Compress JPEG

Make JPEG photos dramatically smaller for email, web and uploads — without visible quality loss.

Upload your JPEG images.
Each is re-encoded at an optimised quality.
Download the smaller files.

A photo straight from a camera or phone can be several megabytes — far more than email, a web page, or an upload form needs. compressjpeg.onl re-encodes your JPEG at a smart quality level that typically halves the file or better while keeping it sharp at normal viewing sizes. Upload one image or a whole batch; the results come back ready to download.

How JPEG compression actually works

JPEG is a lossy format: it discards image detail the human eye struggles to notice, then stores what remains efficiently. Lowering the quality setting discards a little more, which is why files shrink so much. The trick is choosing a quality that removes bytes without removing anything you can see — which is exactly what this tool is tuned to do.

Compress, don't just resize

Compression reduces file size at the same dimensions, so your photo still fills the screen — it just weighs less. If the image is also far larger than you need on screen, combine compression with the resizer for an even smaller result. Graphics and screenshots are better served by PNG compression.

Guides about Compress JPEG

JPEG compression how-to How to Batch Compress Images Quickly and Safely Compressing photos one by one is tedious. This guide shows how to batch compress many images at once with consistent settings, full speed, and total privacy. 5 min read Web performance How to Compress Images for a Faster Website in 2026 Unoptimized images are the top cause of slow web pages. This guide shows how to compress and size images for the web to speed up your site and lift SEO. 6 min read Email & upload limits How to Compress a JPEG to Fit Any Email Size Limit Email providers cap attachment size, so big photos bounce. This guide shows how to compress a JPEG under any limit while keeping it sharp and easy to send. 6 min read Quality vs size How to Compress Photos Without Losing Visible Quality You can shrink photos dramatically while keeping them sharp if you know the right techniques. This guide shows how to compress without any visible quality loss. 5 min read JPEG compression how-to How to Compress a JPEG: A Step-by-Step Guide for 2026 Compressing a JPEG keeps the picture sharp while cutting the file size. This guide walks you through the easiest online method and the settings that matter most. 5 min read Quality vs size JPEG Quality vs File Size: Finding the Perfect Balance The JPEG quality slider controls a direct trade-off between sharpness and size. This guide explains how it works and the settings that give you the best of both. 6 min read

More compressjpeg tools

Compress PNG Optimise PNG graphics to the smallest lossless size, keeping transparency and crisp edges. Compress to WebP Convert and compress images to WebP — the smallest modern web format. Resize Image Scale images down to web dimensions for an extra file-size win.

Frequently asked questions

How much smaller will my JPEG get?

Camera photos commonly shrink 40–70%. Images that are already small or heavily compressed have less room to improve.

Does compressing a JPEG lower its quality?

JPEG is lossy, but at the quality used here the change is invisible at normal viewing sizes. You lose bytes, not visible detail.

Can I compress many JPEGs at once?

Yes — batch uploads are supported and delivered together.

Is there a watermark or signup?

No watermark and no signup — the tool is completely free.