A curated collection of fast, free, and privacy-first developer tools. Format JSON, convert timestamps, encode Base64, generate QR codes, and more.
Click any tool to get started instantly — no login required.
Format, validate, and minify JSON with real-time syntax checking and error highlighting.
Convert Unix timestamps to human-readable dates and back, across multiple timezones.
Encode text or files to Base64 and decode Base64 strings. Supports URL-safe and MIME formats.
Create custom QR codes for URLs, WiFi, contacts, and text. Download as PNG or SVG.
Encode special characters for URLs using percent-encoding and decode them back.
Generate cryptographically secure random passwords with custom length and character sets.
Paste your HTML source to get an SEO score, keyword analysis, and actionable optimization tips.
Compress JPG, PNG, and WebP images locally in your browser. No upload to servers.
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or any file.
Generate UUID v4 (random) and v7 (timestamp-sortable) identifiers, single or in bulk.
Convert colors between HEX, RGB, HSL, and RGBA formats with a visual picker.
Write Markdown and see the rendered HTML output in real-time. Export as HTML.
Validate JSON data against JSON Schema in real-time with error highlighting and schema generation.
Compare multiple world timezones with a live clock, 24-hour timeline, and meeting time planner.
Create stunning linear, radial, and conic gradients with live preview and multi-language code export.
Test regular expressions with real-time highlighting, match groups, replace/split, and code generation.