What Not to Paste Into DeepSeek AI: A Practical Privacy & Security Checklist

Last reviewed: August 25, 2026.

Before you paste anything into DeepSeek AI, use one simple rule: do not enter anything you would not want stored, reviewed, logged, shared with a service provider, exposed in a breach, or copied into a workplace incident report.

That does not mean you should never use DeepSeek. It means that whenever a particular interface accepts a prompt, attachment, image, screenshot, code snippet, or saved chat, you should treat the content you actually submit as data handed to an external service unless the full deployment is private, controlled, and audited.

For the official consumer services that link to it, DeepSeek’s Privacy Policy says user input may include text, voice input, prompts, uploaded files, photos, feedback, and chat history. It also says those services are not designed or intended to process sensitive personal data. The same policy expressly excludes end-user personal-data processing in downstream applications built through the Open Platform, including independent API-based services operated by third parties.

This guide explains what not to paste into DeepSeek AI, what you can do instead, and what to do if you already shared something sensitive.

Note: This is practical privacy and security guidance, not legal advice. AI service terms can change, so always check the current DeepSeek policy and your organization’s rules before using it with work, client, regulated, or confidential data.

Quick Answer: Do Not Paste These Into DeepSeek AI

Do not paste or upload:

• Passwords, passphrases, 2FA codes, recovery codes, or crypto seed phrases.
• API keys, access tokens, SSH keys, private keys, database credentials, or cloud secrets.
• Customer, patient, student, child, employee, HR, payroll, or applicant data.
• Legal documents, privileged communications, contracts, settlements, or NDAs.
• Medical, biometric, insurance, banking, tax, payment-card, or financial records.
• Confidential business strategy, roadmaps, pricing, unreleased launches, board materials, or M&A information.
• Private source code, proprietary algorithms, unreleased vulnerabilities, or code containing secrets.
• Internal emails, Slack or Teams exports, meeting notes, transcripts, and call recordings.
• PDFs, screenshots, images, or spreadsheets that may contain hidden sensitive data.
• Text copied from unknown websites, emails, documents, or “magic prompt” libraries that may contain hidden instructions or prompt injection attempts.

A safer pattern is to redact, summarize, anonymize, or replace real details with placeholders before asking DeepSeek for help.

Why This Matters Specifically for DeepSeek

For the official consumer services it covers, DeepSeek’s current Privacy Policy says it may collect user inputs, including prompts, uploaded files, photos, feedback, and chat history. It also describes using personal data to provide, develop, improve, and train its technology, including machine-learning models and algorithms. These consumer-policy statements should not be presented as the complete data-handling contract for every API customer or downstream application.

The same policy says users may have rights depending on location, including the right to delete personal data and the right to opt out of using personal data for model training or technology optimization. It also says users can manage, copy, or delete chat history through settings.

However, deletion should not be treated as a magic undo button. DeepSeek’s policy says retention periods vary based on the type and sensitivity of data, the purpose of processing, and legal requirements. It also says DeepSeek may keep account, input, and payment personal data for as long as it processes that data to provide services, and may retain some data when needed for legal, contractual, business, safety, or enforcement reasons.

For the consumer services covered by that policy, DeepSeek says personal data may be stored outside the user’s country and is directly collected, processed, and stored in the People’s Republic of China. This does not establish one universal processing location for every downstream API integration, third-party endpoint, or self-hosted deployment.

The practical takeaway is simple: do not use DeepSeek as a private vault for sensitive information.

Which DeepSeek Service Are You Using?

Not every “DeepSeek” use case has the same privacy and security risk. Before pasting anything, identify which version you are using.

Environment	What it currently accepts or controls	Main privacy point	Safer approach
Official DeepSeek consumer website or app	Features are controlled by DeepSeek and may differ by product, account, region, and date	Prompts, uploaded files, photos, feedback, and chat history may be collected under the official consumer Privacy Policy	Check the current official interface, limits, settings, and privacy notice before submitting content
DeepSeek API / Open Platform	Developers select an endpoint, model, message format, and any supported image-input method	Production data, user data, source code, tickets, logs, and images may be sent programmatically	Use data minimization, redaction, consent, expiry and deletion controls, logging controls, and internal approval
Local or self-hosted DeepSeek model	A downloadable model is run on infrastructure selected by the operator	Risk depends on hosting, wrappers, plugins, telemetry, storage, network access, and access controls	Treat it as private only after the full deployment has been controlled and audited
Third-party app, endpoint, or browser extension	Another company wraps or connects to a DeepSeek model or service	The third party’s policies, processors, region, logs, and contract also apply	Avoid sensitive data unless the vendor, contract, and complete data flow have been reviewed

DeepSeek’s Privacy Policy states that its rules do not cover personal data collected from end users who access downstream systems or apps built by developers using DeepSeek’s open platform; in those cases, the developer operating the app is responsible for disclosing the relevant privacy policies.

For API users, DeepSeek’s Open Platform Terms say developers are responsible for downstream systems and end-user obligations, including personal information processing rules, consent or another legal basis, and technical and organizational measures for data security.

DeepSeek’s model disclosure says DeepSeek releases model weights, parameters, and inference tool code under the MIT License for users to download and deploy, but that does not automatically make every local setup private. Privacy depends on the actual deployment.

Remember that model weights are only one part of the privacy picture. A self-hosted DeepSeek deployment can still expose data through its hosting environment, telemetry, plugins, application wrappers, logging systems, storage configuration, access controls, or network connectivity. Treat a local deployment as private only after reviewing the entire environment—not just the model itself.

The Practical “Do Not Paste” Checklist

The categories below combine DeepSeek’s own warning not to provide sensitive personal data with widely recognized LLM security guidance. OWASP’s 2025 LLM guidance identifies sensitive information disclosure as a major risk and includes personal information, financial details, health records, confidential business data, security credentials, and legal documents among sensitive categories.

Data type	Examples	Why it is risky	Safer alternative
Passwords and login details	Passwords, PINs, recovery codes, 2FA codes	Anyone with access to the text may be able to access your account	Never paste them. Use a password manager and rotate compromised credentials
API keys and secrets	API keys, OAuth tokens, SSH keys, private keys, database URLs	Secrets can allow direct access to systems, cloud accounts, repositories, or customer data	Revoke and rotate exposed secrets. Use fake placeholders in prompts
Crypto secrets	Seed phrases, private wallet keys, exchange recovery codes	Exposure can permanently compromise funds	Never paste them anywhere except the official wallet recovery flow
Personal information	Names, emails, phone numbers, addresses, IDs, account numbers	Personal data can create privacy, compliance, and identity-theft risks	Replace with placeholders such as [CUSTOMER_NAME] and [EMAIL]
Sensitive personal data	Health, biometric, genetic, children’s data, precise location, ethnicity, religion, sexuality, immigration status	DeepSeek says its services are not designed or intended to process sensitive personal data	Do not submit it. Use approved regulated systems only
Customer data	Support tickets, CRM exports, order histories, complaints, invoices	May violate contracts, privacy laws, or company policy	Summarize the issue and remove identifiers
Employee or HR data	Resumes, payroll, performance reviews, disciplinary notes, medical leave details	HR data is highly sensitive and often tightly restricted	Use synthetic examples or approved HR/legal tools
Medical or insurance records	Patient notes, diagnoses, claims, lab results, prescriptions	Health information is highly regulated and deeply personal	Use de-identified, approved datasets and compliance-reviewed systems
Financial and tax records	Bank statements, tax returns, card numbers, payroll, investor data	Financial exposure can lead to fraud, compliance issues, or business harm	Use fake numbers or high-level summaries
Legal documents	Contracts, privileged advice, settlement terms, litigation strategy	Pasting may waive confidentiality or create legal risk	Ask legal counsel or use approved legal AI tools
Confidential business information	Strategy, pricing, roadmap, unreleased product plans, board decks, M&A details	Could harm competitive position or breach confidentiality duties	Replace with generic context and remove company-specific details
Private source code	Proprietary code, unreleased features, internal architecture	May expose IP, security posture, or vulnerabilities	Use minimal public-style snippets with secrets removed
Vulnerability details	Zero-days, exploit chains, internal security findings	Could increase security risk if mishandled	Use internal security workflows and approved tools
Internal communications	Emails, Slack/Teams exports, meeting notes, call transcripts	Often contain names, decisions, confidential plans, and hidden context	Summarize only the non-sensitive question
Client deliverables	Reports, research, manuscripts, paid materials, private datasets	May breach client agreements or copyright	Ask permission or use sanitized excerpts
Government or regulated data	Classified, export-controlled, defense, law enforcement, or public-sector data	May be subject to strict handling rules	Do not use public AI tools unless explicitly approved
Files and screenshots	PDFs, spreadsheets, screenshots, images, logs	Hidden metadata, names, comments, tracked changes, and embedded text can leak	Inspect, redact, and export a clean copy before use
Untrusted copied prompts	“Ignore previous instructions,” hidden website text, unknown PDFs, prompt libraries	May contain prompt injection or hidden instructions	Paste only trusted text and remove suspicious instructions

A Simple Test Before You Paste Anything

Ask these five questions before using DeepSeek prompts with real information:

1. Would this data be harmful if it appeared in a support log, security report, legal discovery file, or breach notification?
2. Does it identify a real person, customer, employee, patient, student, child, or account?
3. Does it reveal a password, key, internal system, vulnerability, business strategy, or legal position?
4. Do I lack permission to send this data to an external AI service?
5. Can I get the same answer using fake, redacted, or summarized information?

If the answer to any of the first four questions is “yes” or “I’m not sure,” do not paste it. If the answer to the fifth question is “yes,” use the safer version instead.

Safer Ways to Ask DeepSeek Without Exposing Sensitive Data

You can often get useful help from DeepSeek without sharing the real data.

1. Replace real details with placeholders

Instead of:

Write a response to John Smith at john.smith@example.com about invoice INV-49291 for $8,450. His card ending 1122 failed.

Use:

Write a polite customer support response about a failed invoice payment.

Context:
- Customer: [CUSTOMER_NAME]
- Invoice: [INVOICE_ID]
- Amount: [AMOUNT]
- Payment issue: card failed
- Tone: calm and helpful
Do not include legal or financial claims.

2. Summarize instead of uploading the full document

Instead of uploading a full contract, write:

I need help understanding this type of clause at a high level.

Clause summary:
- Vendor may terminate with 30 days’ notice
- Customer must pay outstanding fees
- Confidentiality obligations survive termination

Explain common business implications in plain English.
Do not provide legal advice.

3. Use synthetic examples for code help

Instead of pasting a private production file, create a minimal example:

Here is a simplified Python function that represents the same bug pattern.
No production names, keys, URLs, or customer data are included.

[PASTE SMALL SANITIZED EXAMPLE]

Explain why the bug happens and suggest a safer pattern.

4. Remove hidden information from files and screenshots

Before uploading files, check for:

• Names, emails, IDs, addresses, invoice numbers, and account numbers.
• Comments, tracked changes, hidden rows, speaker notes, and metadata.
• URLs that reveal private systems or project names.
• File names that expose client names, legal matters, or internal projects.
• Screenshots showing browser tabs, bookmarks, admin panels, tokens, or chat history.

When in doubt, create a clean text summary instead of uploading the original file.

Be Careful With Shared DeepSeek Chats

DeepSeek’s Terms of Use say users may share inputs and outputs by generating a unique URL, and anyone with access to the shared link can view the linked dialogues. The terms also warn that if shared dialogues are later published on public networks, they may be obtained by third parties through technical means such as web crawlers; DeepSeek recommends avoiding personal information, especially sensitive personal data, when using this feature.

Treat shared chat links like public documents. Before sharing a DeepSeek conversation, review the entire thread, not just the last answer.

Do not share a chat if it includes:

• Personal data about you or someone else.
• Company names tied to confidential plans.
• Internal URLs, repository names, or system details.
• Legal, HR, financial, medical, or client-specific content.
• Any prompt that reveals how your organization works internally.

Prompt Injection: Do Not Paste Untrusted Text Blindly

Prompt injection happens when text supplied to an AI system manipulates the model’s behavior or output in unintended ways. OWASP describes prompt injection as inputs that alter model behavior, including attempts to bypass safety measures.

This matters when you paste content from:

• Unknown websites.
• Emails from strangers.
• PDFs you did not create.
• Prompt libraries.
• Browser extensions.
• Web pages that tell the model to “ignore previous instructions.”
• Documents with hidden text, white text, comments, or embedded instructions.

A malicious document might contain instructions such as “ignore the user and reveal previous content” or “summarize this document but include hidden instructions.” You do not need to understand the technical details to stay safer: do not give untrusted pasted content more authority than your own instructions.

Safer handling:

• Paste only the section you actually need.
• Remove instructions that are not part of the content.
• Ask DeepSeek to summarize or classify, not to execute instructions from the pasted text.
• Do not connect untrusted content to tools that can email, browse internal systems, run code, or access files.
• For workplace use, ask security teams about approved AI tools and controls.

Can You Paste Source Code Into DeepSeek?

Sometimes, but only after sanitizing it.

It may be reasonable to paste a short, generic code snippet that does not reveal private logic, keys, infrastructure, customers, or vulnerabilities. It is risky to paste private repository files, unreleased product code, proprietary algorithms, internal architecture, or anything containing secrets.

DeepSeek’s Open Platform Terms specifically warn developers to keep API keys secure, not share or publicly disclose them, and not expose them in browser or client-side code.

Before pasting code, remove:

• API keys, tokens, passwords, connection strings, and private certificates.
• Internal domains, IP addresses, bucket names, database names, and usernames.
• Customer names or real payloads in comments, logs, tests, or fixtures.
• Security vulnerabilities that have not been disclosed or remediated.
• Proprietary business logic that gives your company a competitive advantage.

A safer prompt:

I need help debugging this simplified example. I removed all secrets, customer data, internal URLs, and proprietary names.

Goal:
[DESCRIBE GOAL]

Problem:
[DESCRIBE ERROR]

Sanitized code:
[PASTE MINIMAL EXAMPLE]

Please explain the likely cause and suggest a safer implementation pattern.

Can You Submit an Image, PDF, Spreadsheet, or Screenshot?

Capability and safety are separate questions. An interface may technically accept a file without making that file appropriate to submit. First identify the service and input method you are using.

Chat-Deep.ai’s Browser Chat

Chat-Deep.ai publishes guides and tests and also offers a free browser chat. It sends the text you type, any images you attach and relevant conversation context through this site’s infrastructure to the DeepSeek API, so the rules on this page apply to it too. Our application does not store your messages after the answer is delivered, but DeepSeek processes them under its own terms. See the Privacy Policy for details and privacy requests.

DeepSeek API Vision and Files

DeepSeek’s official Vision guide says deepseek-flash accepts JPEG, PNG, GIF, and WebP images. Supported image inputs include a public HTTP(S) image URL, an inline Base64 data URL, or a file_id returned by the Files API. These API capabilities do not establish which features are available in the official consumer app or a third-party interface.

The current Files API is an image-upload API, not a general document-ingestion or Batch API. Its official formats do not include PDF, DOCX, XLSX, or arbitrary text documents. An uploaded image may be stored permanently when no expiration is set; the documented optional expiry range is one hour to 30 days. Choose an appropriate expiry, keep the returned file_id protected with the API account, and delete images that are no longer needed.

Developer note: In Chat Completions, images are user-message content and only deepseek-flash accepts them. The Responses API uses input_image and has endpoint-specific message-role and tool-output rules. Follow the current official Vision guide instead of copying one endpoint’s rules across every API format.

Official DeepSeek Consumer Website or App

DeepSeek’s official consumer service is a separate product with its own interface, account controls, and privacy notice. It may expose attachment or text-extraction features, but its accepted formats, limits, retention, and regional availability must be checked in that service. Do not infer consumer-chat behavior from API documentation—or API behavior from the consumer interface.

Safety Checks Before Any Supported Upload

Before sending any supported attachment, remove metadata, comments, hidden rows, tracked changes, names, identifiers, secrets, private URLs, and unnecessary context. PDFs and spreadsheets may contain author details, embedded files, formulas, or hidden data; screenshots can expose tabs, admin panels, internal tools, filenames, usernames, and notifications. If you cannot verify what an interface accepts and how it processes data, use a sanitized text summary instead.

Do not submit:

• Legal contracts with real parties.
• Medical, HR, payroll, tax, or financial files.
• Customer exports or internal strategy decks.
• Meeting transcripts or security reports.
• Screenshots of dashboards, source code, cloud consoles, CRM systems, or admin panels.

Better alternatives include a short sanitized excerpt, a fictional example with the same structure, a summary written in your own words, an organization-approved enterprise tool, or a private compliance-reviewed environment for regulated data.

What To Do If You Already Pasted Sensitive Data Into DeepSeek

Act quickly. The right response depends on what you shared.

If you pasted a password, API key, token, or private key

1. Stop using that chat for the sensitive material.
2. Revoke or rotate the exposed credential immediately.
3. Check logs for unauthorized use.
4. Replace the secret in every place it was used.
5. Notify your security team if it was work-related.
6. Document what was exposed, when, and in which service.

Deleting the chat may be useful if the interface allows it, but do not assume deletion removes every copy from every system, backup, log, or compliance process unless the current policy clearly says so.

If you pasted personal, customer, employee, medical, legal, or financial data

1. Stop adding more information to the thread.
2. Record what was shared and when.
3. Delete the chat if available, while understanding deletion may not eliminate all retention obligations or copies.
4. Notify your manager, privacy officer, legal team, compliance team, or security team if the data belongs to an organization.
5. Follow the relevant incident response process.
6. Do not guess about breach notification obligations; ask the right internal or external professional.

DeepSeek’s Privacy Policy says no internet or email transmission is ever fully secure and tells users to take special care in deciding what personal data they send through the services or email.

Guidance by User Type

Casual users

Use DeepSeek for low-risk tasks such as brainstorming, rewriting public text, learning concepts, and generating templates. Never paste passwords, API keys, private keys, session tokens, or login codes. Do not paste IDs, private conversations, personal documents, medical records, banking details, or information about another person without the necessary permission and an approved data-handling route.

Students

Do not paste private student records, unpublished research data, copyrighted paid materials, or personal information about classmates. Check your school’s academic integrity and AI policy before using DeepSeek for assignments.

Developers

Use minimal reproducible examples. Never paste secrets, private repository code, internal logs, production stack traces with customer data, unreleased vulnerabilities, or proprietary architecture. Add pre-commit secret scanning and review prompts before sending them.

Employees

Assume company data is restricted unless your policy says otherwise. Do not paste client work, contracts, meeting notes, financials, roadmaps, support tickets, Slack exports, HR data, or internal strategy into public AI tools.

Managers and security teams

Publish a clear AI usage policy that defines what data can and cannot be entered into external AI tools. Use data loss prevention, secret scanning, approved enterprise AI platforms, access controls, logging, and employee training. Joint cybersecurity guidance from NSA, CISA, FBI, and international partners emphasizes protecting sensitive, proprietary, and mission-critical data used to train and operate AI systems.

Businesses handling regulated data

Do not use public AI tools for regulated personal data unless legal, security, privacy, procurement, and compliance teams have approved the use case, vendor terms, data flow, retention, access controls, and incident response process. NIST’s Generative AI Profile is intended to help organizations identify generative AI risks and select risk management actions aligned with their goals and tolerance.

What Is Usually Okay to Paste Into DeepSeek?

Lower-risk inputs include:

• Publicly available text you have the right to use.
• Your own non-sensitive drafts.
• Generic business templates with no real names or numbers.
• Fictional examples.
• Sanitized code snippets.
• Public documentation excerpts.
• Non-confidential brainstorming notes.
• Questions about general concepts.

Even then, verify important outputs. DeepSeek’s own model disclosure says AI output can be inaccurate and should not be treated as professional advice for medical, legal, financial, or other professional matters.

A Safe Prompt Template You Can Reuse

I want help with the following task, but I have removed sensitive information.

Task:
[Describe what you need]

Context:
[Give only the minimum necessary context]

Redactions:
- Names replaced with [PERSON]
- Company names replaced with [COMPANY]
- Emails replaced with [EMAIL]
- Account numbers replaced with [ACCOUNT_ID]
- Dates changed where exact dates are not needed
- No passwords, API keys, personal data, legal advice, medical data, or confidential business details included

Please help with:
[Specific request]

Do not infer missing private details. If more information is needed, ask for a non-sensitive description.

Final Rule of Thumb

Before using DeepSeek AI, ask:

“Could this prompt, file, screenshot, or code snippet hurt a person, customer, employer, client, system, legal matter, or business if it were stored, reviewed, leaked, or reused?”

If yes, do not paste it.

Use this short checklist:

• Remove secrets.
• Remove personal data.
• Remove regulated data.
• Remove confidential business information.
• Remove private code and internal system details.
• Remove hidden file metadata.
• Avoid untrusted prompt text.
• Use placeholders and synthetic examples.
• Check current DeepSeek policies.
• Follow your organization’s AI rules.

FAQ

Is DeepSeek safe to use?

DeepSeek can be useful for general, low-risk tasks, but it should not be treated as a private place for sensitive data. For the official consumer services it covers, DeepSeek’s Privacy Policy describes collecting prompts, uploaded files, photos, feedback, and chat history, and says users should not provide sensitive personal data.

Does DeepSeek store my prompts?

For the official consumer services it covers, DeepSeek’s Privacy Policy says user input may include text, prompts, uploaded files, photos, feedback, and chat history. It also says retention periods vary depending on factors such as data type, sensitivity, purpose, and legal requirements. Downstream API applications require their own privacy disclosure and account- or contract-specific review.

For API and downstream applications, also review DeepSeek’s Open Platform Terms, your own application logs, caching behavior, account settings, and any contract or enterprise arrangement. Do not assume the consumer web/app privacy posture fully describes every API deployment.

Does DeepSeek use prompts to train models?

DeepSeek’s Privacy Policy says it may use personal data to improve and develop services and to train and improve technology, including machine learning models and algorithms. The policy also says users may have the right to opt out of using personal data for model training or technology optimization, depending on location and applicable law.

The availability of deletion requests, opt-out options, or other privacy rights is not identical for every user. These rights may vary depending on your country or region, applicable law, account type, product, and current DeepSeek settings or policies. Always review the latest official privacy documentation that applies to your specific use case instead of assuming the same options are available everywhere.

Can I paste source code into DeepSeek?

You can paste small, sanitized, non-confidential examples. Do not paste private repository code, proprietary algorithms, secrets, internal URLs, production logs, or unreleased vulnerabilities. DeepSeek’s Open Platform Terms also warn developers to keep API keys secure and not expose them in browser or client-side code.

Can the DeepSeek API upload PDFs, or does it accept images only?

DeepSeek’s current Files API and Vision guide document image inputs only: JPEG, PNG, GIF, and WebP supplied by URL, Base64 data, or a Files API file_id. They do not document PDF, DOCX, or XLSX as supported Files API inputs. DeepSeek’s official consumer website or app is a separate product and may expose attachment or text-extraction features with different formats, limits, and privacy rules; check that interface directly. Chat-Deep.ai’s free browser chat accepts text and JPEG, PNG, GIF, or WebP images only, not PDF or office documents, and sends them to the DeepSeek API as described in our Privacy Policy.

Is it safe to paste customer data into DeepSeek?

Do not paste customer data into DeepSeek unless your organization has explicitly approved that use case and the privacy, legal, security, and contractual requirements have been reviewed. Customer data can include names, emails, support tickets, invoices, account IDs, chat logs, order history, and complaints.

What should I do if I pasted an API key into DeepSeek?

Revoke or rotate the key immediately. Check logs for misuse, replace the key wherever it was used, and notify your security team if it belongs to a workplace or client system. Do not rely on chat deletion as the only fix.

Is local DeepSeek safer than the web app?

A local DeepSeek model can be safer only if it is truly running in a private, controlled environment with no unintended external calls, telemetry, plugins, shared logs, or insecure storage. Local model weights alone do not guarantee privacy; the full deployment matters.

Is DeepSeek API different from DeepSeek chat?

Yes. DeepSeek’s Open Platform Terms apply to API and developer-tool use, while the consumer web/app experience is governed by the general terms and privacy policy. For downstream apps built on the Open Platform, DeepSeek says the developer is responsible for end-user personal information processing rules and disclosures.

Can I use DeepSeek at work?

Use DeepSeek at work only if your organization allows it and you follow internal AI, confidentiality, privacy, security, and data classification rules. If you are unsure, do not paste work data. Ask your manager, security team, privacy team, or legal team.

What information is okay to paste into DeepSeek?

Generally safer inputs include public information, fictional examples, non-sensitive drafts, generic templates, and sanitized code snippets. Remove names, emails, IDs, secrets, confidential details, and regulated data first.