Image Compressor
Compress images without losing quality. Supports JPG, PNG and WebP.
Drag & drop an image here or click to upload
Accepted formats: JPG, PNG, WebP
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How it works
Your image is loaded into a hidden HTML5 canvas, then re-encoded with a quality parameter you control (1–100). Lower quality discards finer image data, producing a smaller file. JPEG and WebP support quality control; PNG is lossless so the size reduction comes from re-encoding overhead removal. Everything happens in your browser via canvas.toBlob — your image is never uploaded, which is essential for sensitive screenshots, ID photos, or unreleased work.
canvas.toBlob(blob => …, "image/jpeg", quality / 100)
// quality 80 ≈ 60–70% size reduction with no visible loss
Common use cases
- Compressing screenshots for email attachments under a 25MB Gmail limit.
- Reducing product photos for faster e-commerce site load times.
- Optimizing images for social media uploads without external tools.
Frequently asked questions
Will compression visibly degrade my image?
At quality 80–90, JPEG compression is visually lossless for photographs (you cannot tell the difference at normal zoom). Below 60 you start seeing blocky artifacts in detail-rich areas. Quality 80 is the recommended starting point.
Why is my PNG barely smaller?
PNG is a lossless format — the quality slider only affects re-encoding overhead, not pixel data. For real PNG size reduction, convert to JPEG (if no transparency) or WebP. WebP typically beats both at equal quality.
Is my image uploaded anywhere?
No. Compression runs entirely in your browser using the Canvas API. The image never leaves your device — even network monitoring tools will show zero outgoing data when you compress.
What about file types like HEIC or RAW?
Browsers natively support JPEG, PNG, WebP, GIF, and BMP. HEIC (iPhone) and RAW formats need to be converted first — either share as JPEG from your phone, or use a desktop tool like Preview or RawTherapee before compressing here.