JPG, PNG, or WebP: which format should you choose?

Choose for the image and the place it will be used

For a photograph, compare JPEG and WebP if the receiver accepts both. For a logo with transparent edges or a screenshot containing small text, start with PNG and check alternatives carefully. An upload form’s accepted formats override a general preference for a smaller file.

Image and purpose	Useful starting format	What to inspect
Photo for an application or attachment	JPEG	Acceptance, faces, texture, file size
Transparent logo or icon	PNG	Alpha transparency and edge appearance
Screenshot with fine text or diagrams	PNG	Character shapes, thin lines, flat colors
Photo or graphic for a website	WebP and the current format	Actual bytes, appearance, publishing support
Page or artwork that must retain vector detail	Original PDF or vector file, if accepted	Whether raster conversion is needed at all

MDN’s format guide describes the core distinction: ordinary JPEG uses lossy compression and does not carry alpha transparency, while PNG supports lossless image compression and transparency. That makes them different starting points, rather than a universal quality ranking.

A lossless container cannot repair a damaged source

Saving a blurry JPEG as PNG preserves a representation of the already blurry image. It does not recreate the earlier source. Similarly, turning a small screenshot into a larger file does not add the original text detail that a previous resize removed.

Keep the source file and create candidate exports from it. For a photograph, check a face and an area of fine texture. For a screenshot, check small labels and high-contrast borders. These are proposed comparison steps, not results of a measured compression experiment.

If the source is a PDF and you need selectable text, links, or a scalable page for printing, preserve the PDF when the destination allows it. Use the PDF image guide when a fixed image is actually required.

Separate WebP capabilities from export settings

Google’s WebP documentation describes lossy and lossless compression, transparency, and animation support. A tool exposing a WebP output option does not necessarily expose every one of those modes.

Tooliv provides a quality control for its lossy-format exports. A setting of 100 does not establish that a lossless WebP mode was used. The Canvas export API’s quality parameter applies to lossy encoding, as MDN explains.

Check WebP acceptance in the service that receives the file, including its upload form and later editing or export steps. Browser support alone does not establish that an older publishing system or document workflow will accept it. Do not assume a fixed percentage saving for your image; measure the downloaded candidates.

Inspect transparent edges on the intended background

A transparent logo can look correct on one background and reveal an unwanted border on another. View the exported PNG or WebP against the background on which it will actually appear. Check antialiased edges and any partially transparent shadow.

JPEG cannot preserve that transparency. If JPEG is mandatory, create an intentional background in an image editor before converting, then inspect the result. Tooliv’s format selector is not a background-color editor, so it should not be used to assume that a particular replacement color will be chosen.

The same principle applies to a product cutout: the visible result matters, not simply whether its original extension was .png.

Compare candidates without changing several variables

Use one source at one set of dimensions. Export the formats that the destination accepts. Record each candidate’s actual format, width, height, bytes, and visible defects. Compare them at the same viewing scale.

If one candidate is larger, that does not by itself mean the conversion failed. It may use a different compression method or preserve different information. A photograph stored as PNG can be useful in an editing workflow even when a smaller JPEG is more practical for the final upload.

Renaming photo.png to photo.jpg changes the filename, not the encoded image. Use the image converter to create a new encoding, and open the downloaded result in the receiving application. Tooliv checks the output format and reports a conversion failure if it cannot produce the requested format. If that happens, choose another format accepted by the receiver or try a compatible conversion workflow.

Treat animation and metadata as separate requirements

This workflow concerns still images. A format’s ability to hold animation does not guarantee that this conversion preserves every frame. If motion is required, use a workflow that explicitly supports animation and verify playback after export.

Likewise, do not assume that camera metadata, orientation tags, or color profiles survive every conversion. Keep the original for archival or editing purposes, and verify any required metadata in the intended application.

Once the chosen format works, follow the file-size guide if it exceeds the upload limit. The submission workflow brings the format, pixel, size, and content checks together before the final upload.