Converters
JPG to WebP Converter
Convert JPG to WebP to shrink photos further — WebP typically beats JPG at the same visual quality, with a quality slider to control the trade-off.
Convert images
Converting JPG to WebP by default — drop a JPG file below, or any JPG, PNG or WebP image; the format picker underneath lets you change the target.
Drop images here, or click to choose files
JPG, PNG or WebP · up to 25.0 MB each · 12 files at a time. Large or very high-resolution images are capped so a decode can't lock this tab.
WebP keeps transparency — no background needed.
Re-encoding a JPG as WebP compresses it a second time, not a first
A JPG has already been through one round of lossy compression by the time it reaches this converter — whatever detail the original camera or editing software's JPEG encoder decided to discard is already gone. Converting that file to WebP runs a second, independent lossy encoding pass on top of the first, which is a fundamentally different situation from converting a PNG (which hasn't lost anything yet) to WebP. The practical effect is usually small at a reasonably high quality setting — WebP's encoder is efficient enough that a second pass rarely introduces obvious new artefacts on top of what was already there — but it is a real, if usually invisible, second round of generation loss, not a neutral format swap.
How much smaller a WebP typically ends up next to its JPG source
At a similar visual quality, WebP's lossy encoder generally outperforms JPEG's, producing a smaller file for a comparable amount of visible detail. How much smaller depends heavily on the photo itself and the quality setting chosen — a highly detailed image with lots of texture shrinks less than a smoother one, and pushing the quality up narrows the gap between the two formats while pushing it down widens it. There's no single fixed percentage that applies to every photo, which is exactly why this tool shows the before-and-after size for the actual file you converted rather than a blanket estimate — the honest answer is always "depends on this image," not a number that holds for every JPG.
Why sites convert photos to WebP for page speed
A web page's load time is driven heavily by how many bytes of image it has to send before anything useful appears on screen, and photographs are usually the largest assets on an ordinary page by a wide margin. Because WebP tends to produce a smaller file than JPEG at a quality visitors can't tell apart, swapping a site's photos from JPG to WebP is one of the more reliable ways to shave real weight off a page without visibly changing anything a visitor sees — which is exactly why performance-focused checklists for websites routinely recommend it, and why so many sites now serve WebP by default to any browser that asks for it.
When the extra compression pass is not worth taking
If a JPG is already small, or if it's an image you'll want to edit further
and re-save more than once, converting it to WebP first adds a generation
of loss for comparatively little gain, and every future re-save of that
WebP compounds it further rather than resetting it. It's also not worth
doing for a JPG that's headed somewhere that specifically requires the
.jpg extension — a print submission, an upload form, an older piece of
software — since the smaller file becomes irrelevant the moment it has to
be converted right back. This conversion earns its keep for photos being
published or shared where file size genuinely matters and the destination
accepts WebP, not as a habit applied to every JPG by default.
Keeping the original JPG once you've made the WebP
Because this conversion involves a real second round of lossy compression, it's worth treating the WebP as a derived, disposable copy rather than the file you keep long-term — hold onto the original JPG (or better, the source it came from) as the version you'd go back to if you ever needed to re-export at a different quality or in a different format. Converting from the original JPG again next time, rather than converting an already-converted WebP a further step, avoids stacking a third round of generation loss on top of the first two.
Questions
- Does converting a JPG to WebP lose more quality?
- A small additional amount, yes, because the JPG has already been through one round of lossy compression and this conversion runs a second, separate pass on top of it — there's no way to fully avoid some further loss when re-encoding an already-lossy file into another lossy format. In practice, at a reasonably high quality setting the second pass is usually hard to notice next to the JPG it came from, since WebP's encoder is efficient enough that it doesn't need to discard much more to hit a similar visual quality. If the goal is genuinely zero further loss, the fix isn't a different quality setting on this conversion — it's starting from an uncompressed or less-compressed source instead of an already-saved JPG.
- How much smaller will my photos be after converting from JPG to WebP?
- It depends on the individual photo and the quality setting you choose, so there's no single number that applies across every image — a photo with a lot of fine texture and detail shrinks less than a smoother, lower-detail one at the same setting, and a higher quality setting narrows the size difference while a lower one widens it. What's consistent is the direction: at a comparable visual quality, WebP's encoder generally produces a smaller file than JPEG's for the same photo, which is the entire reason this conversion exists. This tool's before-and-after readout shows the real change for the specific file you converted, which is a far more useful number than any general estimate.
- Should I replace all the JPGs on my website with WebP?
- For photographs being served to visitors, usually yes — the size saving is close to free in visual terms and directly helps page load speed, which is why WebP has become close to a default choice for web photography. It's less clearly worth it for a JPG you plan to keep editing and re-saving repeatedly, since each conversion is a fresh round of lossy compression; keep an unconverted master for anything still being worked on, and only convert the final version you're actually publishing. And for the rare destination that specifically still requires a .jpg extension, converting isn't worth doing at all, since it just has to be undone.
- Will visitors on old browsers still be able to see my WebP images?
- For all realistic purposes, yes — WebP display support has been standard in every major current browser for a long time now, so a visitor running an up-to-date browser will simply see the image with no special handling needed. The remaining risk is a genuinely outdated browser that's stopped receiving updates entirely, which is a shrinking and increasingly rare population, or software outside the browser — an email client, a document viewer, certain older apps — that hasn't added WebP support. For a normal website audience, WebP compatibility is no longer the practical concern it was several years ago.