Justools

Image Converter

Convert between JPG, PNG, and WebP so your photos match what a site or app expects.

Free tools that often go together. Everything runs in your browser.

How to use this tool

  1. Add one or more JPG, PNG, or WebP images.
  2. Pick output format: WebP, JPG, or PNG. Adjust quality for JPG and WebP if needed.
  3. Download one converted image or a ZIP when you added multiple files.

Frequently asked questions

What does the image converter do?

It changes an image from one file format to another, for example turning a PNG screenshot into a smaller WebP file for a website, or converting a WebP photo into JPG for an app that only accepts JPEG. Formats differ in compression, transparency support, and compatibility, so switching formats can solve upload errors, shrink file size, or match what a platform expects. Everything runs on your device using the browser's built in image handling, with no software to install.

Who uses an image converter?

Bloggers and shop owners preparing photos for a website, developers testing how an app handles different file types, and anyone who received a WebP image from a phone or website and needs a JPG or PNG that older software or a specific upload form can open.

Which formats are supported?

Upload JPG, PNG, or WebP. Choose WebP, JPG, or PNG as the output format before you convert.

When should I choose WebP, JPG, or PNG?

WebP is usually the smallest choice for web use at a given quality. JPG has the widest support for photos, useful for email and older software. PNG is lossless and best when you need sharp edges, text, or transparency.

Why a ZIP for multiple images?

Browsers handle one download at a time, so converting several images at once is bundled into a single ZIP instead of many separate downloads.

Are my images uploaded?

No. Conversion reads and writes files entirely in your browser. Your photos are not stored on a server.

Does converting lose quality?

Converting to a lossy format like JPG or WebP re-encodes the image and can introduce small quality changes, especially at low quality settings. Converting to PNG is lossless, so no further quality is lost, though file size may grow.

Is there a file size limit?

There's no hard cap, but very large images or long batches can slow the tab on older phones. If the browser feels sluggish, convert fewer files at a time or resize huge camera originals first.

Processed locally in your browser. Your files are never uploaded to our servers.