Developer Tools

Local-first formatting & encoding lab

Tool Search
Found tools: 11
Filter by Function
All Tools JSON Formatting Encoding Lab Time Utilities URL Encoding ID Generators SQL Tools Cron Tools CSS Tools HTML Tools Regex 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.
JSON to CSV Converter - Local Spreadsheet Export

Convert JSON objects or arrays to CSV locally in your browser. Flatten fields, preview the result, then copy or download CSV without uploading data.

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.

Regex Tools

Pattern testing, highlights, and capture groups

Regex Tester - Live JavaScript Regex Debugger

Test JavaScript regex patterns locally with live highlights, flags, match counts, and capture groups. Debug sample text in your browser with no uploads.

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.