Why convert JPG to WebP
JPG has run the web's photography for thirty years, and it is still fine. But "fine" is not "efficient." WebP uses newer compression math, and on a normal photograph it reaches the same quality in noticeably fewer bytes — usually 25–35% fewer. Multiply that across a gallery, a product catalog, or a blog's worth of headers and you have shaved real seconds off your load time.
Speed is not a vanity metric. It moves search rankings, it moves bounce rates, and on mobile data it decides whether the image shows up before the reader scrolls past. Converting your JPGs to WebP is one of the cheapest performance wins available — you change the file, not the page.
There is a subtlety worth being honest about. A JPG is already lossy; some detail was discarded when it was first saved. Re-encoding to WebP can't bring that back, and in theory it removes a hair more. In practice, at quality 75–85, nobody can pick the WebP from the original in a blind test. You get the smaller file for free.
Convert JPG to WebP in three steps
- Drop your JPGs inOne photo or a whole shoot. Files load into memory instantly — there is no upload, because the work happens on your device.
- Keep WebP as the outputQuality sits at 75 by default, which is the safe balance of size and fidelity. Slide it up for archival shots, down when you want the smallest possible file.
- Download your WebPTake one file, or export the whole batch as a ZIP with original names preserved.
JPG vs WebP for photos
| JPG | WebP | |
|---|---|---|
| Compression | Older, less efficient | Modern, ~25–35% smaller |
| Transparency | No | Yes (optional) |
| Best for | Legacy compatibility | Web delivery, speed |
| Browser support | Universal | All modern browsers |
If an old tool or an email client somewhere still chokes on WebP, keep a JPG copy for that one case — or convert back later with WebP to JPG. For the website itself, WebP is the format that earns its keep.
Private by design
Compressly does the whole conversion in your browser. The libwebp encoder — the same one Chrome ships with — is compiled to WebAssembly and runs on your machine. Nothing is uploaded, nothing is stored, and there is no server that could leak your photos later. You can prove it: open DevTools, watch the network tab, convert a file, and see that no image request ever fires.
More conversions
Questions
Is WebP really smaller than JPG?
Yes — usually 25–35% smaller at matched quality. It uses more modern compression than JPG's decades-old method.
Will the photo look worse?
At quality 75–85 the WebP is visually identical to the source. The difference is in the file size, not on the screen.
Can I batch-convert JPEGs?
Yes. Drop the whole folder and download a ZIP. The free tier does 20 files per batch; Pro removes the limit.
Does anything get uploaded?
No. The encoder runs in your browser via WebAssembly. Your files never leave your device.