How to Convert Pictures To JPEG
Many websites and apps won’t allow you to upload a photo unless it ends in .JPG (also known as a JPEG). If your photos end in .GIF, .TIFF, .PNG or any other file extension, this can be super frustrating. While converting some images to JPEG will result in a less crisp picture, the format is known for its ability to retain the best possible quality in the smallest possible file size. While you don't have to be a computer whiz to convert an image to JPEG, you will need to learn a few tricks of the trade.
Part 1Using Paint in Windows
Paint comes pre-installed on your PC. Press ⊞ Win+S to open the search box and type paint. When you see “Paint” appear in the search results, click on it.
Make sure the image is on your computer. Click the “File” menu and select “Open.” Locate your image and click “OK.”
” A list of image types, including JPEG, will appear.
” This will launch a new box which allows you to choose a folder, rename the file, and select a “Save as type.” Navigate to a folder you’ll recall later and make sure “JPEG” is selected as the “Save as type.”
” Your file has been converted.
Part 2Using a Web Converter On a Computer, Smartphone or Tablet
This method works for any device connected to the web, including smartphones and tablets. Do a web search for “convert XXX to jpg online” (where “XXX” is the type of file you’re converting from) to browse through options. Sites like Online-Convert contain lists of all of the file types it can convert to and from.
Make sure any site you choose is capable of handling your image type. Some image types, such as .RAW files, are harder to convert online due to their size. If you’re using a mobile device, use Wi-Fi instead of your data plan. Image files can be huge.
In your converter, find the button that says something similar to “Choose file” and locate the file you wish to convert. Note that many converters have maximum file sizes.
Read through the terms or usage policy before uploading. Some converters allow you to enter a URL, which is great if your image is online.
Most converters will have a dropdown menu or button to press where you can select “JPEG” or “.JPG” (these two options will do the same thing). Some converters also allow you to modify the size and quality of the file on this screen.
Find the button that says “Convert” or “Save” to start the conversion. This could take several minutes. The image will either download automatically to your default download location or you’ll be prompted to choose one. Once the process is complete, your image will be converted to a JPEG.
Part 3Using Preview on a Mac
 Preview comes pre-installed on your Mac and will open almost any type of image.Ctrl + click the image and select “Open With.” Choose “Preview.”
If you run into an image type that you can’t open or that looks wrong in the software, try using or . The image has to be on your computer for this method to work. If you’ve not yet downloaded the image to your computer, you’ll need to do that first.
” A box containing several menus will appear.
You can also adjust the quality and resolution if you wish. The higher the quality or resolution, the more space the photo will take up on your hard drive.
Make sure the name of your file ends with “.jpg” (case does not matter) then select a saving location that you’ll remember. Click “Save” to complete the conversion.
Part 4Using Gimp on PC, Mac or Linux
 If you’re trying to convert an image type that isn’t supported in your current software, or if you just want an option that’s more robust, Gimp is massively popular and free. If you don’t already have Gimp installed, download and install it.
 Click “File,” then “Open.” Select the image and click “Open” once more.
 A dialog box will appear with several options to choose from. Click “JPEG.”
A new dialog box will appear with options for your JPEG. Put a check in the box next to “Show preview in image window” before adjusting the image quality. Move the slider to the place where your image looks best in the preview.
” A box will appear that asks you to choose a new file name and location. Find a folder you’ll remember and give the file a new name if you’d like. The file already has .jpg appended to the end, so leave that part intact (the extension is not case-sensitive). Click “Save” to complete the conversion.
Part 5Changing the File Extension
If you have a JPEG file with the wrong file extension, such as if a typo has your file ending with “.JGP” instead of “.JPG,” this method will be useful. This method will not technically “convert” an image to a JPEG.
If your image file is not already a JPEG file, changing the file extension could break your file. See other methods if you’re hoping to turn a different image file into a JPEG file. File extensions are not case-sensitive. .JPG and .jpg are the same thing. Before you get started, make a note of the original file extension so that you can change it back if necessary.
It could be on your desktop, as in the example, or in a separate folder you can access through Finder or Windows Explorer.
If you’re using Windows, you can skip this step. Mac users should click once on the image, click “File,” then “Get Info.” Click the arrow next to “Name and Extension” and remove the check from “Hide Extension.” Click “Save.”
Erase everything after the “.” in the file name.
On a Mac, click the image once and press ⏎ Return. Click at the end of the file extension and press Delete until you’ve erased everything after the period. In Windows, right-click the image and select “Rename.” Click at the end of the file extension and press ← Backspace to delete everything after the period.
Upper or lowercase is fine. Your filename should look something like this: image.jpg. Press ↵ Enter or ⏎ Return.
Whether you’re using a Mac or a PC, you’ll see a warning about how changing the file extension could make your file unusable. Click “Use.jpg” or “Yes” if you want to make the change. Your file name will now end in .JPG.