How much smaller will my image get?

It varies by image content and starting format — photos with a lot of fine detail compress less dramatically than simpler images, and a source image that's already compressed (like an existing JPG) has less room to shrink further than an uncompressed source like a PNG straight from a camera.

Can I compress many images at once with the same settings?

Yes, batch compression applies your chosen quality setting to every uploaded image at once, useful for shrinking a whole folder of photos before uploading them somewhere.

Will compression be visibly noticeable?

At light-to-medium compression, quality loss is usually hard to spot on screen. Higher compression trades more visible quality for a smaller file — the live preview lets you see the tradeoff before committing.

What's the difference between this and just re-saving as a lower-quality JPG?

This tool supports quality-adjustable compression across multiple formats (not just JPG), and lets you compare file size in real time as you adjust, rather than guessing and re-exporting repeatedly.

Does compressing an image change its dimensions?

No, compression reduces file size by changing how pixel data is encoded, not by resizing the image — width and height stay the same. Use Resize Image if you also want to shrink dimensions.

Which formats can be compressed?

JPG, PNG, and WEBP all support quality-adjustable compression here, covering the most common web and photo formats.

Is my image uploaded to a server?

No. Every operation runs locally in your browser using JavaScript and WebAssembly. Your image is never transmitted anywhere, which also means it works without an internet connection once the page has loaded.

Compress Image

Reduce image file size with adjustable quality, from lossless to maximum compression.

Processed entirely in your browser — your file is never uploaded anywhere.

Why compress images with Tools Root

Large image files slow down websites, eat into email attachment limits, and take up storage space unnecessarily — often without any visible quality benefit, since most images are viewed on screens far lower resolution than the source file. Compression closes that gap.

Quality-adjustable, with a live preview

Rather than a single fixed compression level, you choose exactly how much to trade file size for visual fidelity, watching the resulting size update as you adjust — useful for finding the smallest file that still looks good for your specific use.

Common use cases

Shrinking product photos before uploading to an online store, compressing a batch of photos to fit under an email attachment limit, reducing image weight to speed up a website's load time, or preparing images for a platform with a strict file size cap.

How to compress an image

1Upload one or more images (batch compression is supported).
2Choose a quality level, from near-lossless to maximum compression.
3Compare the before/after file size shown live as you adjust.
4Download the compressed image, or all of them as a ZIP.

Frequently asked questions

Related tools

Convert Image

Convert between PNG, JPG, WEBP, AVIF, BMP, TIFF, GIF, SVG, ICO, and HEIC.

Resize Image

Resize by exact dimensions or percentage, with an optional aspect-ratio lock.

Crop Image

Crop freely or to a preset aspect ratio using a visual selector.

Rotate & Flip Image

Rotate in 90-degree steps and flip horizontally or vertically.