How to shrink JPG file size with adjustable quality

1. Upload the JPG

   Drop a `.jpg` or `.jpeg` file into the "Image" field. The tool keeps your original aspect ratio and dimensions; it only changes the encoder's quality setting.

2. Pick a quality

   "Quality" (1–100) controls the JPEG quantization level. 80–85 is the sweet spot for web use — visually indistinguishable from 100 on most photos but ~50% smaller. Drop to 60–70 if you need aggressive savings; go below 50 and ringing artefacts get visible.

3. Press Run

   Result returns `bytesIn`, `bytesOut`, and `savedPercent` alongside the new image. JPG is already lossy, so re-compressing a previously-saved JPG always loses extra information — never iterate.

4. Not for archive masters

   Use JPG output for the public web only. Keep your original photo as a raw or untouched JPG; re-export from that source whenever you need a different quality. Generation loss compounds quickly across saves.