Compress JPEG to 300 KB

Compress a JPEG to 300 KB without uploading it.

or drop an image anywhere on this page

JPEG only (.jpg, .jpeg) · up to 50 MB

Files never leave your device
Free, no sign-up
No watermark

How to use this tool

Choose a JPEG file, or drag it onto the drop area. Only .jpg and .jpeg files are accepted on this page.
Check the target size (currently 300 KB). It is editable, so change the number or the KB/MB unit if your limit differs.
Press the button. The tool lowers the quality first, then reduces the dimensions step by step if the file is still too large.
Compare the preview and the measured output size with the original, and read any notes or warnings.
Download the new file. If it missed the target, adjust the target slightly or crop the original, and try again.

What to know before you compress JPEG to 300 KB

Three hundred kilobytes leaves space for a high-quality JPEG at generous dimensions, so photographs remain crisp and scanned documents stay readable even with small print. Many portals and email systems choose limits in this region because they balance clarity with upload speed. A phone photo of 3 to 6 MB must lose roughly 90 to 95% of its weight, and because JPEG is efficient at moderate quality, most of that reduction comes from a quality drop that is hardly visible. Only when the file is still above 300 KB does the tool shrink dimensions. Highly detailed pictures, such as crowded scenes or textured surfaces, need more reduction than portraits. If the result still seems heavy for your needs, 150 KB or 200 KB will cut it further.

Three hundred kilobytes is plenty for a detailed photo at typical screen widths and a common limit for document portals. The size you enter is a goal, not a promise: the result depends on the original image, its dimensions, its complexity, its format and your browser's encoder, and the tool reports the real size instead of assuming it.

Recommended settings and supported formats

This page accepts JPEG only. Keep the 300 KB default or edit it. Compress from the original file and check the preview at actual size to be sure it meets your quality needs.

Accepted input: JPEG (.jpg, .jpeg). Output is always JPEG, and transparent areas, if any, are filled with white.

Practical uses

Document and certificate uploads on portals with mid-sized limits
High-quality web images for hero sections and galleries
Sending photos by email while keeping good detail

Tips for a smaller file

Start from the highest-quality original you have.
Check readability of small text in scans.
Choose a lower target if page speed matters more than detail.
Avoid saving the file through multiple apps that re-compress it.

Frequently asked questions

How large is a 300 KB JPEG in pixels?

It varies with detail and content, so there is no fixed answer. The exact dimensions are shown with the result.

Does 300 KB keep text readable in scans?

Usually, if the scan is moderate resolution. Check the preview at full size before you upload.

What if my result is still above 300 KB?

The tool reports that it could not reach the target. Crop the picture or lower the target slightly and try again.

Related image size tools

Privacy

Your image is processed entirely in your browser using your own device. It is not uploaded to Paul Digital or any other server, and nothing is stored once you close the page.