The Photo option at the top of your Tumblr dashboard has the settings to upload and post a screenshot to your Tumblr blog. Use the native Snipping Tool in Windows 8.1 to take a screenshot of your entire screen, a section of the screen or a specific window. Save the screenshot in the PNG, JPG/JPEG or GIF format, which are the image file types that Tumblr supports.
Open the Modern UI by pressing the Windows key and then type Snipping Tool. Choose Snipping Tool to launch the Snipping Tool.
Click the arrow adjacent to the New button and select the type of screenshot -- there are four available options -- you want to take. For example, select the Rectangular Snip option to use your cursor to select the area you want to capture.
Select Full-screen Snip to take a screenshot of your whole screen, choose Window Snip to capture a specific window or select Free-form Snip to manually draw around the area that you want to capture.
Press and hold your mouse's left button, drag the cursor over the area you want to capture and then release the button to open the screenshot in the Snipping Tool window.
Open the File menu, choose Save As from the menu and then navigate to the location where you want to save the screenshot.
Sign in to your Tumblr account dashboard and click the Photo icon at the top of the page to open the Photo dialog box.
Click the Upload Photos icon and then navigate to the screenshot you previously saved.
Select the screenshot and click Open to upload the file to your Tumblr account.
Type a caption in the Add a Caption area describing the screenshot. Click the arrow next to the Post button and then select Post Now from the pop-up menu. Click the Post button to post the screenshot.
Tips & Warnings
- The Snipping Tool is available in Windows 7 through the Start menu. Click the "Start" button, select "All Programs" and then click the "Accessories" folder. Select "Snipping Tool" to open the program.
- Use the Screen Capture feature in Windows as an alternative way to take a screenshot. Press "Windows-PrtScn" to take a screenshot of your entire screen and automatically save it to the Pictures folder. If you want to capture only a single window, select the window and then press "Alt-PrtScn." Paste the screenshot into an applicable program, such as Paint.
- To prevent Tumblr from scaling down your screenshot, upload an image that is 500 pixels by 750 pixels or less.