FileConvertTool

Compress Images Online — Reduce File Size Without Quality Loss

Reduce image file sizes dramatically by converting to more efficient formats. Upload PNG, JPG, WebP, or GIF images, choose a smaller output format, and download compressed files — completely free, no signup required.

When to Compress (and When Not To)

Compress when uploading to websites — page speed affects Google rankings and user experience.

Compress for email attachments — most providers limit to 25 MB.

Compress for social media — platforms re-compress anyway, so starting optimised gives better results.

Do NOT compress when editing — always edit in lossless format and compress as the final step.

Do NOT compress archival images — keep a lossless master copy alongside compressed versions.

Compression Results by Format

ConversionMethodTypical ResultQuality
PNG → WebP (lossless)Format conversion~26% smallerIdentical
PNG → WebP (lossy)Format + lossy~90% smallerVirtually identical
PNG → JPG (q85)Format + lossy~80% smallerImperceptible for photos
JPG → WebPFormat conversion~30% smallerNo visible difference
GIF → WebPFormat conversion~40% smallerBetter quality animation

Frequently Asked Questions

How much can I compress without losing quality?

With lossless compression, PNG to WebP reduces by 26% with zero quality loss. With lossy at quality 80-85, you get 70-90% reduction with invisible differences.

What format has the smallest file size?

AVIF produces the smallest files, followed by WebP, then JPG. For web use, WebP is recommended.

Does compression affect quality?

Lossless compression preserves quality perfectly. Lossy at 80-85% quality is typically imperceptible on screens.

Can I compress images for free?

Yes. Upload your image, select a more efficient format, and download — no signup, no watermarks.

How do I compress for a website?

Convert to WebP — supported by all modern browsers, 25-35% smaller than JPG and PNG.

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