CSV tools that never see
your data
Dedupe, split and convert payroll exports, customer lists and client files entirely on your own device — with privacy enforced by the browser itself, not promised in a policy.
Every tool private by architecture
Most online converters ask you to hand over your files to a stranger's server. These don't — and that difference is enforced by the browser itself.
Clean & transform
4 tools · more shipping weeklyRemove Duplicate Rows
Dedupe by all columns or by a key column like email/ID. Keep first or last occurrence.
Split CSV
By row count for upload limits, or one file per value of any column. ZIP download.
CSV → JSON
Arrays of objects with header keys. RFC 4180-safe quoted fields.
JSON → CSV
Objects or arrays to clean CSV. Leading zeros survive.
On the roadmap
next upJoin / Merge CSVs
SoonSQL-style joins by key column
Excel ↔ CSV
Soon.xlsx round-trips without corruption
Anonymize Columns
SoonReplace PII with realistic fake data
Three steps, zero uploads
Choose your file
Drop or browse. The file is opened by your own browser — watch the Network tab stay empty.
Configure options
Pick columns, modes and formats. Everything updates instantly, right in the tab.
Download locally
The result is generated in your device's memory and saved straight to your disk.
Don't take our word for it.
Take your DevTools' word.
Privacy policies are promises. Architecture is proof. Every NoCloudCSV page ships a strict Content-Security-Policy that makes outbound requests impossible — not discouraged, impossible.
Network blocked at the source
The site enforces connect-src 'none'. Even malicious injected code could not phone home from this page.
Passes the airplane test
Load once, switch to airplane mode, run every tool. The service worker serves everything locally.
GDPR-friendly by design
No transfer to a server means no data-processing agreement, no retention window, no breach exposure.
Typical online converter vs NoCloudCSV
| Typical upload tool | NoCloudCSV | |
|---|---|---|
| Where files are processed | Remote server you don't control | Your own device |
| Retention of your data | Hours–days (varies by policy) | Nothing exists outside your RAM |
| Signup required | Often, for larger files | Never |
| Free-tier size limit | Commonly 1 MB – 1 GB | Device memory only |
| GDPR posture | You become a data exporter | No transfer occurs |
| Works offline | Impossible | Yes, after first visit |
Questions, answered honestly
Are NoCloudCSV tools really free?
Yes — every tool is free with no account and no daily-use counters. There are no '5 MB free' paywalls; the only limit is your device's memory.
How can I verify that my files are never uploaded?
Three ways: open DevTools → Network while you work (zero requests), disconnect your internet after loading the page (tools keep working), or read our privacy architecture explainer which shows the exact Content-Security-Policy header that blocks all outgoing connections.
Is it safe to process customer or payroll data here?
It is safer than upload-based tools precisely because nothing is processed anywhere except your own machine. Under GDPR there is no transfer to a processor at all, so no data-processing agreement is triggered.
What file formats can I use?
Standard comma- or semicolon-separated CSV, TSV, and JSON for conversions. Quoted fields containing commas, quotes and line breaks are handled per RFC 4180.
Do you use cookies or analytics?
No cookies, no analytics, no tracking pixels — ever. That is not a policy promise, it is enforced in code via Content-Security-Policy.
Does it work offline?
Yes. After your first visit, the service worker caches the entire site so every tool works fully offline — perfect for sensitive files on restricted networks.
Your files deserve better than an upload form
Open a tool, drop a file, get results — all before anything leaves your machine.