Emailing a landscape photo, handing a designer a logo with a transparent background, and sharing a screenshot with tiny lettering are three different jobs. To choose a file format, first look at what the image contains. Then find out where the recipient will open it. With both answers in hand, deciding between JPEG, PNG and WebP becomes much easier.

How lossy and lossless saves differ

Lossy compression discards some image information to produce a smaller file. The amount and appearance of the resulting detail loss depend on the encoder, the image and the setting. Lossless compression lets you recover the pixel values supplied to the encoder. If you convert colours, crop or resize before exporting, the new file preserves the result of that operation.

For example, you can save an existing JPEG as PNG to preserve the pixels you have without another lossy JPEG save. The conversion cannot recover strands of hair or colour transitions already softened in the JPEG. The PNG copy can be useful if you plan to keep editing, and it may be larger than the source JPEG.

Try JPEG for photos and broad compatibility

Everyday JPEG files use lossy encoding. It is a practical starting point for still photos with faces, landscapes and smooth colour changes. If an application form accepts only JPG or PNG, you can export a photograph as JPEG and check the form's size limit separately. An ordinary JPEG export fills transparent edges with a background colour. JPEG committee overview of JPEG 1

When comparing JPEG exports, inspect fine lines and high-contrast edges alongside the main subject. An aerial against a bright sky, a seam on a dark jacket, or tiny lettering on a product can make heavy compression easier to spot. A slightly higher quality setting or a separate close-up can help if one of those details matters.

Try PNG for sharp lines and transparent edges

PNG is a lossless format that can carry transparency. It is a useful starting point for an interface screenshot with small lettering or a logo that needs to sit on different backgrounds. Open a transparent logo on white and on a dark surface. If you see an unexpected pale outline, check the export settings, the layer background if present, and the partially transparent pixels along the edge. W3C PNG specification

PNG alone cannot make small lettering legible. When a wide desktop screenshot is fitted into a chat bubble, its text can look small even if the original pixels are still there. Crop more closely around the relevant area or include a detail image with the overview. The geometry of the image and the width at which people see it are separate decisions from the file format.

When to include WebP in your comparison

WebP offers lossy and lossless encoding and supports transparency. For a web photograph, compare lossy WebP against a JPEG at the same dimensions. For a logo or interface screenshot, compare lossless WebP with PNG. A browser, publishing tool, editor and submission form may accept different formats. Once you know where the file is going, test it through that exact workflow. Google WebP format guide

Your website may display WebP while a client uses an older delivery workflow. Make separate copies for the site and the handoff if needed. When a JPEG is required, go back to the original or your latest lossless edit if you can. Renaming the file extension does not convert the contents.

Run a short test with three files

First, export a photograph as JPEG and lossy WebP at the same pixel dimensions. Compare the sizes and inspect the edges and smooth transitions in one viewer. Second, export a transparent logo as PNG and lossless WebP. Check it on light and dark backgrounds, then try opening it in the recipient's app. Third, export a screenshot with fine lettering in a lossless format and reopen it on a phone.

Keep the outcome in a short note or in the file names. You might choose JPEG for photo delivery, PNG for brand assets and WebP for web cards. Repeating these checks on a later project gives you a useful workflow without having to rely on one extension for every job.