Censor CSV Data
Mask data in a CSV file. Runs entirely in your browser, so your data never leaves your device.
0 chars · 0 lines
Output
The result appears here as you type.
How to use Censor CSV Data
- 1. Paste your CSV. Drop the comma-separated rows into the input pane. You'll choose exactly which columns get masked, leaving the rest of the table untouched.
- 2. Pick the columns and mask character. Enter column numbers or names in Columns to censor, leaving it empty to mask every column, and set the Mask character used to replace each value's characters.
- 3. Confirm the header row. Leave First row is header (kept as is) checked so column names remain readable while the values beneath the chosen columns get blacked out.
- 4. Copy the censored CSV. Copy the result with the sensitive columns replaced by the mask character, and share or store it wherever the original values shouldn't be visible.
When to use Censor CSV Data
Censor CSV Data masks the values in specific columns of a CSV file with a repeated character, blacking out fields like salary or a national ID while keeping the rest of the row visible. Censor CSV Data is for redacting select information, not obscuring the whole table.
- Redacting salary before a company-wide share. You need to circulate a headcount spreadsheet company-wide, but salary figures are confidential. Masking just that column keeps names and roles visible while blacking out the sensitive numbers.
- Hiding an ID column in a support export. A support ticket includes a CSV export that shouldn't reveal internal account IDs to an outside vendor. Masking that one column keeps the rest of the context intact.
- Preparing a screenshot-safe data sample. You want to include a table screenshot in a public presentation but need to hide a phone number column first. Masking it before generating the screenshot keeps things safe.
Examples
Black out the salary column
Input
name,salary Ada,90000
Output
name,salary Ada,█████
About the Censor CSV Data tool
Censor CSV Data is a free online tool that works entirely inside your web browser. Mask data in a CSV file. Because the processing happens on your own device, nothing you enter is uploaded, logged or stored anywhere.
This page is one of 133 CSV utilities on EditSafely. Each one does a single job well, and all of them follow the same rule: your input stays on your machine.
You can shape the output with 3 settings, including Columns to censor (numbers or names, empty = all), Mask character and First row is header (kept as is), and the result refreshes the moment you change one. A worked example further down the page shows exactly what the tool produces for a real input.
Because nothing leaves your device, the tool is suitable for sensitive content such as internal documents, credentials or customer data. It also responds instantly, since every keystroke is handled on your own machine rather than by a remote API.
Frequently asked questions
Is Censor CSV Data free to use?
Yes, it is completely free. All 2,658 tools on EditSafely work without an account, a subscription or usage limits.
Is it safe to paste sensitive or confidential data?
Everything happens locally. Your browser downloads the tool's code once, then does all the processing itself; nothing you enter is transmitted, stored or logged. You can even go offline after the page loads and it will still work.
How much text can I process at once?
There is no fixed limit. Because the work happens on your own device rather than on a shared server, the practical ceiling is your machine's memory, which comfortably handles inputs far larger than typical online tools allow.
Do I need to sign up or install anything?
No. The tool works in any modern browser on desktop, tablet or phone. There is no account to create, no extension to add and no software to install.
How do I use the result?
The output panel has a one-click copy button, and you can keep refining the input while you work; the result updates in place as you type.