Are my images uploaded to a server?

No. All compression happens entirely in your browser using JavaScript. Your images never leave your device.

Which formats are supported?

JPG/JPEG, PNG, and WebP. PNG uses palette quantization (UPNG); JPG and WebP use Canvas quality settings.

What does quality 100% do?

For PNG: lossless mode, removes only redundant data. For JPG/WebP: maximum quality, minimal compression.

Why is the output sometimes larger than the input?

If compression makes a file larger (which can happen with already-optimized images), the tool keeps the original file size.

Can I compress an image to a specific size like 20KB or 100KB?

Not to an exact byte target, but lowering the quality slider reduces the output size. Drop quality in steps and watch the live size readout until you reach roughly 20KB, 50KB, or 100KB.

Image Compressor

Name: Image Compressor
Availability: InStock
Author: Nham Vu

Upload images, set a quality level, click Compress, then download the results individually or as a ZIP.

Compression Options

Click or drag images here

JPG, PNG, WEBP supported

Target Quality 80%

Recommended. Best sharpness for web use.

Queue (0)

No files added yet

Summary

Upload images, set a quality level, click Compress, then download the results individually or as a ZIP.

How it works

Click the upload zone or drag and drop image files.
Adjust the quality slider (80% is recommended for web use).
Click "Compress Images" to process the queue.
Download files individually or click "Download All" for a ZIP.

Use cases

Reduce image file sizes before uploading to a CMS or website.
Compress screenshots for sharing without quality loss.
Optimize product images for e-commerce platforms.
Reduce photo sizes before attaching to emails.

Frequently Asked Questions

Related tools

Img Webp Resize Jpg Png

Last updated: 2026-06-02 · Reviewed by Nham Vu