Image Compressor
Reduce image file size without losing quality. Works entirely in your browser.
Drop your image here
or click to browse · JPEG, PNG, WebP supported
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How to compress images online for free
Our image compressor uses advanced browser-based algorithms to reduce the file size of your JPEG, PNG, and WebP images while preserving visual quality. Unlike most online tools, everything happens directly in your browser — your images are never uploaded to any server, ensuring complete privacy and instant results.
Simply drag and drop your image onto the upload area, adjust the quality slider to your preference, and download the compressed result. Most images can be reduced by 40–80% in file size with no visible difference in quality.
Why compress images?
Large image files slow down your website, increase mobile data usage, and hurt your Google search rankings. Google's Core Web Vitals score — which directly affects SEO — heavily penalizes pages that take more than 3 seconds to load. Compressing images is one of the fastest ways to improve page speed.
For e-commerce stores, blogs, and portfolios, optimized images can cut page load time in half. A page that loads in 1 second instead of 3 seconds can see conversion rates increase by up to 27% according to industry studies.
JPEG vs PNG vs WebP — which format compresses best?
JPEG is best for photographs and images with lots of colors. It uses lossy compression, meaning some data is discarded, but at quality settings of 70–85% the difference is invisible to the human eye. JPEG files are typically 5–10x smaller than PNG for photos.
PNG is best for logos, screenshots, and images with text or sharp edges. PNG uses lossless compression so no quality is lost, but file sizes are larger. Use PNG when you need a transparent background.
WebP is Google's modern image format that produces files 25–35% smaller than JPEG at the same quality. It supports both lossy and lossless compression, and transparency like PNG. All modern browsers support WebP.
How does browser-based image compression work?
Our tool uses the browser's built-in Canvas API to re-encode your image at a lower quality setting. When you set the quality to 80%, the Canvas API writes a new JPEG or WebP file that discards visual information the human eye cannot easily detect — such as minor color variations in smooth gradients.
For PNG files, which are lossless, the compression works by optimizing the internal data structure rather than reducing quality. This can still achieve 20–40% size reduction on many PNG files.
Frequently asked questions
Is my image uploaded to your servers?
No. All compression happens entirely inside your browser using JavaScript and the Canvas API. Your image never leaves your device and is never sent to any server.
What is the maximum file size I can compress?
There is no hard limit, but very large files (over 50MB) may be slow to process depending on your device. Most browser-based processing works best with files under 20MB.
Will I lose quality when compressing?
At quality settings of 75% and above, the difference is generally invisible to the human eye. You can always preview the result before downloading.
Can I compress PNG files without losing transparency?
Yes. Our tool preserves PNG transparency. For maximum compression of transparent images, we recommend also trying WebP format which supports transparency at smaller file sizes.
How much can I reduce my image file size?
Results vary by image type and content. Photographs typically compress 40–80%. Screenshots and graphics compress 20–50%. WebP format generally achieves the best compression ratios.
Tips for best compression results
- For photos and product images, use JPEG or WebP format at 75–85% quality
- For logos and icons with transparency, use PNG or WebP
- Resize your image to the actual display size before compressing — there is no point having a 4000px wide image displayed at 800px
- Use WebP format for web images whenever possible — it offers the best quality-to-size ratio
- For social media, most platforms re-compress your images anyway, so uploading slightly larger files is acceptable