Validate and format JSON online: beautify/minify, sort keys, locate errors, decode Unicode/URL, export CSV, and generate TypeScript, Go, Java, C#, Python, Kotlin, Rust, or PHP structures.

Test regular expressions in real time with highlighted matches, capture groups, replacement preview, and a library of common patterns.

All-in-one converter for timestamps, Base64, URL, Unicode, number bases, and SHA hashes.

Generate QR codes with custom size, error-correction level, and colors; export as PNG or SVG.

Measure network speed and latency in the browser with multiple test modes, concurrency, and custom endpoints.

Transfer files directly between two browsers over an encrypted WebRTC connection. No server or install; files stay on your local network.

Generate TOTP two-factor authentication codes with custom secrets, a live countdown, and QR export.

Generate secure passwords and cryptographic keys, plus a JWT tool.

Issue and deploy free SSL certificates automatically.

Parse an APK's package name, icon, public key, and key MD5 for filing and payment integration.

Stream and analyze GB-scale access logs locally: trends, top IPs and regions, URLs, status codes, and crawler detection.

Edit and preview Markdown online, then export it as a PDF.

Compare two texts line by line with side-by-side highlighting; optionally ignore case or whitespace.

Detect hidden characters such as zero-width spaces, control codes, and special spaces, with stats and Unicode lookup.

Convert between Simplified and Traditional Chinese (Taiwan/Hong Kong variants) with OpenCC, locally in your browser.

Compress images and convert between WebP, JPEG, and PNG; resize, adjust quality, crop, and add watermarks locally.

Remove image backgrounds with on-device AI and change ID-photo backgrounds; supports transparent PNG and 1-inch/2-inch sizes.

Pick colors in HEX, RGB, or HSL, with fullscreen mode and a fill-light helper.

Turn photos into bead patterns, or import pattern screenshots and AI pixel art; recognize the grid, restore colors, and count beads.

View EXIF/IPTC/XMP metadata and GPS location, then strip it losslessly before downloading.

Play local audio files with LRC lyrics, karaoke mode, a background slideshow, and QR song requests.

Tune guitars, basses, ukuleles, and violins with microphone calibration, noise reduction, and multiple samples.

Generate calibration tones (sine, sweep, white/pink noise) and view real-time spectra, spectrograms, and waterfall plots.

A precise Web Audio metronome from 30 to 300 BPM with time signatures, subdivisions, tap tempo, and visual beats.

A teleprompter for video recording and live streaming with mirror mode, fullscreen playback, and scroll control.

Track countdowns and days-since for important dates, with yearly anniversaries and holiday templates.

Record device purchase prices and resale/retirement values to calculate the true daily cost and total spend.

An online lucky draw for annual events with image-based draws, custom prizes, and winner lists.

A classic 25/5 Pomodoro timer with focus/short/long breaks, browser notifications, and daily stats.

Convert length, mass, area, volume, speed, time, storage, pressure, and temperature in real time.

Calculate date intervals and business days, add or subtract dates, and get ages and next-birthday countdowns.

Connect to a Picooc smart scale via Web Bluetooth to read weight and impedance in real time; data stays on your device.

Play Game Boy Advance in your browser: single-player, local two-player, and online link battles; ROMs and saves stay on your device.