Image Compressor
Compress images locally — never uploaded.
Drop an image here
PNG, JPG, WebP or GIF · stays on your device
About Image Compressor
Local image compressor.
Images are usually the heaviest thing on a web page — a single uncompressed product photo can be larger than the rest of the HTML, CSS, JS combined. This compressor takes PNG, JPG, and WebP files, lets you tune the quality, shows a side-by-side preview, and produces a smaller file. Everything runs in your browser — your images are never uploaded.
Lossy vs lossless, and why it matters
JPG and WebP (lossy mode) discard imperceptible data to shrink files — quality 80 typically halves file size with no visible difference. PNG is lossless; the only way to shrink it is to reduce the color palette or use a more efficient encoder. For photos, JPG or WebP at quality 75–85 is the sweet spot. For screenshots, UI mocks, or anything with crisp edges and flat color, PNG or WebP lossless. AVIF beats both formats at the same quality but takes longer to encode — worth it for static assets, overkill for one-off compressions.
Frequently asked questions
Quick answers to the questions people actually ask about Image Compressor.
Are my images uploaded anywhere?
Are my images uploaded anywhere?
No. Compression runs in your browser via the Canvas API. Files don't leave your device. Open DevTools, watch the Network tab while you compress — zero outbound requests.
PNG, JPG, or WebP — which should I pick?
PNG, JPG, or WebP — which should I pick?
Photos: JPG at quality 80–85, or WebP at quality 75–80 (typically 25–35% smaller than JPG at equivalent quality). Screenshots, UI mockups, anything with crisp edges and flat color: PNG or WebP lossless. AVIF is better than both for static assets but takes longer to encode — overkill for one-off compressions.
Why is my compressed file barely smaller?
Why is my compressed file barely smaller?
Most likely the image was already compressed. Re-compressing a JPG at the same quality won't shrink it significantly. To meaningfully shrink, drop the quality (try 70 instead of 85), resize to the actual display dimensions, or convert to a more efficient format like WebP.