Your Data Never Leaves
Your Device.
Privacy-first text tools for cleaning, formatting, and transforming your data — all processed locally in your browser. No servers, no uploads, no tracking.
How It Works
Three simple steps to process your data securely — no uploads, no sign-ups, no worries.
Paste or Upload
Type your text, paste from clipboard, or drag-and-drop a file into any tool. Everything stays on your device.
Process Locally
Click the action button. Your data is processed instantly in your browser's memory using pure JavaScript — no server calls.
Copy & Go
One click copies the result. Close the tab when done — your data is gone. No traces, no logs, no storage.
All Tools
Seven powerful tools for text manipulation, data privacy, and developer productivity — all running entirely in your browser.
Text Cleaner
Remove extra spaces, empty lines, HTML tags, and convert between Traditional and Simplified Chinese instantly.
Data Masking Tool
Mask sensitive information — ID numbers, emails, phone numbers, and IP addresses — with one click.
JSON Formatter
Format, validate, and compress JSON. Smart detection switches between pretty-print and minified views.
Base64 Encoder/Decoder
Encode text or images to Base64, and decode Base64 back to readable text with preview support.
URL Encoder/Decoder
Encode and decode URLs with proper encodeURIComponent/decodeURIComponent handling.
Timestamp Converter
Convert between Unix timestamps (seconds/milliseconds) and human-readable dates in real time.
CSV ↔ JSON Converter
Convert CSV to JSON arrays using the first row as keys. Supports large files and various delimiters.
What Users Say
Real feedback from people who care about their privacy.
I've been using the JSON formatter daily for work. The fact that it runs locally means I can process sensitive API configs without worrying. Huge time saver.
Finally a tool site that doesn't ask for my email or try to sell me something. The data masking tool saved me hours of manual redaction on a client report.
I was skeptical about "privacy-first" claims until I tested these tools with DevTools open. Zero network requests. That's the real deal. Bookmarked.
Why Privacy Matters
Every time you paste sensitive data into an online tool, you're trusting someone else's server. With CleanText.online, that trust is never needed.
Zero Upload
Your data is processed in-memory. Nothing is ever sent to any server.
Blazing Fast
All processing happens instantly. No network latency, no waiting.
Works Offline
Once loaded, most tools work even without an internet connection.
Built With
Modern technology stack that prioritizes performance and privacy.
Latest from the Blog
Tips, guides, and insights on data privacy, text processing, and developer productivity.
The Privacy Risks of Online JSON Validators (And How to Avoid Them)
Most online JSON validators send your data to remote servers. Here's why that matters and how local processing keeps your data safe.
How to Clean Up Messy Excel Data Without Writing Formulas
Learn how to transform messy spreadsheets into clean, usable data using simple text processing techniques.
Is Your Data Safe on Free Online Tools? A 2025 Analysis
We analyzed 50 popular free online tools to understand their data handling practices. The results might surprise you.
Ready to try it?
No sign-ups. No data uploads. No tracking. Just fast, private tools that work in your browser.
Get Started Now →