How to Compress an Image Online to Reduce File Size
To compress an image, adjust its compression quality factor to remove redundant color and pixel data while leaving visual dimensions intact. For standard JPG and WebP photos, a quality setting between 70% and 85% significantly decreases file size with virtually no noticeable difference to the human eye.
Step-by-Step Instructions
Add your image file
Drop or browse for your JPG, PNG, or WebP image.
Adjust the quality slider
Set the target compression quality between 10% and 100%. A setting between 70% and 85% delivers an optimal balance of small file size and clear visual detail.
Tip: Settings below 50% may show minor compression artifacts on fine details.Compare sizes and download
Review the real-time before-and-after byte counts to confirm your storage savings, then save the compressed file.
Technical Capabilities & Specifications
Alternative Methods on Windows, Mac & Mobile
Preview App
Open your image in Preview, click File > Export, choose JPEG as the format, and drag the Quality slider to reduce file size.
Paint / Photos
Open the image in Paint or Photos, select Save As > JPEG, or use built-in email resizing presets.
ImageMagick / GIMP
Run "magick input.jpg -quality 80 output.jpg" in the terminal or use GIMP's Export as JPEG dialog.
Frequently Asked Questions
What quality setting is recommended for web and email?
A quality setting between 70% and 85% is ideal. It typically reduces file weight by 50% to 80% while retaining clean visual fidelity on high-resolution displays.
Does compression change image width and height?
No. Compression reduces the file size in kilobytes or megabytes by optimizing pixel data, leaving physical dimensions (width and height) unchanged.
Why didn't my PNG file shrink as much as a JPG?
PNG is a lossless image format that retains exact pixel values. For photographs, converting the PNG to JPG will yield dramatically greater compression.
Is image compression secure on AllMorph?
This tool processes the file in your browser using the site's client-side engine. Your pictures never leave your device.