Developer Tools

Base64 Encode & Decode

Encode text to Base64 or decode Base64 strings back to plain text. Handles Unicode safely. Runs entirely in your browser — nothing is uploaded.

URL Encode & Decode

Percent-encode strings for safe use in URLs or decode percent-encoded strings back to plain text. Supports full URI and component encoding. Runs in your browser.

HTML Entity Encode & Decode

Escape special HTML characters to entities (&, <, >, ") or decode HTML entities back to plain text. Runs entirely in your browser.

Hash Generator

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text. Uses the browser Web Crypto API. Runs entirely in your browser — nothing is uploaded.

JWT Decoder

Decode and inspect JSON Web Tokens. Paste a JWT to view the header, payload, and expiry status. No signature verification — runs entirely in your browser.

Regex Tester

Test regular expressions against sample text. See all matches highlighted inline with capture groups listed. Supports all JavaScript regex flags. Runs in your browser.

JSONPath Tester

Test JSONPath expressions against JSON data. Paste your JSON, enter a path query, and see all matching values instantly. Uses jsonpath-plus. Runs in your browser.

JSON Schema Validator

Validate JSON data against a JSON Schema (draft-07, 2019-09, 2020-12). See all validation errors with paths. Runs entirely in your browser using ajv.

Cron Expression Builder

Build and validate cron expressions visually. Get a human-readable description of your schedule and preview the next 5 run times. Runs entirely in your browser.

Epoch / Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa. Supports seconds and milliseconds, multiple timezones, and ISO 8601. Runs in your browser.

YAML ↔ JSON Converter

Convert between YAML and JSON text with a direction toggle. Paste either format and switch direction instantly. For file-based conversion use the YAML to JSON file tool. Runs in your browser.

Number Base Converter

Convert numbers between decimal, hexadecimal, binary, and octal instantly. Supports integers up to 53-bit precision. Runs entirely in your browser.

Text Case Converter

Convert text between camelCase, snake_case, PascalCase, kebab-case, SCREAMING_SNAKE_CASE, and Title Case. Runs entirely in your browser.

CSV ↔ JSON Text Converter

Convert between CSV and JSON by pasting text directly — no file upload needed. Toggle direction instantly. For file-based conversion use the CSV to JSON file tool.

Color Converter

Convert colors between HEX, RGB, HSL, and HSV formats instantly. Pick from a color wheel or paste any value. Runs entirely in your browser.

SQL Formatter

Format and beautify messy SQL queries. Supports PostgreSQL, MySQL, SQLite and more. Open the result directly in the SQL Query editor. Runs in your browser.

Markdown Preview

Preview rendered Markdown in real time. Paste Markdown on the left, see the sanitised HTML output on the right instantly. Runs entirely in your browser.

HTML Formatter

Format and beautify messy HTML markup. Supports HTML, CSS, and JavaScript. Adjustable indent size. Runs entirely in your browser — nothing is uploaded.

JSON Diff

Compare two JSON documents and visualise the differences. Added, removed, and modified values are highlighted. Runs entirely in your browser — nothing is uploaded.

Text Diff

Compare two blocks of text and view the differences in unified or side-by-side format. Runs entirely in your browser — nothing is uploaded or stored.