Why this tool is useful
Use Byte Order Mark Detector when you need to identify common UTF byte order marks from the first bytes of a local file while keeping the source file on your device.
Local File Tools · runs locally
Byte Order Mark Detector
Identify common UTF byte order marks from the first bytes of a local file entirely in your browser without uploading the selected file.
Ready. Your working data stays in this browser.
Files stay on this device. Processing uses browser APIs only; nothing is uploaded to YTSave, the media API or a proxy.
How it works
The browser validates the declared file type and 500 MiB limit, then runs the binary utility operation locally. No downloader job or proxy is involved.
Practical example
Choose a supported file, review the locally produced byte order mark, and download a result only when this operation creates one.
Validation
The calculation is deterministic and explains validation errors instead of silently changing invalid input.
Privacy boundary
Input and output remain in this tab. Copy and download happen through browser APIs without a server upload.
Result passport
Every run reports its tool mode, timestamp and input/output size so transformed data can be audited.