Developer Tools

Local-first formatting & encoding lab

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Found tools: 9

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All Tools JSON Formatting Encoding Lab Time Utilities URL Encoding ID Generators SQL Tools Cron Tools CSS Tools HTML Tools

JSON Formatting

Validate, prettify, and emit types

Secure JSON Formatter & Type Generator - Local Type Gen

Secure JSON formatter: format, validate, and fix JSON locally. Beautify/minify, highlight errors, generate TypeScript or Zod, convert to XML—private. Try now.

Encoding Lab

Base64 workers, drag & drop, CSS copy

Base64 Image Encoder & Decoder - Data URL + CSS Generator

Base64 image encoder/decoder: convert files to Data URLs, decode strings back to downloads, and copy CSS background code—WebP-ready, local & private. Try it.

Time Utilities

Unix conversion + relative timeline

Unix Timestamp Converter - Multi-Timezone Epoch to Date

Unix timestamp converter online with seconds/millis auto-detect. View ISO 8601, RFC 2822, UTC, and relative time across timezones—local & private. Try now.

URL Encoding

Bulk encode/decode with diff overlay

Bulk URL Encoder & Decoder - Fix Mojibake with Charset Detect

Encode or decode URLs in bulk, line by line. Detect UTF-8 vs GBK to fix mojibake, preview diffs, and copy curl snippets fast and securely in-browser—offline.

ID Generators

Bulk UUID v4/v7 generation

UUID Generator (v7 Time-Sorted & v4) - 10k+ IDs, No Clash

Generate UUID v7 (time-sorted) and v4 instantly. 100% local, no uploads. Bulk-create 10,000+ IDs in custom SQL/JSON formats, then copy or download. Try now.

SQL Tools

SQL formatting, beautifying, and minifying

SQL Formatter & Minifier - Multi-Dialect, Local & Secure

Format and minify SQL locally—no uploads. Supports MySQL, PostgreSQL, Snowflake, and Spark SQL with smart indentation plus one-line minify. Format now.

Cron Tools

Visual Cron expression builder & explainer

Visual Cron Expression Generator - Crontab Next Runs Preview

Create Cron expressions visually and preview next runs. Local-only privacy—no uploads. Explain */5 in plain English and copy crontab strings. Try now.

CSS Tools

CSS minifying and beautifying

CSS Minifier & Beautifier - Stats, Safe Compression, Local

Minify or beautify CSS locally—no uploads. Remove comments/whitespace, view size savings stats, or unminify code for readability. Copy the result now.

HTML Tools

HTML entity encoding and decoding

HTML Entity Encoder/Decoder - XSS Protection & Live Convert

Encode/decode HTML entities for XSS protection. Local-only privacy—no uploads. Choose unsafe-only or all-chars modes with live conversion and copy. Try now.

Technical Overview & Guide

Zero-upload developer utilities for JSON, timestamps, Base64, and URL payloads. Everything runs in your browser with modern UI focused on DX and compliance.