Safe and secure

Quick and easy

No email


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
Show more

How to guide

How to Use the Online PDF Converter

  1. Select any of the options on the AltoPDF main page (Sign, Merge, Convert PDF to JPG or other).
  2. Upload a document from your device or import it from Google Drive, Dropbox or OneDrive.
  3. Apply all actions you need to convert or modify the document.
  4. Edit a newly-created document in the free online editor if needed.
  5. Save, download or share the document.

The Ultimate Features Comparison Chart

Choosing the best application can be challenging. To make the best choice, you need to compare the features of different applications. Our checklist will help you quickly find the right tool to work with PDF documents. Check out the features of AltoPDF.

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



Awesome converter! I can experiment with my documents using various options, combining them to get the file I need. No more trouble with unsuitable formats. I get the right one in a matter of seconds.



The best PDF converter I’ve ever come across! All-in-one solution! Extract, merge, split, convert to images and back… even e-signature is available. Everything’s on the table and for free.



I used to convert my PDF documents with other tools, but now that I found AltoPDF everything has become simpler. I can’t think of any drawbacks.

Your opinion matters!

If your experience was picture-perfect, please take a moment to tell us so.

How to Work with a PDF Online

Different paid software for converting PDFs is available online, but it’s vital you make the right choice. We’ve collected the best free features for you in one place.

Upgrade Your Skills to View & Edit PDFs

Many contracts and documents are signed electronically and saved in PDF because the format tends to be more secure. However, this means that viewing and editing PDFs can become complicated. See the advanced features of our powerful web-based tool that can satisfy all your requirements:

  1. Split PDFs into separate documents or pages.
  2. Merge several documents into a single one.
  3. Rotate pages and select a horizontal or vertical position.
  4. Work across your storage clouds.
  5. View and edit documents on the go.
  6. Combine and reorder files. 
  7. Compress PDF papers for quick sharing and better storing.
  8. Manage your paperwork instantly and for free.
  9. Delete or extract the pages you need.
  10. Rest assured your information is protected.

All-in-one online service has the most common tools for working with a portable document format. All of them are free, with no registration required. Drag-and-drop functions make the process even more comfortable. This powerful browser application allows you to view, organize and process PDF documents and pages.

BackgroundUpgrade Your Skills to View & Edit PDFs


AltoPDF is a free online platform that allows manipulations with PDF files. One of its significant features is that you can import files from Google Drive and once they are processed, export them back. The service allows converting of Word, PPT, JPG and PNG files fast, free, safe, easy and retaining the quality of the original document.