All 28 tools
All 28 LocalFirstTools utilities on one page, grouped into JSON, encoding, generator and text tools. Each one runs entirely in your browser: paste or drop your data, get the result, copy it back. Nothing is uploaded and you don't need an account. Not sure where to start? Try the JSON Formatter, JWT Decoder or Base64.
JSON tools
JSON tools hubJSON Formatter, Validator & Pretty PrintPretty-print, beautify, minify and validate JSON in your browser, 100% client-side.JSON MinifierStrip whitespace from JSON and see the bytes saved.JSON ↔ YAML ConverterConvert JSON to YAML and back for configs and manifests.JSON ↔ CSV ConverterTurn arrays of objects into CSV rows and back again.CSV ViewerOpen a CSV or TSV as a sortable table in your browser, nothing uploaded.JSON Diff & CompareCompare two JSON documents structurally, ignoring key order.JSON ↔ XML ConverterConvert JSON to XML and back, and pretty-print XML.XML Formatter, Validator & Pretty PrintPretty-print, beautify, minify and validate XML in your browser, 100% client-side.JSON → TypeScriptGenerate TypeScript interfaces from a JSON sample.JSONPath TesterQuery JSON with JSONPath and inspect every match.
Encoding tools
Encoding tools hubJWT DecoderInspect header and payload of a JSON Web Token locally.Base64 Encode / Decode: Text, Images & FilesText, images, PDFs and any file to Base64 and back (Base64URL, data URLs and hex) without uploading.URL Encode / DecodePercent-encode query strings, paths and fragments.HTML Entity Encode / DecodeEscape text for HTML and decode entities back to text.Query String ↔ JSONTurn URL query strings into JSON and back.Hex Encode / DecodeConvert text and bytes to hexadecimal and back.HTML Formatter & BeautifierPretty-print or minify HTML in your browser without executing it.
Generators
Generators hubUUID Generator (v4 & v7): GUID GeneratorGenerate UUID v4 or time-ordered v7, up to 1000 at once, as lowercase, uppercase or {braced} GUIDs, with the Web Crypto API.Hash Generator: SHA-256, SHA-512, SHA-1, MD5SHA-256, SHA-512, SHA-384, SHA-1 and MD5 of text or files, checksum verification and HMAC, computed on your device.Password GeneratorRandom passwords via Web Crypto, on your device.
Text tools
Text tools hubCase ConvertercamelCase, snake_case, kebab-case, PascalCase and more.Unix Timestamp Converter & Epoch ConverterEpoch time in seconds, ms, µs or ns to ISO and local dates and back, plus the current Unix time.Regex TesterTest regular expressions with live match highlighting.Diff Checker: Compare Two TextsCompare two texts line by line, word by word or character by character, in your browser.Cron Expression Generator & ExplainerBuild, explain and validate cron expressions with next run times.Slug GeneratorTurn any title into a clean, URL-safe slug.Discord Timestamp GeneratorBuild <t:…> Discord timestamps that show in every reader's local time.SQL Formatter & BeautifierPretty-print or minify SQL in your browser, with dialect and keyword case.