Compress Image Online

Reduce image file sizes by up to 90% directly in your browser — no upload, no server, completely private. Supports JPEG, PNG, WebP, AVIF.

Compress Images Free →Free · No signup · No upload

Large image files slow down your website, consume mobile data, and take longer to share. Compressing images online is one of the highest-impact optimisations you can make for web performance. Resizor's image compressor reduces file sizes by up to 90% using state-of-the-art codecs — all directly inside your browser, powered by WebAssembly. Your images are never uploaded to any server, so they remain completely private.

Resizor supports JPEG, PNG, WebP, and AVIF compression with a real-time quality preview so you can find the perfect balance between file size and visual quality. You can also convert between formats while compressing — for example, converting JPEG to WebP typically saves an additional 25–35% on top of standard JPEG compression. Batch upload multiple images to compress them all at once.

How It Works

Upload Your Image

Drop one or more images into the tool. JPEG, PNG, WebP, AVIF, and GIF are all supported.

Set Quality Level

Use the quality slider to control how much compression is applied. A preview lets you compare before and after.

Download Compressed Image

Download your optimised image — often 50–90% smaller with no visible quality difference.

Why Choose Resizor?

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Private — No Upload

Your images are never sent to any server. All compression happens in your browser via WebAssembly.

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Up to 90% Smaller

Smart lossy and lossless compression algorithms reduce file size dramatically while preserving visual quality.

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Batch Compression

Upload multiple images at once and compress them all in a single step.

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Always Free

No subscription, no watermarks, no daily limits. Compress as many images as you need.

Frequently Asked Questions

How do I compress an image without losing quality?

Use lossless compression or a very high quality setting (90%+) in a lossy compressor. For photos, JPEG at 80–85% quality is virtually indistinguishable from the original. For graphics with flat colours, PNG lossless compression or WebP is ideal.

What image formats can I compress with Resizor?

Resizor supports JPEG, PNG, WebP, AVIF, and GIF compression. You can also convert between these formats while compressing.

How much can I reduce an image file size?

Typical reductions are 40–80% for JPEG and 30–60% for PNG without visible quality loss. Converting JPEG or PNG to WebP can often achieve an additional 25–35% reduction.

Is Resizor better than TinyPNG?

Resizor runs entirely in your browser so your images never leave your device — unlike TinyPNG which uploads images to a server. Resizor also supports more formats and gives you fine-grained control over quality settings.

Can I compress images in bulk?

Yes. Resizor supports batch compression — simply select multiple files or drop them all at once and they'll be processed together.

Compress Image Online — Start Now

100% free, runs in your browser. No signup required.

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