What Is Image Compression?

Image compression reduces the file size of an image while keeping it looking as close to the original as possible. Smaller images load faster on websites, send faster over email and messaging apps, and take up less space on your device — while still looking great to the human eye.

How to Use This Tool

Upload one or more images — drag and drop or click to browse.
Pick a preset — or fine-tune the quality slider manually.
Choose an output format — keep the original, or convert to JPG/WEBP/PNG on the fly.
Click "Compress All" — see the before/after sizes per image.
Download — individually or all at once.

Compression Presets

Lossless-ish (~95%) — Barely noticeable compression. Perfect when quality is critical and you just want a modest reduction.
Recommended (~80%) — The sweet spot for most images. Great balance between size and quality. Most photos look identical to the original.
Aggressive (~60%) — Noticeable savings with slight quality loss. Good for blog images, thumbnails, and web galleries.
Extreme (~40%) — Maximum savings with visible compression artifacts. Use for icons, placeholders, or when bandwidth is critical.

Format Guide

Keep Original — preserves the source format (useful when the format already works for you).
JPG — best for photographs and complex images with many colors.
WEBP — modern format with the best compression ratio. Often 25–35% smaller than JPG at the same quality.
PNG — lossless format. Note: PNG doesn't benefit from quality sliders, so this only reduces size via pixel-data optimization.

How Much Can You Save?

Typical savings with the Recommended (80%) preset:

JPG photos — 40% to 65% smaller with no visible difference
PNG screenshots — 30% to 60% smaller when converted to WEBP
WEBP images — 20% to 40% smaller with mild quality reduction
Very high-resolution images — often 70%+ smaller while still looking sharp

Real savings depend heavily on the original image's encoding. An already-compressed JPG won't shrink as much as an uncompressed PNG or BMP.

Common Use Cases

Website optimization — compress hero images, thumbnails, and product photos before uploading.
Email attachments — keep images under the 25 MB Gmail limit easily.
Social media — pre-compress before uploading to save on data and speed uploads.
Blog posts — smaller images mean faster page loads and better SEO.
Cloud storage — compress large photo libraries before backing up.
Messaging apps — smaller files send and receive faster.

Lossy vs Lossless Compression

Lossy compression (JPG, WEBP with quality setting) — discards some pixel data permanently. Smaller files, slight quality loss. Adjustable via the quality slider.
Lossless compression (PNG) — preserves every pixel exactly. Larger files, but perfect quality. PNG's compression is fixed by the format.

For most photos and web use cases, lossy compression is the right choice — the tiny quality loss is invisible to the human eye, while the size savings are dramatic.

Privacy Note

All compression happens in your browser using the HTML5 Canvas API. Your images are never uploaded to a server, never stored, and never shared. Close the tab and everything is gone.

Image Compressor