Compression that happens on your own machine
Your photo is drawn onto a canvas inside your browser and re-encoded there. It is never uploaded to a server, so private documents, ID scans and client work stay on your device. That also means there is no file size cap imposed by an upload limit.
Picking a quality level
- 80 to 90% for portfolio images and product photos
- 60 to 75% for blog posts and social media, usually the best balance
- 40 to 55% for email attachments and form uploads with a strict size limit
Resize before you compress
A 4000 pixel wide photo displayed in a 900 pixel column wastes most of its data. Setting a maximum width usually saves more than any quality slider can, and it is the single biggest win for page speed, which feeds directly into Core Web Vitals and search rankings.
Frequently asked questions
Are my images uploaded to a server?
No. Everything runs locally in your browser, which is why it works even with a slow connection.
Why is the output always a JPG?
JPG gives the best size reduction for photographs. Keep the original if you need PNG transparency.
Is there a file size limit?
Only your device's memory. Very large images may take a few seconds on an older phone.