I’ve been working on a browser-based metadata tool recently, and one thing surprised me: an image can contain much more information than what we see on the screen.
Depending on the device and software, a photo may include:
- The camera or phone model
- The date and time it was taken
- GPS coordinates
- Editing software
- Copyright and author information
- AI generation parameters or workflow data
Most of this information is harmless. But sometimes it can reveal more than the person sharing the image intended.
The interesting technical challenge is that metadata is not stored in exactly the same way across JPEG, PNG, WebP, and other formats. Each format has its own structure, chunks, and edge cases.
I’m currently exploring how much of this processing can be done directly in the browser, without uploading the file to a server.
Browser-side processing has some clear advantages:
- The file stays on the user’s device
- There is no upload delay
- The server does not need to store private files
- The tool can remain lightweight
There are also challenges, especially with large files, uncommon formats, and preserving the original image quality.
It has been a useful reminder that even seemingly simple tools can involve a lot of small technical and privacy decisions.
I’ll share more of what I learn as I continue building.
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