Convert JPG to WebP
WebP encodes photos 25–35% smaller than JPEG at the same visual quality, which translates directly into faster page loads. One tip: both formats are lossy, so convert from your original JPG once rather than re-converting already-compressed copies.
Need the other direction? Convert WebP to JPG
How it works
Add your JPGs — drag them in, browse, or paste — and the WASM encoder begins re-encoding each photo at quality 80 immediately.
Compare the before/after sizes shown per photo; expect roughly a quarter to a third off at identical viewing quality.
Raise the quality toward 90 for portfolio shots or drop toward 70 for thumbnails, then grab single files or the whole zip.
JPG vs WebP
Between these two, the deciding number is 25–35% — that is what WebP shaves off a JPEG at matching visual quality. My verdict: WebP for every photo you serve on a page, JPG only where the file leaves the web for inboxes, prints or older software.
| JPG | WebP | |
|---|---|---|
| Compression | Lossy | Lossy or lossless |
| Transparency | No | Yes (full alpha) |
| Animation | No | Yes |
| Support | Universal — the safest format there is | All current browsers (since 2020) |
| Best for | Photographs and strict upload forms | Web images: photos, thumbnails, UI assets |
Frequently asked questions
No — that is the whole reason I built this. The conversion runs in your browser using WebAssembly, so your files never leave your device; there is no server in the loop at all. It also means the tool keeps working offline once the page has loaded, and there is no file size limit beyond your device’s memory.
Both JPG and WebP are lossy, so any re-encode involves some loss — but at quality 80 and above, WebP preserves the visible detail of the source in a noticeably smaller file. For pixel-critical work, convert from the original rather than from an already heavily compressed copy.
Quality 75–85 is the sweet spot for web photos: visually indistinguishable from the source at a fraction of the size. Go higher (90+) for photography portfolios, lower (60–70) for thumbnails where size matters most.
WebP uses prediction-based coding borrowed from the VP8 video codec: it predicts blocks of pixels from their neighbors and stores only the difference. On most images that is simply more efficient than JPEG’s 1992-era approach.
On the web, essentially yes — 25–35% fewer bytes at matching quality, supported by every current browser. Off the web it gets murkier: email clients, print shops, government portals and older desktop apps still expect JPG. My rule: WebP for anything you serve, JPG for anything you send.
Photos that leave your control: attachments, marketplace uploads, files for a print shop or an older CMS. Also camera originals — the JPG out of your camera is your negative, so archive it untouched and export WebP copies for publishing. If a platform rejects WebP after the fact, WebP to JPG reverses the trip.
Related tools
Convert PNG to WebP
Convert PNG to WebP in your browser — free, no upload, no signup. Keeps alpha transparency, cuts file size by 60–90%, and shows the exact savings per file.
Convert JPG to AVIF
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Convert WebP to JPG
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