Encountering Gmail Error 400? Know The Methods to Fix

We are all are familiar with Gmail services nowadays. Though Gmail is one of the best email service providers, it is also not free from technical glitches.

Causes Responsible for Gmail 400 Error- Know Briefly

Gmail error 400 mainly happens while the client and the requesting computer become unable to connect to each other. As well as if it failed to process your request then you might also get the same error code on your device. This issue clearly indicated that the server computer is unable to accept your request. Let’s start the causes in brief in the next segment.

  • Poor internet connection: In case you are connected with a poor or unstable internet connection then there is a high chance of getting this issue with their Gmail account.
  • Long HTTP header: If you notice the HTTP header is too long and increasing the communication time between the server and the client system then it might be equally responsible for this same error code.
  • Outdated web browser: If you are trying to log in your Gmail account from an outdated web browser then it is pretty possible that error code 400 may appear on your screen while sending an email through your Gmail account.
  • Accessing multiple accounts: While you are accessing more than two Gmail account at the same time it might create the same problem.

Once you get familiar with the cause its time to know the solution that will aid you to resolve it at the earliest.

Therefore, we will tell you some quick solutions to troubleshoot this problem. We shall make it easy to decide which solutions are simple to perform.

Fix Gmail Error 400 with these Quick and Easy-to-Apply Steps:

When you confront Gmail error 400, at first, check whether your Google Chrome internet browsing is working properly or not. Apart from that, if the traffic on the Google server or Gmail is not working properly, then you might face this error code.

Hence, if you found a similar kind of situation, then no need to worry as this page has brought some significant solutions in order to resolve the error code.

Simply, read this section below carefully and you can solve the issue within a short span of time.

Fix 1: Remove the Caches and Cookies  

An unnecessary accumulation of the cache files can slow down the function of the web browser. As a result, you might encounter error code 400 in your Gmail while opening it.

Hence, to overcome the error code completely, you need to delete the cache and cookies of the web browser.

Therefore, take a look at the procedures on how to remove them on your own.

Step 1

First of all, launch the web browser on your device and move to the Settings option. After that, scroll down and select the Advanced option.

Step 2

Now, you will find an option called Clear Browsing data and select it. In this section, you will notice three options, mark all the three options.

Step 3

Next, click on the Clear Data to move forward. When the process gets completed, re-launch the web browser again and check whether the error code still persists or not.

Fix 2: Update the Web Browser

An outdated version of the web browser can also be responsible for the Gmail 400 error. Therefore, to get rid of this situation, you should install the updated version of the web browser.

To get the updated version, go through the steps mentioned in the section below.

Step 1

At first, open the web browser and then move to the More option. Now, a drop-down menu will appear on the system screen. Select the About option of the list.

Step 2

In this section, you can check the current version of the web browser. If an update is pending, download the latest version. After that, install it on your device and restart the system

Once the process gets completed, relaunch the updated web browser. Hope this method will surely work for you.

Fix 3: Check for the Internet Issues

According to the users, the problem might appear due to the poor internet connection. After examining several additional websites, if you found that the websites are not opening, then it is confirmed that the problem has occurred due to the poor internet connection.

Therefore, you need to check the internet connection whether it is the WiFi connection or the cellular connection. If possible, then change the WiFi connection and try to connect the internet. Now, check whether the Gmail account is working properly or not.

Alternative Ways to fix Error 400 for Gmail

If none of the above solutions help you to solve the error code then try out this one.

  • The first and foremost thing you have to do is to launch Chrome from your device.
  • Once Chrome opens just right-click on your mouse and you will see few options on the screen.
  • From here, you need to choose “inspect element” icon and proceed with the next step.
  • Now, select the Resources icon that is located at the top of the display.
  • After that, look at the left side of the display and navigate to the Cookies option and tap on it to expand it.
  • Next, tap on the “mail.google.com” icon and select “Gmail_imp” by clicking on it.
  • Then, select Delete from the list and remove all the files from here.
  • Once all the files get deleted restart Gmail and if needed then log in again. Remember to provide the correct credentials oi n the respective fields.


Hope that the above-discussed methods will beneficial for you to eliminate the Gmail error 400 effectively. These solutions are quite simple and easy-to-perform.

If you are still getting this error code, you should inform us by commenting in the comment section provided below. We will get back to you with advanced solutions and suggestions.

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