Image Compressor
Compress JPG, PNG and WebP images in your browser. Adjustable quality, instant size comparison. No upload — 100% client-side.
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Unterstützt: .png, .jpg, .jpeg, .webp · Max: 100MB
📘 Anleitung
Anleitung auf Englisch verfügbar. Automatische Übersetzung folgt.
How to Compress Images Online
What This Tool Does
The Image Compressor reduces image file size by re-encoding at a lower quality setting and optionally converting to a more efficient format. Drop a 5MB photo, set quality to 75, and get a 500KB image that looks nearly identical on screen — all in your browser, with no upload and no server.
Why Image Compression Matters
Uncompressed images are the single largest contributor to slow web pages. A typical smartphone photo is 3-5MB; on a mobile connection, that takes several seconds to load. Compressing it to 300-500KB can cut load time by 80% with minimal visible quality loss. For websites, faster loads mean better SEO rankings, lower bounce rates, and higher conversion rates. For email, smaller images avoid attachment size limits and spam filtering.
How to Use
- Drop your image (PNG, JPG, or WebP) onto the upload zone.
- Set the quality slider: 75 is a good starting point for web use. Below 60, artifacts become visible. Above 90, file size reduction is minimal.
- Choose output format: "auto" keeps the original format. Switching to WebP often gives 25-35% additional savings at equivalent quality.
- Click Compress. The result shows original vs compressed size and the savings percentage.
- Download the compressed image.
Choosing the Right Quality
- 90-100: Near-lossless. Large files. Use for archival or when every detail matters.
- 75-85: Good web quality. Recommended for most website images. Artifacts are barely visible.
- 60-70: Acceptable for thumbnails and social media where small size matters more than fidelity.
- 30-50: Aggressive. Noticeable artifacts. Only suitable for previews or placeholders.
PNG vs JPG vs WebP
PNG is lossless but produces much larger files for photographic content. JPG is lossy but universally supported and excellent for photos. WebP provides the best compression for both lossy and lossless modes and is supported by all modern browsers. If your platform supports WebP, choose it; otherwise, JPG is the safe choice for photos and PNG for graphics with transparency.
Privacy
Compression is performed using the Canvas API entirely in your browser. Your images are never uploaded, logged, or stored on any server. Safe for personal photos, client assets, and confidential documents.
❓ Häufige Fragen
How much can I compress an image?
It depends on the original. A 5MB phone photo at quality 75 typically compresses to 300-800KB — a 80-90% reduction. Already-compressed images see smaller gains.
What quality should I use?
75 is a good default for web images. Below 60 you will see visible artifacts. Above 90 the file size savings are minimal for the quality gain.
Should I convert to WebP?
If your target platform supports WebP (all modern browsers do), it typically saves 25-35% over JPEG at equivalent quality. Use "auto" to keep the original format or explicitly select WebP.
Is my image uploaded to a server?
No. Compression uses the browser Canvas API. Your images never leave your device, making this safe for personal and confidential photos.