Protect your documents
before any AI sees them
LexPrivacy automatically detects and masks the sensitive data in your legal documents before you send them to ChatGPT, Claude or any other AI tool. Free, local, and your documents are processed on your computer.
limit
on your computer
systems
How LexPrivacy pseudonymises
your legal documents
Load your PDF, Word or Excel document
Drag your document into LexPrivacy. The file stays on your computer and is processed locally.
Sensitive data detected automatically
In seconds, LexPrivacy identifies names, addresses, claim and case references and financial data, using detection built specifically for legal documents.
A pseudonymised document, ready for any AI
Jane Smith becomes [CLIENT_001] and claim number KB-2026-001234 becomes [REF_PROCEDURE_001]. The pseudonymised document can be used with ChatGPT, Claude or Gemini without exposing client data.
The data LexPrivacy
masks automatically
LexPrivacy understands the structure of legal documents. It finds generic personal data and also the identifiers specific to English and Welsh practice.
Identities of parties and lawyers
Names of clients, opposing parties, solicitors, barristers, judges and witnesses, pseudonymised consistently throughout the document.
Claim numbers and case references
Claim numbers, case references and matter numbers, replaced with consistent neutral identifiers.
Financial and tax data
Bank account details and sort codes, National Insurance numbers, UTR and VAT numbers, company numbers and sensitive amounts, detected and masked.
Contact details and addresses
Postal addresses, email addresses and phone numbers, pseudonymised while keeping the document readable for legal analysis.
Courts and legal references
Court and tribunal names and references to jurisdictions, understood in their legal context and not only as generic text.
A timestamped protection report
LexPrivacy produces a timestamped PDF protection report that summarises what was masked: a record of the steps you took to protect personal data under UK GDPR.
Why a solicitor should not paste
client files into ChatGPT
Uploading a client document to ChatGPT, Claude or Gemini sends that data to servers outside your control, often outside the UK. That risks waiving privilege and breaching UK GDPR and the SRA Code of Conduct.
Legal professional privilege
Privilege protects confidential communications between lawyer and client. Disclosure to a third party can waive it, and the waiver cannot be undone. ChatGPT and LPP →
The SRA warning notice on AI misuse
The SRA issued a warning notice on the misuse of AI on 17 August 2026. LexPrivacy follows a privacy-by-design approach. SRA AI misuse explained →
LexPrivacy vs server-side pseudonymisation
Some services pseudonymise on their servers, so your data still leaves your premises. LexPrivacy pseudonymises on your own computer before anything is sent. No identifying data ever leaves your machine.
Document formats
supported by LexPrivacy
PDF documents
Native PDFs and scanned PDFs (automatic text recognition). Contracts, judgments, deeds and pleadings.
Word documents (.docx)
Skeleton arguments, witness statements, letters and draft agreements. Formatting is preserved after pseudonymisation.
Excel sheets (.xlsx)
Fee schedules, lists of parties and financial data. Each cell is analysed individually.
Frequently asked questions
about LexPrivacy
LexPrivacy: free, local,
installed in two minutes
Windows and Mac. No account required. Tell us you would like LexPrivacy and we will send you the installer.
Prefer to process your documents without pseudonymisation? See LegisBox Private →