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Despite their many benefits, PDF files, short for Portable Document Format files, are vulnerable to corruption or any outside attack that damages them and prevents them from opening. As a PDF user, you might have come across error messages like “An error occurred while opening this document,”pdf is of invalid format for Android,”PDF files won’t open,” and “Adobe Reader cannot open the file because not supported,”PDF corrupted or damaged” and several others while trying to open the files. These error messages could be a concern because the damaged file would become unavailable and could result in the loss of crucial data. Therefore, PDF users must repair the damaged PDF files as soon as feasible. This repair can be done in just a few clicks using https://pdf.recoverytoolbox.com/online/  for any device and operating system (Android, iOS, macOS, Windows) and https://pdf.recoverytoolbox.com/ for Windows only.

Since PDF was introduced in 1990, users have been vocal about the ineffectiveness of Adobe’s PDF corrupt repair services. Adobe does not give users any particular free PDF repair software or a free online PDF repair service. They only suggest installing the latest version of Adobe Reader, which does not support editing, or Adobe Illustrator, which can be expensive to purchase, is challenging for beginners to learn, takes up a lot of space, and does not offer the necessary assistance. You may spend many hours looking for a solution on the Adobe Help and Support Website and be met with only this.

However, you can find offline and online solutions using the Recovery Toolbox for PDF, which enables you to restore damaged Adobe PDF documents.

Possible Causes of PDF file Corruption

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It can take time to pinpoint the exact cause of data-containing file damage. It could be due to a variety of reasons, including but not limited to:

Error Syncing Data in Your Adobe Cloud Folder on a Local Device.

The error occurs due to incorrect synchronization of PDF files between a computer, tablet, or phone and the cloud service due to connection failures, time setting failures, or wrong checksum verification.

Autosave Mode

Autosave is a feature that protects data in the event of a PDF reader program or system crash, power outage, or abrupt program termination. While a file is open, Autosave only creates a temporary safety cache file. Under normal circumstances, the Autosave temporary file is deleted as soon as it is closed, but files are sometimes not saved correctly due to an autosave mode malfunction.

Using Different Software to Open the Same File

Every software you use to open a PDF file makes a few minor adjustments to ensure that the file fits the software’s user interface. If you open the same file repeatedly with different applications, it may eventually undergo significant changes and become corrupted.

Problem with Hard Disks

Faulty hard drives have a significant impact on file loss or corruption. A minor crash can result in the accidental loss of some data.

The Encoding used by Email Service Providers.

Large files, including PDFs, may occasionally be encrypted by email service providers. However, they are not decoded on the receiving end, so they appear corrupt. It is advised to send large PDF files compressed to avoid this kind of failure.

The Mixed Page Orientation in a Saved File

The page orientation of a PDF file may be buried deep within the file. For instance, the PDF is displayed as 210 mm x 297 mm in portrait orientation when it is opened. However, the orientation is landscape somewhere in the file. While saving, the mismatched page orientation could corrupt the file.

Unreliable Internet Connection and an Unstable Power Supply

When downloading a pdf file, many errors could occur. Among these errors is an unreliable internet connection. Another possibility is the interruption of a download that was ongoing at the time.

The Online Solution: How to Recover a Corrupted File Online Using the PDF Online Repair Tool.

  1. Open the page https://pdf.recoverytoolbox.com/online/ in any browser and on any device (9 languages supported).
  2. Select a corrupt PDF file.
  3. Enter your email address – the program will send you an email with a notification about the recovery result in case the browser closes or the online connection is interrupted.


4. Click Next Step.


5. Upload your invalidly formatted document to the service, and the online PDF recovery process will analyze the contents of the Adobe Acrobat document. The Adobe Acrobat document’s correct information will be saved to a new file. The online service does not fix corrupt PDF files but creates a copy, extracting the maximum data from the document if the PDF is in an invalid format.

6. See what the PDF Online Repair Tool recovered when a PDF cannot be opened. The preview page includes information on how many and which objects were restored and saved. A gallery of screenshots of the recovered PDF file that will not open can also be viewed.

7. You can complete the online payment for the PDF file recovery service for as little as US$10/1GB by clicking Next Step.

8. Open the recovered Adobe Acrobat document in Adobe Reader or another PDF reader after downloading it.

The Offline Solution: How to Repair a Damaged PDF file with Recovery Toolbox for PDF.

1. Download the software Recovery Toolbox for PDF https://pdf.recoverytoolbox.com/.

2. Install the Recovery Toolbox for PDF on your PC.

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3. Select the damaged document on the first working page of the PDF fixer.

4. By clicking Next, you can analyze why the damaged PDF file won’t open in Adobe Acrobat.

5. Choose the PDF document’s version and save the Adobe document containing the recovered data.

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6. Choose whether or not to compress the data in the recovered PDF document.

7. Select a name for the recovered document.

8. Save the repaired PDF data to a new copy.

Bonus: How to Open a Corrupted PDF File for Free.

Recovery Toolbox for PDF allows you to open a damaged PDF file of an Adobe Acrobat/Adobe Reader document and display a list of objects and data found in the damaged PDF file on the program page.

Furthermore, the recovered data from an open PDF file can be exported to a new .pdf file, which you can work with in Adobe Acrobat/Adobe Reader or another program.


The Recovery Toolbox for PDF poses the following advantages, making it an excellent choice for repairing a corrupt pdf file.

  • All operating systems are supported, making it ideal for most hardware, including phones and tablets.
  • There is no file size limit, and all versions and sizes of PDF files can be restored.
  • It provides full support for PDF file recovery.
  • The ability to correct some logical errors caused by bugs in popular PDF generation software.
  • The recovered data is saved into a new, adequately formatted, compressed PDF file.
  • Allows you to save recovered data as compressed or uncompressed PDF documents.
  • It fixes compatibility with major Windows versions, including Windows 8 and 10.
  • It serves as a PDF Viewer Tool.
  • Displays and repairs a pdf file directly from Adobe Acrobat.
  • It provides an online service for recovering PDF files with minimal effort.


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