Image Compressor

When you should compress an image

Large photos slow down websites, emails, and social uploads. A phone photo can be 3–8 MB even when the visible quality you need is far smaller. Compressing before you upload keeps pages fast and stays under platform size limits without opening a desktop editor.

Use this tool when you need a smaller JPEG for a blog, portfolio, marketplace listing, or messaging app. Pair it with our image resizer first if the dimensions are also too large — shrinking pixels usually saves more space than compression alone.

• Aim for high quality (85–92%) for hero images and portfolios
• Use mid quality (70–80%) for blog body images and thumbnails
• Re-check the preview after each change — stop when artifacts appear

How browser compression works here

Your file is drawn onto a canvas in the browser and re-encoded as JPEG at the quality you choose. Nothing is uploaded to StoryTweak. That keeps personal photos private and makes the tool work offline after the page loads.

JPEG is lossy: each save can remove detail. Start high and lower only until the file size fits your need. If you need transparency, keep a PNG master and export a JPEG copy for the web.

Tips for social and Snapchat-sized media

Portrait story formats (about 1080×1920) compress well at quality near 85%. Desktop banners (1920×1080) can often go a bit lower if the subject is not text-heavy. Avoid compressing screenshots of UI text too aggressively — edges go soft first.

For a deeper walkthrough, read our guide on compressing images without losing quality, then come back here to export the final file.