Start with the task, not the extension
A photograph contains subtle gradients and many colors. A logo may have sharp edges and a transparent background. A screenshot often contains small text. These differences matter more than the file extension. Export a version, view it at its intended display size and check the result.
| Format | Try it for | Watch out for |
|---|---|---|
| JPG | Photos and compatible attachments | No transparency; lossy compression |
| PNG | Graphics, screenshots and transparency | Photographs can be large |
| WebP | Images on websites | Check the recipient accepts it |
JPG: a practical choice for photos
JPG uses lossy compression, discarding some information to save space. A moderate quality setting can look good, but the result depends on the subject. Inspect edges, hair and lettering: halos and block patterns can reveal excessive compression. PixelSvelto replaces transparent areas with your chosen background color when exporting JPG.
PNG: preserve edges and transparency
PNG is often useful for screenshots, icons and graphics with few colors. Its compression is lossless, but converting an old JPG to PNG cannot recover detail already discarded by the JPG. Conversion does not recreate the original. The quality slider does not affect PNG output in this tool.
WebP: an option for the web
WebP supports transparency and both lossy and lossless compression modes. PixelSvelto uses the browser’s encoder, so results also depend on your device, and a dedicated lossless mode is not selectable here. For a website, compare WebP with JPG; for a portal that only accepts JPG, follow the portal’s requirement.
Try your own image
Open the converter, export a WebP version and a JPG version, then compare them. If pixel dimensions matter, try the resize tool too. Your browser processes the files; the application does not upload them.