JPG to WebP Converter

Why sites move from JPG to WebP

Images are usually the heaviest thing on a web page — often more bytes than the code, fonts and stylesheets combined. Switching photos from JPG to WebP typically removes a quarter to a third of that weight without any change you would notice looking at the page.

That shows up in Largest Contentful Paint, the Core Web Vitals metric that measures how long the main image takes to appear. It is the metric most sites fail, and images are almost always the reason.

Where the savings come from

JPG was designed in the early 1990s. WebP arrived twenty years later and inherited compression techniques developed for video — it predicts blocks of an image from their neighbours rather than encoding each one independently. On a photograph with large areas of similar colour, sky or skin or blurred background, that prediction is very accurate and the file shrinks accordingly.

Busy images gain less. A photo of dense foliage or a crowd gives the encoder little to predict, so expect closer to 15% than 35%.

Pick your quality carefully here

A JPG has already been compressed once. Converting it re-encodes an image that has lost detail, so the losses stack. At 85% or above this is invisible in practice. Below about 60% you start to see the original JPG’s own artefacts getting smeared and amplified, which looks worse than either format would alone.

If you still have the original camera files, converting those directly gives a cleaner result than converting an already-exported JPG.

When to stay with JPG

• The photo is going to a print shop, a client, or an email attachment — JPG opens everywhere with no thought required.
• An upload form specifically asks for JPG. Some still reject anything else.
• The image will be edited again in older desktop software that cannot open WebP.

Frequently asked questions

Will Google penalise WebP images?

The opposite. Google developed WebP and its own page speed tools actively recommend serving images in modern formats.

Should I delete the JPG originals?

Keep them. Conversion is lossy in one direction only — you can always make another WebP from a JPG, but you cannot recover the JPG’s quality from the WebP.

How many photos can I do at once?

Up to 20 per batch. Use Download ZIP to save them all in one file.

Are my photos uploaded?

No. Conversion runs in your browser and nothing is sent anywhere.

Need a different pair of formats? The image converter handles JPG, PNG, WebP, HEIC and SVG in any direction.

Related image tools

• Image Converter — mix formats in one batch, or pick any output you need.
• PNG to WebP — the other common conversion for web images.
• HEIC to JPG — for photos taken on an iPhone.
• Image Compressor — reduce file size to a target you set.