Convert between JPG, PNG and WebP
Different jobs need different formats: a form that only accepts JPG, a design tool that wants PNG, a website that loads fastest with WebP. This converter switches between the three formats instantly in your browser, shows the size change, and downloads the converted file. Converting to JPG uses a quality of 92 percent, high enough that photos show no visible difference.
A quick format guide
- JPG: best for photos, smallest compatible files, no transparency.
- PNG: lossless, supports transparency, best for graphics and anything you will edit again.
- WebP: modern all-rounder with the smallest files, ideal for web use.
File still too big afterwards? Run it through the Image Compressor.
How conversion works under the hood
Converting a format is not renaming a file. Your browser first decodes the original image into a grid of pixels held in memory, draws that grid onto a canvas at the exact same width and height, and then encodes the pixels again using the rules of the new format. That re-encode is where the differences appear. Encoding to JPG applies lossy compression and drops transparency, which is why this converter paints a white background behind see through areas first. Encoding to PNG stores every pixel exactly, so nothing is lost but files grow. Encoding to WebP uses a newer method that can work either way, keeping detail while storing it more efficiently. Because the pixels are rebuilt from scratch, metadata such as camera settings and location tags from the original file do not carry across into the converted copy.
Practical tips for cleaner conversions
- Convert from the best source you have: converting a small, heavily compressed JPG to PNG does not restore quality, it just makes a bigger file with the same flaws.
- Think about transparency before you start: if a logo has a transparent background and you convert it to JPG, the background becomes solid white. Keep a PNG or WebP master if you still need the transparency.
- Check the result size before sending: a PNG converted from a large photo can be several megabytes. If the destination has an upload limit, convert to JPG or WebP instead.
- Test where the file will be used: open the converted image in the actual app, form or website that needs it, not just in your photo viewer.
- Rename clearly: add the new format or purpose to the file name, such as logo-web.webp, so versions do not get mixed up later.
A worked example
Imagine a designer sends you a product logo as a 2400 by 2400 PNG with a transparent background, weighing 1.9 MB. Your online shop accepts the PNG as is for the product page, so you keep it untouched. For a marketplace listing that only accepts JPG, you convert a copy here. The result is about 320 KB on a white background, which suits the marketplace layout perfectly. For your own website header, where the logo sits on a colored band, you convert another copy to WebP at roughly 90 KB, and the transparency survives, so the band color shows through cleanly. One master file, three conversions, each matched to where it will appear.
Common mistakes to avoid
- Just renaming the extension: changing photo.png to photo.jpg by renaming does not convert anything. The file contents stay PNG, and many apps will refuse to open it.
- Converting back and forth repeatedly: every trip through JPG loses a little more detail. Always convert from the original master, not from a previous conversion.
- Expecting PNG to fix a blurry JPG: conversion cannot invent detail that was never saved. If the source is soft, every format made from it will be soft.
- Forgetting about background color: transparent areas turn white in JPG. If your design needs a dark background, convert to PNG or WebP, or place the JPG on a matching backdrop.
- Sending WebP to software that cannot read it: a few older desktop programs and print shops still struggle with WebP. Send JPG when you are unsure what the other side uses.
If dimensions are the problem rather than format, the Image Resizer changes pixel size while keeping the format you already have.