Compress JPEG Online Free
Reduce JPG file size by up to 90% with no visible quality loss. Batch-compress up to 20 photos in your browser — nothing is uploaded, ever.
Why JPEGs compress so well
JPEG was designed around a simple insight: human eyes notice brightness far more than fine color detail. A JPEG encoder exploits this by storing color information at lower precision and approximating texture the eye glosses over — which is why a photograph can lose 80–90% of its bytes and still look identical on screen.
Most JPEGs you receive are nowhere near optimally encoded. Cameras and phones prioritize speed over size, saving at quality levels around 95 — far past the point of visible benefit. Re-encoding the same photo at quality 75 typically looks the same and weighs a fraction as much.
Best settings for common uses
Websites: quality 70–80, max width 1920 px. Email: quality 65–75, max width 1280 px — a dozen photos fit under the 25 MB limit. Social media: quality 80, 1280 px; platforms recompress anyway, so give their encoder a clean start. Printing: quality 90+, no resize.
Tips for the smallest files
Combine compression with resizing — file size scales with pixel count, so dropping a 6000 px camera photo to 1920 px saves more than any quality setting alone. If your images are destined for your own website, consider exporting as WebP instead: same tool, one click, and files come out another 25–35% smaller than JPEG.
JPEG Compression FAQ
How much smaller will my JPEG get?+
Most photos shrink 60–90% at quality 70–80. A typical 4 MB phone photo lands around 300–600 KB, and adding a resize to 1920 px often halves that again.
Does compressing a JPEG reduce quality?+
JPEG compression is lossy, but at quality 75+ the difference is invisible at normal viewing size. Use the before/after comparison on any thumbnail to judge for yourself before downloading.
Is my photo uploaded anywhere?+
No. Compression runs entirely in your browser using the Canvas API — the file never leaves your device.
Can I compress multiple JPEGs at once?+
Yes — drop up to 20 JPGs in one batch and download them all as a single ZIP.