Sign PDF: free online, fast and secure
Printing a document just to sign and scan it wastes time and paper. With this tool you can sign PDFs on your phone or computer: draw your signature with a finger or mouse, type your name in a handwriting style, or upload an image of your real signature.
Place the signature on any page, drag it into position, resize it and add it to several pages if needed. The signature is drawn into the PDF so it appears in every viewer.
How to use Sign PDF
- Upload the PDF. Choose the document to sign.
- Create your signature. Draw, type or upload it, and choose the ink colour.
- Place and download. Pick the page, press “Place signature”, drag it into position, then download.
Why use ConvertKaro Sign PDF? Free, fast and secure
There are many Sign PDF websites, but most of them upload your files, add watermarks or ask you to pay. Here is why this one is better.
100% Free
Sign PDF on ConvertKaro costs nothing. There is no trial, no premium plan and no hidden limit, so you can use it as often as you like.
Fast results
Because nothing travels to a server, results appear almost instantly. Large files are limited only by the speed of your own phone or computer.
Secure and private
Nothing is uploaded. Sensitive files like Aadhaar, PAN, salary slips or contracts stay on your own phone or laptop the whole time.
No signup, no watermark
No account, no email and no watermark on your result. Open the page and start.
Works on every device
Designed for mobile first, so it works just as well on your phone as on a desktop computer.
Draw with your finger
The signature pad works smoothly on touch screens, so signing on a phone feels natural.
ConvertKaro vs other online converters
| ConvertKaro | Typical online tool | |
|---|---|---|
| Price | Free forever, every feature | Free trial, then paid plans |
| Your files | Stay on your device | Uploaded to a server |
| Signup | Not needed | Often required |
| Watermark or ads on result | Never | Common on free plans |
| Speed | Instant, no upload wait | Depends on upload speed |
| Daily limits | None | Usually limited |
Common uses for Sign PDF
- Signing offer letters and joining forms
- Rental and lease agreements
- Vendor and client contracts
- School and college consent forms
- Invoices and delivery receipts
Tips for the best results
- Use dark blue ink; it looks like a real pen signature.
- Upload a PNG with a transparent background for the most realistic look.
- Double-click a placed signature to remove it.
- Lock the result with Flatten PDF or Protect PDF.
Good to know
PDF (Portable Document Format) was designed so a document looks the same on every device and printer. That reliability is why banks, courts, universities and government offices prefer it. A PDF can contain real text, vector graphics and images, and it can be protected with a password or signed. Sign PDF works directly with the PDF structure in your browser, so pages keep their original quality unless you choose an option that converts them to images.
| Price | Free, no limits |
|---|---|
| Processing | On your device, no upload |
| Signup | Not required |
| Watermark | None |
| Works on | Android, iPhone, Windows, Mac, Linux |
| Category | PDF tools |
How Sign PDF keeps your PDF documents private
Most online converters upload your file to their server, process it there and send it back. That costs time, uses your data pack and means a copy of your file sits on someone else’s computer. Sign PDF works differently: the page loads the tool into your browser, and your PDF documents are processed by your own phone or computer. The file never travels over the internet, so it cannot be leaked, stored or misused.
Using Sign PDF on your phone
Sign PDF is designed for small screens. Buttons are large, options are simple, and downloads save directly to your phone storage. On iPhone, downloaded files appear in the Files app under Downloads; on Android they go to the Downloads folder.
Who uses Sign PDF?
Here are some of the people who find this tool most useful:
- Students submitting assignments, certificates and mark sheets
- Job seekers sending resumes and documents
- Accountants and office teams handling invoices and statements
- Small businesses preparing quotations, bills and catalogues
- Anyone filling government, bank or insurance forms online
Supported input: PDF files of any size and page count, including scanned PDFs.
Frequently asked questions
Is this a legal digital signature?
It is an electronic signature image, accepted for many everyday documents. Some legal and government filings require a certified digital signature (DSC) or Aadhaar eSign.
Can I sign multiple pages?
Yes. Place the signature on as many pages as you need.
Is my signature stored?
No. It exists only in your browser and the PDF you download.
Is Sign PDF really free?
Yes. Sign PDF on ConvertKaro is 100% free with no limits, no signup and no watermark. There is no paid version.
Is it safe to use Sign PDF online?
It is one of the safest ways to do it, because nothing is uploaded. All processing happens locally on your device, and the files disappear when you close the page.
Does Sign PDF work on mobile?
Yes. It works in Chrome and Safari on Android phones and iPhones, as well as on tablets and computers. No app is needed.
Is there a file size limit in Sign PDF?
No upload means no server limit. The only limit is your device’s memory, which comfortably handles everyday files and even large batches.
Will ConvertKaro add a watermark or ask me to sign up?
No. There is no watermark, no login and no email required. Your downloaded file is exactly your result.
Does Sign PDF work offline?
Once this page has finished loading, the tool keeps working even if your internet connection drops, because all processing happens on your device.
Related free tools
People who use this tool often need these too: Flatten PDF, Protect PDF, Add Page Numbers to PDF, Watermark PDF, Merge PDF.