--- title: What does PDF Header Signature Not Found error message mean? description: What does PDF Header Signature Not Found error message mean? --- [Skip to content](https://support.bundledocs.com/knowledge/what-does-pdf-header-signature-not-found-error-message-mean#main-content) [![Bundledocs Logo](https://support.bundledocs.com/hs-fs/hubfs/Bundledocs%20Logo-1.png?width=204&height=30&name=Bundledocs%20Logo-1.png)](https://www.bundledocs.com/) Open main navigation Close main navigation How can we help you? - There are no suggestions because the search field is empty. 1. [Help Centre](https://support.bundledocs.com/knowledge?hsLang=en) 2. [Frequently Asked Questions](https://support.bundledocs.com/knowledge/frequently-asked-questions?hsLang=en) # What does PDF Header Signature Not Found error message mean? ## The error message PDF Header Signature Not Found typically indicates that the file being processed is either not a valid PDF or has been corrupted during upload. It is possible to fix this error document by printing the document to pdf and reuploading.  1\. After generating your bundle, go to ![](https://support.bundledocs.com/hs-fs/hubfs/Download%20and%20Distribute-png-Jul-15-2025-03-35-29-3662-PM.png?width=23&height=20&name=Download%20and%20Distribute-png-Jul-15-2025-03-35-29-3662-PM.png)**Download and Distribute Bundle**, which is the 4th icon located at the top of your bundle. ![](https://support.bundledocs.com/hs-fs/hubfs/image-png-Jul-15-2025-03-36-33-8558-PM.png?width=670&height=377&name=image-png-Jul-15-2025-03-36-33-8558-PM.png) 2\. Click ![](https://support.bundledocs.com/hs-fs/hubfs/Download-png-1.png?width=20&height=20&name=Download-png-1.png)**Download.** ![](https://support.bundledocs.com/hs-fs/hubfs/image-png-Jul-15-2025-03-40-43-6847-PM.png?width=670&height=377&name=image-png-Jul-15-2025-03-40-43-6847-PM.png) 3\. Once your bundle is downloaded, click the **printer** icon at the top right corner. ![](https://support.bundledocs.com/hs-fs/hubfs/image-png-Jul-15-2025-03-43-37-9000-PM.png?width=670&height=377&name=image-png-Jul-15-2025-03-43-37-9000-PM.png) 4\. Select **Microsoft Print to PDF** as the printer destination and then click **print**. ![](https://support.bundledocs.com/hs-fs/hubfs/image-png-Jul-15-2025-03-46-44-6196-PM.png?width=670&height=441&name=image-png-Jul-15-2025-03-46-44-6196-PM.png) 5\. Save the document to your device. ![](https://support.bundledocs.com/hs-fs/hubfs/image-png-Jul-15-2025-03-50-37-7467-PM.png?width=670&height=116&name=image-png-Jul-15-2025-03-50-37-7467-PM.png) 6\. 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