Convert JPG to WebP
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What is a JPG file?
JPEG has been the default photograph format since 1992, and its longevity is its own argument — it opens everywhere, on everything, forever. What it cannot do is compete on size with a codec designed thirty years later.
WebP typically produces files 25-35% smaller than JPEG at the same visible quality, using the intra-frame compression from Google's VP8 video codec. For anything served over a network that is a straightforward win, and it is why most large sites now deliver WebP to any browser that will take it. Since Safari 14 in September 2020, that is all of them.
Why convert JPG to WebP?
- Files come out roughly 25-35% smaller at the same visible quality, which is a direct saving on page weight and bandwidth.
- Faster pages. Images are usually the largest thing a page downloads, so this is one of the highest-leverage web performance changes available.
- WebP supports an alpha channel, so you are no longer locked out of transparency the way JPEG locks you out.
- Core Web Vitals: image weight feeds directly into Largest Contentful Paint, which Google uses as a ranking signal.
- Every current browser supports it, so for web delivery there is no longer a compatibility reason to stay on JPEG.
JPG compared with WebP
| Attribute | JPG | WebP |
|---|---|---|
| Compression | DCT, standardised 1992 — universal, but 30 years behind on efficiency | VP8 intra-frame — 25-35% smaller at equal visible quality |
| Support | Every browser, operating system and image tool since 1992 | Every current browser since Safari 14 (2020); patchy in desktop and print software |
| Transparency | No — JPEG has no alpha channel at all | Yes — full alpha channel, in both lossy and lossless modes |
| Metadata | EXIF and GPS (stripped here by default) | EXIF, XMP and ICC (stripped here by default) |
| Typical size | ≈350 KB for a 12 MP photo at quality 82 | ≈240 KB for the same photo at the same visible quality |
What actually changes
Both formats are lossy, so this is a second lossy pass — WebP cannot restore anything JPEG already discarded, and it will faithfully preserve any artifacts that are already there. Converting a heavily compressed JPEG produces a smaller file containing the same flaws.
Because of that, quality settings do not carry across. A JPEG saved at quality 80 does not need WebP quality 80 to look identical; WebP typically reaches the same perceived quality several points lower. We default to 82, which is comfortably above the point where the difference is visible at normal viewing sizes.
WebP is a delivery format, not an archival one. Keep your original JPEG as the master and treat the WebP as the copy you publish — re-encoding the WebP back to JPEG later would be a third lossy pass.
Where WebP genuinely loses to JPEG is reach outside the browser: print services, older desktop software and plenty of upload forms still refuse it.
Frequently asked questions
How much smaller will the WebP be?
Typically 25-35% at the same visible quality. The saving is largest on photographs with smooth gradients and smallest on images that are already heavily compressed, because there is less redundancy left to exploit.
Will converting lose quality?
A little. JPEG is already lossy, so this is a second lossy pass and WebP cannot recover what JPEG discarded — it will also faithfully preserve artifacts that are already in the file. At quality 85 and above the additional loss is not visible at normal viewing sizes.
Should I use the same quality number as my JPEG?
No — the scales are not comparable. WebP generally reaches the same perceived quality several points lower than JPEG, so matching the numbers wastes bytes. Start at our default of 82 and lower it if the file needs to be smaller.
Is it safe to serve WebP to everyone?
For browsers, yes — every current one has supported it since Safari 14 in September 2020. For files you email or send to a print service, stay with JPEG: support outside the browser is still inconsistent.
Nothing is uploaded — and you can check
Conversion happens on your own device, inside this browser tab. There is no server to receive your files, which is a stronger guarantee than a promise not to look at them. Open your browser's developer tools, switch to the Network tab, and convert something: you will see no request carrying your image. The page keeps working with your network disconnected.