Bild-Kompressor

So verwendest du Bild-Kompressor

1. 1Upload your image file or drag and drop it into the tool.
2. 2Adjust the tool-specific settings (quality, size, format, etc.).
3. 3Click the process button to apply changes.
4. 4Download the processed image.

Funktionen

• ✓100% kostenlos — keine Registrierung, kein Abo, keine Werbung
• ✓Läuft vollständig im Browser — Daten verlassen niemals dein Gerät
• ✓Schnell und ressourcenschonend — sofortige Ergebnisse
• ✓Plattformübergreifend — Desktop, Tablet und Smartphone

Was ist Bild-Kompressor?

Image compression reduces image file size while maintaining acceptable visual quality. Lossy compression (JPEG, WebP) discards data permanently; lossless compression (PNG) preserves all data. Modern web performance requires optimized images — uncompressed images are the #1 cause of slow page loads.

Wie funktioniert Bild-Kompressor?

JPEG uses Discrete Cosine Transform (DCT) to discard high-frequency visual data. WebP uses VP8 intra-frame encoding with better compression. The browser's Canvas API decodes the image, re-encodes it at a chosen quality level (0-1), and outputs a compressed Blob. Higher quality = larger file; lower quality = artifacts.

Typische Anwendungsfälle

• ✓Web performance — reduce LCP (Largest Contentful Paint) time
• ✓E-commerce — faster product image loading increases conversions
• ✓Email attachments — fit images within size limits
• ✓Storage savings — reduce cloud storage costs for user uploads

JPEG vs WebP vs PNG

JPEG: lossy, best for photos, no transparency. WebP: lossy or lossless, smaller than JPEG, supports transparency, 97% browser support. PNG: lossless, supports transparency, larger files, best for graphics/screenshots. For web photos use WebP with JPEG fallback; for graphics use PNG or SVG.

Sicherheit & Datenschutz

This tool processes images entirely in your browser using the Canvas API — your images are NEVER uploaded to any server. This is critical for sensitive images (medical, legal, personal). Server-based compressors see your images; browser-based ones cannot.

Technische Details

JPEG: DCT-based, quality 1-100, no alpha channel, baseline/progressive. WebP: VP8-based, 25-35% smaller than JPEG at equivalent quality, supports alpha. PNG: DEFLATE compression, lossless, supports 8/16-bit per channel. Canvas API: toBlob() with quality parameter for JPEG/WebP. EXIF metadata is stripped during re-encoding.

Häufige Fragen

Verwandte Tools