WebP and JPG are two of the most common image formats for the web, but WebP typically delivers the same visual quality in a file that is 25-34 % smaller. This difference matters: every extra kilobyte slows page loads, increases mobile data usage, and can lower search rankings. JPG, introduced in 1992, is supported by every browser, email client, and photo app on the planet. WebP, launched by Google in 2010, is now supported by over 95 % of global browsers (per caniuse.com), yet some legacy systems—older versions of Safari, Internet Explorer, or enterprise software—still reject it. When you need to send a photo to someone who can’t open WebP, or when you want to shrink a JPG without losing detail, you need a quick, private way to convert between the two formats.

That’s where the Webp Converter comes in. It runs entirely in your browser, so your images never leave your device. You can convert one file or a dozen in a single batch, adjust quality on the fly, and download the results instantly. The tool also handles PNG, so you can switch between all three major web formats without juggling multiple apps or websites.

webp vs jpg
webp vs jpg

Key differences between WebP and JPG

The table below compares the two formats at a glance.

Feature WebP JPG (JPEG)
Compression type Lossy or lossless Lossy only
Transparency (alpha channel) Yes No
Animation support Yes No
Typical file size (same quality) 25-34 % smaller than JPG Larger than WebP
Browser support Modern browsers (95 %+ global coverage) Universal (100 %)
Editing & re-saving Lossless mode preserves quality; lossy mode degrades like JPG Each re-save degrades quality
Best for Web pages, apps, and anywhere speed matters Printing, email attachments, legacy systems

WebP’s smaller file size comes from more advanced compression algorithms. While JPG uses a single method (discrete cosine transform), WebP combines predictive coding, entropy coding, and a newer block-based approach derived from the VP8 video codec. The result is sharper edges and smoother gradients at the same bitrate. In practice, this means a 1 MB JPG photo can often be converted to a 650 KB WebP file without any visible difference—saving 35 % of bandwidth.

When to use WebP instead of JPG

Use WebP whenever speed, bandwidth, or storage space is a priority and you know your audience uses modern browsers or apps. Common scenarios include:

  • Website images: product photos, blog illustrations, hero banners, and thumbnails.
  • Mobile apps: screenshots, icons, and in-app galleries that need fast loading.
  • Social media: profile pictures and post images that must upload quickly on slow connections.
  • Cloud storage: personal photo libraries where every gigabyte counts.

WebP also supports transparency and animation, so it can replace both PNG and GIF in many cases. If you’re designing a logo or an icon that needs a transparent background, WebP gives you the same crisp edges as PNG but in a smaller file. For simple animations (like a loading spinner), WebP can replace GIF and cut file size by 60-80 % while keeping smooth motion.

When to stick with JPG

Use JPG when compatibility is more important than file size. Examples include:

  • Printing: professional labs and home printers expect JPG or TIFF files.
  • Email attachments: some corporate email systems block WebP files.
  • Legacy software: older versions of Photoshop, Lightroom, or desktop viewers may not open WebP.
  • Sharing with non-technical users: grandparents, clients, or colleagues who may not have updated their devices.

JPG is also the safer choice if you plan to edit the image multiple times. Every time you open, edit, and re-save a JPG, it loses a little more quality. WebP’s lossless mode avoids this problem, but not all editors support it. If you’re working on a photo that will go through several rounds of tweaks, start with a high-quality JPG or a lossless format like PNG, then convert to WebP only for the final web version.

Convert JPG to WebP (or WebP to JPG) in your browser

Here’s how to convert between the two formats using the Webp Converter tool:

  1. Open the Webp Converter in your browser.
  2. Click Browse images and select one or more JPG, PNG, or WebP files from your device. The tool loads them instantly without uploading.
  3. Choose your target format:
    • To convert JPG to WebP, select WebP.
    • To convert WebP to JPG, select JPG.
  4. For WebP or JPG, drag the quality slider to balance file size and clarity. The preview updates in real time, and you’ll see the before-and-after file sizes below each image.
  5. Click Download to save each converted image to your device. You can download them one by one or all at once as a ZIP file.

The entire process happens locally in your browser, so your images never touch a server. This means faster conversions, no privacy concerns, and no need to install software or create an account.

How to check if your browser supports WebP

Before you convert a batch of images to WebP, make sure your audience can view them. Here’s how to test your own browser:

  1. Open a new tab and go to caniuse.com/webp.
  2. Scroll to the “Global support” section. If your browser supports WebP, you’ll see a green checkmark and a percentage (e.g., “95.4 %”).
  3. For a quick hands-on test, right-click any image on a modern website (like Google Images) and select Save image as. If the file extension is .webp, your browser supports it.

If you discover that some of your users can’t view WebP, you can use the Webp Converter to switch back to JPG or PNG. The tool also lets you create fallback versions of the same image, so you can serve WebP to modern browsers and JPG to older ones using the HTML <picture> element.

Beyond WebP and JPG: other formats to consider

While WebP and JPG cover most web use cases, two other formats are worth knowing:

  • PNG: Best for images that need transparency or lossless quality, like logos, icons, and screenshots. PNG files are larger than JPG or WebP, but they don’t degrade when edited. Use the JPG to PNG converter if you need to switch formats.
  • AVIF: A newer format that can be up to 50 % smaller than WebP at the same quality. It’s supported in Chrome, Firefox, and Edge, but not yet in Safari or older browsers. If you’re targeting a tech-savvy audience, AVIF can save even more space, but for now, WebP is the safer choice for broad compatibility.

For most users, WebP is the best balance of size and compatibility. If you’re unsure which format to use, start with WebP for web images and JPG for everything else. When you need to switch, the Webp Converter makes it a one-click job.

Related guide: JPEG vs PNG vs WebP: Which Image Format Should You Use?.

If you're weighing options, When to Use JPG or PNG and How to Convert Between Them covers this in detail.