JPG Compressor – Reduce JPG File Size
Compress JPG and JPEG photos online for free without noticeable quality loss. Adjust lossy compression levels, resize large dimensions, and convert to WebP directly in your browser.
Upload JPG Photo
JPG, JPEGClick to select JPG or drag & drop
Supports standard JPEG camera photos & graphics
Compression Controls
No JPG loaded yet
Upload a JPG or JPEG photo to preview
How to Compress JPG Images Online
Upload Photo
Select or drag & drop any JPG/JPEG file from your phone or PC.
Adjust Quality
Set your desired compression slider (recommended 80%) or resize dimensions.
Instant Download
Click Download to get your lightweight, optimized JPG with zero server latency.
How JPG Lossy Compression Works
JPEG is the standard image format for photographs and real-world scenes. It utilizes a lossy Discrete Cosine Transform (DCT) quantization algorithm. By discarding subtle high-frequency color gradients that the human visual cortex cannot discern, JPG compression slashes file sizes by up to 85% while keeping faces, landscapes, and products sharp.
Frequently Asked Questions
Does JPG compression reduce photo resolution?
No. Changing the quality slider compresses pixel color data without altering pixel width and height. If you want to downscale dimensions, you can use the optional Max Dimension selector.
Why should I convert my JPG to WebP?
Google's WebP format utilizes predictive block encoding, delivering an extra 25% to 35% file size reduction compared to traditional JPEG at the exact same visual quality.
Are my photos uploaded to any external server?
Never. All processing happens 100% in your browser's HTML5 Canvas memory. Your files never touch external cloud servers.
What is the optimal JPG quality for websites?
80% quality is widely recognized by web performance engineers as the industry benchmark for hero banners and eCommerce product galleries.
Can I compress transparent PNG files here?
For transparent graphics, logos, and icons, use our dedicated PNG Compressor to preserve alpha channels.