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.

Elysia Tools

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Security

CSV/JSON Data Watermarker

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

Details

What this tool helps you do

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

Execution

Run this tool

Fill in the form, run the tool, and review the result in one place.

Prepared example runs

Click an example to fill the form automatically. File inputs still need an upload.

1 examples

Watermark a CSV export before sending it to an external partner

Inject user, timestamp, and signature fields into the exported dataset so any later leak can be traced back to the recipient batch.

{
  "type": "file",
  "filePath": "/public/samples/csv/watermarked-partner-share-export.csv"
}

Inputs

Set the required fields, then run the tool.

7 options

FilesUpload source files for this workflow.1

Data FilefileOptional

Single file max size: 20 MBSupported types: application/json, text/csv, text/plain, .json, .csv

ContentPaste or type the main input values.4

Data InputtextareaOptionalUsernametextRequiredCustom FieldtextOptionalSecret SalttextOptional

SettingsAdjust formats, ranges, numbers, and modes.2

Input FormatselectOptionalWatermark ModeselectOptional

Result

Ready for a run

Run the tool to preview files, text, structured data, or streamed output here.

Samples

CSV/JSON Data Watermarker

What this tool helps you do

Run this tool

Prepared example runs

Inputs

Result

Examples that match this tool

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Prepared example runs

Inputs

Result

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Watermarking a partner data share

2. Discreetly tracking internal JSON reports

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