Online PDF Converter

Convert, split, merge, edit and sign your PDF documents online without registration.

What is AltoPDF

A multi-purpose online solution for managing files in PDF format. Use the app to convert any file to and from PDF in seconds. Drag and drop a PDF file you wish to convert into the box or upload it from your hard drive. Browse the toolbar and choose the feature that suits you the most.

Export to and From PDF

AltoPDF is a universal converter which enables you to discover the benefits of PDF format. Easily process documents, graphs, diagrams, sideshows and images. Split, merge, compress, protect and unlock any PDF file, rotate pages in a document and perform many other procedures without effort.

Edit PDFs Online

AltoPDF is an advanced web-based platform for editing PDF files. It combines an intuitive user-friendly interface with a powerful toolkit and helps you resolve the most challenging tasks. Our users are able to access a range of up-to-date instruments for free and apply them to their documents online.

Secure Data Processing

AltoPDF provides its customers with highest standards of data safety. Every file you upload is processed via a secure connection and stored on an encrypted offsite server. As soon as you finish editing your document and close the app, it is automatically deleted from the server.

Supported File Formats

AltoPDF supports a range of popular file formats. In fact, you can always choose the format which suits you the most. Upload documents in PDF or MS Word (DOCX) format, images in JPG or PNG format, and PowerPoint slideshows (PPTX), and save the resulting file to your device in one click.

Manage Documents On the Go

The app doesn’t require downloads and installations. By processing files online, you save your device’s memory resources as well as free space on your hard drive. AltoPDF is compatible with any desktop and mobile device and works equally well on both Windows PC, Mac or Linux.

File format  

Format File format name Programs that use this format  Author
doc Microsoft Word Binary File Format Microsoft Word (97-2010)
Apple Pages
Microsoft Word
IBM Lotus Symphony
docx Microsoft Word Open XML Document  Microsoft Word 2013
Corel WordPerfect X7
Apple Pages 5.2
MobiSystems OfficeSuite Pro 7
Google Drive
pdf Portable Document Format Adobe Viewer
Acrobat Reader
Adobe Systems
pages Pages Document Pages 4.0
Pages 4.1
Pages 4.2
iWork '09
Google Docs
Apple Inc.
jpg Joint Photographic Experts Group JFIF format Adobe Photoshop
Adobe Suite
Apple Preview
Corel Paint Shop Pro
Microsoft Office
Microsoft Windows Photo Gallery Viewer
Most web browsers
Joint Photographic Experts Group 
 jpeg Joint Photographic Experts Group JFIF format Adobe Photoshop
Corel Paint Shop Pro
Apple Preview
Microsoft Windows Photo Gallery Viewer
The JPEG Committee
png Portable Network Graphics Microsoft Windows Photos
Microsoft Paint
Adobe Photoshop CC
PNG Development Group (donated to W3C)
csv Comma Separated Values File Microsoft Excel
Microsoft Works
Corel Quattro Pro
Apache OpenOffice
Microsoft Notepad
Libre Office
MobiSystems OfficeSuite Pro 7
 xlsx Microsoft Excel Open XML Spreadsheet Microsoft Excel 2007
Open Office
Oxygen Office Progessional (Linux)
numbers Numbers Spreadsheet File Apple Numbers (Mac, Web & iOS) Apple Inc.
ppt Microsoft PowerPoint Presentation File Apple Keynote
Microsoft PowerPoint
 pptx  Microsoft PowerPoint 2007 XML Presentation Apple Keynote
Microsoft PowerPoint
html Hypertext Markup Language with a client-side image map Internet Explorer
Mozilla Firefox
Google Chrome
Other internet browsers
World Wide Web Consortium & WHATWG
url Internet shortcut file Apple Safari
Google Chrome
Microsoft Internet Explorer
Microsoft Word
Mozilla Firefox
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Customer Questions and Answers

I am looking for a way to edit a PDF that my boss sent me. But since the data in it is quite confidential, I want to be extra careful. Is there a reliable and secure online solution that I could use?
I think you should try There’s a whole bunch of useful instruments you can apply to your PDF document for free. Moreover, this site uses encrypted servers to store data and protect your files from any unauthorized access. Just go and try it and you won’t regret it!
By William on June , 2018
Hi there! I’m not an expert at working with PDF files and I need a simple but powerful PDF editor for home use. Any suggestions?
Answer: is definitely the best choice available online. It’s both powerful and simple enough. The interface is very intuitive and user-friendly. Not once did I feel confused about how to use their instruments. I use it both for my work and for personal stuff too.
By Jason on May 21, 2018
I’m almost out of storage space on my hard drive. Is there any convenient online tool I could use to edit PDFs that doesn’t require installation? Thanks!
There is one web tool I know that suits your requirements. You can upload your PDFs to and edit them online. All you need is a stable internet connection! No downloads required!
By Carl on May 16, 2018
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Customer Reviews

Great work, AltoPDF! I’ve tried a dozen of PDF document management platforms, both paid and free, and none of them beats this one. It’s simple, accurate and secure. Switching between PDF and other popular document formats have never been this easy!
I simply love this app. It contains a whole bunch of online converters as well as a web-based editor for quick and painless document processing. With AltoPDF, I’m able to compete all kinds of PDF-related operations with a flick of my finger.
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Convert, Improve and Edit PDFs

This online PDF converter makes it possible to manage documents and convert them to and from PDF format. Forget about the numerous programs, installations, registrations, and payments. Everything you need to work with PDFs you will find in this single, web-based platform. And it's absolutely free of charge. Besides, you can use it whenever you want and from any device. The clear interface, high level of data protection, powerful tools, and advanced features — all of these are specially designed for your convenience! You have many tasks — we have one solution, with a wide range of great tools!

How to Convert PDF Files

Converting a Word, Excel, or PowerPoint file into a protected PDF

Encountering troubles with email inboxes, hacked databases or stolen private account information isn’t uncommon. Users of cloud storage services pose have a right to be concerned over the safety of their account information. Another valid concern has to do with the measures that should be taken in order to protect a user’s most sensitive information.

The PDF document has been designed to present and exchange files reliably, independent of software, hardware and operating system. As opposed to other formats, PDF preserves the original look of the document while enabling file sharing. Whether you print or view it, the PDF will always look the same. That’s why it is so widely used by businesses, agencies and organizations that prefer commercial printing methods. But how can a user quickly extract needed information if it is contained in another document format? Use a PDF converter.

Now you can edit PDF documents from such popular formats as Word, Excel or PowerPoint. Use powerful online tools to avoid annoying downloads and installations. Easily convert pdf to powerpoint, convert Word to PDF and other formats. If you want to place data from a PDF document into a spreadsheet, use an online pdf converter to excel.

Experience the benefits of a pdf to word document conversion:

  • Simply upload your files by dragging and dropping them into the box on the screen and rearrange your files in whatever order you prefer.
  • There is no need to make any payments or purchase any additional software.
  • Take advantage of encrypted file transfer. Everything that you process is highly protected. Encrypted connections provide secure transmission of your information. All data is deleted after downloading your converted document.
  • No matter whether you prefer Linux, MacOS or Windows, you can make changes in any browser with any internet-connected device. Finally, converting files in the cloud doesn’t consume storage on your computer. Use the application wherever you need.

How to guide:

How to use the online PDF converter:

  1. Type in your web browser address bar.
  2. Within the app, select the operation you wish to perform with your PDF and choose the respective column (i.e. Manage PDF, Convert, or Office & PDF).
  3. Select the desired tool from the menu by clicking on it.
  4. When redirected to a new page, upload a file from your device or import it from Google Drive, Dropbox or OneDrive.
  5. Follow the prompts to process your file online.
  6. Choose what else you want to do with the resulting file. Download it back to your device or save it to your cloud storage service account.
  7. Edit your documents online using the web-based PDF editor.
  8. Share the resulting file via Email, Fax or SMS.


How to Convert Scanned Documents/Images to PDF

Converting scanned documents and images into PDF format can be done via highly protected means. Protect your documents with two-factor authentication in your Encrypted folder. To activate the Encrypted folder follow the steps below:

  1. Click the protected folder in your MYBOX and enter your cell phone number. You will immediately receive an activation code via text message.
  2. Enter the activation code and click Verify to create a password.
  3. Create and confirm your password to open the folder.
  4. To add documents to the Encrypted folder, drag them from any other folder.
  5. Once you’ve finished working with your protected documents, close the Encrypted folder by clicking the key icon. It will also automatically lock after 10 minutes of inactivity.

To access documents in the Encrypted folder, you will have to enter your password again.

Did you know?

Your PDF becomes an interactive form

Convert documents to PDF from the most popular formats and edit PDF with an extensive toolbar. Place fillable fields anywhere on a document and make it possible for other users to fill, sign, and submit your document. Insert dropdown menus, lists, checkbox fields, etc. Any field you create can be easily moved, resized or deleted. Import images, arrows, bookmarks and sticky notes.