How to Send Sensitive Documents Securely Online
The safest practical way to send sensitive documents online depends on what the document contains, who needs it, and whether a verified organization already provides a secure submission process. Use this guide to choose a method without creating unnecessary exposure or copies.
A practical document-sharing framework
Use this editorial framework, not an official government standard:
- 1Verify the recipient
- 2Check for an official workflow
- 3Minimize the document
- 4Protect the file or delivery
- 5Manage retention
Verify the recipient and the request
Confirm who requested the document, the destination address or account, why it is needed, and whether the request is expected. Independently verify unexpected requests. A professional-looking email, logo, signature, existing thread, or delivery channel does not by itself prove authenticity or verify identity. Sensitivity depends on the actual document: it may contain a Social Security number, taxpayer identifier, bank information, income, government ID data, signature, address, health information, or confidential business information.
Use the official workflow first
Use the organization's established authenticated document-submission workflow where available, after confirming that you are using the legitimate site or account. This is often appropriate for employer onboarding, lenders, accountants, attorneys, government agencies, and financial institutions. A portal does not guarantee end-to-end encryption, automatic deletion, or prevention of authorized staff access, but it can be preferable to improvising email or text delivery.
Choose a delivery method that fits the situation
| Situation | Better first option | Important limit |
|---|---|---|
| Verified organization provides a portal | Use the verified portal | Confirm the legitimate site or account |
| No portal; recipient accepts encrypted file | Encrypt file and deliver password separately | Recipient can retain a decrypted copy |
| Restricted sharing service available | Restrict access where supported | Downloaded copies may remain |
| Ordinary email requested | Verify recipient; consider file protection | Mailbox persistence and account compromise remain concerns |
Email attachments
Modern email commonly uses TLS in transit where supported, but ordinary email generally is not end-to-end encrypted by default. Attachments may remain in sender and recipient mailboxes and synchronized storage, and a compromised account can expose stored correspondence. Read our sensitive-information-by-email guide.
Encrypted files
A password-protected file can add protection when both parties support the workflow, but not all protection implementations are equivalent. Encryption does not verify identity, weak passwords weaken protection, endpoint compromise remains possible, and a recipient can retain a decrypted document. See our encrypted-file password guide.
Restricted sharing links and separate passwords
Where supported, a file-sharing service may offer named recipients, authentication, expiration, revocation, access permissions, or download restrictions. Capabilities vary by service and configuration. Prefer restricted access over public “anyone with the link” sharing for highly sensitive material when restrictive access is available. Revoking a link does not revoke copies already downloaded.
When an encrypted file is appropriate, send the decryption password separately from the encrypted file. This can reduce exposure if one location is compromised, but it does not verify identity, protect against compromise of both locations, prevent recipient copying, guarantee deletion, or repair weak file encryption.
Minimize the document and its copies
Provide what the verified workflow requires without voluntarily including additional unrelated sensitive information. Ask whether every page, field, identifier, account detail, or supporting document is needed. Use a redacted copy only where the recipient accepts it; some workflows require complete, unaltered documents. Consider how long the recipient retains the document, who can access it, and its policy for retention or deletion. Remove unnecessary local copies from Downloads, desktops, camera rolls, scanner apps, drafts, sent folders, and synchronized cloud folders when no longer needed, subject to legitimate recordkeeping needs. To protect saved records across your devices, learn how to store sensitive documents safely. Normal deletion does not guarantee erasure from every system or backup.
Where Paste & Purge fits
Paste & Purge does not accept PDFs, Word documents, ZIP files, images, scans, spreadsheets, or arbitrary file uploads; it handles text secrets only. If a verified recipient accepts an encrypted or password-protected file workflow, it may send the separate text decryption password through an encrypted secret link with a configured expiration and view limit.
It does not host or encrypt the document, verify the recipient or request, prevent copying, revoke already decrypted files, or replace an organization's official upload portal.
If you sent the document to the wrong person
Determine what was sent, revoke a sharing link where supported, and understand that revocation cannot remove downloaded copies. Contact the unintended recipient or intended organization where appropriate. Change actual exposed credentials if applicable and evaluate identity-theft measures according to the information exposed. The appropriate response depends on the document and circumstances.
Before you send a sensitive document
- Verified the recipient and destination
- Confirmed the request is expected
- Checked for an official submission portal
- Included only what is required
- Reviewed unnecessary sensitive fields
- Considered whether the file should be encrypted
- Planned separate password delivery if encrypted
- Restricted access where supported
- Considered retention and copies after delivery
- Double-checked the destination
Document-specific guidance
For specific workflows, follow dedicated security guides for medical records and health documents, employment and onboarding documents, proof-of-income and financial documents, government ID or passport copies, Social Security numbers, tax documents, and real-estate closing documents.