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

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 AltoPDF.com and edit them online. All you need is a stable internet connection! No downloads required!
By Carl on May 16, 2018
I need a program that allows me to convert a photo taken of my handwriting into an editable PDF file. Is this even possible?
Sure. Actually, you need to first convert your JPG or PNG image to the PDF format. You can do this accessing the AltoJPGtoPDF or AltoPNGtoPDF service. Once the converting process is finished, click the Continue editing button and change the text of your PDF document using the extensive toolbar.
By Helen on February 01, 2018
Is there a cheap program out there that can help me edit PDF files?
In case you need to change your PDF documents in a quick and cheap way - access the AltoPDF platform. It helps you to convert, merge, split and rotate your PDF files as well as edit them using various tools.
By Joshua on March 18, 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 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.