devsimpletools

Free online developer tools: converters, encoders, generators and formatters that run 100% in your browser, with no sign-up and without sending your content to any server.

JSON ↔ YAML — Convert objects between JSON and YAML notation.
CSV ↔ JSON — Turn CSV rows into arrays of JSON objects and back.
Query String ↔ JSON — Turn URL parameters into flat JSON objects.
Number Base Converter — Convert numbers between binary, octal, decimal and hexadecimal.
URL Encoder/Decoder — Encode and decode URL components.
Base64 Encoder/Decoder — Encode and decode text in Base64.
HTML Entity Encoder/Decoder — Escape and unescape HTML entities.
JWT Decoder — Break a JWT into header, payload and signature.
UUID/GUID Generator — Generate v4 unique identifiers.
Password/Token Generator — Generate secure random passwords and tokens.
Hash Generator — Compute MD5, SHA-1, SHA-256 and SHA-512 hashes.
Lorem Ipsum Generator — Generate filler paragraphs, sentences or words.
JSON Formatter/Validator — Validate, format and minify JSON.
SQL Formatter — Apply consistent indentation and casing to SQL queries.
Markdown Previewer — Render Markdown to HTML live.
XML Formatter — Format and validate XML documents.
Case Converter — Convert text between camelCase, snake_case, kebab-case and more.
Text Diff Checker — Compare two texts and highlight line-by-line differences.
Regex Tester — Test regular expressions against sample text.
Slug Generator — Turn titles into URL slugs.
Timestamp Converter — Convert between Unix timestamps and readable dates.
Cron Expression Parser/Explainer — Explain in plain language what a cron expression does.
Color Converter — Convert colours between HEX, RGB and HSL.