Data Conversion Data Tools
CSV to JSON Converter
Convert CSV rows into JSON arrays with optional headers.
Format Shift
Open toolPractical tool library
Free Online Tools
Explore browser-based tools for data cleanup, text editing, developer formatting and AI dataset preparation.
Grouped by task Local-first processing Built for practical tasks
Total tools
21
Workflow groups
5
Runs locally
100%
Format Shift
Data Conversion
Move between CSV, JSON, JSONL and Markdown formats without opening a heavy data stack.
Includes CSV to JSON Converter · JSON to CSV Converter · Markdown Table Generator
4 tools
Data Conversion Data Tools
JSON to CSV Converter
Convert JSON arrays into CSV text for spreadsheets or exports.
Format Shift
Open tool Data Conversion Developer Tools
Markdown Table Generator
Create Markdown tables from CSV or row-based input.
Format Shift
Open tool Data Conversion Data Tools
CSV to JSONL Converter
Convert CSV rows into line-delimited JSON records for AI and data workflows.
Format Shift
Open toolCleanup Workflow
Data Cleaning
Trim, normalize, deduplicate and inspect messy files before analysis or model training.
Includes CSV Column Profiler · CSV Cleaner
2 tools
Data Cleaning AI Data Tools
CSV Column Profiler
Analyze CSV columns, missing values, unique counts and guessed types.
Cleanup Workflow
Open tool Data Cleaning Data Tools
CSV Cleaner
Trim cells, normalize headers, drop empty rows and clean duplicate CSV rows.
Cleanup Workflow
Open toolText Productivity
Text & Writing
Clean text, normalize casing and measure writing output for docs, notes and SEO drafts.
Includes Duplicate Line Remover · Text Case Converter · Word Counter
3 tools
Text & Writing Text Tools
Duplicate Line Remover
Remove duplicate lines from text with optional case sensitivity.
Text Productivity
Open tool Text & Writing Text Tools
Text Case Converter
Convert text to lowercase, uppercase, title case, camelCase and more.
Text Productivity
Open tool Text & Writing Text Tools
Word Counter
Count words, characters, sentences, paragraphs and reading time.
Text Productivity
Open toolDev Helpers
Developer Utilities
Format JSON and SQL, test regex patterns, and encode payloads with small browser-based utilities.
Includes JSON Formatter · Base64 Encoder / Decoder · Regex Tester and Extractor
5 tools
Developer Utilities Developer Tools
JSON Formatter
Format, validate and minify JSON directly in your browser.
Dev Helpers
Open tool Developer Utilities Developer Tools
Base64 Encoder / Decoder
Encode plain text to Base64 or decode Base64 back to text.
Dev Helpers
Open tool Developer Utilities Developer Tools
Regex Tester and Extractor
Test JavaScript regex patterns, inspect matches and extract capture groups locally.
Dev Helpers
Open tool Developer Utilities Developer Tools
URL Encoder / Decoder
Encode or decode URL text safely in your browser.
Dev Helpers
Open tool Developer Utilities Developer Tools
SQL Formatter and Minifier
Format SQL queries for readability or minify them by stripping comments and extra spaces.
Dev Helpers
Open toolAI Prep
AI Data Preparation
Prepare prompt datasets, deduplicate JSONL, scan for PII, check leakage and validate training data locally in your browser.
Includes Dataset Splitter · JSONL Validator and Formatter · Prompt Dataset Converter
7 tools
AI Data Preparation AI Data Tools
Dataset Splitter
Split CSV or JSON datasets into train, validation and test sets in your browser.
AI Prep
Open tool AI Data Preparation AI Data Tools
JSONL Validator and Formatter
Validate JSONL files line by line and normalize valid records in your browser.
AI Prep
Open tool AI Data Preparation AI Data Tools
Prompt Dataset Converter
Convert CSV or JSON rows into instruction or chat-style prompt datasets.
AI Prep
Open tool AI Data Preparation AI Data Tools
JSONL Deduplicator
Remove repeated JSONL records by full object or a selected key field.
AI Prep
Open tool AI Data Preparation AI Data Tools
PII Detector for Datasets
Scan CSV, JSON or JSONL datasets for common PII patterns before sharing or training.
AI Prep
Open tool AI Data Preparation AI Data Tools
Training Text Length Analyzer
Inspect prompt, completion or text-field length distributions before batching or training.
AI Prep
Open tool AI Data Preparation AI Data Tools
Train/Test Leakage Checker
Compare train and test datasets for exact overlap before model evaluation.
AI Prep
Open tool