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File conversion failed due to invalid content that could not be read

Andrei Dinu

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I am also unable to convert files that used to convert easily. The following message is the reason: file conversion failed due to invalid content that could not be read

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  • Official Nitronaut
Allain Umailin

Hello @Andrei Dinu,

Thank you for reaching out to us through our Community Forums!

For the sake of initial troubleshooting of this conversion issue, we recommend that you repair your Nitro Pro. Please reboot your computer before and after running this repair to ensure that there are no ties to Nitro still active in the background. You may refer to this article: https://kb.gonitro.com/knowledgebase#/search/repair/000004603 

If Modify button is greyed-out, please refer to this screen-cast that will teach you on how to go to Control Panel > All Control Panel Items > Programs and Features and repair your Nitro Pro program or any application installed on your system:

If repairing didn't help and in order to further assist you, could you please provide the following?:

-The serial number of your Nitro Pro. This matters because our business installers are different from the online ones.
-Build of Nitro Pro are you working with. You can find this out by clicking on 'About Nitro Pro' under the Help tab (format is 13.X.X.X, e.g. or you can go to Control Panel > Programs and Features.
-Does this happen with every file? If it is a single file, please send us the sample file (with sensitive information extracted).
-Where are the files saved (local, a shared drive or an external drive) when you are trying to convert? Can you check if you have the same issue when the file is saved locally?
-A screen shot of the error message you are receiving and/or any important information. To find out how to take a screen shot using Snipping Tool, check out this link: https://support.microsoft.com/en-us/windows/use-snipping-tool-to-capture-screenshots-00246869-1843-655f-f220-97299b865f6b

To send them via private message, hover your mouse on top of my name 'AllainU' and select 'Message'.

Thank you very much in advance and I am looking forward to hearing back from you. 

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I have attached the license and the error when I try to convert pdf to word or excel.If you need any more information .... please let me know.


Thank you and have a nice dayNitro.jpg.f3de2a213927f4a7f8313530196b002a.jpg475532972_Nitroerrorconvert.thumb.jpg.c4d6e34e7b0e981a098abd1c2dfc366e.jpg

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Allain Umailin

Hello @Andrei Dinu,

Thank you for the private message.

Since you are still working with an older build of version 13, let us try some troubleshooting by referring to these steps:

1. Clear the content of the directory under C:\users\your_username\Appdata\local\temp. For whatever reason, not all temp files automatically remove themselves and is NOT usually caused by Nitro Pro files. Kindly note Appdata folder is hidden and to unhide it, please refer to this article https://cybertext.wordpress.com/2012/05/29/cant-see-the-appdata-folder/ 

2. Download and run our Clean Up utility to uninstall your Nitro Pro:  http://install.nitropdf.com/professional_13332645/install-cleanup/install-cleanup.zip

NOTE: This clean-up tool will erase any existing signature files within Nitro so please save them to another location before using the clean-up tool in order to keep them. Please see this link for backing up custom stamps/signatures: https://kb.gonitro.com/knowledgebase#/search/stamps/000004307 

3. Clear all your downloads folder or delete all downloaded Nitro installers. This step is important because we noticed that if you are saving all the installers and you download them in the same folder (like the downloads folder), the EXE can pick up any MSI installer in that folder and you may pick-up one of the older builds instead of the newly downloaded package.

4. Download and install Nitro Pro 13.33 using below offline installers:

x32 http://install.nitropdf.com/professional_13332645/en/retail/nitro_pro13_ba_x86.msi
x64 http://install.nitropdf.com/professional_13332645/en/retail/nitro_pro13_ba_x64.msi

To know if you have 32-bit or 64-bit, please refer to this article:

5. After installation, you can activate by opening Nitro Pro, clicking on the Help tab > About Nitro Pro > Activate by entering your serial number.


After updating to our latest build which is 13.33, try converting again your PDF file to Word. 

To get best results for PDF to Excel conversions, please refer to the following tips:

1. Contents in the PDF document should best resemble a table with consistent spacing in rows, columns, and headings.
2. The document should not contain extraneous text and content around the actual table in the PDF as this will attempted to be read in the conversion to Excel.

Please allow me to add these extra notes for scanned documents:
1. Ensure the document is upright (text reads left to right, up and down).
2. Scan the original image with a higher DPI or quality.
3. Ensure there is as little noise as possible on the document.
4. No handwritten content. Text should best resemble recognizable fonts on a computer.

I hope this helps. Please let me know if you need anything else.

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