Free developer tools that run in your browser
No signup, no uploads, no tracking of your data. Every tool computes locally — your data never leaves your device.
JSON Formatter & Validator
Pretty-print, minify and validate JSON with precise error locations.
JSON to CSV Converter
Convert JSON arrays to CSV, ready for Excel or Google Sheets.
JSON to TypeScript
Generate TypeScript interfaces from any JSON sample.
JSON to XML Converter
Convert JSON objects and arrays to clean, readable XML.
JSON to YAML Converter
Convert JSON to YAML for configs, Kubernetes and CI pipelines.
XML to JSON Converter
Convert XML documents to JSON, with attributes and arrays preserved.
JSON Escape / Unescape
Escape text into a JSON string literal and back, plus URL encoding.
JSON Flatten / Unflatten
Flatten nested JSON to dot notation and reconstruct it.
JSON Key Sorter
Sort JSON object keys alphabetically, recursively.
SQL Formatter
Beautify SQL for MySQL, PostgreSQL, SQLite, T-SQL, PL/SQL and more.
CSS Formatter & Minifier
Beautify stylesheets for reading, minify them for shipping.
XML Formatter & Minifier
Re-indent messy XML or strip it down for transport.
URL & Query String Parser
Break a URL into protocol, host, path and parameters.
HTTP Header Formatter
Convert raw HTTP headers to JSON and back.
Cookie Parser & Formatter
Parse cookie strings into structured JSON with attributes.
Base64 Encode / Decode
UTF-8 safe Base64 with URL-safe variant support.
Hash Generator
MD5, SHA-1, SHA-256, SHA-384, SHA-512 and CRC32 at once.
JWT Decoder
Decode JWT header and payload, check expiry locally.
UUID Generator
Bulk-generate cryptographically random UUID v4.
Password Generator
Strong random passwords with charset control.
AES-256 Encrypt / Decrypt
Password-based AES-GCM encryption, fully in-browser.
Encode / Decode
Escape or unescape HTML special characters.
Unicode Converter
Convert text to \uXXXX escapes and back.
Cron Expression Generator
Build, validate and decode cron expressions with next-run preview.
Image Compressor
Compress and resize PNG, JPG and WebP images — 100% in your browser.
More tools coming soon
PDF tools, HEIC conversion, encoding utilities and more.
Why local-first tools?
Most online tools upload your data to a server before returning a result. BasaltKit tools run entirely in your browser: faster responses, works offline, and sensitive data — API keys, customer records, private images — never leaves your device.