Fast, private data tools.
No uploads.
Free CSV, JSON, and spreadsheet tools that run entirely in your browser. Your data never leaves your machine.
20 Tools, Zero Uploads
Every tool works offline once loaded. Drop a file or paste data and get instant results.
CSV Tools
View, convert, merge, filter, and clean CSV files
CSV Viewer
View and explore CSV files with sorting, filtering, and column type detection. Handles 100k+ rows.
CSV to JSON
Convert CSV data to a JSON array of objects, with header row and indent options.
CSV to Excel
Convert one or more CSV files to an XLSX workbook. Multiple files become separate sheets.
CSV Merger
Merge multiple CSV files by stacking rows, joining on a key column, or concatenating columns.
CSV Deduplicator
Remove duplicate rows from a CSV. Pick which columns to compare and what to keep.
CSV Column Splitter
Split a column into multiple columns by a delimiter, regex, or fixed width.
CSV Filter & Transform
Build a visual filter pipeline with AND/OR logic, pick columns, sort, and export.
JSON Tools
Format, validate, diff, query, and convert JSON data
JSON Formatter
Format, minify, or validate JSON with configurable indentation and error reporting.
JSON Viewer
Explore JSON as an interactive tree with expand/collapse, path display, and search.
JSON Diff
Compare two JSON documents side by side with structural diff highlighting.
JSON to TypeScript
Infer TypeScript interfaces or type aliases from JSON data.
JSON Schema Validator
Validate a JSON document against a JSON Schema with detailed error messages.
JSON Path Evaluator
Query JSON with JSONPath expressions and see matched values instantly.
JSON to SQL INSERT
Generate SQL INSERT statements from a JSON array. Supports batched and per-row modes.
Format Converters
Convert between CSV, JSON, YAML, XML, Excel, and more
JSON to CSV
Convert a JSON array to CSV with optional nested-object flattening.
Excel to CSV
Convert an XLSX workbook to CSV. Pick a sheet for multi-sheet files.
JSON ↔ YAML
Bidirectional live conversion between JSON and YAML.
JSON ↔ XML
Bidirectional live conversion between JSON and XML.
TSV ↔ CSV
Convert between tab-separated and comma-separated values with proper quoting.
Utilities
Encoding, decoding, and other handy data utilities
Built for Real Data Work
No gimmicks. Just fast tools that handle the file sizes you actually work with.
100% Client-Side
Every parse, transform, and conversion runs in your browser. Your data never touches a server.
Streaming Parser
PapaParse streaming mode handles multi-GB CSV files without loading everything into memory at once.
Handles Huge Files
Virtualized tables render 100k+ rows without freezing. Web Workers keep the UI responsive during heavy parses.
Free, No Sign-Up
Every tool is free to use with no account required. Open the page, drop your file, get results.
Ready to clean some data?
Pick a tool, drop your file, and get results in seconds. No sign-up, no uploads, no waiting.