Image Compressor
Compress JPEG images in browser without uploading
How to use Image Compressor
Compress JPEG images directly in your browser without uploading to any server. Adjust quality. Free online image compressor.
Why compress images for the web?
Images are typically the largest files on a webpage — often accounting for 60-80% of total page weight. Unoptimized images are the single biggest avoidable cause of slow websites. Compressing images before uploading is one of the highest-impact performance optimizations available.
- Website performance: A 3MB hero image downloads in 6 seconds on a 4Mbps mobile connection. Compressed to 300KB, it takes 0.6 seconds. This directly affects Core Web Vitals (LCP — Largest Contentful Paint) which Google uses as a ranking factor.
- E-commerce product images: Product pages with dozens of images multiply the performance impact. Compressing each product photo from 2MB to 200KB on a 50-product page saves 90MB of bandwidth per page load.
- Email newsletters: Many email clients have image size limits and display images inline. Compressed images load faster and reduce the chance of being flagged by spam filters for large attachments.
- Social media uploads: Platforms (Instagram, Facebook, Twitter) re-compress uploaded images with their own algorithms — often degrading quality. Uploading already-compressed, appropriately-sized images gives more control over the final appearance.
- Storage costs: Cloud storage (AWS S3, Google Cloud Storage) charges per GB stored and transferred. Systematic image compression reduces storage costs proportionally.
Privacy: This tool compresses images entirely in your browser using the Canvas API — no image is uploaded to any server. Your photos never leave your device.
Frequently Asked Questions
What is the difference between lossy and lossless compression?
Lossy compression (JPEG, WebP lossy) discards image data to reduce file size — the original cannot be perfectly reconstructed. Higher compression = smaller file but more visible artifacts. Lossless compression (PNG, WebP lossless, GIF) reduces file size without discarding data — perfect reconstruction is possible. Use lossy for photos (the eye tolerates JPEG artifacts in photos); lossless for graphics, logos, and screenshots with text.
What quality setting should I use?
For web use: 70-85% quality typically produces 60-80% size reduction with minimal visible quality loss. Below 60% shows visible artifacts (blockiness around edges and high-contrast areas). For printing: use 90%+ or lossless. For thumbnails where detail is less critical: 60-70% is acceptable. Always compare the compressed version visually before publishing.
What is the difference between JPEG, PNG, and WebP?
JPEG is best for photographs — lossy compression handles continuous tones well. PNG is best for graphics, logos, screenshots, and anything with text or sharp edges — lossless. WebP is a modern format supporting both lossy and lossless compression at smaller sizes than JPEG or PNG — supported by all modern browsers. SVG is for vector graphics that scale without quality loss. Use JPEG for photos, PNG for graphics, WebP for best modern web performance.
Should I resize images before or after compressing?
Resize first — do not upload a 4000×3000px image if it will display at 800×600px. Reducing dimensions reduces pixel count (and file size) more dramatically than quality compression. After resizing, compress the result. A 4000px image resized to 800px is 25x fewer pixels, then compression reduces it further.
Does this tool support PNG and WebP files?
This tool focuses on JPEG compression. For PNG optimization, tools like TinyPNG (browser-based), pngquant (command-line), or Squoosh (Google's browser-based tool) are more appropriate. Squoosh in particular supports JPEG, PNG, WebP, AVIF, and SVG in one browser-based tool.
Browser compressor vs Squoosh vs TinyPNG vs Photoshop vs CDN
This tool: private (client-side), instant, no upload — best for sensitive images or quick JPEG optimization. Squoosh (squoosh.app): Google's browser-based tool — supports all formats (JPEG, PNG, WebP, AVIF), side-by-side quality comparison, extremely powerful. TinyPNG/TinyJPG: API available, batch processing, Photoshop plugin — best for workflow integration. Photoshop Save for Web: most control, professional standard. CDN image optimization (Cloudflare, Imgix, Cloudinary): automatic compression and format selection based on browser and device — best for production websites at scale.