Compress PNG Online

Reduce PNG file size for websites, app assets and design projects. LessMB compresses PNG images locally in your browser, keeping transparency intact and files private.

Files stay on your device
How it works

Compress PNG Online for private browser workflows

Compress PNG with transparency support

LessMB optimizes PNG files while preserving alpha transparency. This is useful for icons, logos and UI elements that require a transparent background.

Switch to modern formats for smaller files

WebP and AVIF often produce much smaller files than PNG at similar quality. If transparency is not required, JPEG may also give significant size savings.

No upload required

PNG processing happens entirely in your browser. Design assets, screenshots and private graphics never leave your device during compression.

Common use cases

Optimize icons, logos and UI graphics for faster page loads and smaller app bundles.

App and web assets

Reduce screenshot file sizes before embedding in documentation, emails or shared drives.

Screenshots

Compress design assets before sharing with developers or uploading to project management tools.

Design handoff

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Reduce JPEG file size for websites, email attachments, online stores and social media. LessMB compresses JPEG images locally in your browser, so your photos stay private.

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Reduce WebP file size for web publishing, CDN optimization and faster page loads. LessMB compresses WebP images locally in your browser with no server upload.

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FAQ

Compress PNG Online FAQ

Answers for the most common questions about this tool, supported workflows, and local browser processing.

No uploadFree toolBrowser-based
Can I compress PNG without losing transparency?

Yes. LessMB preserves PNG transparency during compression. For even smaller files, WebP also supports transparency.

Why is my PNG still large after compression?

PNG files with many colors or fine detail may not compress much further. Converting to WebP or AVIF can help in those cases.

Should I convert PNG to JPEG?

Only if you do not need transparency. JPEG is usually smaller for photos but does not support transparent backgrounds.