How to Convert an Image to Another Format

Before you begin

Image Converter changes supplied image data into PNG, JPEG, WEBP, GIF, BMP, or TIFF output. This is useful when an image needs to match the format expected by a website, application, editing workflow, or archive. The input is optional at the operation level, but a conversion cannot proceed without image data.

The target begins as PNG when you do not choose another format. Format names are handled without regard to capitalization, and JPG is treated as an alias for JPEG. You can also provide a quality value, although its role depends on the selected output format.

Conversion procedure

Prepare the source. Have the source image represented as image data before starting. When image data is supplied, it is interpreted as base64-encoded image bytes, so the value should contain the encoded image rather than an unrelated text description or an empty field.
Supply the image data. Enter or pass the encoded value through the image input. Check that the value is present before submitting the operation, because the conversion returns a failure when no image data is supplied.
Choose the output format. Select PNG, JPEG, WEBP, GIF, BMP, or TIFF as the target. If you leave the target unchanged, PNG is used. If your workflow names the destination JPG, it is handled as JPEG rather than as a separate output type.
Review the quality option. For JPEG or WEBP output, provide a quality value when you want to replace the default value of 90. The quality value is passed to the encoder for those two formats. It is not passed for PNG, GIF, BMP, or TIFF, so changing that option does not control encoding for those destinations.
Submit the conversion. Send the supplied image data together with the chosen target and, when relevant, the quality value. Wait for the operation to finish before using the returned data, then inspect the output details to confirm that the selected destination matches your intended workflow.
Use the converted data. A successful operation provides encoded data for the converted image as well as information about the selected output format and the output byte size. Keep those details with the result when you need to distinguish between several converted images or compare the size of different outputs.

For a format change from JPEG to WEBP, for example, supply the JPEG image data, choose WEBP, and decide whether the default quality value suits the task. For a PNG destination, omit quality considerations because that value is not passed to the PNG encoder. Selecting the destination before submitting helps prevent an unintended conversion to the default PNG format.

Understanding the returned result

Read the reported output format together with the encoded image data and byte size. This is especially useful when the destination was left at its default or when JPG was entered and the returned format should be understood as JPEG.

A failure does not identify one single cause. It can result from missing image data, a target outside the supported set, or a problem while decoding, opening, converting, or saving the image. Check the input first, then verify the destination name and the source data before submitting the operation again.

Quality should be interpreted as an encoder input for JPEG and WEBP, not as a universal control over every conversion. The supported destination set is PNG, JPEG, WEBP, GIF, BMP, and TIFF; a request outside that set is unsuccessful. Image data that cannot be processed also produces an unsuccessful operation, so a selected format alone does not establish that conversion will finish.

Worked example

You need a WEBP version of supplied JPEG image data for a web project.

Supply the JPEG image data, select WEBP, leave quality at its default value, and submit the operation.

The successful result contains converted-image data, identifies WEBP as the selected output format, and reports the output byte size.

Limitations

Quality is passed only for JPEG and WEBP encoding; destinations outside the supported set are unsuccessful, and image processing may fail during decoding, opening, conversion, or saving.

Common errors

Cause: The image input contains no supplied data. Fix: Add the base64-encoded image bytes, verify that the input is present, and submit the conversion again.

FAQ

What format does Image Converter use by default?

When no other destination is selected, the operation uses PNG. JPG is accepted as another name for JPEG.

How does the quality setting work?

For JPEG and WEBP, the supplied quality value reaches the encoder, and its default is 90. PNG, GIF, BMP, and TIFF conversion does not receive that value.

Why did the image conversion fail?

If the operation is unsuccessful, inspect whether image data was supplied, whether the destination belongs to the supported set, and whether the image could be decoded, opened, converted, or saved.