Compression shrinks an image's file size by discarding data your eyes can barely tell apart from the original — the picture looks nearly identical but takes up a fraction of the space. Useful whenever you need to fit an upload limit, speed up a website, or free up storage.
For example: If you need to quickly shrink 20 vacation photos before emailing them — just drop them here: most mail providers cap attachments around 25 MB, and compression solves that in seconds.
Who uses it most: Web designers, content managers, social media specialists, photographers
At reasonable settings (70-85%) the loss is barely visible while file size drops 50-80%. The quality slider lets you balance size against detail for your specific use case.
The limit depends on your device's memory, not a server — everything runs locally in your browser. Files tens of megabytes in size process without issues.
Correct — compression runs entirely in your browser via JavaScript. The file never leaves your device; you can verify this yourself in your browser's dev tools Network tab.