Labs · 🟢 Local sample verified · 1 November 2026 · Viewer and cleaner compared
Facebook image lab: what was in the local JPEG before a post?
Before I upload a Facebook photo, does this JPEG still contain GPS, and would a caption or an AI label tell me that?
A Facebook caption does not tell you the JPEG’s GPS. The local sample’s location and camera fields were gone after the clean. A label on the post is a separate layer. Clean the copy in this browser before sending. The file stays on this device and is not uploaded to this site.
Post text can mention a place without that place living in EXIF, and EXIF can hold a place the caption never shows.
Short answer
Direct answer: the local sample’s location fields were removed by the cleaner. A label on a post is a different layer.
- What was measured: On 1 November 2026 the viewer read GPS and camera-style fields. The cleaner copy omitted them.
- What that does not prove: Whether a label remains on a Facebook post is not decided by this before-and-after file read.
- What you can do first: Clean the copy in this browser before the file leaves the device. Nothing is uploaded to this site.
🟢 Local sample verified · 1 November 2026 · Viewer and cleaner compared
- Published
- Last updated
- Last tested
What we measured
Sample dated 2026-11-01. The viewer read location and camera fields. The cleaned file no longer has them. The file stayed on this device.
| Field | Local sample (viewer) | Cleaned copy (cleaner) |
|---|---|---|
| GPS / location | 35 deg 0' 0.00" N, 135 deg 0' 0.00" E | No GPS |
| EXIF | EXIF present (camera make, model, and settings) | EXIF fields cleared |
| Camera information | Camera make and model present | Camera make and model removed |
| Timestamps | 2026:11:01 18:00:00 | Capture time removed |
| Provenance / C2PA | JUMBF APP11 and a C2PA container | No C2PA or JUMBF container |
| Recompression / resize | 378,066 bytes, with location and the metadata above | 361,097 bytes; metadata removed, image scans unchanged |
GPS / location
The viewer read 35 deg 0' 0.00" N, 135 deg 0' 0.00" E. The cleaned file had no GPS.
EXIF
The viewer read a camera make, a model, and the capture time 2026:11:01 18:00:00. The cleaned file had no EXIF.
Test environment
Chrome 156.0.8078.47 and ExifTool 12.76. The file stayed on this device. Nothing was uploaded.
How to test your own file
- Same protocol as other platform labs: known source, recorded path, downloaded copy, hash compare.
Methodology
Every published result has to follow the same protocol: a known source file, a recorded hash, a specific upload path, and a downloaded copy. Folklore does not count.
Privacy implications
Sanitize location data before a Facebook post if the photo could place a person or a workplace.