Free Image Compressor Online — Compress Images to Target Size
ToolifyZone Image Compressor shrinks image files to any custom KB target or quality percentage directly in browser memory without sending files to external servers.
Compress JPG, PNG, and WebP images online for free. Set a custom target file size in KB or fine-tune compression quality. All processing runs 100% locally in your browser memory for maximum privacy.
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Frequently Asked Questions
How does target-size image compression work?
Our engine uses a binary search algorithm directly inside your browser Canvas to test compression quality and proportional dimensions until the output meets your desired KB target.
What is the best way to reduce image size for websites?
Choose modern WebP format or balanced JPEG quality (70–80) to significantly decrease file weight and improve Core Web Vitals (Largest Contentful Paint).
Can I compress images while preserving visible quality?
Yes. By stripping invisible metadata and applying efficient lossy encoding, you reduce file size while keeping visible quality as high as possible.
Does this online image compressor keep transparency?
PNG and WebP outputs preserve transparency. Converting to JPEG automatically fills transparent backgrounds with clean white.
Are my images uploaded to any server?
No. All compression algorithms execute locally in your device RAM using HTML5 Canvas APIs. Your photos never leave your device.