Image Compressor
Image Compressor reduces a JPG or PNG image's file size by re-encoding it at a lower quality, with a live before/after size comparison, entirely in your browser.
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How to compress an image
- 1 Click the upload box and choose a JPG or PNG image.
- 2 Drag the quality slider — the file size estimate updates live.
- 3 Click "Download" to save the compressed image.
Frequently Asked Questions
- Does this upload my image anywhere?
- No. Compression happens entirely in your browser using the canvas API — your image is never uploaded.
- Will compressing reduce image quality?
- Yes, to some degree — that's how file size is reduced. Use the live preview and quality slider to find a balance between size and visual quality.
- PNG vs JPG — which compresses smaller?
- JPG generally compresses much smaller than PNG for photos, since PNG is lossless. For images with transparency, PNG is required regardless of size.