Look inside any JPG or JPEG - the real quality setting, chroma subsampling, camera EXIF, GPS location, colour profile and every marker. Only need the quality? The JPG Quality Checker does batches.
Sharing photos online? Strip the location first with the EXIF Data Remover.
JPEG does not store a "quality" number.
Instead it stores quantization tables - how coarsely each detail is rounded.
The analyzer compares those tables with the standard ones used by libjpeg, GIMP, browsers and most apps, and finds the quality that produced them. For standard encoders the match is exact. Cameras and some editors use their own tables, so the number is shown as an estimate.
| Mode | Colour detail | Typical use |
|---|---|---|
| 4:4:4 | Full | Quality 90+, graphics with text |
| 4:2:2 | Half horizontally | Some cameras |
| 4:2:0 | Quarter | Most photos and the web |
| 4:1:1 | Quarter horizontally | Old video, rare |
4:2:0 is invisible on photos, but red text and thin coloured lines turn blurry. For screenshots use PNG - JPG to PNG will not bring detail back, so save the original as PNG instead.
Drop it into the box. The quality line shows the estimated setting (1-100) and whether it matched the standard tables exactly. For many files at once use the JPG Quality Checker.
Yes, if the camera saved GPS coordinates. The Metadata tab shows them with a map link. The checks warn you so you can remove them before sharing with the EXIF Data Remover.
A baseline JPEG loads top to bottom. A progressive JPEG shows a blurry full picture first and sharpens in passes. Progressive files are often slightly smaller.
Usually quality 95-100, 4:4:4 subsampling or big metadata. Compress JPG brings most photos down 50-80% with no visible change.
Yes. .jpg, .jpeg, .jfif and .jpe are the same format. The analyzer reads all of them.
The camera stored an EXIF orientation tag instead of rotating the pixels. The Details tab shows the orientation value.
No. The JPG is read in your browser and never leaves your device.