Making documents confidential

Why blacking out text in a PDF often fails

A black rectangle covers text but does not remove it. Here is how hidden words come back, what real redaction does, and how to test your own file.

How to redact a PDF properly: a step-by-step guide

Covering a name with a black shape leaves the text in the file. Here are the routes that really remove it, and a short routine to test your PDF before you send it.

Anonymization, pseudonymization, redaction: what is the difference?

Anonymous data leaves the GDPR. Pseudonymized data stays in it, at least for whoever holds the key. Redaction is what you do to the page. Here is how to tell them apart.

Subject access requests: how to redact other people's data

A subject access request gives a person a copy of their own data, not other people's. Here is what to mask, what to leave in, and how to log each decision.

What to mask before you upload a document to an AI assistant

A practical guide to what to mask in a contract, a CV, a medical letter or a log file before an AI assistant reads it, with a table and a checklist.

How ONYRI Sanitize anonymizes a document inside your browser

Your file is read, scanned and masked on your own device. Our server only gets counters and statistics without content. Here is the pipeline, a way to verify it, and the honest limits.

Masking by Hand in ONYRI Sanitize: Select, Draw, Search

Automatic detectors miss signatures, logos, and code names. ONYRI Sanitize's Select, Draw, and Search tools mask them by hand, on every plan, Free included.

How to Redact a PDF Without Adobe Acrobat

Adobe Acrobat is not the only way to redact a PDF. macOS Preview and LibreOffice Draw both remove text for good, if you use them the right way.

How to anonymize a Word document before sharing it

Tracked changes, comments, headers, embedded spreadsheets: a Word file holds more than the page shows. Here is the order to clean it, label names and export safely.

Translating a confidential document: what to mask before you use a translator

Manual redaction vs ONYRI Sanitize: an honest comparison

How ONYRI Sanitize Finds Names and Company Names in a Document

Hidden data in your documents: metadata, comments and tracked changes

Is Pseudonymised Data Still Personal Data Under GDPR?

How to redact a PDF on a Mac, iPhone, or iPad

You sent an unredacted document by mistake: what to do now

Medical Documents in ONYRI Sanitize: What Gets Masked, and What You Mask Yourself

How to Redact a PDF on Windows

Should you hide your signature before sharing a document?

Online PDF Tools: What Happens to the File You Upload?

Lawyers: anonymizing case files and exhibits without losing meaning

Which Numbers in a Document Are Most Dangerous If They Leak?

How to redact a PDF on Android

How to hide faces and license plates in a photo before sharing it

How to Turn a Signed Contract Into a Reusable Template Without Leaking the Client

How to share a copy of your ID card safely

HR: anonymizing CVs, payslips and disciplinary files

Re-identification: why removing names is not enough

Tokenization, Hashing or Encryption: Which One Pseudonymizes?

Using Token Mode Before You Send a Document to an AI Assistant

How accurate is ONYRI Sanitize? Our detection benchmark on 48 fictitious documents

ONYRI Sanitize tutorial: anonymize your first document, step by step

Posting a Document Online to Ask for Advice: What to Mask First

Anonymizing an internship report or thesis: what to hide

How to redact a scanned document or a photo of a page

What Online PDF Tools Say They Do With Your File: We Read 12 Policies

Trade Secrets: What to Mask Before Sharing a Document With a Partner

Which ID Numbers Does ONYRI Sanitize Detect, by Country?

Healthcare: de-identifying medical records for teaching, research or second opinions

Can ChatGPT or Copilot anonymize a document for you?

Anonymisation guidance by country: what European regulators say

Publishing a PDF on your website: what search engines can read in it

Recruiters: sending an anonymous CV to a client without losing the candidate

Black marker or Token mode: which one should you choose?

National ID numbers in documents: the rules country by country

What Does It Mean to Sanitize a Document?

PII vs personal data: what's the difference between US and EU law?

Blur or black box? How to hide text in a screenshot safely

How to test a redaction tool before you trust it

Anonymising documents under UK GDPR: what the ICO's guidance says

ISO 27001 and SOC 2 audits: what to mask in the evidence you hand over

Penetration Test Reports: What to Redact Before You Share One

Sharing a Medical Certificate: What the Recipient May See

Insurance Claims: What to Mask in a Claim File Before Sharing It

GDPR data minimisation, applied to documents

Barcodes and QR codes on documents: what they reveal, and why to mask them

How to anonymize a slide deck before you share it

De-identified data in North America: California, US states and Québec

Anonymising Documents in Switzerland Under the Revised FADP

Company secretaries: sharing board papers without leaking inside information

HIPAA Safe Harbor: the 18 identifiers to remove from a medical document

How to check a redacted document before you send it: a 10-minute routine

DPOs and Compliance Teams: How to Write a Redaction Procedure

How to Anonymize a Filled-In PDF Form (and Why the Answers Can Survive)

Councils and public buyers: what to mask before publishing decisions and tender documents

Property managers: what to mask in owners' meeting minutes and building documents

How to Anonymize a Manuscript for Double-Blind Peer Review

Notaries: anonymizing deeds and estate files before sharing an example

How to redact a Google Docs document before sharing

What counts as personal data in a document? A line-by-line guide

Letterheads, headers and footers: the details that identify a document

Redaction, Encryption or a Password: Which Protects a Document?

Estate agents: what to mask in a property sale file before passing it on

Anonymization glossary: key terms in English, French and German

Engineers and Architects: Sharing Drawings Without Exposing the Client

Due diligence data rooms: what to redact before you upload documents

Accountants and finance teams: anonymizing invoices and bank statements

Charities and associations: what to mask in beneficiary files before sharing them

Genealogy: sharing old civil records without exposing living people

Social workers: how to anonymize a case file for supervision, training or a report

Five document workflows you can run with ONYRI Sanitize

Word Documents in ONYRI Sanitize: What the PDF Export Keeps

Health, religion, union membership: special category data in documents

Sharing a sensitive document safely: a practical checklist

Anonymizing a document in another language: names, dates and numbers that change

How to anonymize meeting minutes before sharing them

Custom rules and profiles: masking what is specific to your company

Mediators: what to mask in case summaries, settlement agreements and annual reports

Clinical trial documents: anonymising reports before publication

Developers: Mask Secrets Before Sharing Logs and Screenshots

The three tests of anonymisation (singling out, linkability, inference), explained

Court experts: what to mask before reusing an expert report outside the case

Public, internal, confidential: how classification decides what to mask

How to anonymize an email thread before forwarding or archiving it

Sending Documents Outside the EU: Should You Anonymize First?

ONYRI Free or Pro: how to choose by document volume

What is document redaction? Definition, uses and limits

Researchers: How to Anonymize Interview Transcripts

Rental applications: what tenants and landlords should mask

Consistent Pseudonyms: How to Replace Names Without Losing Meaning

Freedom of information requests: what to redact before releasing documents

Anonymise or delete? Document retention under the GDPR

Journalists: How to Publish a Document Without Exposing Your Source

Teachers and schools: anonymizing student records and exam papers

Whistleblower reports: how to protect identities in documents

Publishing court decisions and public records: what must be masked

Scanned Documents and OCR in ONYRI Sanitize: How It Works, and Its Limits

Reviewing a document in ONYRI Sanitize before you download it

Why Documents Are Harder to Anonymize Than Databases

Consultants: turn a client deliverable into a shareable sample

What's new in the ONYRI Sanitize document dashboard