JPG vs PNG vs WebP: Which Image Format Should You Choose?

JPG, PNG, and WebP are the three most widely used image formats on the internet. They are not interchangeable — each was designed for a specific type of image content and a specific use case. Using the wrong format for your content either produces unnecessarily large files or permanently degraded quality. This guide settles the question definitively.

The Short Answer

JPG (JPEG): The Universal Lossy Format

Developed: 1992 | Compression: Lossy | Transparency: No | Animation: No

JPG is the oldest and most universally supported of the three formats. It was specifically designed for photographic content — images with smooth tonal gradients, complex textures, and subtle colour variations. Its lossy compression algorithm (based on the Discrete Cosine Transform) exploits the human visual system's reduced sensitivity to high-frequency detail.

Best for: Photographs, scanned documents, any image that will be viewed at standard screen resolution.

Worst for: Logos, text, screenshots, and any image with flat colours and sharp edges. JPG's compression creates "ringing" artefacts around sharp edges that are clearly visible on text and line art.

File size: Medium. A 1080×1080 photograph at Q85 is typically 180–300 KB.

PNG: The Lossless Format

Developed: 1996 | Compression: Lossless | Transparency: Yes (alpha channel) | Animation: No (APNG is non-standard)

PNG stores every pixel exactly as encoded — no data is ever discarded. This makes it ideal for content where pixel-perfect accuracy matters: logos, icons, screenshots, and any image with text.

Best for: Logos and brand assets, screenshots, graphics with flat colours and sharp edges, images requiring transparency.

Worst for: Photographs. A PNG of a photograph is 5–10× larger than the equivalent JPG with no visible quality benefit.

The transparency advantage: PNG is the only mainstream format (besides WebP) that supports alpha channel transparency. This makes it essential for logos and UI elements that must appear over arbitrary backgrounds.

File size: Large for photographs (2–8 MB for a typical 1080×1080 photo), small to medium for graphics (50–500 KB).

WebP: The Modern Successor to Both

Developed: Google, 2010 | Compression: Lossy and lossless | Transparency: Yes | Animation: Yes | Browser support: 97%+

WebP was designed to be a single format that replaces both JPG and PNG on the web. Its lossy mode outperforms JPG by 25–34% at equivalent quality. Its lossless mode outperforms PNG by 26%. It also supports transparency and animation.

Best for: Any image served on a modern website. It is the default format served by Google Images, major CDNs, and e-commerce platforms for good reason.

Limitations: Not supported in Microsoft Office (pre-2019 versions) or some legacy software. Some print shops do not accept WebP. Use JPG or PNG for offline / print contexts.

File size: Smallest. A 1080×1080 photograph at WebP Q85 is typically 120–200 KB — 30–40% smaller than an equivalent JPG.

Direct Comparison at Equivalent Quality (1920 × 1080 Photograph)

The Decision Tree

Will the image be on a website?
  YES → Use WebP (with JPG fallback if needed)
  NO  → Continue below

Is it a photograph?
  YES → Use JPG (Q85 for general, Q95 for print)
  NO  → Does it have transparency?
          YES → Use PNG or WebP
          NO  → Does it have text, logos, or flat colours?
                  YES → Use PNG
                  NO  → Use JPG