TOOL LIBRARY
Pick a tool.
Keep your data local.
Useful browser tools for calculations, data conversion, and validation. Your inputs stay in your browser.
All reviewed tools
3 browser-local utilities.
CSV to JSON Converter
Convert quoted CSV rows into JSON in your browser without sending file contents to a server.
Open tool →JSON Validator and Formatter
Validate and pretty-print JSON locally, with a clear parsing error when the input is invalid.
Open tool →Percentage Calculator
Calculate a percentage of a value and the resulting total locally in your browser.
Open tool →