CheckBefore
Check a file

FREE FILE SHARING CHECK

Check Hidden File Information Before Uploading to AI

Check supported file metadata, hidden information, and content risks locally before uploading a document or image to an AI assistant.

Processed locally in your browserYour original stays unchanged. The file and filename are not uploaded for a standard scan.
⌁
proposal.docxReady to upload
Local checkExample
  • Personal infoPattern flagged
  • AuthorExample author
  • Hidden sheetForecast

Supported text patterns are checked locally; content is not 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
⌁ Your original stays on this device◌ No account needed for a free check

Choose a file or drop it here

SUPPORTED COVERAGE

What can be detected

  • Supported personal-information and exposed-secret patterns in TXT, CSV, XLSX, DOCX, and text-layer PDF content
  • 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

ONE LOCAL WORKSPACE

How it works

  1. SelectChoose a supported file from this device.
  2. UnderstandReview the evidence and the stated scan limits.
  3. CleanCreate a separate copy with only supported items removed.
  4. RescanCheck the latest copy again and review anything left unchanged.

HONEST BOUNDARIES

What CheckBefore 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.
  • Content matching is pattern-based and applies only to supported text structures; images are metadata-only because image OCR is not included.
Scan Files for Personal Information and Exposed SecretsCheck supported text, CSV, Excel, Word, and text-layer PDF files locally for likely personal information and exposed secrets before you share them.Check File Metadata Before Uploading to ChatGPTBefore uploading a file to ChatGPT, check supported metadata, hidden information, personal-information patterns, and exposed secrets locally in your browser.Check and Remove Metadata from a Word DocumentCheck a DOCX locally for author, last editor, document properties, comments, tracked changes, hidden text, links, and embedded content before sharing.Check Excel for Hidden Data and MetadataCheck an Excel workbook locally for hidden sheets, hidden rows and columns, comments, author properties, links, connections, and embedded content.

See all supported file checks on the CheckBefore homepage

Check Hidden File Information Before Uploading to AI | CheckBefore