What Is the Image Compressor?

Our online image compressor allows you to quickly optimize and shrink image file sizes directly within your web browser. This tool helps web designers, bloggers, and digital creators format files for web usage, improving site speeds, reducing bandwidth consumption, and saving local storage space. (If you're compressing images to combine them into a document, you can use our JPG to PDF tool afterward.)

All image processing uses the HTML5 Canvas APIs. Your security and privacy are our priority. We do not store your images in any database or share them with any third parties, ensuring 100% privacy and security for your personal or professional assets.

Expected Compression Results by Format

Here is the typical compression performance you can expect across different image formats using our tool at a 75% quality preset:

File Format	Original Size	Compressed Size	Size Reduction (%)	Quality Loss
JPEG (Photo)	4.8 MB	620 KB	87.1%	Imperceptible
PNG (Graphics)	2.1 MB	480 KB	77.1%	Imperceptible
WebP (Modern)	1.2 MB	290 KB	75.8%	Imperceptible
PNG (Screenshot)	850 KB	180 KB	78.8%	None (Lossless)

These benchmarks demonstrate how effectively you can optimize assets for fast website loading speeds.

In-Depth Technical Guide

Lossy vs Lossless Image Compression

When compressing images, there are two primary methods:

• Lossy Compression: Removes non-essential visual details that the human eye cannot easily detect. This results in massive file size savings (often 70-90%) with a minimal drop in visual quality. JPEG and WebP are classic lossy formats.
• Lossless Compression: Re-encodes the image data mathematically without discarding any pixels. File size savings are lower (typically 20-50%), but the image remains identical to the original. PNG is a classic lossless format.

Why Image Compression Matters for SEO

Google's Core Web Vitals use metrics like Largest Contentful Paint (LCP) to measure how fast a webpage renders its main content. Large, unoptimized images are the single biggest cause of slow LCP scores. By compressing your images:

1. Improves Page Load Speed: Smaller file sizes transfer faster over cellular networks and broadband.
2. Reduces Bounce Rate: Visitors are less likely to leave a page that loads instantly.
3. Lowers Hosting Costs: Less bandwidth is consumed on your server or CDN, saving costs.

How to Compress an Image (Step-by-Step)

Compressing an image with this tool takes two steps:

1. Upload your image. Click to upload, or drag and drop your PNG, JPG, or WebP file into the tool.
2. Download your compressed image. The tool applies compression automatically, and your optimized file is ready to download immediately, with the file size reduction shown alongside the result.

Choosing the Right Compression Quality for Your Use Case

The existing 70–80% guideline is a solid general default, but the ideal setting really depends on what the image is for:

• Website hero images and banners: Prioritize file size aggressively here, since these are typically the largest images on a page and have the biggest impact on load speed and Core Web Vitals. The 70–75% range usually gives an excellent balance, and most visitors won't notice the difference at typical screen viewing sizes.
• Product photography and detail shots: Lean slightly higher, toward 80–85%, since these images are often the ones visitors zoom into or examine closely before a purchase decision — a small file-size trade-off here is usually worth the extra visual fidelity.
• Screenshots and documentation: Favor lossless compression (as the reference table above shows with the PNG screenshot example) or a high-quality setting close to 90%+, since screenshots frequently contain small text and sharp UI edges where compression artifacts are most visually obvious and most likely to make text hard to read.
• Social media and email images: Match the platform's own display size rather than uploading a full-resolution original — a smaller starting resolution combined with moderate compression (70–75%) typically produces a smaller, faster-loading file than heavy compression alone on an oversized image.

As a general rule: the more visual detail matters to the viewer's experience (product close-ups, screenshots with text), the higher the quality setting should be; the more the image is simply supporting content around the page (banners, backgrounds, decorative graphics), the more aggressively you can compress without a noticeable trade-off.