Compress
Compress by quality or target size, with a before/after comparison
Everything runs inside your browser
Compress, right in your browser: open it and start, with no sign-up, and your files never leave your device.
Guide and FAQ
What it does
- 60–75% usually halves the size with no visible difference.
- In KB. Quality is lowered first, then dimensions shrink if needed.
- Re-encoded with optimised compression; colors and transparency stay identical. An already well-compressed file is kept as is.
- Reduces the palette to the chosen size — close to the original to the eye, far smaller for photos.
How to use it
- Drop your images onto the page, or click to choose files.
- Adjust the settings you need; the result previews as you go.
- Export when it looks right, and the file saves straight to your device.
Frequently asked questions
Are my files uploaded to a server?
No. Everything in PicZero runs in your browser. Your images are never uploaded, and the server never touches your files.
Is it free? Are there any limits?
It is completely free, with no limits on the number of images, how often you use it, or file size. No account or sign-in is required.
Does it work on phones and computers?
Yes. It runs in modern browsers such as Chrome, Edge, Safari and Firefox, on phones, tablets and desktops.