Free private developer tools
JSON formatter, Base64 encode/decode, JWT decoder, SQL formatter, and more utilities for developers.
Format JSON, encode or decode Base64, and inspect JWT claims — all without sending data anywhere. Every tool runs locally in your browser.
JSON Formatter
Format, beautify, or minify JSON in your browser. Validate and pretty-print instantly — no upload, free online JSON formatter.
devBase64 Encode & Decode
Encode text or files to Base64 and decode Base64 back — privately in your browser. Free online Base64 converter, no upload.
devJWT Decoder
Decode JWT header and payload in your browser. Inspect claims instantly — decode only, no upload, free online JWT decoder.
devQR Code Generator
Create QR codes from text or URLs in your browser. Download PNG instantly — no upload, free online QR code generator.
devPassword Generator
Generate strong random passwords in your browser. Customize length and character sets — no upload, free online password generator.
devUUID Generator
Generate UUID v4 identifiers in your browser. Copy one or bulk UUIDs instantly — no upload, free online UUID generator.
devHash Generator
Compute SHA-256, SHA-1, and MD5 hashes from text or files in your browser. Free online hash generator — no upload.
devURL Encode & Decode
URL-encode or decode strings in your browser. Fix query parameters and percent-encoding — no upload, free online URL encoder.
devDiff Checker
Compare two text blocks side by side in your browser. Highlight additions and deletions — no upload, free online diff checker.
devWord Counter
Count words, characters, sentences, and paragraphs in your browser. Live stats as you type — no upload, free online word counter.
devCase Converter
Convert text between camelCase, snake_case, kebab-case, and more in your browser. Free online case converter — no upload.
devTimestamp Converter
Convert Unix timestamps to human-readable dates and back in your browser. UTC and local time — no upload, free online timestamp converter.
devRegex Tester
Test regular expressions in your browser. Live match highlighting, capture groups, and flags — free online regex tester, no upload.
devColor Converter
Convert hex, RGB, and HSL colors in your browser. Live swatch and copy buttons — free online color converter, no upload.
devMarkdown Preview
Preview Markdown as HTML in your browser. Live side-by-side preview and copy HTML — free online Markdown viewer, no upload.
devSQL Formatter
Format, beautify, or minify SQL in your browser. Dialect support for PostgreSQL, MySQL, SQLite, and T-SQL — no upload, free online SQL formatter.