Do you upload list contents to a comparison server?

No. List comparison runs in your browser with the text or files you provide.

What data may still be collected by infrastructure?

Hosting or CDN logs may record basic request details such as URL, timestamp, and user agent, but not the full contents of your lists.

Privacy Policy

Last updated: 2026-04-13

This page explains how ListDiff handles data when you compare lists online. The short version: list comparison runs in your browser, and your list contents are not uploaded to a backend for server-side processing.

What happens during comparison

ListDiff performs set operations (A only, B only, intersection, union, symmetric difference, duplicates) in browser memory using JavaScript. Inputs from paste, .txt import, or .csv import are processed locally on your device.

Because list computation is local, results can change immediately as you adjust options such as case sensitivity, trim behavior, empty-line handling, split delimiters, and CSV import mode.

What is not uploaded

Your list text content is not sent to a ListDiff comparison API.
Your generated result rows are not stored in a server database by default.
Your imported local file bytes are not transmitted for remote parsing.

Hosting, analytics, and logs

Like most websites, the hosting platform or CDN may keep basic request logs (for example: requested URL, timestamp, user agent, and rough location by IP). Those logs are not your list contents—they don’t include the full text you pasted or uploaded for comparison.

If analytics are used, they should stay high-level (page views, button clicks). Your list values should never be sent as analytics data.

Your controls and responsibilities

Use Clear all to reset both lists and settings when you’re done.
Avoid sharing screenshots that contain sensitive rows.
Double-check results before you rely on them for legal, money, or compliance decisions.

Be careful with sensitive data

Use caution with personal identifiers, payroll records, or health-related values.
Prefer masked IDs when a demo is enough.
Never paste passwords, tokens, or private keys into any web tool.

If your company has strict rules

Check with your IT or security team before pasting sensitive lists into any browser tool—including this one.

Read Terms of Use for legal boundaries and Compare Basics for result interpretation details.

Contact

Privacy questions: suggest@listdiff.org.

Privacy quick answers

Do you upload list contents to a compare API?
No. Comparison runs in your browser.

Can infrastructure still log requests?
Yes—basic request details (URL, time, browser) may appear in hosting logs, not your full lists.

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