FREE FILE SHARING CHECK

Check Hidden File Information Before Uploading to AI

Before you upload a file to an AI assistant, check it locally for supported metadata, author details, hidden spreadsheet content, file properties, and image information. Standard scanning happens locally in your browser.

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proposal.docxReady to upload

Local check3 details found

AuthorMorgan Lee
File propertyInternal proposal
Hidden sheetForecast

Visible text is not inspected or redacted.

Example only — the check happens in your browser before the file is uploaded elsewhere.

PRIVATE SCAN WORKSPACE

Check a file before it leaves your hands.

Start with 2 free checks — no account needed.Original stays unchanged.

Processed locally

Choose a file or drop it hereBrowse from this deviceExcel, Word, PDF, JPEG, PNG, or WebP · Maximum file size: 20MB · Processed locally

⌁ Your original stays on this device◌ No account needed for a free check

Choose a file or drop it here

What this tool checks

Supported document metadata and file properties
Author and editor details in supported Office files
Hidden sheets, rows, and columns in Excel workbooks
Supported EXIF, XMP, IPTC, and text metadata in images

What it does not do

It does not redact, rewrite, or anonymize visible document text, spreadsheet cell values, or image pixels.
It cannot decide whether the visible content is safe to share, and it does not guarantee a file is safe.
It checks only supported formats and supported hidden-information signals.

Processed locally in your browser

For standard scans, CheckBefore processes the selected file in your browser. Your original file and its filename are not uploaded to CheckBefore for that scan, and the original stays unchanged.

How it works

Choose your file, review detected sharing risks, remove only items marked safe to remove, then verify the resulting copy before download.

FAQ

Does CheckBefore guarantee a file is safe?

No. A result reflects only the supported checks performed. Review visible content and every item marked for a manual check before sharing.