JPG to WebP Converter
Use the CaseSwitch JPG to WebP Converter to re-encode JPEG photos as WebP in your browser with a quality control. Typical goal: smaller files at similar visual quality for the modern web. Nothing is uploaded.
Written by the CaseSwitch editorial team. We maintain these tools in the browser so drafts, keys, and images stay on your device.
Last reviewed: 23 July 2026
Images are converted in your browser with the Canvas API. Nothing is uploaded.
Drag and drop a JPG here, or choose a file
Examples
Hero photo optimization
Input
hero.jpg (~2.4 MB)
Output
hero.webp · often ~30–50% smaller at quality ~0.85 (varies)
High quality preserve look
Input
portrait.jpg · quality 0.92
Output
portrait.webp · closer to source, modest savings
Aggressive size cap
Input
banner.jpg · quality 0.7
Output
banner.webp · smaller; check skin tones and gradients
EXIF stripped note
Input
phone.jpg with GPS
Output
phone.webp · canvas export typically drops EXIF/GPS
Fallback reminder
Input
Need legacy email attachment
Output
Keep JPG or use WebP→JPG later — do not send only WebP to old clients
How to use
- Upload a JPG/JPEG.
- Set WebP quality (0.8–0.9 is a common starting band; default is 0.92).
- Download the `.webp` and compare size and sharpness to the source.
What this tool is for
Shrink JPG assets for blogs, heroes, and performance work when your audience’s browsers support WebP (current Chrome, Firefox, Safari, and Edge do). Quality defaults to 0.92 (0.1–1). Processing is local Canvas → `image/webp`.
How it works
The JPEG is decoded, drawn to a canvas, and exported with `toBlob` as WebP at your quality setting. EXIF is typically dropped. This is another lossy (or browser-defined) encode on top of the original JPEG — keep the JPG master.
When to use it
Web performance passes, replacing heavy JPG heroes, and building `<picture>` experiments when you still keep a JPEG fallback elsewhere.
When not to use it
Email clients or print RIPs that reject WebP, archival masters (keep original JPEG/PNG), and crushing quality so low that banding appears then blaming the format.
How it compares to related tools
PNG to WebP for graphics that started lossless. WebP to JPG for compatibility back to JPEG. JPG to PNG usually grows files instead of shrinking them.
Common mistakes
Replacing the only master with WebP, setting quality near 0.1, and assuming WebP is always smaller without comparing the actual bytes.
Quality tradeoffs
WebP at similar perceptual quality is often smaller than JPEG, but not as a law — busy noise and already-optimized JPGs may shrink less. Always compare file size and zoom the subject. Default quality 0.92 favors fidelity; lower for bandwidth budgets.
Local Canvas processing
Encoding happens on your device. CaseSwitch never receives the photo. Prefer keeping the original JPEG beside the WebP in source control for future re-encodes.
Frequently asked questions
Is WebP always smaller than JPEG?+
Usually at similar quality, not as a law. Compare file sizes for your photo.
Does this strip EXIF?+
Canvas re-encode typically drops EXIF/GPS. That can be a privacy feature. Do not use this if you must keep camera metadata.
Is the image uploaded?+
No. Conversion is entirely in-browser.
Will another lossy pass hurt?+
Yes somewhat — you encode again from already-lossy JPEG pixels. Start from the best master you have.
Browser support?+
Current major browsers display WebP. Keep a JPEG fallback only for truly ancient targets.
Transparency?+
Source JPEG has no alpha, so output WebP will be opaque.
Are images uploaded to a server?+
No. Image tools use the Canvas API in your browser. Files stay on your device and object URLs are revoked after use.
Related tools
PNG to WebP Converter
Web performance for graphics, replacing heavy PNGs on marketing pages, and stickers that need a transparent background.
WebP to JPG Converter
Printers and CMS boxes that want JPEG, Outlook-era workflows, and sharing a photo with someone whose apps lack WebP.
JPG to PNG Converter
A CMS that rejects JPEG, a print tool that wants PNG, and pipelines that expect a PNG extension even when content started as a photo.
PNG to JPG Converter
Photos that were saved as PNG for no good reason, email attachments with size limits, and web photos that do not need transparency.
WebP to PNG Converter
Opening a WebP in an older editor, handing files to a print vendor that wants PNG, and keeping transparency for further design work.