Image Compressor Online – Compress JPG, PNG & WebP Without Losing Quality

What is an Image Compressor?

An image compressor is a tool that reduces the file size of an image by removing redundant or less-important image data. Smaller image files load faster on websites, consume less storage, use less bandwidth, and score higher on Google PageSpeed and Core Web Vitals — all of which directly improve your SEO ranking.

This free online image compressor runs entirely in your browser using the modern Canvas API. It supports JPG, PNG, and WebP formats, and lets you convert between formats to achieve even greater file size savings.

How to Compress Images Online – Step by Step

1. Upload images — drag & drop or click to browse. Select up to 20 JPG, PNG, or WebP files at once.
2. Choose a preset — pick Web Optimized, Social Media, Email Ready, High Quality, Max Compression, or Custom to set your own quality level.
3. Select output format — keep the original format or convert to JPEG, PNG, or WebP. WebP is recommended for the smallest file sizes on modern websites.
4. Click "Compress Images" — the tool processes all images locally in your browser and shows the before/after preview for each one.
5. Review the savings — see the original size, compressed size, percentage reduction, and total space saved across all images.
6. Download — download each image individually, or use the "Download All" button to save all compressed images at once.

Compression Presets Explained

Each preset is tuned for a specific use case. Here is what each one does:

JPEG vs PNG vs WebP – Which Format Should You Use?

Choosing the right output format is just as important as compression level. Here is how the three supported formats compare:

WebP delivers 25–35% smaller files than JPEG and up to 70% smaller than PNG at equivalent visual quality. All modern browsers — Chrome, Firefox, Edge, and Safari 14+ — fully support WebP.

Expected Compression Results by Format

Results vary by image content, but here are typical file size reductions you can expect:

• JPG → JPG (Web Optimized, 75%): Typically 50–70% size reduction with no visible quality loss at normal viewing sizes
• JPG → WebP: 25–40% smaller than JPEG output — the best option for websites
• PNG → PNG (lossless): 10–30% reduction — PNG cannot use lossy compression, so savings are modest
• PNG → WebP: Often 50–70% smaller — a massive saving for logos, screenshots, and UI images
• Real example: A 5 MB JPEG photo typically becomes 700 KB– 1.2 MB after Web Optimized compression — more than 75% reduction — with no visible difference at normal screen sizes

Image Size Recommendations by Platform

Different platforms have different image size requirements. Use these guidelines to choose the right compression preset:

When to Compress Images (and When Not To)

Always compress before:

• Uploading images to a website, blog, or CMS — page load speed affects SEO ranking
• Sharing images via email where attachment size limits apply
• Posting to social media — platforms re-compress your images anyway, so start with a compressed version for better results
• Delivering images in a mobile app where bandwidth and storage are limited
• Generating thumbnails or preview images

Do not compress when:

• Sending to a print shop — print requires full resolution (300 DPI or higher) with no lossy compression
• Delivering professional photography for client approval — share originals or lightly compressed high-quality versions
• Archiving original photos — always keep your originals uncompressed and only compress copies

How Image Compression Improves SEO and Core Web Vitals

Google's Core Web Vitals ranking signal directly measures page loading performance. Large, uncompressed images are the single biggest cause of poor Core Web Vitals scores. Here is how compressing your images helps:

• Largest Contentful Paint (LCP): Compressing your hero image from 3 MB to 200 KB can cut LCP time by 2–4 seconds — directly improving your Google ranking
• First Input Delay (FID) / INP: Smaller page weight reduces main thread blocking, improving interaction responsiveness
• Cumulative Layout Shift (CLS): Faster-loading images reduce layout shift caused by images loading and pushing content down
• Bandwidth savings: A page that loads in 1 second vs 4 seconds has a significantly lower bounce rate and higher conversion rate, especially on mobile

Frequently Asked Questions