PDF Converter: Edit and Sign PDF Documents in a Snap

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 extension .pdf
Internet media type application/pdf
Description: PDF stands for Portable Document Format. It is a versatile file format and extension developed in 1993 to simplify the procedure of viewing and printing documents and sharing them between users working on various platforms and operating systems. Another useful feature of PDF is that it combines features of both a text document and a vector graphic image. Each page of a PDF document has a fixed layout and retains its structure whenever it is copied or downloaded to another device.
Technical Details: PDF is a 7-bit ASCII file that contains the complete description of a flat vector document with fixed formatting. All the fonts used are stored within the file. These two features allow users to forget about missing fonts, misplaced elements, distorted graphics, etc. Along with text blocks and graphic images, PDF file may include fillable fields and interactive elements such as buttons, hyperlinks, bookmarks, embedded media, etc.
Developed by ISO
Initial Release: 15 June 1993
Useful links: https://whatis.techtarget.com/definition/Portable-Document-Format-PDF


Customer Questions and Answers

Hi all! I want to make some edits to a scanned PDF that contains both images, diagrams and text. How can I do this without diminishing the quality? Any online solution maybe?
Hello there! With altopdf.com you can edit your pdfs, convert them, move text blocks, add fillable fields and save files to your disk without losing any quality. It’s one hundred percent free and available from any desktop or mobile device.
By Sarah on May 01, 2018
What are the programs out there that can help me edit a PDF file? I'm looking for an online service.
You can convert your PDF file to Word format and edit it the way you need. Then convert the Word document to PDF format. The process is very simple in case you use the AltoPDFtoWord service. It runs independent of any type of software and OS and allows you to convert your documents from any internet connected device.
By Tashia on March 21, 2018
Looking for a user-friendly program or converter to edit a downloaded PDF file. Can anybody help me out here?
It doesn’t really matter if your file is downloaded or not. With AltoPDF.com you can edit any type of PDF document and convert it to other formats if needed. This is the best free online solution I’ve seen so far.
By Wayne on February 13, 2018
See All Question

How to Edit 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 AltoPDF.com 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.