How to use the Image Compressor

Click the upload box (or drag an image onto it). Choose an output format — JPEG for photos, WebP for the smallest size, PNG for lossless. Adjust the quality slider to balance size and visual quality. The compressed image appears with size comparison and a download button. Everything runs in your browser — your files never leave your device.

Pourquoi cet outil est important

Image weight is the single biggest factor in page speed for content-heavy sites. Uncompressed photos straight from a phone average 3-8 MB each. Smart compression to 200-400 KB looks identical to the human eye but makes pages load 10× faster on slow connections — improving Core Web Vitals, lowering bounce rate, and lifting SEO rankings.

Cas d'utilisation courants

• Compressing blog post header images before upload to WordPress
• Preparing product photos for e-commerce sites
• Shrinking screenshots for documentation and READMEs
• Reducing email-attachment images below provider limits
• Optimizing images for slow-connection users in emerging markets
• Batch-compressing photos before uploading to social media

When to use JPEG vs PNG vs WebP

JPEG: photos, gradients, anything continuous-tone. PNG: logos, screenshots, anything with sharp edges or transparency. WebP: best compression for both photo and graphic — ~30% smaller than JPEG at equivalent quality, ~25% smaller than PNG. Use WebP if your audience uses modern browsers (97%+ as of 2026) and your CDN/CMS supports it.

Foire aux questions

What is the right quality setting? 80-90 looks indistinguishable from original for most photos. 70-80 is the sweet spot for web (often 60-70% size reduction). Below 70 starts to show visible artifacts on solid color regions. Does the tool upload my image anywhere? No — everything runs in your browser using the Canvas API. Your image never leaves your device. Safe for confidential photos, internal screenshots, and customer data. Why is my PNG bigger than the JPG? PNG is lossless — it preserves every pixel exactly. JPG discards some data the human eye barely notices. For photos, JPG is always smaller. For text/logos/screenshots, PNG often wins because JPG\u2019s artifacts on sharp edges look worse. How small can I go without visible quality loss? For photos at typical web sizes (1200-2000px wide), 70-80% quality JPEG or WebP usually achieves 70-85% file size reduction without visible artifacts. Test at the size your audience will actually view.