Convert Image Online
Switch between JPG, PNG and WebP instantly — processed privately in your browser.
Converting…
How to image converter in 3 steps
- 1
Upload an image
Drop a JPG, PNG or WebP file into the box, or click to choose one.
- 2
Choose the output format
Select JPG, PNG or WebP. Adjust quality for lossy formats if you like.
- 3
Convert & download
The converted file is generated locally — click download to save it.
Why use Kotopig?
Your files stay private
Images are processed on your device and never uploaded to any server.
Instant results
No upload or download queue — processing starts the moment you drop a file.
Free, no sign-up
No account, no watermarks on output, no per-day limits. Just open and use.
Frequently asked questions
Are my images uploaded to a server?
No. Every operation runs entirely inside your browser using your device's own processor. Your files never leave your computer, so the tool works even with the page disconnected from the internet after loading.
What is WebP and should I use it?
WebP is a modern format that is typically 25–35% smaller than JPG or PNG at the same quality. It's great for websites; use JPG/PNG when you need maximum compatibility.
Can I convert PNG to JPG without a black background?
Yes. JPG can't store transparency, so Kotopig fills transparent areas with white (you'll see a clean background, never black).
Do I lose quality when converting?
Converting to PNG is lossless. Converting to JPG or WebP uses a quality setting you control, with a preview before download.