Image Compressor

Reduce image file size without visible quality loss — right in your browser. The Image Compressor below shrinks your JPG, PNG and WebP files in seconds, with an adjustable quality slider and a live side-by-side preview so you can compare results before downloading. No signup, no watermark.

How to compress an image

1. Step 1: Upload your JPG, PNG or WebP image.
2. Step 2: Adjust the quality slider.
3. Step 3: Download the compressed image.

What affects image size?

Three things mainly determine an image’s file size: its dimensions, its format, and the quality setting. Bigger dimensions mean more pixels to store, while JPG and WebP let you trade some quality for much smaller files with an adjustable slider. PNG is lossless, so it preserves every detail perfectly but usually produces larger files.

How Does Image Compression Work?

Image compression shrinks file size by removing data the eye won’t miss. Lossy compression (used for JPEG) discards subtle color detail — at moderate settings the difference is invisible, but push it too far and you get blocky artifacts. Lossless compression (used for PNG) reorganizes data without losing anything, but the savings are smaller.

Our image compressor lets you choose the balance: drag the quality slider and watch the file size update in real time. For photos, 70–80% quality typically cuts 60–80% of the file size with no visible change. For graphics with text, stay above 85% or switch to PNG.

JPEG vs PNG vs WebP: Which Compresses Best?

For photographs, JPEG (or WebP) wins — a 5MB phone photo often compresses to under 1MB. PNG is the wrong choice for photos; it’s designed for graphics, logos, and screenshots with sharp edges and flat colors, where it beats JPEG on both quality and size.

WebP is the modern sweet spot: 25–35% smaller than JPEG at the same quality, with transparency support like PNG. The catch is compatibility — some older software still expects JPEG. Our tool converts between all three, so compress first, then export in whatever format you need.

How Much Can You Compress an Image Without Losing Quality?

It depends on the image and its purpose. For web use, most photos survive 70–80% quality beautifully — that’s the range our tool defaults to. For printing, stay at 90%+ or use lossless. For thumbnails and previews, you can push to 50–60% and nobody will notice at small sizes.

A practical rule: compress to the smallest size where you can’t see a difference at 100% zoom. And always keep your original — compression is one-way, so download the compressed copy as a new file rather than overwriting.

FAQ

Is it free?
Yes — the Image Compressor is completely free to use, with no signup and no watermark.

Will compression ruin quality?
You control the quality slider, and the live side-by-side preview lets you compare the original and compressed versions before you download.

Which formats are supported?
JPG, PNG and WebP.

Is my data private?
Yes — everything happens in your browser. Your images never leave your device.

Need to switch formats instead? Try our image converter to move between JPG, PNG and WebP.