# CSV/JSON Data Watermarker

Inject visible or signature-style watermark fields into CSV or JSON exports so shared datasets can be traced later

> Canonical page: https://elysiatools.com/en/tools/csv-json-data-watermarker

- **Category:** Security

- **Keywords:** csv, json, watermark, data sharing, traceability, security

## Overview

Paste CSV/JSON content or upload a file, then add identity metadata such as username, timestamp, and a custom field. The tool writes that information back into the exported dataset so downstream leaks can be traced more easily.

How it works:
- Visible mode injects readable watermark columns/fields
- Invisible mode injects compact signature fields that are less obvious but still attributable
- Username and timestamp are always included
- Custom Field can carry ticket ID, department, project code, or recipient name
- Secret Salt helps derive a more stable signature per export

## Inputs

- **Data Input** (textarea): id,email 1,alice@example.com 2,bob@example.com
- **Data File** (file)
- **Input Format** (select)
- **Watermark Mode** (select)
- **Username** (text): analyst-team-a
- **Custom Field** (text): project-2026-q2
- **Secret Salt** (text): optional-team-salt

## When to use

- Sharing sensitive datasets with external partners or vendors and needing a reliable way to trace potential leaks.
- Distributing internal reports to different departments while maintaining strict accountability for data handling.
- Exporting database records for offline analysis where origin tracking is required for compliance and security audits.

## How it works

- Paste your raw CSV/JSON data or upload a file directly into the tool.
- Specify the required username and an optional custom field, such as a ticket ID or project code.
- Choose between a visible watermark for clear attribution or an invisible signature for discreet tracking.
- Download the processed file containing the injected metadata, secured with your optional secret salt.

## Use cases

- Data analysts sharing customer segments with marketing agencies.
- Security teams tracking the distribution of confidential financial reports.
- Software developers exporting production database dumps for local debugging.

## Frequently asked questions

### What is the difference between visible and invisible modes?

Visible mode adds readable columns or fields, such as the username and timestamp, directly to your data. Invisible mode injects compact, hashed signature fields that are less obvious but can still be traced back to the source.

### What file formats are supported?

The tool supports plain text CSV and JSON formats. You can either paste the raw text into the input field or upload .csv and .json files up to 20MB.

### What is the Secret Salt used for?

The secret salt is a cryptographic string used to generate a stable, unique signature for your export. It makes it significantly harder for unauthorized users to forge or tamper with the invisible watermark.

### What kind of information can I put in the Custom Field?

The Custom Field is flexible and can be used to carry any contextual metadata, such as a Jira ticket ID, department name, project code, or the specific recipient's name.

### Will the watermark break my JSON structure?

No, the tool safely injects the watermark as new key-value pairs within your JSON objects, ensuring the overall file remains valid and parsable.

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## Samples

- [CSV Samples](https://elysiatools.com/en/samples/csv-samples): Sample CSV files with various data types, sizes, and complexity levels
- [Python Samples](https://elysiatools.com/en/samples/python): Essential Python code examples and Hello World demonstrations
- [Chat Transcript JSON Samples](https://elysiatools.com/en/samples/chat-transcript-json): JSON examples for multi-role chat transcripts
- [Rich Media JSON Samples](https://elysiatools.com/en/samples/rich-media-json): JSON examples for popular rich text editors (TipTap, Quill, Slate)

## Related content

- [JSON Utility, Inspection, and Transformation Tools](https://elysiatools.com/en/hubs/json-utility): Format, inspect, compare, merge, transform, validate, analyze, and watermark JSON payloads for API and data workflows.