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Image Compressor — Compress Images Online Free

Compress JPEG and PNG images directly in your browser. Adjust quality, see before/after file size, and download. Your image never leaves your device.

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Click to upload or drag and drop an image here

Supports JPEG, PNG, WebP — processed entirely in your browser

Compression Quality: 80% (lower = smaller file, lower quality)

Smaller Original 80%

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💡 Best for JPEG/WebP photos. PNG files with transparent backgrounds are exported as PNG; solid-colour PNG files are converted to JPEG for maximum compression.

How Image Compression Works

This image compressor uses the browser's built-in Canvas API to re-encode your image at a lower quality level. For JPEG images, reducing quality from 100% to 80% typically cuts file size by 50-70% with minimal visible difference. The quality slider controls the JPEG encoding quality — a setting of 80% is recommended for most photos as a balance between file size and visual quality.

JPEG vs PNG Compression

JPEG (also .jpg) is a lossy format — compression removes some image data permanently. It works best for photographs. PNG is lossless by default — it stores all image data exactly. PNG files with transparency are kept as PNG. Solid-colour PNG files are converted to JPEG in this compressor for maximum size reduction. If you need to preserve transparency, use a quality of 100% to minimise loss.

How Much Can You Compress an Image?

A typical smartphone photo (3-8MB) can be compressed to 300-800KB at 80% quality with minimal visible difference. Smaller images (social media posts, thumbnails) can compress from 500KB to 50-100KB. The exact savings depend on the image content — photos with lots of detail (landscapes, crowds) compress more than flat images with few colours. The before/after comparison above shows you exactly what you're getting.

Privacy — Your Images Stay in Your Browser

This tool runs entirely in your browser using JavaScript and the Canvas API. Your images are never uploaded to any server. No image data leaves your device. This is fundamentally different from most online image compressors that upload your photos to a third-party server. The processing happens locally, which also makes it faster for large files.

Frequently Asked Questions

Set quality to 80-90% in the slider above. At these settings, the compressed image is visually identical to the original for most photos while being 40-60% smaller. Below 70% you may start to notice artifacts in detailed areas.

80% is the recommended sweet spot — significant file size reduction with minimal visible quality loss. For social media: 75-80%. For email attachments: 70-80%. For web use: 75-85%.

No — the entire compression process runs in your browser. Your image never leaves your device. This tool uses the browser Canvas API to process images locally.

JPEG, PNG, and WebP. JPEG photos compress best. PNG files with transparency are kept as PNG. Solid PNG files are converted to JPEG for maximum compression.

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