Adjust images in batches
When a set of photos all came out slightly dark, fixing them one by one in a photo app is the slow way. Set the sliders once, apply to everything.
- Runs entirely in your browser
- Works offline
- No upload
- No sign-up
- No watermark
Loading the tool…
How it works
- Drop your images.
- Move the sliders — every one starts at its neutral point.
- Process and download them individually or as a ZIP.
Why nothing is uploaded
Every operation on this page is done by code running inside your browser tab, using the same engine that renders web pages. The file is read from disk into your tab’s memory, transformed there, and written back out as a download. It is never sent anywhere — not to us, not to a third party.
Verify it yourself
- Open your browser’s developer tools (F12) and select the Network tab.
- Load your file and run the tool.
- The only requests you will see fetch the tool’s own code — and, for a few heavy tools, their open-source engine from a public CDN — plus one small page-view ping to loreatec.jp (page address and title, nothing more). None of them carry your file.
Frequently asked questions
Is this as good as a photo editor?
No, and it is not trying to be. There is no per-image preview and no selective editing. It applies one correction to many files, which is the job photo editors are slowest at.
What does sharpening actually do?
It makes each tiny dot (pixel) stand out more from the dots around it, which the eye reads as more detail. It cannot bring back detail that is not in the photo, and pushed too far it draws bright halos along edges.
Will it hurt quality?
Each time a JPG is saved it is compressed again, so processing the same JPG over and over slowly lowers its quality. Start from the originals rather than from a previous result.
Are the photos uploaded?
No. The adjustments are made with the browser’s own built-in image filters, on your computer. The files never leave the tab.