Most “free online converters” quietly upload your images to their server first. This one can’t, there is no server side at all, your browser does the whole conversion itself.
Free data tool
PNG & JPEG to WebP Converter
Convert images to WebP right in your browser. Your files are never uploaded, there's no server on the other end at all.
Drop PNG or JPEG images here
or click to choose files
Your browser can't encode WebP. It produced instead, the download would not really be WebP. Try Chrome, Edge or Firefox.
Conversion happens on your device using the browser's own image encoder. No uploads, no queue, no file-size limits beyond your machine's memory. Keep your originals, WebP output here is lossy web-delivery quality.
Why smaller images are worth the bother
Images are usually the heaviest thing on a page, and WebP typically lands 25-35% smaller than an equivalent-quality JPEG, and far smaller than PNG for photographic content. That difference shows up directly in load time and Core Web Vitals, which feed into how search engines assess your pages. Re-encoding happens at the quality you choose above, and the per-image size readout shows exactly what you saved before you download anything.
WebP converter FAQ
Why convert images to WebP at all?
WebP typically produces files 25-35% smaller than JPEG at comparable visual quality, and dramatically smaller than PNG for photos. Smaller images mean faster page loads, which matters for both visitor experience and Core Web Vitals. Every modern browser has supported displaying WebP for years.
Are my images uploaded to a server?
No, and that is the whole point of this tool. The conversion uses your browser's built-in canvas encoder, the image is decoded, re-encoded and downloaded entirely on your own machine. Nothing leaves your device, which also means there is no file size limit beyond your browser's own memory.
What quality setting should I use?
80% is a solid default for photos: visually near-identical to the original at a fraction of the size. Go higher (90%+) for images with fine text or sharp edges, lower (60-70%) for backgrounds and thumbnails where small artifacts are invisible. The size readout updates per image, so you can see exactly what each setting buys you.
Does WebP keep PNG transparency?
Yes. WebP supports alpha transparency, and this converter preserves it, a transparent PNG logo converts to a transparent WebP. JPEG has no transparency to begin with, so JPEG sources are unaffected either way.
Why did I get a PNG back instead of WebP?
A small number of older browsers (notably older Safari versions) can display WebP but cannot encode it. When a browser cannot encode WebP, its canvas silently falls back to PNG. This tool checks the actual output format and warns you instead of letting a mislabelled file through, if you see that warning, try Chrome, Edge or Firefox.
Is converting to WebP lossless?
Not at the quality settings this tool uses, it re-encodes with lossy WebP compression, the same trade-off as saving a JPEG. For photos, the quality loss at 80%+ is generally invisible in normal viewing. Keep your originals as masters; treat the WebP output as the web-delivery copy.
Free WebP converter by ANUPRESS
Why no-upload matters more for images than for text
Pasting a sentence into an online tool is one thing; uploading photos is another. Images carry EXIF metadata (location, device, timestamps), often show faces, documents, or screenshots of private dashboards, and once a file lands on someone else’s server you have no idea how long it’s kept. Converting locally with the browser’s own encoder removes that entire question, the file goes from your disk to your browser’s memory and back to your disk, and the network tab stays silent the whole time. It also means there’s no upload queue, no 5 MB limit, and it works offline once the page is loaded.
What the quality slider actually trades away
WebP at 80% quality is the sweet spot for photographs: side by side with the original, most people can’t point to a difference, and the file often lands at a quarter of the size or less. Pushing to 100% doesn’t mean lossless here, it means the encoder keeps far more detail and the file grows accordingly, worth it for images with fine text or hard edges. Going down to 60-70% suits thumbnails and background images where nobody looks closely. Because the size readout updates per file every time you move the slider, you can find each image’s own sweet spot in seconds instead of guessing.
Where WebP fits in a WordPress workflow
WordPress has accepted WebP uploads since version 5.8, so the simplest workflow is: convert here, then upload the .webp files to your media library exactly like any JPEG. Keep your originals as masters somewhere safe, treat the WebP copies as the delivery format. If your theme or an old plugin ever misbehaves with WebP, you still have the source files to fall back on, though with every modern browser displaying WebP for years now, that fallback is rarely needed anymore.
One honest caveat about older Safari
Every modern browser can display WebP, but a few older ones, mainly older Safari versions, can’t create it. On those browsers the built-in encoder silently produces PNG instead, and a less careful tool would let you download that PNG with a .webp name. This one checks what the encoder actually produced and tells you plainly when your browser can’t do the job, so the file you download is always really what its extension says it is.