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File extension .pdf
Internet media type application/pdf
Description: PDF or Portable Document Format is a universal file extension developed in 1993 by Adobe Systems, is one of the most popular document format. It is used by corporate users as well as by individuals. That’s because with PDF you don’t need to worry about how your files look once they are printed or opened with another program.
Technical Details: PDF format allows you to save fonts, images, and the layout of the original document, regardless of the application it was created with. PDF format is recognized global standard in the field of replication and exchange of securely protected electronic documents and forms. PDF files are small and self-contained and supports links (inside document or web page).
Developed by ISO
Initial Release: 15 June 1993
Useful links:


Save more time and sign documents online

How to sign the pages of a PDF document online

In the modern world of constant ruch, every minute is valuable. Our service respects your time and wants to give you the ability to sign PDFs for free. We don't create long and complicated workflows. You can forget about installing software, completing registrations, or having to buy subscriptions of any kind. All you need for certifying your docs is your computer or smartphone and an internet connection.

How to sign documents online

  1. Upload a document to the service from your device or the cloud. 
  2. Choose a page(s) that you sign.  
  3. Click the Add Signature button at the top right corner. 
  4. Use your stylus, finger, or trackpad to draw your signature in the pop-up window.
  5. Select Save and Use
  6. Drag and drop it where you need it to go; adjust its size and color if required. 
  7. Select Finish and export the doc by clicking Download Now

You can also transfer a doc right to the cloud. Just click the Google Drive, OneDrive, or Dropbox icons and access your signed files online. It’s simple and all there is to everything you need to know about how to sign a PDF file. In addition to our servers' latest encryption features, we clear all your data right after closing the browser tab or starting a new process, so feel free to click Start over again and certify as many documents you need! AltoSignPDFFree is at your disposal.

Watch this video on how to sign documents online 

AltoSignPDFFree is the best platform where you can immediately certify your documents. Open the service, upload a doc, and place your signature. If you prefer more detailed instructions, we prepared a short video on how to sign a PDF for free. Watch it now!

The Ultimate Features Comparison Chart

As a result of the high level of competition on the web, choosing the best application can be challenging — especially if you don’t correctly compare it with the alternate options. Our checklist will help you quickly find your favorite tool to SignFree. Look at the strong features of AltoSignFree.

View & edit
Split PDF
Merge PDF
Combine & Reorder
Extract Pages
Compress PDF
Rotate PDF
No software downloads
Cloud storage Unlimited No info No info
Price Free Free 7-Day Trial paid Free 7-Day Trial paid
Encryption and security
Support 24/7/365 No info
No ads

Customer Reviews — Trusted by great people

⭐ ⭐ ⭐️ ⭐️️ ⭐️

Whenever I need to submit my tax forms I use AltoSignPDFFree because it takes a couple of seconds to get a completely legal document. One less thing to worry about!



⭐ ⭐ ⭐️ ⭐️️ ⭐️

The best web-based service for creating signatures online. It’s absolutely safe because the previous documents are removed after reloading the page. Once I forgot to save a doc I just signed, left the site came back and had to do it again. It actually gave me a lot of confidence in AltoSignPDFFree.



⭐ ⭐ ⭐️ ⭐️️ ⭐️

For me personally, security is number 1. This tool is cloud-based so I don’t have to worry they might get access to the documents stored in my devices.



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How to Digitally Sign a PDF

With this solution, you can effortlessly certify a document using any device connected to the Internet. Just visit the web-service and effortlessly certify any PDF!

How to add a Signature to a PDF Online

The best way to digitally certify a document is by processing it via a web-based service. What makes these solutions so effective is that they are easy to access from any device. And electronic initials are easily created with the AltoSignPDFFree solution. You don’t need to undergo the process of registration or make any annual/regular payments. The process goes by quickly, smoothly and without any problems. As a final result, you get legally binding, handwritten-like initials.

Complete the process by doing the following:

  1. Drag and drop the template to the website. Add it from your device’s memory or include files from the cloud.
  2. After the document is uploaded, it will be available for further signing.
  3. Create your certification by drawing it or add a picture of it written on paper. Place it in the appropriate cell on the page.
  4. Complete the changes and save the certified file.

The Alto platform doesn’t have access to any information included in the document. 

Both original and final docs are removed from the service right after you reload the page or start a new operation. That is why we highly recommend saving the certified file right after the process is completed. Also, the solution is based fully in the cloud. This means that nothing stored in your device will be accessed. This platform is the perfect choice for both long and short-term use.

BackgroundHow to add a Signature to a PDF Online

How to Sign a PDF in Chrome

Digital certification is gaining more popular by the day. And those who neither want to install programs or visit an online-based website can use a Chrome extension to do this. The Alto Signature Creator is a tool that integrates with Chrome and lets you create certification right from the browser. It’s secure and helps you easily create digital initials without installation of any expensive programs. It also greatly simplifies the process of adding your initials to a document.

Add your signature by following these instructions:

  1. Open the Chrome Web Store. Add the Alto Sign extension to Chrome.
  2. Use your browser to preview the document.
  3. Add your certification to it and save the changes.
  4. Download your file or save it to Google Drive.

Alto Sign is one of the best services available - thanks to its fast installation and robust integration with your browser. It easily accelerates the digital signing process. With this solution, anyone can process docs and be assured that all files are fully secure. Just insert your initials in the document and it will have a legally binding signature. In addition to looking the same as if it were handwritten, this signature makes your templates look neat and professional. It is a free and superior alternative to paid software.

BackgroundHow to Sign a PDF in Chrome

How to Certify a PDF on Windows

Windows doesn’t have any default solutions for editing documents in PDF format. It only allows you to open PDFs for preview - using the default browser or any other browser you prefer to use. That’s why if you want to certify a document, you will need to install a new program or visit an online service. It’s better to install software from the MS store. It is one of the most secure services available and it provides licensed software that is safe for your computer. 

Simply find the needed solution and install it to your device.

Complete the document signing process by following these simple steps:

  1. First open the solution and add your PDF.
  2. Create your certification.
  3. Place the signature in the corresponding area of the page.
  4. Save the document you edited to your computer.

By installing a signature creator on your Windows-based computer, you will immediately save yourself time and accelerate your file processing. Also, it’s independent of an internet-connection and has high-security measures. You have the option to choose services with multiple features or a single-feature creator. Be ready for the fact that some software may require you to be online if you want to synchronize your data. These services may also require registration or be free of charge - but only during the trial period.

BackgroundHow to Certify a PDF on Windows

How to Add a Signature to PDFs with Mac Preview

Mac computers have pre-installed programs, like Preview for example. It easily opens PDF documents to make content easy for previewing. It can rearrange pages and combine the pages of several PDFs into one. This solution can also certify documents, although not all users are aware of this feature. You can find this feature hiding in plain sight in the main toolkit. Additional tools become visible after you click on the pen symbol.

The certification process goes by quickly and smoothly when you follow the recommendations given below:

  1. Go to Preview to open the file.
  2. Click on the pen logo and you will see a panel with additional options.
  3. Choose the icon with initials and a pop-up window will appear.
  4. Draw your signature using the touchpad and submit the changes.
  5. Add your initials to the needed area of the page. 

With Preview, you don’t need to install any additional software or make any payments. It comes with the OS by default. The certification created with this service will look the same as if it were written on paper. Additionally, it is fully secure and safe. Remember, you should not provide your personal information to any third-party solutions. You can also use this solution in offline mode, so you can process your files with it at any time.

BackgroundHow to Add a Signature to PDFs with Mac Preview

How Can I Sign a PDF in Adobe Reader?

Adobe Reader DC is a widely known solution used by numerous individuals and companies worldwide. This software can be installed on Windows computers, Mac computers, Android-based mobile devices and iPhones. It has the registration procedure as the first step after it is downloaded and launched. Right after you create an account, start your free trial period. It lasts for a week and some options are limited until you pay for a subscription. You can either select a subscription plan and make a payment or use the service with limited features. Unfortunately, certification is available only for the paid plan.

To complete the process of signing a PDF template with Acrobat, refer to the directions given below:

  1. Start by opening the program and add your document to it.
  2. Go to the upper right-hand toolbar and click on the Sign icon.
  3. Next, you will see a pop-up window.
  4. Tap on the signature icon and specify what way you would like to add your certification.
  5. Create the signature. Draw it, type it or add its photo.

To install the program, visit the official Adobe website to install the licensed software. 

This solution, in its full version, synchronizes information from all devices to make all the changes in the documents up to date. When connected to the Internet, it has access to all the files saved in Adobe Document Cloud. Still, you can edit docs while offline and all changes will be updated once your connection is renewed.

BackgroundHow Can I Sign a PDF in Adobe Reader?

How to Sign PDF for Free on the Phone

Most of the services that offer you e-signing solutions for PDFs for free on smartphones or desktops have hidden issues that only get solved after paying for a subscription. Sometimes you will run into problems with signing, the quality of your files, platform watermarks and much more. You need a solution that’s free, effective and secure. Get AltoPDF. Easily sign a PDF for free without any difficulties. Follow this guide to create an e-signature with reliable service while using your smartphone or other devices: 

  1. Search for 
  2. Tap the orange Choose File button. 
  3. Click Add Signature in the top right-hand corner, 
  4. Draw your new e-signature in the new window that pops up. 
  5. Select Save and Use
  6. Drag&Drop your e-signature to the right place and tap Finish
  7. Hit Download Now or use more editing options by pdfFiller. 

There are a variety of different reasons to use AltoPDF instead of other 'free' services. 

First, we guarantee the security of your signature and other information. We transfer all the data with encrypted channels. We also follow all US and EU security guidelines. 

Second, the quality of your files stays high after all uploads and downloads. We don't ever reduce the quality of your files. 

Third, we don't ask for your email, credit cards or phone numbers. We don't create a watermark or any other signs on your documents.

Our service is entirely straightforward and honest. All we want is to satisfy your document flow needs. 

BackgroundHow to Sign PDF for Free on the Phone

How to Sign PDF on iPhone for Free

Nowadays, signing PDFs is not a luxury but a need. People file their taxes, sign contracts and agreements online. People are even e-signing PDFs from their iPhones for FREE. All you need is a web browser and a good connection to the internet. Follow these steps:

  1. Go to in Safari or any other browser. 
  2. Upload a file from a cloud storage (click on icons) or your device (tap Choose File). 
  3. Tap Add Signature in the right-hand corner of the screen. Draw your e-signature in the pop-up window. If required, cancel changes, adjust colors, then tap Save and Use
  4. Drag&Drop your e-signature to where it needs to be. 
  5. Select Finish
  6. Tap Download Now to save the sample or try advanced portable document format managing options with pdfFiller by tapping Sign & Secure

Signing documents online gives you more opportunities. It makes all the processes much faster. Say goodbye to running around the city to get your documents signed! If you use the Alto platform, it saves even more money, because it's FREE, and you don't have to pay for paper.

If you need to convert your files before signing, merge or split them, you can do it with other options available on Reach all of them from your iOS and Android devices. 

BackgroundHow to Sign PDF on iPhone for Free

How to Sign PDF on Android for Free

Android users have access to hundreds of applications for portable document format files. And guess what? For many, that’s not only a blessing but a curse too. However, with AltoPDF, e-sign from a browser rather than with a useless app that you’ll uninstall after a few months anyway. Go to and complete the following instructions: 

  1. Open the website. Hit the orange Choose File button and browse for your sample. 
  2. Tap on Add Signature and create yours with your finger in the window that appears. 
  3. Click Save and Use to close it and place your-signature in the correct place.
  4. Repeat these actions if more than one e-signature is required. 
  5. Tap Finish. When the process ends, select Download Now
  6. Try pdfFiller if you want more options for professional-looking samples. 

Using the AltoPDF platform is one of the easiest ways to sign a PDF on Android for free. If you like to use this service, please add it to your bookmarks and come back each time you need to e-sign your documents. 

You can also use it to edit, protect, convert or compress your samples. Find the whole list of functions at the bottom of this page or go to 

BackgroundHow to Sign PDF on Android for Free


What is an Electronic Signature?

An electronic signature is a unique type of certification that is gaining worldwide popularity. Its standard format looks like a traditional signature written on paper. Also, this certification may be combined with graphic signs, biometric data (e.g. fingerprint) or encrypted code. Those types of signatures can be used separately or together to increase security.