Image Compressor
Compress images to reduce file size while maintaining quality. Supports JPG, PNG, and WebP.
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About Image Compression
Image compression reduces file size by removing data. Lossy compression (JPG, WebP, AVIF) discards visual information that's barely noticeable — at 80% quality, most photos look identical to the original but are 50–70% smaller. Lossless compression (PNG, WebP-lossless) keeps every pixel exact but achieves smaller savings (10–30%).
Why image compression matters in 2026
Images account for ~50% of the average webpage's bytes. Slow-loading images directly hurt Core Web Vitals (LCP — Largest Contentful Paint), which Google uses as a ranking signal. A 5 MB hero image can ruin a perfect Lighthouse score. Compression is one of the highest-leverage performance improvements available — typical 3 MB photo → 600 KB at 80% quality, visually indistinguishable.
Quality settings — when to use what
- 95–100%: archival, professional photography, source files
- 85–90%: portfolio, hero images, marketing material
- 75–85%: blog posts, product photos, general web — the sweet spot
- 60–75%: thumbnails, gallery previews, social media uploads (where you trust the platform's compression)
- Below 60%: visible artifacts in skies, gradients, faces — only for tiny placeholders
How to Use
- Set the compression level with the quality slider (80% recommended).
- Drag and drop images, or click to browse.
- Click Compress to start — batch processing supported.
- The result panel shows before/after sizes and percent savings per file.
- Click Download per file or Download All for batches.
Privacy: All compression runs in your browser via the Canvas API. Nothing is uploaded.
Format-specific notes
- JPG → JPG: re-encoded with new quality. Repeated lossy compression degrades quality (generation loss) — compress once from highest-quality source.
- PNG → WebP: WebP achieves 25–35% smaller files than PNG with no visible quality loss. Universal browser support since 2020.
- HEIC/HEIF: convert to JPG/WebP first (iPhone format, not universal)
- AVIF: the smallest format (50%+ smaller than JPG) but limited tooling support — use for hero images on sites where you control the asset pipeline
FAQ
Will compression ruin my image quality?
At 80–90% quality, the difference is essentially invisible to the human eye for most photos. Below 50%, you'll see artifacts (blocky textures, color banding in gradients, mosquito noise around edges). Use the slider to find the threshold for your specific image — photos with smooth gradients (skies, faces) are more sensitive than busy textures.
What format is the output?
JPG files stay as JPG. PNG and WebP files are output as WebP for better compression. To force a specific format, use the corresponding converter tool.
Why is my JPG already small but PNG huge?
JPG uses lossy compression optimized for photographs. PNG uses lossless compression optimized for graphics with hard edges (icons, logos, screenshots). A 4K screenshot can be 10 MB as PNG but 800 KB as JPG. Choose format by content type: photos = JPG/WebP, graphics = PNG/WebP-lossless.
Should I compress before or after resizing?
Resize first, compress second. Resizing produces a smaller image with the same quality; compressing afterward applies a single lossy step instead of two. Compressing then resizing causes double quality loss.
Why doesn't WebP compression always reduce my file?
If the input is already a heavily-compressed JPG, WebP may produce a similar or slightly larger file (since the source quality is already gone). WebP's advantage is most visible when starting from PNG or high-quality sources.
Is there a maximum number of files?
No hard limit — works in batches of up to ~100 images smoothly. For thousands of images, consider command-line tools like ImageMagick or Sharp (Node.js).
⚠️ Reference Only
Output is generated based on your input and is provided for reference. Results may vary depending on your specific use case, edge cases, or environment-specific behavior. We do not guarantee accuracy of conversions, validations, or computed values.
Always verify critical outputs against official documentation or production environments. We are not responsible for any decisions or losses based on these tool results.