Tool collection
Files and data
Inspect, clean, compare and transform CSV, text, Markdown, HTML and file checksums locally. Every tool runs locally, explains its assumptions and produces a result without an account or paid external service.
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Merge CSV Files
Inspect, clean or transform structured information locally without executing pasted content.
Split CSV
Inspect, clean or transform structured information locally without executing pasted content.
Remove CSV Duplicates
Inspect, clean or transform structured information locally without executing pasted content.
Text Difference Checker
Inspect, clean or transform structured information locally without executing pasted content.
Sort and Remove Duplicate Lines
Inspect, clean or transform structured information locally without executing pasted content.
Markdown and HTML Converter
Inspect, clean or transform structured information locally without executing pasted content.
File Checksum Calculator
Inspect, clean or transform structured information locally without executing pasted content.
Folder Tree Generator
Inspect, clean or transform structured information locally without executing pasted content.
HTML Table to CSV
Inspect, clean or transform structured information locally without executing pasted content.
CSV Viewer and Filter
Inspect, clean or transform structured information locally without executing pasted content.
Popular tools
Merge CSV Files
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Merge CSV Files
Related guides
How to clean and verify structured data
How to clean and verify structured data: a practical workflow for entering information, reviewing assumptions and saving a useful result without uploading data.
Read guide02 · Answers
Frequently asked questions
Does this category require an account?+
No. Published tools work without registration.
Is information uploaded?+
No. Inputs and generated results stay in your browser.
Are results definitive?+
No. Review the visible assumptions and use professional advice for legal, tax, medical or financial decisions.