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How to Make Thumbnails

A thumbnail is a reduced-size image of a photo or video image. They are used on websites to link to images and videos. This wikiHow teaches you how to create thumbnail images using different photo editing programs. Open MS Paint. MS Paint...
Method 1 of 3:

Using MS Paint on Windows

  1. How to Make Thumbnails Picture 1How to Make Thumbnails Picture 1
    Open MS Paint. MS Paint has an icon that resembles a painters pallet. Use the following steps to open MS Paint for Windows.
    1. Click the Windows Start menu in the lower-left corner.
    2. Type "Paint".
    3. Click the MS Paint icon.
  2. How to Make Thumbnails Picture 2How to Make Thumbnails Picture 2
    Open an image you want to make a thumbnail for. Use the following steps to open an image in MS Paint.
    1. Click File in the upper-left corner.
    2. Click Open.
    3. Select an image.
    4. Click Open.
  3. How to Make Thumbnails Picture 3How to Make Thumbnails Picture 3
    Create a copy of the image. You don't want to edit the size of the original image. Save the image as a separate copy. Add "thumbnail" or something similar to the end of the copy of the image (i.e. weddingphoto_thumbnail.jpg). Use the following steps to create a copy of the image:
    1. Click File
    2. Click Save As.
    3. Type a name for the image next to "Filename".
    4. Click Save.
  4. How to Make Thumbnails Picture 4How to Make Thumbnails Picture 4
    Click Resize. It's in the upper-left corner above the box labeled "Image".
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    Tick "Percentage". It's at the top of the "Resize and Skew" window.
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    Type the percentage you want to reduce the image size next to "Horizontal" or "Vertical". 10% is a good size for a thumbnail image. Larger photos will need to be reduced greater.
    1. Alternatively, you can select "Pixels" and type the exact dimensions in Pixels you want the image to be next to "Vertical" and "Horizontal".
  7. How to Make Thumbnails Picture 7How to Make Thumbnails Picture 7
    Click Ok. This reduces the size of the photo.
  8. How to Make Thumbnails Picture 8How to Make Thumbnails Picture 8
    Save the photo. Use the following steps to reduce the size of the photo.
    1. Click File
    2. Click Save.
Method 2 of 3:

Using Preview on Mac

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    Open an image in Preview. Preview is the default image viewer on Mac. You can double-click an image on your Mac to open it in Preview.
  2. How to Make Thumbnails Picture 10How to Make Thumbnails Picture 10
    Duplicate the image. You don't want to edit the size of the original image. Use the following steps to duplicate the image in Preview.
    1. Click File in the upper-right corner in the Menu bar.
    2. Click Duplicate.
  3. How to Make Thumbnails Picture 11How to Make Thumbnails Picture 11
    Click Tools. It's in the menu bar at the top of the screen. Make sure you have the image copy as your active image.
  4. How to Make Thumbnails Picture 12How to Make Thumbnails Picture 12
    Click Adjust Size. It's in the menu below "Tools".
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    Select "Percentage". Use the drop-down menu next to "Width" and "Height" to select "Percentage".
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    Type the percent you want to reduce the image size. Type this next to "Width" or "Height". 10% is a good image size for a large-sized thumbnail image. The amount you want to reduce it may vary depending on the size of the image.
    1. Alternatively, you can select "Pixels" and type the exact dimensions in Pixels you want the image to be next to "Width" and "Height".
  7. How to Make Thumbnails Picture 15How to Make Thumbnails Picture 15
    Click Ok. This reduces the size of the image.
  8. How to Make Thumbnails Picture 16How to Make Thumbnails Picture 16
    Save the image. It's a good idea to add "thumbnail" or something similar to the end of the copy of the image (i.e. weddingphoto_thumbnail.jpg) when saving the image copy. Use the following steps to save the image.
    1. Click File.
    2. Click Save
    3. Type a name for the image next to "Save As."
    4. Click Save.
Method 3 of 3:

Using Photoshop and GIMP

  1. How to Make Thumbnails Picture 17How to Make Thumbnails Picture 17
    Open Photoshop or GIMP. Photoshop is the most popular image editor. It requires a subscription from Adobe. If you do not have a subscription to Photoshop, you can download and install GIMP for free. It has similar features to Photoshop.
  2. How to Make Thumbnails Picture 18How to Make Thumbnails Picture 18
    Open an image you want to reduce the size of. Use the following steps to open and image in Photoshop or GIMP:
    1. Click File in the upper-left corner.
    2. Click Open.
    3. Select an image.
    4. Click Open.
  3. How to Make Thumbnails Picture 19How to Make Thumbnails Picture 19
    Save a copy of the image. If you want to edit the photo, do so before making a copy of the photo. You'll also want to add "thumbnail" or something similar to the end of the filename. When you are ready, use the following steps to save a copy of the photo:
    1. Click File
    2. Click "Save As'.
    3. Type a name for the image next to "Filename".
    4. Click Save.
  4. How to Make Thumbnails Picture 20How to Make Thumbnails Picture 20
    Crop the image (optional). If you want to make the image fit a certain shape, you can crop the image. The crop tool has an icon that resembles two right angles forming a square. Using the following steps to crop the image:
    1. Click the crop tool in the toolbar to the left.
    2. Click and drag over the section of the image you want to keep.
    3. Double-click inside the image.
  5. How to Make Thumbnails Picture 21How to Make Thumbnails Picture 21
    Click Image. It's in the menu bar at the top of the screen.
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    Click Image size or Scale Image. This is the option to resize the image.
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    Select "Percent". It's in the drop-down menu next to "Height" and "Width".
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    Type the percent you want to reduce the image size. Type this next to "Width" or "Height". 10% is a good image size for a large-sized thumbnail image. The amount you want to reduce it may vary depending on the size of the image.
    1. Alternatively, you can select "Pixels" and type the exact dimensions in Pixels you want the image to be next to "Width" and "Height".
  9. How to Make Thumbnails Picture 25How to Make Thumbnails Picture 25
    Click Ok or Scale. This scales the image size down.
    1. You may want to apply saturation to the thumbnail image You can do so by adding a saturation adjustment layer in the Adjustment panel to the right in Photoshop, or by clicking the "Colors" drop-down menu at the top in GIMP.
    2. You may also want to apply a sharp filter. You can do so by clicking the Filters menu at the top of both Photoshop and GIMP.
  10. How to Make Thumbnails Picture 26How to Make Thumbnails Picture 26
    Save the image. Use the following steps to save the thumbnail image in both Photoshop and GIMP.
    1. Click File.
    2. Click Save as (Photoshop) or Export as (GIMP).
    3. Select JPEG as the image using the drop-down menu next to "Format" in Photoshop, or below "Select File Type" in GIMP.
    4. Click Save (Photoshop) or Export (GIMP).
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