How should I choose quality?

Lower quality reduces file size more aggressively, but visible image loss becomes more likely.

Is the original uploaded anywhere?

No. Processing stays local in the browser.

Which output formats are supported?

JPEG, WebP, PNG, and AVIF are supported.

What does maxWidth do?

Images wider than that value are scaled down proportionally, which often reduces file size significantly.

What happens to transparency?

It depends on the output format. JPEG does not keep transparency, so it is worth checking the result when the source has an alpha channel.

Image Compressor Browser Tool

Try This Tool

Choose an image, run the tool, and review the result instantly.

Quality (0~1)Lower values create smaller files but reduce image quality.Max WidthImages wider than this value are scaled down proportionally.FormatOutput image format to use after compression.RotateRotate image clockwise.Flip XFlip image horizontally.Flip YFlip image vertically.

Image File

Output

Description

Overview

This page explains what the tool does, when to use it, and how to test it quickly with a built-in sample.

Reduce image file size by changing quality and output settings.

Image Input

This tool processes a local image file in the browser. Upload a test image to verify the flow.

Use this tool when you want to balance image quality against file size quickly. It fits common workflows such as web upload, document attachment, and chat sharing where page speed or size limits matter.

Compression happens entirely in the browser, so the original image is not uploaded to a server.

When to use it

When you want to reduce image KB for page performance
When you need to fit within messenger or email attachment limits
When you want to compare multiple quality and format combinations quickly

Tips for choosing quality and format

Compression is not only about one quality number. Format and dimensions matter too.

quality: lower values shrink files more, but visual loss increases
maxWidth: reducing oversized images often saves more than quality alone
format: JPEG is strong for photos, PNG for transparency, and WebP/AVIF for modern web delivery

Common mistakes

Lowering quality while keeping oversized dimensions unchanged
Converting transparent images to JPEG and being surprised by the background
Comparing outputs without checking them at the actual display size
Recompressing already compressed images over and over

Example input

File: banner.png
Options: quality=0.75, maxWidth=1600, format=image/jpeg

Example output

Compressed image-compressed.jpg file

FAQ

How should I choose quality?: Lower quality reduces file size more aggressively, but visible image loss becomes more likely.
Is the original uploaded anywhere?: No. Processing stays local in the browser.
Which output formats are supported?: JPEG, WebP, PNG, and AVIF are supported.
What does maxWidth do?: Images wider than that value are scaled down proportionally, which often reduces file size significantly.
What happens to transparency?: It depends on the output format. JPEG does not keep transparency, so it is worth checking the result when the source has an alpha channel.

Related Tools

Image Cropper

Crop an image to the exact area you need.

Image Format Converter

Convert images between JPG, PNG, and WebP.

Image Resizer

Resize image dimensions for web publishing and asset prep.

Explore More

This tool belongs to the Image Tools category. You can compare similar workflows from all tools on the tools hub .