JPG Compressor
Compress JPEG photos by adjusting quality. Fast and private, no upload needed.
📷
Drop JPEG files here or
JPEG files only. Files never leave your browser.
JPG Compressor is a browser-based tool that reduces the file size of JPEG images by lowering the quality level. It targets photos and other JPEG content where lossy compression is expected and generally invisible at moderate settings. All processing happens locally in your browser — your images never leave your device.
Tool interface
The interface is minimal and efficient:
- A drag-and-drop upload area for one or multiple JPEG files
- A quality slider (1–100%) to control compression strength
- A file list showing each filename and original size
- Live size comparison after compression (original → compressed, savings %)
- A
Compress & Downloadbutton to process and save all files - A
Clearoption to reset and start over
For multiple files, the output is packaged into a single ZIP archive.
Tool description
JPG Compressor uses the browser's Canvas API to re-encode JPEG images at the quality level you choose. JPEG is an inherently lossy format — every time a JPEG file is saved, some image data is discarded in exchange for a smaller file. This tool lets you control exactly how much data is discarded.
Lower quality settings produce smaller files but introduce more visible compression artifacts, especially in smooth gradients and fine details. Higher quality settings preserve more detail at a larger file size. For most photos, a quality setting between 70–85% strikes a good balance.
If the compressed file ends up larger than the original (which can happen with already-compressed files), the tool returns the original unchanged and shows an "already optimized" notice.
Some practical use cases:
- Compressing camera photos before uploading to a website or CMS
- Reducing image sizes for email attachments
- Preparing product photos for e-commerce pages
- Shrinking JPEG images for faster social media sharing
- Batch-compressing multiple photos at once
How to use
- Drop JPEG files onto the upload area, or click
Browseto select them. - Adjust the quality slider (80% is a reliable starting point for most photos).
- Click
Compress & Downloadto process the files. - Review the size comparison shown next to each file name.
- Single files download directly; multiple files are packaged as a ZIP archive.
Tip: Re-compressing a JPEG that has already been compressed reduces quality further without a meaningful size benefit. Compress once at the setting you need.
FAQ
Only JPEG files are accepted?
Yes. This tool is designed specifically for JPEG images (.jpg and .jpeg files). For PNG or WEBP compression, use the dedicated PNG Compressor or WEBP Compressor.
How does the quality slider work?
It controls how aggressively the JPEG encoder discards image data. 100% is near-lossless; 1% is maximum compression with severe artifacts. Most users find 70–85% ideal.
Will compressing reduce visible quality?
At moderate settings (above ~70%), most photos look nearly identical to the original. Below 60%, compression artifacts may become visible, particularly in areas with smooth colour gradients.
Can I compress multiple JPEG files at once?
Yes. Select or drop multiple files and they will all be processed together. The compressed output is downloaded as a single ZIP archive.
Are my images uploaded to a server?
No. All compression runs entirely in your browser. Nothing is sent to any server.
Why does it say "already optimized"?
Some JPEG files are already compressed near their minimum size for the quality level you chose. When the re-encoded file would be larger than the original, the tool returns the original file unchanged.