How to Fix Kindle E999 Error? A Complete Guide
Shivansh Shukla
November 10th, 2025
Introduction: Isn’t it irritating when you try to send a file to Kindle and the pop-up or email comes with an E999 Error? Now, what’s next? The next step is to fix Kindle E999 Error. The Kindle E999 error is a common but vague gatekeeper that prevents perfectly good books from reaching your device. Therefore, in this blog, we have covered all the step-by-step optimal processes to fix this error. Alongside this, you will also get to know what the key causes for this are.
What Exactly Is the Kindle E999 Error?
Think that Amazon’s Kindle is a library. Plus, the Send to Kindle system is a highly efficient, but very particular, library curator. When you email a book, this curator inspects it thoroughly before placing it on your personal shelf.
The E999 error is the curator’s generic stamp of rejection. It’s not a specific complaint like this book is in the wrong language or the cover is torn. It’s more like a frustrated update that I can’t process this. Something is wrong.
In technical terms, E999 is a catch-all error code indicating that Amazon’s servers encountered an issue while parsing and converting your ebook file for Kindle compatibility. The file is, in some way, malformed or incomplete.
The best way to protect your Kindle data (EPUB) is to save it in different required formats. The MacSonik EPUB Converter easily converts EPUB files to PDF, DOC, JPEG, and over 10 other formats. With batch conversion and folder hierarchy preservation, it works across all Windows & Mac OS versions.
Why does the E999 Kindle Error Happen?
Before we dive into the solution to fix Kindle E999 error, it is very important to understand the causes of this error.
- Missing language metadata – File lacks the required language tag (most common cause)
- Invalid code – Broken HTML/CSS inside the ebook file
- Corrupted file – Damaged during download or transfer
- Unsupported formatting – Complex layouts, custom fonts, or unusual elements that Amazon can’t process.
Proven Ways to Fix Kindle E999 Error
This section will cover the tried and tested methods to solve this E999 issue. However, it’s a temporary error; still, we need the right approach to fix this. Try these quick techniques to fix Error999 – Send to Kindle Failing
1. Restart Your Kindle
A quick restart is the simplest and most effective fix for temporary software glitches (E999 send to Kindle Internal error epub).
Steps to Restart Kindle
- Press and hold the Power button for about 40 seconds until the screen goes blank.
- Then, release the button and let the device restart automatically.
- Once it’s back on, check if the error has disappeared.
2. Check Your Internet Connection
Poor or unstable Wi-Fi can interrupt downloads or syncing, triggering the E999 error.
Troubleshooting E999 via Internet Connection
- Ensure your Kindle is connected to a strong and stable Wi-Fi network.
- If you’re using mobile data (via the app), switch to Wi-Fi.
- Thereafter, restart your router or connect to a different network if the issue persists.
3. Sync Your Kindle Manually
Sometimes, Kindle loses connection with Amazon’s servers. A manual sync can fix Kindle E999 Error
How to Sync the Kindle Manually?
- Firstly, open Settings → Sync My Kindle.
- Then, wait for a few seconds while the device reconnects and updates your library.
- Once done, reopen the eBook or app to check if it works properly.
4. Remove and Re-Download the Problematic Book
A corrupted book file can also trigger this error. Resolving Kindle Internal Error E999 by removing & redownloading the book.
How to Remove and Re-Download a Book?
- From your Kindle’s home screen, long-press the book title and choose Remove Download.
- Go to Your Library on Amazon and re-download the same book.
- Once the download completes, open it again and check if the error is gone.
5. Update Kindle Software
Using an outdated software version may cause Kindle errors related to E999. Therefore, the update is the solution.
How to Update the Kindle
- Go to Settings → Device Options → Advanced Options → Update Your Kindle.
- If the option is greyed out, connect your Kindle to Wi-Fi and wait for the update to become available.
- Once updated, restart the device and verify the fix.
6. Clear App Cache or Reinstall Kindle App (for App Users)
If you’re facing this issue on the Kindle app (Android, iOS, or PC), it might be due to cached data or corrupted files. To E999 Kindle error reset, you just need to follow the steps below.
Steps to Clear App Cache or Reinstall Kindle App
- By opening Device Settings → Apps → Kindle → Storage.
- Tap Clear Cache and Clear Data.
- If that doesn’t help, uninstall and reinstall the app, then sign back in to your Amazon account.
7. Factory Reset Kindle
If none of the above methods work, a full reset may be necessary to fix Kindle E999 Error. This erases all downloaded books and settings, so back up your files first.
How to Factory Reset Kindle?
- Firstly, go to Settings → Device Options → Reset.
- Then, confirm when prompted and wait for your Kindle to restart.
- After reset, re-register your Kindle with your Amazon account and re-download your books.
These are the best troubleshooting steps for Kindle Error E999. These will ensure that you have a smooth experience with Kindle.
But in case you feel like you want to keep your data saved locally to protect it or for offline viewing. You can save your Kindle Data files to a more suitable file format, such as Word.
Kindle supports various file formats for eBooks and documents:
• AZW / AZW3 / KFX
• MOBI & PRC
• EPUB
How to Back Up Kindle Data (EPUB)?
The best way to protect your Kindle Data is to take a backup of this data. Here comes MacSonik EPUB Converter, which easily converts your EPUB files to PDF, DOC, JPEG, and 10+ other formats. Plus, this user-friendly tool preserves folder structure and supports batch conversion for multiple files at once.
Steps to Protect Your Kindle Data (EPUB)
- First, launch MacSonik EPUB Converter.
- Then, upload your EPUB files.
- Next, select PDF as your output format.
- After that, choose your destination folder.
- Finally, start the conversion process by clicking Convert.
Author’s Note
The Kindle Error E99 must not derail your reading experience. You can follow the seven solutions outlined above to fix Kindle E999 Error. Most problems stem from connectivity glitches, corrupted files, or outdated software, all of which are easily fixable.
Don’t forget to safeguard your digital library by converting and backing up your EPUB files in multiple formats. This ensures you’ll always have access to your books, regardless of device or platform. Now that you know how to tackle the E999 error, you’re equipped to handle future Kindle hiccups with confidence.
Frequently Asked Questions
Ans: The E999 error usually appears when Amazon’s server fails to process your EPUB file during conversion. This can happen due to missing metadata, corrupted file structure, or unsupported formatting. To fix it, check your internet connection, restart your Kindle, or try converting the EPUB file using a reliable tool like MacSonik EPUB Converter before sending it again.
Ans: Yes. Always make sure your Kindle software is up to date, your Wi-Fi connection is stable, and your files are properly formatted. Before sending an eBook, validate the EPUB file or convert it into a Kindle-supported format (like AZW3 or MOBI). Regularly backing up and organizing your files can also minimize such issues.
About The Author:
Shivansh Shukla is a technical content writer who researches and provides reliable solutions to help users resolve their problems. He offers effective procedures for email migration, data backup, and file conversion for all technical and non-technical users.
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