Development & Data
13 toolsFree online development & data tools — all fully client-side, no sign-up required.
JSON Formatter & Validator
Pretty-print, validate, and minify JSON.
JSON formatterJSON validatorpretty print JSON
Diff Checker
Compare two texts side by side.
diff checkertext comparisoncompare text
Regex Tester
Test patterns with live matching.
regex testerregular expression testerregex test
UUID Generator
Generate v4 UUIDs instantly.
UUID generatorgenerate UUIDv4 UUID
Slug Converter
Convert text to URL-friendly slugs.
slug converterURL slugtext to slug
Lorem Ipsum Generator
Generate placeholder text.
lorem ipsum generatordummy textplaceholder text
JSON to Excel Converter
Convert JSON data to XLSX spreadsheets.
JSON to ExcelJSON to XLSXconvert JSON to Excel
CSV to JSON Converter
Convert CSV data to JSON format.
CSV to JSONconvert CSV to JSONCSV JSON converter
Markdown Preview
Live preview of Markdown content.
markdown previewmarkdown editormarkdown to HTML
Acronym Generator
Create acronyms from phrases.
acronym generatorcreate acronymabbreviation generator
Email Link Generator
Generate mailto links with subject and body.
email link generatormailto linkcreate mailto
HTML Entity Encoder/Decoder
Encode or decode HTML entities.
HTML entity encoderHTML entity decoderencode HTML
URL Cleaner – Tracking Remover
Strip tracking params (UTM, fbclid, gclid) from URLs.
URL cleanerremove tracking parametersUTM remover