Clean Up Your iPhone Inbox by Marking All Messages as Read

• If you're using the Mail app, you can tap Edit at the top-right corner of your inbox, choose Select All, tap Mark, and then choose Mark as read.
• If you use the Gmail app, you can't mark all messages as read in the mobile app, but you can get the job done in your web browser's Desktop Mode.
• Both the Outlook and Yahoo Mail apps both have easy ways to select all messages at once and mark them as read.

Using the Mail App

Open the Mail app on your iPhone. It has a blue icon with a white envelope in the middle.

Tap iCloud (or your mail service's name, if different). You'll see this at the top-left corner of the screen. This will take you to the Mailboxes screen, where you'll see a list of all email accounts you've set up in the Mail app.

Tap All Inboxes. It's the first option in the menu. This allows you to select all emails from all inboxes. If you don't see this option, tap Edit at the top-right corner of the Mailboxes screen, select All Inboxes, and then save your changes. You will see it then. Alternatively, if you would rather select a specific inbox, tap the inbox you want to select in the menu to the left.

Tap Edit. It's in the upper-right corner. This displays a radio button next to your emails so you can select them.

Tap Select All. It's in the upper-left corner. This selects all emails in the selected inbox(es). Alternatively, if you only want to mark some emails as read, tap the radio button next to the messages you want to select.

Tap Mark. It's in the lower-left corner. This displays a pop-up menu.

Select Mark as read. It's the second option in the pop-up menu. This marks all selected emails as read.

Using Gmail

Go to https://mail.google.com in a web browser. You can use any web browser installed on your iPhone or iPad, including Safari, to access Gmail. You'll need to use a web browser to mark all messages as read, as the Gmail mobile app doesn't have this feature. You may be asked to open the Gmail app. If asked, tap Use Web Version at the bottom of the page.

Log in to Gmail if needed. If you are not logged into your Gmail account in a web browser, log in using the email address and password associated with your Gmail account.

Request the desktop version of the website. You need to request the desktop version of the Gmail website to select all emails. To do so: Tap the Share icon, which resembles a box with an arrow pointing up. It's in the upper-right corner. Tap Request Desktop Website or similar, depending on which web browser you are using.

Select an inbox. If you don't see the menu bar to the left, tap the menu icon, which resembles three horizontal lines (☰). It's in the upper-right corner. Then, tap Inbox. From here you can select your primary inbox, Promotions, or your Social inbox by tapping one of the tabs at the top of the page.

Tap the checkbox Android 7 Checkbox at the top of the page. You should see a checkbox to the left of each email. This allows you to select individual emails. Tap the checkbox directly above the first checkbox in the list to select all emails. It's to the left of all the button options at the top of the page in the upper-left corner.

Tap ⋮. It's the button with three dots to the right of all the button options above the list of emails. This displays a drop-down menu.

Tap Mark as read. It's the first option in the drop-down menu. This marks all selected emails as read.

Using the Outlook App

Open the Outlook app. The Outlook app has an icon that resembles a blue envelope with a blue sheet of paper coming out of it. If you do not have the Outlook app installed on your iPhone, you can download it for free from the App Store. If you are not signed in automatically, sign in using the email address and password associated with your Outlook account. Alternatively, you can set up your Outlook account to work with the Apple Mail app.

Select an inbox. To do so, tap the icon that resembles three horizontal lines (☰) in the upper-left corner. Then tap the inbox you want to use.

Select an email. To do so, tap and hold an email in your list. This will select the email and display a radio button next to each email. You can use the radio buttons to select multiple emails.

Tap Select All. It's in the upper-left corner above your list of emails. This selects all your emails.

Tap the icon that resembles an open envelope. It's the second option at the bottom of the screen. This marks all emails in your list as read.

Using Yahoo! Mail

Open the Yahoo! Mail app. It has a purple icon with a white envelope on the front. Tap the Yahoo! Mail app on your Home screen to open the Yahoo! Mail app. If you do not have the Yahoo! Mail app installed on your iPhone, you can download it for free from the App Store. If you are not already signed into the Yahoo! Mail app, sign in using the email address and password associated with your Yahoo! account.

Tap and hold an email. This selects the email and displays a radio button next to all the rest of your emails. You can use the radio button to select multiple emails.

Tap the checkmark icon in the upper-left corner. It's above the radio options in the list of emails. This selects all emails.

Tap Mark as read. It's the fourth option at the bottom of the screen. It's below an icon that resembles a circle. This marks all your emails as read.