Developer tools, done right.

38 fast, private tools that run in your browser. No signup. No data leaves your device.

Browse Tools
Instant — no serverPrivate — client-side onlyFree — no account needed

Format & Validate

Clean up, beautify, and validate code

JSON Formatter & Validator

Format, validate, and minify JSON with real-time error detection.

SQL Formatter

Format and beautify SQL queries with keyword uppercasing and indentation.

Markdown Preview

Write Markdown and see live rendered HTML preview side by side.

YAML Formatter & Validator

Format and validate YAML. Detect syntax errors and convert to JSON.

HTML Formatter & Minifier

Format, beautify, and minify HTML. Auto-indent tags and attributes.

CSS Formatter & Minifier

Format and minify CSS. Beautify or compress stylesheets instantly.

Encode & Decode

Transform between formats and encodings

Base64 Encode / Decode

Encode text to Base64 or decode Base64 to text with full UTF-8 support.

URL Encode / Decode

Encode or decode URL components. Handles special characters and Unicode.

JWT Decoder

Decode JSON Web Tokens to inspect header, payload, and expiration.

Image to Base64

Convert images to Base64 data URLs. Supports PNG, JPG, SVG, GIF, WebP.

HTML Entity Encoder / Decoder

Encode special characters to HTML entities and decode them back.

Convert

Convert between types, units, and formats

Timestamp Converter

Convert Unix timestamps to dates and back. Live clock with calendar picker.

JSON ↔ CSV Converter

Convert between JSON arrays and CSV. Handles nested objects and quoted fields.

Text Case Converter

Convert text to UPPERCASE, camelCase, snake_case, kebab-case, and more.

Number Base Converter

Convert between binary, octal, decimal, and hexadecimal instantly.

Color Converter

Convert between HEX, RGB, and HSL color formats with live preview.

Cron Expression Parser

Parse cron expressions into human-readable schedules. See next run times.

JSON ↔ YAML Converter

Convert between JSON and YAML formats instantly. Bidirectional.

XML ↔ JSON Converter

Convert between XML and JSON. Parse attributes and nested elements.

TOML ↔ JSON Converter

Convert between TOML and JSON. Parse config files and data structures.

Byte / Size Converter

Convert between bytes, KB, MB, GB, TB and binary units (KiB, MiB, GiB).

cURL to Fetch Converter

Convert cURL commands to JavaScript fetch() or async/await code.

Chmod / Permission Calculator

Calculate Unix file permissions. Visual, octal, and symbolic modes.

Test & Compare

Test patterns, compare text, reference codes

Regex Tester

Test regular expressions in real time with match highlighting and capture groups.

Text Diff Checker

Compare two texts side by side with highlighted additions and deletions.

Generate

Create hashes, IDs, tokens, and text

Hash Generator

Generate SHA-1, SHA-256, SHA-512 hashes and verify integrity.

Password Generator

Generate strong, cryptographically secure passwords with customizable rules.

UUID Generator

Generate UUID v4 instantly. Bulk generate, copy, and use in your projects.

Lorem Ipsum Generator

Generate placeholder text — paragraphs, sentences, or words. Clean output.

JWT Builder / Generator

Build and sign JWT tokens with custom claims. HS256 in-browser signing.

ASCII Art / Text Banner

Convert text to ASCII art banners. Multiple styles and fonts.

From Escalix Studio

InvoiceGrid — The AR management layer between your invoicing tool and getting paid.

Track invoices, analyze your AR, and chase payments — all in one place.

Try InvoiceGrid