Image Compressor — Tips & Guide

Compress JPEG and PNG images entirely in your browser — no uploads, no servers. Reduce file size for faster websites, smaller email attachments, and quicker social media uploads.

70–85% Quality is the Sweet Spot

At 70–85% JPEG quality, file sizes drop 60–80% with virtually no visible difference to the human eye. Go lower only for thumbnails or previews.

Compress Before Uploading to WordPress

WordPress serves your original uploaded image, which can be very large. Compress to under 200KB before uploading for faster page loads and better Core Web Vitals scores.

Use JPEG for Photos

JPEG compression works best for photographs with many colors and gradients. PNG is better for logos, screenshots, and images with transparency or sharp edges.

Aim for Under 100KB for Web

Web images should ideally be under 100KB. Hero images can go up to 200–300KB if they span the full viewport width. Product thumbnails should be under 50KB.

No Quality Loss for Simple Graphics

For logos and flat-color graphics, try PNG compression at 80%+ quality — you'll often achieve 40–60% file size reduction with zero visible quality difference.

Check the Before/After Preview

Always compare the before and after previews before downloading. If you see JPEG artifacts (blocky edges), increase the quality slider by 5–10 points.

Image compression reduces the file size of an image by removing redundant or less important data. Lossy compression (used for JPEG) permanently discards some image data to achieve smaller sizes. Lossless compression (used for PNG) reduces file size without losing any data. This tool uses lossy canvas-based compression, which is ideal for photographs and general web images.

Lossy compression does reduce quality, but at 70–85% quality the difference is imperceptible to most viewers. The quality loss only becomes visible at very low settings (below 50%) where JPEG artifacts appear as blocky distortions in areas of high contrast. Use the before/after preview to find the lowest quality setting that still looks acceptable for your use case.

This tool supports JPEG and PNG formats for both input and output. JPEG is the most common format for photographs and produces the smallest files. PNG supports transparency and is best for logos, icons, and screenshots. Note that PNG to PNG compression may yield smaller file size improvements than JPEG compression, as PNG uses a different compression algorithm.

JPEG photos can typically be compressed to 20–30% of their original size with minimal visible quality loss at 75–80% quality. A 3MB smartphone photo can often be reduced to under 300KB. PNG files with complex photography can be reduced by 30–50%. The actual reduction depends on image content — simple images with large areas of solid color compress more than complex photos.