Sign any PDF Document with our Free Online Signature Creator

Using our free PDF signature tool, you can easily create and certify any document. No additional software is needed.
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Upload your PDF

Sign pages in your PDF without effort. Upload any document to AltoSign or drag and drop it into the box. No downloads required.

Certify PDF

Easily add a legally binding e-signature to your document online. Draw your signature with a mouse, touchpad or type in your first and last name.

No Payments

Our solution is one of the best services available. It has no limitations or required payments. You can also sign as many documents as you need for free.

Secure File Transfer

No need to worry about your data privacy. It is 100% protected. All files are certified in a secure environment and removed from the system after you refresh the page.

Device Compatibility

Sign any document using any smartphone or computer that is connected to the internet. It works well on any device regardless of the browser or operating system you use.

Converting files in the cloud

We process your files in the cloud. Rest assured your device’s storage and memory resources won’t be affected.


File extension .pdf
Internet media type application/pdf
Description: PDF is a Portable Document Format. It was designed to unify the process of exchanging files and make it independent of hardware, software and operating systems. As opposed to other formats, PDF keeps the initial document structure unchanged. You can sign PDF documents enhance them with audio and video elements.
Technical Details: PDF is an electronic documents format, that does not depend on any operating system, software or hardware. It looks the same on any device. PDF viewer is all you need to open PDF documents. There is huge amount of such programs. Some of them provide tagging, word search and text editing.
Developed by ISO
Initial Release: 15 June 1993
Useful links:

How-to guide

How to sign the pages of a PDF document online

  1. Open in your web browser.
  2. Click "Choose Files" to upload PDFs stored on your device.
  3. Once the document is uploaded, click "Sign".
  4. Type in your full name to sign the document with a handwritten font style.
  5. Draw your signature using the mouse or trackpad.
  6. Upload the image of your signature from your device.
  7. Capture your signature using your camera.
  8. Scan a QR Code to draw your signature on your mobile device.

How to Make a Digital Signature for Free

Digital certification is gaining more and more popularity by the day. A major reason is that now, an electronic signature is meant to be just as legally binding as any handwritten signature.  

But sometimes it's difficult to find a solution that's right for you. Most services that offer e-signing require that you choose a paid plan or that you provide sensitive information.

We decided to take a different approach with our platform. For example, there's no need to download any programs or provide any personal information.

With our service, you can easily create an electronic signature free of charge. 

  • There is no need to register or provide any information. All operations you make are completely anonymous. This saves you time and guarantees additional security. This also ensures that you won't receive any annoying spam or advertisements.
  • Your file is always secure. The platform is equipped with data encryption methods, as well as the latest security measures available. 
  • You can use our platform as many times as you want and for as long as you want. Everything is completely free. 
  • The cloud-based toolkit helps to add your initials to the document without installing any additional software. This way, you can certify your PDF without using up your device's memory. Additionally, this platform will be compatible with any browser installed on your computer or mobile phone. All you need is a stable internet connection.

How to Electronically Sign a PDF

With our solution, you get the opportunity to digitally certify the sample in just a few short easy steps:

1) To electronically sign a PDF, you will need to upload the template to the website. This can be done in three ways:  

  • add a file from the inner storage of your mobile phone or home computer;
  • use the cloud storage (Google Drive, DropBox, OneDrive) available on the website and import your template from it;
  • drag and drop the file to the upload box. 

2) Usually the upload takes a minute or two. It depends on the file size and the stability of your internet connection.

3) You then need to add your initials to the corresponding page which contains the signing box. Type in your first and last name. Then, select the font style you will be using. Your certification will look as if it were drawn with wet ink.

4) It's possible to draw your autograph with a mouse or touchscreen (it depends on the device that you're using). This method will make your e-signature appear even more natural.

5) After the e-signature is created, it will be resized in order to both fit the page and keep a natural look. Then simply submit your changes and place the box with your autograph in the needed area. Your signature will look just as if it were handwritten. 

6) After performing these operations, you can then download your document. Make sure you save it to your device’s internal storage because it will be removed automatically. This is to provide an additional level of data security. 


An E-signature is a broad concept that covers numerous types of certification. It can be supported by graphics, sounds or consist of a combination of symbols. It helps to certify different variants of documents, agreements, money transfers, bank operations, etc. E-signatures are both legal and accepted by private and governmental institutions the same way as handwritten ones.

Did you know?

Type on your signed PDF

It's unavoidable, especially in a business-oriented environment, that you may need to modify a PDF document. And this typically requires a more advanced solution than a regular Reader. Our online editor allows you to not only sign documents electronically, but also to modify your text, relocate pages, insert, resize and move images, and much more. The solution copes perfectly with any task, regardless of the device you use.