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Compresseur d'image

Images are typically the largest assets on web pages, and unoptimized images are the #1 cause of slow load times. Our image compressor reduces JPG, PNG, WebP, and GIF file sizes using perceptually-optimized compression — retaining visual quality while achieving 50–85% smaller files, improving Google PageSpeed and Core Web Vitals scores.

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À propos de Image Compressor

Images are typically the largest assets on web pages, and unoptimized images are the #1 cause of slow load times. Our image compressor reduces JPG, PNG, WebP, and GIF file sizes using perceptually-optimized compression — retaining visual quality while achieving 50–85% smaller files, improving Google PageSpeed and Core Web Vitals scores.

Comment l'utiliser

  1. Upload one or more images.
  2. Set quality level (1–100 for JPEG; lossy/lossless for PNG).
  3. See before/after file sizes and visual quality comparison.
  4. Download compressed images individually or as a ZIP.

Formule et méthodologie

JPEG compression: discrete cosine transform (DCT) on 8×8 pixel blocks; quantization (the "lossy" step) discards high-frequency detail. Quality 80 = ~1/5 the size of quality 100 with barely perceptible difference. PNG: lossless DEFLATE (zlib) compression; optimization reduces filter choice overhead. WebP: ~30% smaller than JPEG at same perceptible quality (uses VP8 codec).

Cas d'usage courants

  • Web performance: Google PageSpeed requires images under 200KB for good scores
  • E-commerce: product image galleries with hundreds of images
  • Blog/CMS: compressing uploaded images before storage
  • Email: reducing inline image sizes in HTML email campaigns
  • App development: reducing APK/IPA binary size by compressing bundled images

Questions fréquentes

WebP is the modern standard: ~30% smaller than JPEG at equivalent quality, supports both lossy and lossless modes, and handles transparency (unlike JPEG). Browser support is now 97%+ globally. AVIF is even newer (~50% smaller than JPEG) but has ~88% browser support. For maximum compatibility, serve WebP with a JPEG fallback using the HTML <picture> element. PNG remains best for screenshots, diagrams, and images with transparency that must be lossless.
For web: 75–85 is the standard range. Quality 80 produces files ~80% smaller than quality 100 with imperceptible quality loss to most viewers. Quality below 60 introduces visible blocking artifacts. Quality 90+ is appropriate for product photos where customers zoom in. The diminishing returns above 85 are not worth the file size increase for typical web use. Google's recommendation for web images: quality 85 for JPEG.

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