MultiKit

JPG to WebP Converter: Make Photos Smaller

  • Free
  • No sign-up
  • Runs in your browser
  • Version 1.0.4
  • Last updated 2026-11-02
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Turn JPG photos into WebP, which is usually clearly smaller at a similar look. It is a quick way to make a page load faster or to fit under a size limit.

    Everything you enter is processed in your browser and is never sent to a server.

    Browsers:Chrome57+Edge79+Firefox52+Safari15+Opera44+Samsung Internet7.0+Browsers

    How to use

    1. Drop your .jpg files onto the box, or choose them. You can add up to 50 at once.
    2. Choose the quality. 80 is a good start. Lower gives a smaller file; higher keeps more detail. You can also shrink the size.
    3. Download each WebP, or press Download all to get a ZIP. The size of each result is shown beside it.

    Examples

    holiday.jpg
    → holiday.webp, smaller at quality 80
    The size of each file is shown so you can compare.
    scan.jpeg
    → scan.webp
    .jpeg and .jpg are the same format.
    photo.jpg at quality 100
    → A larger WebP with more detail kept
    Raise the quality only if you see flaws.
    A 4000 × 3000 photo, scaled by 50 percent
    → A 2000 × 1500 WebP
    Half the width and half the height is a quarter of the pixels, which usually cuts the file size far more than a change in quality does.
    A 4000 × 3000 photo, height set to 1080
    → A 1440 × 1080 WebP
    Setting only the height keeps the proportions, so the width follows.

    How it works

    This page is the image converter with JPG to WebP already chosen. Your browser decodes the JPG and the WebP is written by libwebp, Google’s encoder, compiled to WebAssembly. Camera data such as the date and location is not copied, because the picture is redrawn.

    Where the saving comes from

    Both formats throw away detail the eye is least likely to notice, but WebP predicts each block of pixels from its neighbours before storing the difference, which lets it spend fewer bytes on smooth areas such as sky and skin. The quality number decides how much is discarded, and the page shows the result of your setting, not a promise: the same quality gives a different saving on a foggy landscape and on a photo of fine fabric.

    Saving more than the quality allows

    The quality setting is not the strongest lever. The number of pixels is. A photo from a recent phone can be 4000 × 3000 pixels, far larger than a web page ever shows. Scaling by 50 percent leaves a quarter of the pixels, and setting a width of 1600 keeps the proportions at 1600 × 1200. Do this first, then lower the quality only if the file is still too large.

    Do not convert twice

    Each time a picture is saved as a lossy file, some detail is lost, and it adds up. Convert the original camera JPG once, and keep the original. A WebP saved from a WebP, or a JPG that was resized and saved several times before, will show blotches around edges sooner than a first-generation file.

    Sources

    Frequently asked questions

    Is WebP really smaller than JPG?
    Usually, at a similar look. How much depends on the picture, so the page shows the size of every result. If a WebP comes out larger, keep the JPG.
    Does converting JPG to WebP lose quality?
    A JPG is already lossy, and writing it again as a lossy WebP discards a little more. At quality 80 and above it is hard to see. For the best result, convert from the original, not from a copy that was already converted.
    Will every program open the WebP?
    Every current browser does. Some older programs, e-mail clients, print services and upload forms do not, and for those keep the JPG.
    What happens to the photo's date and location?
    They are not carried over: the new file holds the picture only, which also makes it safe to share.
    How much smaller is it?
    Google says lossy WebP typically achieves about 30% more compression than JPEG on average. A single photo can be above or below that, and a photo that was already saved at a low JPG quality may save less, since there is little left to remove.
    Will the WebP be sharper if I use quality 100?
    It keeps more detail, but it cannot restore what the JPG already lost, and the file can end up as large as the JPG or larger. It is lossy even at 100.
    Which is better for a photo on my website?
    WebP, with a JPG kept as the original. All current browsers show WebP, so it is a safe choice for pages, while a JPG remains the format that nearly every camera, program and printer accepts.
    Can I convert many photos at once?
    Yes, up to 50 at once, each downloadable alone or all together as a ZIP. Photos with the same name get -2, -3 added in the ZIP so none overwrites another.
    Are my pictures uploaded?
    No. They are converted in your browser.

    Guides

    Version history
    • 1.0.4 — Adds where the saving comes from, why scaling the size saves more than lowering the quality, why not to convert twice, and more examples and questions.
    • 1.0.3 — Puts the format and quality options and the size options on one line on a wide screen, instead of two lines with empty space beside them.
    • 1.0.2 — Makes the search title and description state the supported task, key formats and privacy benefit more clearly.
    • 1.0.1 — Reports conversion completion and failure to connected workflows, so batch runs wait for the full result and ignore cancelled or superseded work.
    • 1.0.0 — First release.

    Last updated: