Use JPG (or JPEG) for photographs, PNG for graphics with text or transparency, and WebP when you need smaller file sizes and can control what software your recipient uses. That is the short answer. Each format has strengths and trade-offs, and the right choice depends on what you are sharing and who needs to open it.

How JPG, PNG, and WebP Actually Work

JPG uses lossy compression, which means it discards some image data to make the file smaller. This works well for photographs because the human eye does not notice the missing detail in smooth colour areas. The trade-off is that every time you edit and re-save a JPG, you lose a little more quality. JPG does not support transparency, so you cannot have a transparent background.

PNG uses lossless compression. No data is thrown away, so every pixel stays exactly as it was. PNG also supports transparency, which is why it is the standard for logos, icons, and screenshots. The cost is file size: a photograph saved as PNG can be several times larger than the same photo saved as JPG.

WebP is a newer format from Google that supports both lossy and lossless compression. It also handles transparency and animation. Google reports that lossy WebP files are about 25 to 34 percent smaller than comparable JPEGs. That makes a real difference when you are serving images on a website or sending many files.

When to Choose JPG

JPG is the safest choice for general use. It is accepted almost everywhere, including email attachments, upload forms, and older software. If you are sending a photo to someone and you are not sure what they can open, pick JPG.

  • Photographs: JPG gives a good balance of quality and file size. A typical phone camera saves photos as JPG by default.
  • Social media posts: Most platforms convert uploads to JPG anyway.
  • Email attachments: JPG files are small enough to send quickly, and almost every email client displays them.

Remember that JPG has no transparency. If you need a transparent background for a logo or a graphic to place over another image, do not use JPG.

When to Choose PNG

PNG is the best format for images where sharp edges and exact colours matter. Because it is lossless, text and line art stay crisp. Transparency works perfectly, so you can place a PNG logo on any background without a white box around it.

Good uses for PNG

  • Screenshots: Text in menus and buttons stays readable. JPG compression often makes text look blurry.
  • Logos and icons: Transparency and sharp edges are essential.
  • Graphics with text: Charts, diagrams, banners with words.
  • Images you plan to edit repeatedly: Saving as PNG avoids the quality loss that happens with repeated JPG saves.

The downside is file size. A high-resolution photograph saved as PNG can be huge. For photos that you only share once or twice, JPG or WebP is usually better.

When to Choose WebP

WebP gives you the best of both worlds: you can use lossy compression for photos (smaller than JPG) or lossless compression for graphics. It also supports transparency and animation, which means a single file can replace both a PNG and a GIF in many cases.

All current major browsers display WebP, so it works fine on the web. The problem is compatibility with older software and some upload forms. If you are sending an image to a client who uses an old image editor, or if you are uploading to a government or business portal, the form may reject WebP. In those situations, stick with JPG or PNG.

If you control the environment, for example on your own website or in a modern app, WebP is a strong choice. The smaller file size means faster loading without sacrificing visible quality.

A Simple Rule for Everyday Decisions

When you are not sure, follow this rule:

  • Photos: Use JPG or WebP. JPG if you need maximum compatibility. WebP if you want a smaller file and know the recipient can open it.
  • Graphics and screenshots: Use PNG. The lossless quality and transparency are worth the larger file size.
  • Unsure what the recipient can open: Use JPG. It is the safest format for email, upload forms, and older software.

Having the right format matters, but so does having a quick way to convert between them. A free JPG converter like jpg.now handles JPG, PNG, WebP, HEIC, PDF, and more without requiring a sign-up. It also includes utilities for checking image info, calculating file sizes, and finding social media image dimensions.