100% Client-Side • Your Images Never Leave Your Device

Compress Images Online Free

Reduce JPG, PNG, and WebP image sizes up to 85% without noticeable loss in visual clarity. Fast, private, and 100% in-browser.

No server upload Batch Compression Max 50 MB per file Free Forever

Drop your images here or click to upload JPG, PNG, or WebP images

⚡ Fast In-Browser 🖼️ JPG, PNG, WebP 🔒 100% Private

Uploaded Images 0 Images

Compressing Your Images…

Downsampling & optimizing image buffers

Processing Image 1 of 1 0%

Compression Complete!

1 Image Compressed • Overall Savings: 65.4% (3.2 MB Saved)

Compression Level

Fine-Tune Quality 75%

Convert Output Format

Downscale image maximum dimensions

Filename Suffix

100% Client-Side • Zero Server Uploads

Why Choose OneTool

Everything You Need, Nothing You Don't

Lightning-fast, secure in-browser image optimization with zero server dependency.

Lightning Fast

Multi-threaded browser quantization optimizes JPG, PNG, and WebP images in split seconds.

Quality Control

Choose between Best, Balanced, and Smaller presets or fine-tune exact custom quality percentages.

Batch Compression

Upload dozens of images simultaneously and download all compressed files individually or as a single ZIP.

Before & After Preview

Inspect visual fidelity with side-by-side zoomed comparison before saving your optimized images.

Privacy Focused

Your photos never leave your device. 100% client-side HTML5 canvas processing ensures total security.

Works Everywhere

Fully responsive design works seamlessly across desktop, tablets, and smartphones.

More Image & Document Tools

Explore our full suite of free online browser tools.

Frequently Asked Questions

Everything you need to know about compressing images online.

How does online image compression work?

Image compression reduces redundant photographic data, optimizes 8-bit palette tables, and downsamples invisible color gradations to drastically decrease file weight without degrading visual clarity.

Will compressing PNG files lose transparency?

No. When you compress PNG images or choose "Keep Original Format", alpha transparency channels are fully preserved while file weight is reduced using UPNG lossless quantization.

What is the best format for minimal file size?

WebP offers superior modern compression (often 30% smaller than JPG). You can convert your images directly to WebP using our Advanced Settings.

Are my uploaded images secure?

100% private. All processing runs locally inside your browser using HTML5 Canvas and WebAssembly. Your photos are never transferred to any remote server.