Free Image Compressor
Drag and drop up to 50 images. Adjust quality, pick an output format, set a max dimension — and compress everything at once. Your files stay in your browser, always.
Compression Settings
Auto keeps PNG as PNG, converts everything else to JPEG.
Scales down if wider or taller than this. Leave blank to keep original size.
Drop images here or click to browse
JPEG, PNG, WebP, AVIF, GIF · Up to 50 images
Tips for best results
- JPEG photos: 70–80% quality is usually indistinguishable from 100% at ⅓ the file size.
- WebP is 25–35% smaller than JPEG at equal quality — use it for web images if you can.
- PNG logos/icons: keep as PNG to preserve transparency; use Max Dimension to cut size.
- Social media: set Max Dimension to 1200–1920px to avoid over-large uploads.
How to Compress Images
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1. Upload your images
Drag and drop up to 50 JPEG, PNG, or WebP images onto the drop zone, or click to browse.
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2. Set quality and format
Use the quality slider to balance file size vs. quality. Choose output format (auto, JPEG, WebP, or PNG) and optionally cap the maximum dimension.
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3. Compress instantly
All compression runs in your browser using the Canvas API — no upload to any server. See live savings percentages for each file.
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4. Download results
Download individual compressed images or click Download All to get a ZIP file of every compressed image.
Why Compress Images?
Faster Page Loads
Images account for 60–80% of a typical webpage's weight. Compressing them is the single biggest lever for improving load speed and Core Web Vitals.
Better SEO
Google uses page speed as a ranking factor. Smaller images mean faster LCP (Largest Contentful Paint) — a direct SEO signal.
Save Storage & Bandwidth
Compressed images use less disk space, less CDN bandwidth, and load faster on mobile networks — saving real costs at scale.
Frequently Asked Questions
How much can I reduce my image file sizes?⌄
It depends on the source image and quality setting. JPEG photos at 75% quality typically reduce by 50–70%. Converting PNG photos to WebP at 80% can reduce by 70–85%. Screenshots and graphics with flat colours compress less. The tool shows exact savings for each file.
What is the best format to compress to?⌄
WebP offers the best compression for photos and is supported by all modern browsers — use it when you can. JPEG is the widest-compatible format for photos and is ideal for older systems. PNG should only be used when you need lossless quality or transparency.
Will compression reduce my image quality noticeably?⌄
At quality settings of 75–85%, the difference is typically invisible to the human eye. Below 60%, artefacts become visible in photos — especially in smooth gradients and sky areas. Use the quality slider to find the best trade-off for your images.
Are my images uploaded to a server?⌄
No. Compression happens entirely in your browser using the OffscreenCanvas API. Your files never leave your device and are never sent to any server.
Can I compress PNG images while keeping transparency?⌄
Yes — choose PNG as the output format. PNG output is lossless and preserves the alpha channel. If you choose JPEG or WebP, transparency is flattened against a white background.
What does the max dimension setting do?⌄
The max dimension cap resizes any image so its longest side does not exceed the number you enter, before compressing. This is useful for reducing oversized images (e.g. 4000px photos) that are much larger than needed for web use.