature be saved into the PDF?
Yes. When you save, your signature is embedded into the downloaded PDF so it stays in place.
Is this secure for contracts and forms?
Yes. Files are encrypted in transit, processed securely, and handled through the same audited PDF pipeline used by the editor.
Do I need to print or scan anything?
No. The entire signing flow works online in your browser.
Related tools
Need larger files or batch processing?
Upgrade to Pro for 100MB files, batch processing, and priority speed — starting at $9/month.