PNG, JPEG or WebP: choose the format for the image
Compare formats for photos, screenshots and transparency, then check the exported result and the upload service’s accepted formats.
In brief
For a photograph, JPEG or WebP is usually worth comparing for file size and visible quality. For a screenshot with small text, try PNG first. If the image needs transparency, avoid JPEG and check PNG or a supported WebP export.
Changing the extension cannot create transparency or improve a damaged image. Select a format by what must survive in the picture and where the file will be used.
This guide uses the linked product documentation. Worked scenarios explain how to check your own result; they are not measurements of your device.
Pick according to the content
A photograph has continuous colour variation; a screenshot often has sharp text and edges. A format that gives a small photo can introduce distracting artefacts around screenshot text. Judge the content, not whether an extension sounds newer.
For a logo or cut-out that needs a transparent background, verify that transparency remains after export. JPEG does not offer it; a white background is a changed result, not an invisible equivalent.
| Content | Try first | Inspect |
|---|---|---|
| Photograph | JPEG or WebP | Fine detail and compression artefacts |
| Small text or interface screenshot | PNG | Letter edges and legibility |
| Transparent graphic | PNG or supported WebP | Background and edge transparency |
| Upload to a restricted service | An accepted format | File-size and dimension limits |
Compare actual exports
Export the same original rather than repeatedly converting an already compressed copy. View the results at the size the reader will see, then zoom in for small text. Note the file sizes; do not assume every WebP export is smaller under every setting.
If the limit is about width or height, resizing is a separate step from choosing a format. A different extension alone cannot satisfy a dimension requirement.
Keep compatibility and the original
Open the export and test it at the intended destination. Some older workflows or upload forms accept JPEG and PNG but not every newer format. A small file is not useful if the recipient cannot open it.
Use the local image converter for supported browser exports when appropriate. Its result depends on the browser’s encoding support; retain the original if another application needs a format the tool does not offer.
A transparent logo and a photo need different checks
For a transparent logo, convert a copy to PNG or supported WebP and place it over both a light and a dark background. A white rectangle means transparency was flattened somewhere. LA24X’s converter deliberately uses a white background when exporting JPEG because JPEG cannot retain an alpha channel. Re-export from the transparent original to PNG or WebP; converting the white JPEG back will not reconstruct the lost background.
For a photograph, compare JPEG and WebP at the same dimensions. Keep the smaller version only if the subject and fine details remain usable. There is no fixed saving that applies to every picture, and a JPEG quality value is not a percentage of the original file size.
The converter reports the format actually produced and rejects an unsupported export. A recipient may still require JPEG or PNG. Check its accepted types before choosing the smallest file.
Documentation for these steps: MDN — Image formats ↗
Tools for this task
Before you act
A service can reject a valid format it does not accept. Lossy conversion can damage small text or fine edges; keep the original and inspect the export at normal viewing size.
What to do next
- Identify whether the image is a photo, a text-heavy screenshot or a transparent graphic.
- Check which formats the destination accepts.
- Export a copy in the appropriate format and compare visible detail and file size.
- Open the exported file before uploading; keep the original for another conversion.
