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If you don't have the Google Chrome browser installed on your computer, install it before proceeding. If you're using a Mac that doesn't have Chrome installed, you can use the Safari method instead. Open Google Chrome if it isn't already open, then click ⋮ in the top-right corner of the window and click New incognito window near the top of the resulting drop-down menu.  This step may seem unnecessary, but it ensures that you won't have to log out of (and then log back into) your Instagram account. You can also press Ctrl+⇧ Shift+N (Windows) or ⌘ Command+⇧ Shift+N (Mac) to open a new incognito window. It's in the upper-right corner of the window. A drop-down menu will appear. This is near the bottom of the drop-down menu. Selecting it prompts a pop-out menu to appear next to the drop-down menu. It's at the bottom of the pop-out menu. This will prompt the Developer window to pop out from the right side of the Chrome browser. This rectangular icon is in the upper-left corner of the Developer window. The icon will turn blue, and your browser will refresh into a mobile format. If this icon is already blue, mobile view is enabled. Click the address bar at the top of the Chrome window—making sure to delete any text there if necessary—then type in instagram.com and press ↵ Enter. Instagram's login page will open. Click Log in near the bottom of the page, then enter your login credentials and password and click Log in. You should see your Instagram feed open in mobile format. It's at the bottom of the page. This will open a File Explorer (Windows) or Finder (Mac) window on your computer. Click a photo that you want to upload to Instagram. You may first have to click the folder in which the photo is located on the left side of the window. It's in the bottom-right corner of the window. This will upload the photo to the Instagram mobile site. Scroll down to click the Filter tab in the lower-left side of the page, then scroll down again and click a filter that you want to use. This step is optional, so skip it if you don't want to use a filter. It's a blue button in the upper-right side of the "New Post" page. Click the "Write a caption..." text field, then type in a description for your photo. It's a blue button in the upper-right side of the page. The photo will be posted to your Instagram page.
Make sure that you have Google Chrome installed. Open an incognito window in Google Chrome. Click ⋮. Select More tools. Click Developer tools. Click the "mobile" icon. Open the Instagram website. Log into Instagram. Click ＋. Select a photo. Click Open. Select a filter. Click Next. Enter a description. Click Share.