Text cleaning tools that never upload your text
10 focused tools for cleaning, converting and inspecting text. Everything runs inside your browser, so your data never reaches a server — and nothing breaks when you are offline.
All tools
- Remove Duplicate Lines Strip repeated lines from a list while keeping the original order.
- Remove Extra Spaces Collapse double spaces, trailing whitespace and empty lines.
- List to JSON Array Turn one-item-per-line lists into a valid JSON array.
- Case Converter Switch between UPPER, lower, Title, camelCase, snake_case and more.
- Sort Lines Sort A–Z, by length, reverse or shuffle. Numbering included.
- Tabs to Spaces Convert indentation between tabs and spaces, tab stops respected.
- Base64 Encode / Decode Encode and decode Base64 with correct UTF-8 handling.
- URL Encode / Decode Percent-encode text for query strings, or decode it back.
- Remove HTML Tags Strip tags to plain text, or escape and unescape HTML entities.
- Word & Character Counter Count words, characters, lines, sentences and reading time.
Why these tools work differently
Most online text utilities send whatever you paste to a server, process it there, and send the result back. That is invisible from the interface, and for a shopping list it does not matter. For a customer export, a configuration file or an authentication token, it matters a great deal.
DevClean ships the processing code to your browser instead and runs it locally. Your text is never transmitted, which removes the privacy question entirely and has a pleasant side effect: results are instant, because there is no network round trip and no server waking up from sleep.
You do not have to take that on trust. Open your browser's developer tools, switch to the Network tab, and run any tool on this site — no request appears. Or load a page, disconnect from the internet, and keep working.
Guides
Longer pieces on the problems these tools exist to solve.
- Cleaning Messy Text Data Before You Import It The right order of operations for cleaning an export, and why sequence matters.
- Five Ways to Remove Duplicate Lines, and When to Use Each Spreadsheet, command line, SQL or browser — a comparison of the real options.
- JSON Arrays in Practice: Escaping, Types and Common Mistakes Why hand-written JSON breaks, and how to read a parse error properly.
- Why It Matters That a Text Tool Runs in Your Browser What happens to text you paste online, and how to check for yourself.
Frequently asked questions
Is DevClean free?
Yes, every tool is free and there is no account to create. The site is supported by advertising.
Is my data stored or sent anywhere?
No. All processing happens in your browser using JavaScript. Your text is never transmitted to any server, and nothing is stored beyond your current tab.
How much text can I process at once?
Up to 200,000 characters per run, which is roughly 30,000 words or 20,000 list items. For larger files, split the input or use the command-line alternatives described in the guides.
Do the tools work offline?
Yes. Once a page has loaded, it keeps working with no connection, because there is nothing to fetch.
Is there an API?
Yes — a small HTTP API is available for automating these operations in scripts and pipelines. See the API page.