Every Tool You Need
To Prepare Data for AI
Convert, clean, validate and structure your data with a focused collection of online utilities built for LLMs, RAG systems, datasets and everyday AI development.
No registration required · Free to use · Browser-friendly
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Search the full collection or filter by task category.
HTML to Markdown
Convert HTML content into clean, readable Markdown for LLMs, documentation and knowledge bases.
Open Tool → ConversionURL to Markdown
Extract readable web page content and convert it into Markdown for research and AI workflows.
Open Tool → JSON & JSONLJSON Formatter
Format, beautify and organize JSON data with a clean structure that is easier to inspect.
Open Tool → JSON & JSONLJSON Validator
Validate JSON syntax and quickly identify formatting errors before data enters your pipeline.
Open Tool → JSON & JSONLJSONL Viewer
Open JSON Lines files in a readable format and inspect records one at a time.
Open Tool → JSON & JSONLJSONL Validator
Check JSONL datasets for invalid records, malformed lines and common structural issues.
Open Tool → ConversionCSV to JSONL
Convert CSV datasets into JSONL format for AI training, fine-tuning and data processing.
Open Tool → RAGMarkdown Chunker
Split Markdown documents into smaller, meaningful chunks for RAG and semantic search.
Open Tool → LLMLLM Token Counter
Count exact OpenAI tokens, estimate other model counts and calculate API input costs.
Open Tool →No matching tools found
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Explore by Category
Find the right utility for every stage of your AI data workflow.
Built for Practical AI Workflows
Simple interfaces for common data preparation tasks.
Start Without Setup
Open a tool, paste your data and get useful output immediately. There is no account, installation or complicated configuration.
Made for AI Data
Each utility targets a specific format or workflow, from JSONL datasets to Markdown documents and LLM prompt budgets.
Clear Inputs and Outputs
Clean interfaces, readable results and validation feedback help you understand your data before moving it into production.
Frequently Asked Questions
Are all of these tools free?
Yes. The tools are free to use online and do not require account registration.
Can I filter tools by workflow?
Yes. Use the category buttons to show conversion, JSON and JSONL, RAG or LLM tools, then combine the filter with the search field.
Which tools are useful for RAG?
HTML to Markdown, URL to Markdown and Markdown Chunker are useful for turning source content into clean, retrievable document chunks.
Which tools are useful for datasets?
JSON Validator, JSONL Viewer, JSONL Validator and CSV to JSONL help you inspect, validate and convert structured training data.