JPEG, PNG or WebP: choose a format for the image you have

Choose by image content and destination support

The best format depends on what the image contains and where it will be used. Start with the destination’s accepted formats. A smaller WebP file is not useful for an upload form that only accepts JPEG. A JPEG is not suitable when the destination needs a transparent logo.

For a photograph with no transparency, compare JPEG and WebP exports. For a screenshot with small text or a flat-color diagram, begin with PNG and check whether an alternative preserves the edges. Do not use the extension alone to judge quality: a poor original remains poor after conversion.

JPEG is a useful option for photographs

JPEG, commonly named .jpg, uses lossy compression. An encoder trades some image information for fewer bytes. It works well for many photographs because a small change in complex texture may be less noticeable than a change around the sharp edges of a screenshot.

JPEG does not retain an alpha channel for transparency. A transparent input exported as JPEG needs an opaque background; inspect that background and the edges around the subject before using the result. JPEG also does not preserve an animation as multiple frames.

Keep an original or a lossless working copy for editing. Export the JPEG when you are ready to share. Saving a JPEG repeatedly during editing can accumulate artifacts, and changing the filename from .jpg to .png does not change the file’s encoding.

PNG preserves pixels and supports transparency

PNG uses lossless compression and can store transparent pixels. It is a useful starting point for interface screenshots, flat-color illustrations and graphics whose sharp edges matter. Lossless describes the compression of the pixels in that PNG; it does not mean a conversion restores a damaged input.

A detailed photograph can produce a large PNG because there is less repetitive image data to compress. If the destination does not require transparency or a lossless format, compare an acceptable JPEG or WebP result rather than uploading a large PNG simply because it sounds higher quality.

Resizing, cropping and enhancement change image pixels even if the final format is PNG. Choose the operation and the format separately. If exact original pixels are essential, preserve the original and avoid transformations that alter them.

WebP combines several useful web-image features

WebP supports lossy and lossless compression, transparency and animation. It can be a useful choice for web images when the destination supports it. Compare the actual outputs for your file rather than expecting a fixed percentage saving for every image.

Transparency support and lossless compression are separate properties. A WebP can keep a transparent background while its color information is compressed lossily. Check the edges of a cutout on a contrasting background, especially around hair, shadows and thin lines.

Compatibility depends on the receiving application as well as your browser. If an application rejects WebP, use PixaTok’s Image Converter to create an accepted format. Select JPEG only when you can accept an opaque result; choose PNG if transparency must remain.

Check a converted file before replacing the original

Upload one supported image, select the output format, process it and open the downloaded result. PixaTok lists JPG as JPEG in its format menu. Quality controls do not have identical effects for every format, so inspect the image and its file size rather than treating the number as a universal score.

For animations, verify more than the first preview frame. Check the output’s frames, timing and behavior in the destination application. PixaTok rejects JPEG and BMP output for multi-frame images. Keep the original image and read the privacy policy for file and data details.