How to Blur Place Names, Workplaces, Schools, and Routine Places
When posting anonymously, writing place names, workplaces, schools, and routine places as-is is dangerous.
However, deleting everything is not always the answer. In consultations, personal accounts, whistleblowing, and activity reports, the meaning may not come across if information about place or affiliation is absent.
What matters is keeping the necessary meaning while lowering the granularity so the person and people involved are not narrowed down too far.
Should you write "a company in Tokyo" or "an IT company in the Tokyo metropolitan area"? Should you write "a shop in front of the station" or "a local restaurant"? Differences in granularity greatly change anonymity.
This article organizes how to think when blurring place names, workplaces, schools, and routine places.
The Purpose of Blurring Is Not to Remove Meaning
Blurring does not mean making information vague until it cannot be read.
The blurring needed for anonymity keeps enough context for readers to understand the situation while making the person and people involved harder to identify.
Information
Risk of writing it as-is
Purpose of blurring
Place name
Routine places or movement range become visible
Keep only the regional context
Workplace
Workplace or department narrows
Communicate only the industry or situation
School
Grade, region, and people involved become visible
Communicate only the educational-environment issue
Shop or facility
Range of activity becomes clear
Communicate only the nature of the place
Event
Site participation or people involved become clear
Communicate only the meaning of the event
If you blur too much, readers cannot understand the situation.
If you blur too little, the person and people around them are put at risk. You need to choose granularity that fits the purpose.
How to Blur Place Names
Place names are very strong clues for anonymity.
Prefectures, cities, wards, station names, train lines, shop names, school districts, event venues. The more specific they become, the more candidates narrow.
Writing
Granularity
How it appears for anonymity
Near Shibuya Station
Very specific
Range of activity narrows considerably
Around a major station in Tokyo
Somewhat specific
The urban situation still comes across
Around a station in the Tokyo metropolitan area
Medium
Keeps regional character while blurring
Around a station in an urban area
Abstract
Communicates the situation more than the place
Somewhere with many pedestrians
Nature only
Reveals almost no regional information
How far to blur depends on the purpose of the post.
If regional differences are important to the story, a prefecture or broad region may be necessary. If the place itself is not important, replace it with a category or type of place, such as urban area, rural area, near a station, commercial facility, or near a school.
How to Blur Workplace Information
Workplace information greatly reduces anonymity.
Even without naming the company, the candidates narrow when industry, occupation, department, work location, working pattern, number of employees, title, and products handled overlap.
Specific information
Blurring example
Point to watch
Company name
Company in the same industry
Do not point directly to the company
Department name
Administrative department, development department, field department
In a small organization, even the department alone can be dangerous
Occupation
Office work, technical role, customer-facing work
Blur highly specialized occupations further
Work location
Tokyo metropolitan area, regional city
Avoid station names or building names
Number of people
Small workplace, larger organization
Do not give exact headcounts
In whistleblowing or labor issues, specificity may be necessary in some situations.
Even then, before putting it directly in a public article or social media post, it is safer to consult a trusted place such as a lawyer, labor consultation service, news organization, or support group. There are situations where balancing anonymity and evidentiary value should not be judged alone.
School and Family Information Can Involve People Other Than You
Information about schools, families, and children is not only your own issue.
When school name, grade, club activity, events, teachers, class size, school route, uniform, and photo backgrounds combine, not only the person but also children, classmates, and family members can be narrowed down.
Information
Dangerous writing
How to blur it
School name
Specific school name
A school in the area, the school they attend
Grade
Second year of junior high school, etc.
Junior high school student, high school student
Club activity
Rare club name
School activity, club activity
Event
Date and event name
Recent school event
School route
Station name, road name
On the way to school, nearby
Minors and family members often have not consented to publication.
For anonymity, check not only whether your own identity can be revealed, but also whether people around you can be identified.
Routine Places Become Visible Through Multiple Pieces of Information
Routine places do not become visible from only one place name.
Weather, transit delays, supermarkets, hospitals, stations, events, dialect, trash collection days, local news. When small everyday topics overlap, the place where someone lives becomes visible.
Clue
How it appears on its own
What happens when it overlaps
Transit delay
Possible train lines used
Commute or school area becomes visible
Weather
Broad region
Region narrows when combined with posting time
Shop story
Range of activity
Routine places or nearest area become visible
Local event
Place someone could attend
Local attendance can be inferred
Dialect
Regional character
Connects with age group or place of origin
To protect routine places, deleting place names alone is not enough.
Also check region-specific events, time, photos, and transportation information together.
Practical Steps for Blurring
Before posting, first write out the specific information and then lower its granularity.
Rather than polishing the text immediately, it is safer to break down what can lead to identification.
Step
What to do
Example
1
Extract specific information
Station name, school name, department name, date
2
Decide whether it is necessary to the story
Whether the place is needed or the situation alone is enough
3
Lower the granularity
Change city name to region, station name to around a station
4
Look at combinations
Whether region, occupation, and time overlap
5
Look at the impact on people involved
Whether family, colleagues, or sources are narrowed
After blurring, also check whether the meaning still comes across to readers.
If you remove too much information for anonymity, the topic may become unclear. It is important to keep the necessary context while dropping details that can be used for identification.
Common Blurring Failures
Even if you think you have blurred information, specificity may return through other information.
The place name is deleted, but the station name appears in a photo. The company name is deleted, but a rare department name or product name is written. The school name is blurred, but the event date and uniform reveal it. These failures happen often.
Failure
What happens
How to fix it
Deleting only the place name
Photos or transportation information brings the place back
Also check background, time, and train lines
Deleting only the company name
Work content narrows the workplace
Also lower the granularity of industry and role
Deleting only the school name
Events or uniforms reveal the school
Also blur date, photos, and grade
Leaving the date
It is matched against records
Change to month-level or season-level wording
Leaving traits of people involved
Another person may be identified
Also remove information about people other than you
Blurring is not word replacement.
Check whether specific information comes back when the text, images, dates, replies, and links are viewed together.
Summary
Place names, workplaces, schools, and routine places become strong clues for anonymity.
Even if you do not write a real name, the person and people involved can be narrowed down when station names, industry, school events, family structure, local news, and posting times overlap.
The purpose of blurring is not to remove meaning.
It is to keep the context readers need while lowering the granularity that can be used for identification.
Replace places with their nature, workplaces with industry or role, schools with educational environment, and routine places with broad situations.
For high-risk whistleblowing or consultation, do not try to solve everything through blurring alone; also consider consulting specialists or support organizations.
For anonymity, what matters is not only what you write, but also the granularity at which you write it.
Related tools
OSINT directory
OSINT Framework
An external resource related to this article. Open it only when it fits your situation and threat model.
Why it is listed: It can help with the article topic, but it is outside Anonymity Sense and should be checked before use.