WebP usually gives smaller files and keeps transparency. This converter saves WebP as a still image, so animation is not written.
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What is a JPG to WebP converter?
A JPG to WebP converter re-encodes JPEG photographs as WebP, the image format Google released in 2010 for the web. On most sites it exists for one reason: bytes. Google puts lossy WebP files at 25 to 34 percent smaller than JPEG at comparable quality, and images are usually the heaviest thing a page asks a visitor to download, well ahead of scripts and fonts.
Think of a catalogue page carrying dozens of product photographs. Convert the folder here and each row shows the size before and after and how much smaller or larger the WebP is, so you can add up what the page saves. On a phone on a slow connection that is the difference between a page that settles and a page somebody leaves. Doing it for a whole product range is why bulk conversion matters more here than on any other pair.
Support stopped being the objection some years ago. Chrome and Edge have read WebP for a long time, Firefox added it in version 65, and Safari in version 14, which brought iOS along with it. What still catches people out is everything that is not a browser. Some email clients, older CMS uploaders and a handful of desktop applications refuse a .webp file outright, which is why converting back to JPG is one of the most searched image tasks there is. Use WebP for the web and keep a JPG for anything you have to email or hand to a stranger.
One caution is worth repeating. A JPG is already lossy, so encoding it as WebP is a second pass and the quality you start from is the ceiling. Convert from the largest, least compressed original you have rather than from a copy that has been through a chat app. The Quality slider runs from 10 to 100 and starts at 90%, and 80 to 85% is where most photographs stop showing a visible difference on screen. Conversion runs through a canvas in your browser, which drops EXIF and GPS data, a genuine privacy gain when the file is about to go on a public site. Several files convert at once and download as a ZIP. Free, no signup, client-side, with a daily limit on conversions.
How to convert JPG to WebP
Add the JPG files
Drag a whole folder of photographs onto the box reading Drop JPG images here or click to upload. Every file gets a row and starts converting to WebP as soon as it is added.
Adjust the quality
The Quality slider runs from 10 to 100 and starts at 90%. For images going on a website, 80-85% is the usual sweet spot. Moving the slider converts every added file again about 300 ms after you stop, so a drag converts once, and it does not count against your daily limit again.
Check each result
Each row shows a thumbnail, its status and a size line with the size before and after and how much smaller or larger the WebP is, so you can read the saving per image rather than guessing at it. Click the thumbnail to see the WebP large and switch between Before and After.
Download the results
Save a single image with the download icon on its row, or use Download All (n images) in the list header to take the batch as converted-webp.zip with duplicate names numbered.
Why convert JPG to WebP?
A JPG that already looks fine is a strange thing to re-encode, so the reasons are worth being clear about. They almost all come down to where the image is going to be served from.
Pages that load faster
On a typical page the largest element in view is often a photo, and how quickly that photo arrives shapes how fast the page feels. Every kilobyte saved on the hero image, the product shots and the blog thumbnails is a kilobyte a visitor on mobile data does not wait for.
Lower storage and bandwidth for large libraries
A single photo saving a modest amount is not worth the effort. Thousands of photos in a shop, a portfolio or a documentation site are different, because the saving applies to every copy stored and every copy served. This is where converting a whole folder at once pays for itself.
Galleries and thumbnail grids
Grid pages request dozens of small images at once. Smaller files mean the grid fills in sooner, and a lower quality setting is easier to justify when each image is shown at a fraction of its real size.
JPG vs WebP: which to use
| Feature | JPG | WebP |
|---|---|---|
| Compression | Lossy, working on 8 x 8 pixel blocks. | Lossy or lossless modes, with lossy based on the VP8 video codec. |
| Transparency | None. | Supported, but a WebP made from a JPG has nothing transparent to carry. |
| Animation | No. | The format can animate. This converter writes still images only. |
| Typical file size | The baseline most sites start from. | Often smaller than JPG at similar visual quality. |
| Color depth | 8 bits per channel. | 8 bits per channel. Lossy WebP always stores color at half resolution. |
| Browser and software support | Opens practically everywhere. | Every current browser. Some email clients and older desktop apps refuse it. |
| Best for | Email attachments, printing, sending to people. | Images served on your own website. |
Understanding WebP quality
The Quality slider sets how much detail the WebP encoder is allowed to throw away, from 10 to 100. The number is not shared with JPEG. A JPG saved at 90 and a WebP saved at 90 are produced by different encoders with different scales, so matching the numbers does not match the look or the size.
The encoding is done by your browser, so the same image at the same setting can come out a slightly different size in different browsers. Each row shows both file sizes, and its thumbnail opens a preview with Before and After views, which is a more reliable guide than the number on the slider.
Because the source is already a JPG, WebP is compressing an image that has lost detail once. It cannot tell JPEG artifacts from real texture and spends bytes preserving both. The cleaner the JPG you start from, the more the WebP encoder can save. Lossy WebP also stores color at half the resolution of brightness, which can soften thin colored lines and small red or blue text.
Privacy and security
- Photos are converted client-side by the browser's own Canvas API. No WebAssembly codec is fetched and no image is sent to a server.
- Before converting, the page checks your daily limit with a request carrying the tool name, a device identifier and, if you are signed in, your account token.
- After converting, it logs how many files were processed, their combined size and the target format. Names, dimensions and pixel data are not part of that log.
- Camera details, GPS coordinates and color profiles in the JPG are left out of the WebP, which is useful before photos go on a public site.
- If the limit check cannot reach the server, conversion still goes ahead, so the page keeps working offline after it has loaded.
Key Features
Smaller files at the same quality
WebP encodes photographs more efficiently than JPEG, which is the whole point of the conversion. Each row prints the before and after sizes so the saving is a number, not a promise.
Quality slider from 10 to 100
Set the trade-off yourself rather than accepting a fixed preset. The default is 90%, and dropping to 80% typically takes a useful bite out of every file in the batch. Moving the slider converts every added file again, so the new sizes show without adding anything twice.
Built for whole folders
Convert an entire image directory in one pass and collect it as converted-webp.zip, which is the realistic way to migrate a site rather than one photo at a time.
EXIF and GPS are stripped
Re-encoding through a canvas leaves metadata behind, so camera details and location coordinates do not travel with a photo you are about to publish.
Frequently Asked Questions
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