Image Tools
Image Resizer
Change image width and height in pixels with aspect-ratio locking, percentage scaling and ready-made web presets.
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Local browser processing
Free Image Compressor Online
Compress JPG, PNG and WebP images online for free. Reduce image file size while maintaining good image quality directly in your browser.
Drop your JPG, PNG or WebP image here to compress
Supports JPG, PNG and WebP • Processed 100% locally in your browser
Select Image File
Your image is processed directly in your browser and is not uploaded to our server.
Original file size
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Compressed file size
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Percentage reduction
0%
Compression Settings
78% Quality
78%
Smallest file (5%)Balanced (78%)Max quality (100%)
Quick presets
Original image
Compressed preview
Privacy guarantee: your image is processed directly in your browser and is not uploaded to our server.
How to Use the Image Compressor
Follow these three steps to process your assets directly in the browser.
1
Upload or drop your image
Drag a JPG, PNG or WebP file into the upload zone, click to browse, or load the built-in sample photograph.
2
Adjust compression quality
Move the quality slider between 5% and 100%. The compressed size and percentage saved update instantly.
3
Compare and download
Check the side-by-side preview, then click Download to save your optimized file with no watermark.
Key Features of the Image Compressor
100% browser processing
Compression runs on the HTML5 Canvas inside your browser. Your images never reach our server.
JPG, PNG and WebP support
Optimize photographs, transparent graphics and modern WebP assets with one tool.
Live byte-savings meter
See original size, compressed size and exact percentage reduction before you download.
Optional format switching
Keep the original format or re-encode to WebP for an extra 25-35% saving.
How the image compressor works and best practices for modern web projects.
What is an image compressor?
An image compressor is a utility that reduces the storage weight of a photograph or graphic, measured in kilobytes or megabytes, without changing its pixel dimensions. Cameras and design apps such as Figma or Photoshop export files that carry redundant colour data and unused metadata.
This tool reads the pixel data with the browser Canvas API, redraws it at your chosen quality level and re-encodes it. For PNG files it additionally applies colour quantisation, which lowers the number of unique colours so the lossless PNG encoder can compress the image far more efficiently.
How to compress an image
Choose the quality level that matches where the image will be used:
- Hero banners and product photos: 75% to 85% quality. This usually removes 55-70% of the file weight with no visible difference on screen.
- Blog thumbnails and inline editorial images: 65% to 75% quality keeps subjects sharp while loading much faster.
- Transparent PNG icons and UI graphics: enable the PNG quantisation path or switch the output format to WebP for an immediate 60%+ reduction.
Benefits of compressing images
Images account for roughly 45% of the total weight of an average web page. Compressing them before you upload to WordPress, Shopify or a custom build directly improves Largest Contentful Paint, lowers hosting bandwidth and helps you pass the Google Core Web Vitals checks that influence search rankings.
Faster pages also reduce bounce rate on mobile connections, where a single unoptimized 3 MB hero image can delay the visible page by several seconds.
JPG vs PNG vs WebP
JPG uses lossy DCT compression and is ideal for photographs and smooth gradients, but it has no transparency channel. PNG is lossless and keeps full alpha transparency, which makes it the right choice for logos and screenshots, although unquantized PNG files stay heavy.
WebP combines both worlds: lossy or lossless compression plus an 8-bit alpha channel, typically producing files 25-35% smaller than an equivalent JPG and up to 70% smaller than an unoptimized PNG.
Image Compressor — Frequently Asked Questions
No. Compression only reduces the encoded file size in kilobytes. Width and height in pixels stay exactly the same. Use the Image Resizer if you also want smaller dimensions.
Never. The compressor runs entirely inside your browser using the Canvas and Blob APIs, so confidential client work and personal photos stay on your device.
For most websites 75% to 82% is the sweet spot: it removes around two thirds of the file weight while remaining visually identical at normal viewing distance.
Yes. The alpha channel is preserved. Colour quantisation only reduces redundant RGB precision, never the transparency mask.