The problem of inappropriate picture extensions is solved simply and efficiently

Due to the lack of necessary knowledge of image formats, many users encounter some incorrect image formats when completing some basic operations, such as opening images, uploading avatars and other tasks. Some people think that since there are hints, it is better to modify the image extensions according to the hints, but after modifying them in this way, they often still do not work. So, how can we quickly get the image files that meet their “format” requirements? Here are a few quick and easy solutions.

1. Use the system’s own functions to convert a single image

First of all, we can make use of the “Paint” or “Photo” software that comes with the system, which is compatible with most common picture formats. Open an existing picture and execute the “Save As” command, select the desired extension (type) of the target picture and save it, basically you can meet the requirements and use it directly (Figure 1).



Many people generally have different picture viewing software installed in their Windows system, and most of these software also contain a picture format conversion function, usually using the “Save As” option located in the menu or right-click menu.

2. Batch image conversion using third-party software

If you want to convert the extensions of batches of images, it would be inefficient to use a viewer tool, so you can use a dedicated third-party tool to do so. For example, you can use the free image batching tool ImagesMixer (download at:

After launching the software, click the large plus button on the left to add the image to be converted, then check the “Convert” option and select the target extension to be converted to in the list that follows. Finally, click the “Start processing” button at the bottom of the left side to convert (Figure 2).


If a newer version of the classic image grabber Snagit (e.g., version 2018, 2019 or 2020) is installed on your computer, there is a powerful “Batch Convert Image” function integrated into the right-click menu of the image file, and you can select the file extension in the third step of the conversion wizard (Figure 3). You can use it to batch convert the extensions of image files.


3. Conversion using web-based online services

If you just want to convert some images temporarily and don’t want to install any software, you can also choose online conversion services on the web, such as using “I pull” ( Click the Upload button to upload a file (or drag the file to be converted directly to the dotted box), then select the target file extension type and convert it online (Figure 4). This web service is limited to 50MB of single files that can be converted for free at a time, and can convert 4 files at the same time each time.



The image format is the internal encoding of the image, while the extension is just an external representation of the image format. The change of image format is often indicated by the extension, but it doesn’t mean that the image format must be changed when the extension is changed, and the manual method of changing the extension we mentioned at the beginning of the article actually doesn’t change the image file format. We use the above-mentioned software or network to convert the extension of the image file, the essence is the conversion of the file format.

Extended reading.

On the basis of sufficient knowledge of image formats and file extensions, it is only a more feasible way to modify the file extensions directly. For example, if you understand that the specifications of JPG, JPEG, JFIF and other images are similar or the same, and only the extensions are different, then when you encounter a situation where only the JPG image is recognized, you can directly replace the suffix name of the JPEG, JFIF file.

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