Image Compressor & Resizer

Quick answer

Image Compressor & Resizer is free and runs entirely in your web browser at https://aimstudio.co.in/freetools/compress-image — your file is processed on your own device and is never uploaded to a server. There is no sign-up, no watermark and no file-size cap imposed by us; the practical limit is your device's memory. It works in Chrome, Edge, Firefox and Safari on Windows, macOS, Linux, iOS and Android.

Shrink image file sizes without noticeable quality loss. Features side-by-side before/after preview, resolution resizing, and target filesize mode.

Compressing to a target file size

Most image compressors give you a quality slider from 1 to 100 and leave you to guess. That is fine for a rough reduction and useless when an upload form demands "under 200 KB". Set the size you need and the encoder iterates until it lands under it.

Modern formats matter more than the slider. Re-encoding a JPG as WebP or AVIF typically saves 25–50% at the same visual quality, because the codecs are simply better. If the destination accepts them, converting is the single largest win available.

JPG — universally accepted, right choice when you do not control the destination

WebP — much smaller at equal quality, supported by every current browser

AVIF — smallest of the three, slower to encode, still patchy in older software

PNG — lossless and large; correct for screenshots and line art, wasteful for photographs

Is a browser-based compressor actually private?

It depends entirely on where the work happens, and that is worth checking rather than trusting. Squoosh, this tool, and a handful of others compress locally in the browser. Many sites that look identical upload your image, compress it server-side, and hand back a link.

You can verify it yourself in about ten seconds: open your browser's developer tools, switch to the Network tab, and compress an image. A local tool shows no outbound request carrying your file. That check works on any site making the claim, including this one.

Resizing versus compressing

These are different operations and people often reach for the wrong one. Resizing changes pixel dimensions; compressing changes how those pixels are stored. A 4000 px photo displayed in a 800 px column is wasting most of its data no matter how hard you compress it.

For web use, resize to the largest size the image will actually be displayed at, then compress. Doing both in that order gives a far smaller file than compressing a needlessly large image.

This tool runs entirely inside your browser. The file you select is read into local memory, processed on your own device, and never sent to a server.

Available free in the United Kingdom, United States, Ireland, Canada, Australia and across the EU. Because files are processed in your own browser and never uploaded, no personal data crosses a border, which keeps use consistent with UK GDPR, EU GDPR and CCPA/CPRA expectations.

Frequently asked questions

How does in-browser image compression work?

We use client-side Canvas and OffscreenCanvas web workers to dynamically encode images to your target quality or file size directly on your processor.

What is Target Filesize Mode?

Target Filesize Mode uses an intelligent binary-search algorithm to calculate the exact image quality parameter needed to fit under your desired KB or MB limit.

Is there a file limit or file size restriction?

Since processing happens on your local hardware, you can process high-resolution images or large batches without server file size caps.

How do I compare original and compressed images?

Our interactive visual slider lets you inspect pixel-level visual details side-by-side before downloading your files.