Explore Online Tool Categories
Browse free online tools organized by task and purpose.
Explore categories
Available tools
Word & Character Counter
Count words, characters, lines and reading time.
Text Case Converter
Change text into uppercase, lowercase, title case and more.
Text Difference Checker
Find differences between two versions of text.
JSON Formatter & Validator
Format, minify and validate JSON in your browser.
JSON Compare Tool
Compare JSON values, objects and arrays.
CSV to JSON Converter
Convert CSV tables into JSON documents.
URL Encoder & Decoder
Encode and decode URL components.
Secure Password Generator
Generate random passwords in your browser.
How these tools work
OpenToolKit focuses on useful browser-based utilities. Individual pages explain what a tool does, how to use it, and its limits. Most current text and data processing happens locally in your browser.
We only list tools that are already available. Additional categories such as advanced image processing are planned, not advertised as functional.
How to choose a tool
Start with the task rather than the file type alone. For example, merge PDF combines complete documents, while split PDF selects specific pages. JSON Formatter validates syntax; JSON Compare identifies changed parsed values. Each tool page includes a realistic example and describes what the output can and cannot preserve.
For step-by-step explanations, see the OpenToolKit guides. We do not promise perfect conversion for encrypted, damaged or complex documents.