Fix Dropbox Error 400 message on Windows 10

Dropbox is a cloud-based file storage service operated by Dropbox Inc. It allows you to store your personal files in an online cloud that can be accessed from various devices on which Dropbox is installed. Dropbox offers free plans with a set user limit and paid plans with more features and less restrictions. While Dropbox is popular and offers users free plans and better features, it is not without bugs and glitches. One of them is the Dropbox 400 error. Users have reported receiving a Dropbox 400 error message, which can be confusing because it doesn't quite explain the error and what we need to do to resolve it. If you are confused about this issue and searching the web, you are in the right place and in the right article. Here we discuss how to solve Dropbox error 400. Let's get started.

How to fix Dropbox 400 error message on Windows 10

Before we delve into the methods of solving the problem, let's look at some reasons why this problem occurs.

  • Microsoft runtime issues
  • Virus or malware
  • Conflicting Programs
  • Damaged installation
  • Legacy version of Windows

Method 1: Rename before uploading

Before uploading, try renaming the file to a different name and re-uploading to make sure that this prevents you from receiving the Dropbox 400 error message. Follow these steps:

1. Double-click Dropbox on your desktop.

2. Then rename the file you want to upload. Here we have renamed the platform-tools file to platform-tools123.

3. Now upload this file or folder to Dropbox.

Note. We have created a local folder on our device, so whenever we move a file to this folder, it is automatically uploaded to Dropbox. This is achieved using the Dropbox for Windows app.

Method 2: Update Windows

Windows update helps to update most of the outdated drivers on the system, which can solve the Dropbox error 400. Sometimes, incorrect configurations or files can be the cause of the problem. You can also fix errors on your computer and Dropbox by updating your operating system. Always make sure you update your Windows operating system, and if any updates are pending, check out our guide on how to download and install the latest Windows 10 update.

Method 3: Close conflicting programs

There is a possibility of Dropbox error 400 due to conflicting applications. Therefore, to get around this problem, read our guide How to end a task in Windows 10.

Note. Be careful not to terminate any system process. End only the process you know you have installed.

Method 4: Run a malware scan

The Dropbox error is due to many reasons, including failure to respond to user input, memory leak (Dropbox uses too much RAM, which slows down the system - this is incorrect code), and a runtime error. Most of these reasons are related to deletion of files, which can also be due to viruses or malware issues. Read our guide on how do I run a virus scan on my computer? and implement the same.

Method 5: Run Disk Cleanup

Insufficient disk space can contribute to the Dropbox error. You can fix the error using the built-in Windows utility called Disk Cleanup. Follow our guide on Disk Cleanup in Windows 10.

Method 6: Reinstall Microsoft Libraries

Receiving a Dropbox error message can also mean that there might be a runtime error. To work around this issue, you can uninstall the latest Microsoft Visual C++ 2015-2022 package. Follow these steps:

1. Press the Windows key, type "Control Panel" and click "Open".

2. Set View by Category, then under Programs, click Uninstall a Program.

3. Right-click the Microsoft Visual C++ Redistributable Package and select Uninstall.

Note. You need to uninstall the latest Microsoft Visual C++ Redistributable Package for x86 and x64.

4. Browse to the Microsoft Visual C++ Redistributable Package. download page and click the official link for Microsoft 2015-2022 Runtime Libraries.

Note. If your system is based on 32-bit Windows, download the x86 link and install x86 only. If your system is based on 64-bit Windows, download both x64 and x86 links and install both.

5. To find out what operating system you currently have, right-click This PC and select Properties.

6. Here you can view them on which architecture the operating system is running.

Note. If 64-bit is displayed, your computer supports both 64-bit and 32-bit files. On the other hand, if the 32-bit version is displayed, your computer only supports 32-bit installation files.

7. Double-click the installation file, check the "I agree to the license terms" box and click "Install".

8. After installation is complete, click Close.

Method 7: Reinstall Dropbox

The Dropbox error message could be due to a missing registry or a corrupted file in the Dropbox installation. You can try reinstalling the Dropbox app to resolve the Dropbox error 400 issue.

1. Find Control Panel in the search bar and click Open.

2. Set View by Category. Under the Programs heading, click Uninstall a program.

3. Right-click Dropbox and select Delete.

4. Follow the instructions on the screen to uninstall Dropbox.

5. Press the Windows + R keys at the same time to open the Run dialog box.

6. Enter %localappdata% and click OK.

7. Right-click on the folder named Dropbox and select Delete.

8. Now press the Windows key + R to open the Run dialog box again, type %appdata% and click OK.

9. Find Dropbox and delete the folder as you did earlier.

10. Launch the Run dialog, type %programfiles(x86)% and delete the Dropbox folder.

Note. If you cannot find the Dropbox folder, enter %programfiles% and delete the Dropbox folder.

11. Finally, visit the Dropbox official website and click "Download Now".

12. Click on the setup file to install Dropbox.

13. Click Yes on the prompt.

14. Sign in to your account to set up Dropbox on your device.

Pro Tip: How to Delete Connected Devices in Dropbox

There may be issues with the device or app you're signed into, whether it's an Android, Windows, or iOS device. You can remove all of these devices and re-login from the device that was experiencing the Dropbox error to fix the 400. Follow these steps:

Note. We have followed the steps in Google Chrome.

1. Go to the Dropbox official website and log into your account.

2. Click on the account profile picture in the upper right corner to open "Settings".

3. Now click "Settings".

4. Click the Security tab.

5. Scroll down and click the trash can icon next to the device you want to delete.

6. Now you can sign in to Dropbox using the device that caused the problem and see if it fixes it.

Frequently Asked Questions (FAQ)

Q1. What file types are allowed in Dropbox?

Answer There are no restrictions on the type of document or file type that a user can save, although there are restrictions for a regular user, which is provided free of charge, such as cloud storage up to a certain amount. place. A premium plan can access more space and benefits, which comes at a cost.

Q2. Is Dropbox a one-time payment?

Answer No, Dropbox is not a one-time payment service. This is a subscription-based service that the user must subscribe to if they want to use the Dropbox service. If a one-time payment is preferable, consider purchasing a hard drive.

Q3. Is Dropbox good and worth the money?

Answer Because Dropbox offers good upload and download speeds, it has a good service. Before buying, you can try the free service.


We hope that the above article on how to fix the Dropbox 400 error message was helpful and that you were able to solve your problem successfully. Please let us know which method worked for you. If you have any questions or suggestions, don't forget to mention them in the comments section below. Also, let us know what you would like to know next.

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