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Understanding Image Formats: PNG, JPEG, and WebP

Choosing the right image format matters. Each format has strengths that make it better suited to certain tasks, and using the wrong one can mean bloated file sizes, lost quality, or missing transparency.

PNG — Lossless Quality with Transparency

PNG (Portable Network Graphics) uses lossless compression, meaning no image data is discarded. This makes it ideal for graphics with sharp edges, text overlays, logos, icons, and screenshots. PNG also supports full alpha transparency, so you can place images on any background without a white box around them. The trade-off is file size: PNGs are typically larger than JPEGs or WebPs, making them less practical for photographs or large image-heavy pages.

JPEG — Small Files for Photographs

JPEG (Joint Photographic Experts Group) uses lossy compression. It throws away some image data that the human eye is unlikely to notice, resulting in dramatically smaller files. This makes JPEG the standard choice for photographs, editorial images, and any scenario where file size matters more than pixel-perfect accuracy. JPEG does not support transparency. At very low quality settings, compression artefacts become visible — blocky patterns and colour banding around edges. For most photographs, a quality setting between 80% and 92% strikes a good balance between size and appearance.

WebP — The Modern All-Rounder

WebP, developed by Google, supports both lossy and lossless compression as well as transparency. It consistently produces smaller files than PNG and JPEG at equivalent visual quality — often 25-35% smaller. All modern browsers support WebP, making it an excellent default for web use. The main reason to avoid WebP is compatibility with older software: some image editors, email clients, and legacy systems still do not recognise the format. If your image needs to work everywhere, JPEG or PNG remains the safer bet.

When to Convert

Convert to PNG when you need transparency or lossless quality for graphics. Convert to JPEG when you want the smallest file for a photograph and transparency is not needed. Convert to WebP when you are publishing to the web and want the best size-to-quality ratio. This tool handles all three conversions entirely in your browser using the Canvas API — your images are never sent to a server.