In this tutorial, we will teach you how to create an animated GIF in Gimp. For this tutorial, we will be simply animating text, making each word in a sentence appear one frame at a time.
For this tutorial, we will be working on a document size of 450 by 150 pixels. That's 450 for the width and 150 for the height. Make a blank new document of this dimension in Gimp and let's get started.

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Step 1 -- Adding the first word
Before we get started, you should know that when making an animation, Gimp would think of every layer in the document as an animation frame. So for every frame, there should be corresponding layer in the document. Therefore, we will type each and every word of the sentence in the different layer for this tutorial.
So let's move to the toolbox and pick up the text tool. After that, move back to the canvas and create the text box by simply clicking on the canvas. With that done, enter only the first word of the sentence. For this tutorial, we have used green color for the font and have kept the font size to 30, using Sans for the font type. With that done, you can pick up the move tool and change the position of the text box accordingly.

Step 2 -- Adding the rest of the text
In a similar way, you can add the rest of the text in different layers. For this tutorial we have written "Life Is Beautiful" in different layers, using the same font type, font size for the entire sentence. The only difference made here is that the word Beautiful is in red color, while the rest of the text is in green.
Since you would be working on separate text layers, do remember to align them at the end, according to your artwork.

Step 3 -- Playing the animation
Once you are done with the text, open up the file menu, move over to animation and select the playback option. With that done, a new window will open up where you can preview the animation. All you have to do is click on the play button and the animation would start. In the preview, the animation will play too fast but don't worry; you can set the duration later while saving the document.
From this window you can also determine the frames per second by opening the drop down menu highlighted in the image below. For this tutorial, we have kept the default values as it is.

Step 4 -- Exporting the document
Now let's convert the artwork and create an animated gif in Gimp. For that, open up the File menu and click on the export as option. Once the new window opens up you can choose a location where the file should be saved and name the file. With that done, click on the export button to save the document.

Step 5 -- Configuring the animation options
Once you click on the export button a new window will open up. Here, make sure that the "As animation" option is ticked. You can even enable the loop forever option which would keep playing the animation again and again.
Over here you have the "delay between frames" option. What this will do is set all of the frames in the animation to a particular timeframe according to the value put here. 1000 milliseconds equals 1 second, so we have changed the value to 354 for this option. After that, click on the export button and with that done, you would have created an animated gif in Gimp.