Most browser tools send your data to a server. These don't.
Browser-based utility tools for developers, hardware diagnostics, and security work.
Everything runs client-side. No uploads, no accounts.
Official Website · Blog · Changelog
| Tool | Description | Release date |
|---|---|---|
| Webcam A/V Sync & Latency Meter | Millisecond offset between webcam and microphone, OBS-ready output | 2026-05-20 |
| Gamepad & Joystick Drift Tester | Analog stick drift, dead zone visualization, button diagnostics | 2026-04-30 |
| Web MIDI Keyboard & Latency Tester | Dead keys, ghost notes, and USB-to-browser MIDI input latency | 2026-04-24 |
| Input Lag & Mouse Polling Rate Tester | Browser input latency and mouse polling rate via PointerEvent API | 2026-04-24 |
| Webcam Lighting & Framing Analyzer | Lighting balance, face framing, and resolution diagnostics | 2026-04-22 |
| Dead Pixel & Flicker Test Suite | Backlight bleed, motion ghosting, and color banding checks, fullscreen test modes | 2026-04-21 |
| Live Signal Debugger (coming) | Real-time USB/Serial/Bluetooth signals from Arduino, sensors, MIDI controllers | 2026-11* |
| WebUSB Hardware Flasher (coming) | Flash firmware to ESP32, Arduino, and Raspberry Pi Pico in-browser | 2026-11* |
| Tool | Description | Release date |
|---|---|---|
| JSON Formatter, Validator & Tree Viewer | Pretty-print, minify, and browse JSON in a collapsible tree with syntax highlighting | 2026-07-10 |
| Regex Tester & Match Debugger | Live match highlighting, capture groups, and step-through debugging | 2026-07-10 |
| UUID v1, v4 & v7 Generator | Five display formats, cryptographically random, 100% local | 2026-06-28 |
| Hash Generator | MD5, SHA-1, SHA-256, SHA-512, and HMAC computation | 2026-05-20 |
| Big Log Explorer | Filter, search, and graph 500 MB+ log and JSONL files via Web Workers and IndexedDB | 2026-05-19 |
| Prompt Token Counter | Token count and context window usage for GPT-5.6, Claude Opus 5, Gemini 3.6, Kimi K3, and 33+ more models, with live daily pricing | 2026-05-19 |
| SQL Data Workbench | Query local files with SQL: Parquet, Arrow, Feather, Avro, DBF, Excel, CSV, JSON | 2026-05-15 |
| Base64 Text & File Encoder/Decoder | Converts between raw data and Base64 entirely client-side, nothing uploaded | 2026-05-06 |
| Cron Expression Parser & Next-Run Preview | Translate cron syntax into plain English, see upcoming run times at a glance | 2026-04-25 |
| JWT Decoder & Claims Inspector | Decode header and payload, check expiry and claims | 2026-04-24 |
| Text / Code Diff Viewer (coming) | Side-by-side and unified diff with line-level highlighting | 2026-10* |
| Binary Package Differ (coming) | Diff two ZIP archives or build artifacts: file tree, size delta, byte-level changes | 2026-10* |
| WASM Binary Inspector (coming) | Decompile WebAssembly to WAT, memory map, exports and imports | 2026-10* |
| Tool | Description | Release date |
|---|---|---|
| Password Entropy Analyser | Shannon entropy, zxcvbn pattern analysis, and GPU crack-time estimates | 2026-06-09 |
| URL Encoder / Decoder | Percent-encode and decode URLs and query strings with component parsing | 2026-06-06 |
| Cloud Config Sanitizer | Validate Kubernetes, Terraform, and YAML manifests, detect secrets and security smells | 2026-05-19 |
| X.509 Certificate Inspector | Validity, SANs, key algorithm, chain depth, and expiry from PEM or DER input | 2026-05-19 |
| Offline OCR & Document Redactor | Extract text and redact sensitive regions via Tesseract WASM | 2026-05-13 |
| PII Scrubber | Detect and tokenize PII, secrets, and internal data before sending to AI | 2026-05-08 |
| Browser Fingerprint & Privacy Leak Inspector | Canvas hash, WebGL renderer, audio fingerprint, fonts, and 30+ leak signals | 2026-05-04 |
| EXIF & Image Metadata Scrubber | Strip GPS coordinates, timestamps, and device data from images | 2026-04-23 |
| File Hash Verifier | SHA-256, SHA-512, SHA-1, and MD5 checksums compared against a published hash | 2026-04-23 |
| Quantum-Safe Encryptor (coming) | Post-quantum encryption and decryption via Kyber/Dilithium WASM | 2026-10* |
| Build Integrity Verifier (coming) | SHA-256 and BLAKE3 artifact comparison with functional content diff | 2026-10* |
| Local Secret Scanner (coming) | Scan code, configs, and ZIP archives for API keys, tokens, and credentials | 2026-10* |
| Tool | Description | Release date |
|---|---|---|
| Decibel & SPL Cross-Domain Calculator | Convert between dB, watts, volts, and sound pressure level, with formula reference | 2026-05-08 |
| Speaker Frequency Sweep & Resonance Tester | 20 Hz to 20 kHz sweep to find resonances, rattle points, and drop-off frequencies | 2026-04-24 |
| Microphone Quality, Noise & Latency Tester | Noise floor, clipping, frequency response, echo loopback, and round-trip latency | 2026-04-22 |
| Tool | Description | Release date |
|---|---|---|
| Aspect Ratio & Letterbox Calculator | Display resolutions and scaling for any ratio, with letterbox bars calculated automatically | 2026-05-07 |
| Ohm's Law & Power Calculator | Enter any two of voltage, current, resistance, or power, solve for the rest instantly | 2026-05-07 |
| Electrical Unit Converter | Charge, current, voltage, resistance, capacitance, inductance, and more, converted with SI precision | 2026-05-02 |
| Engineering Unit Converter | SI, imperial, and domain-specific units spanning length, mass, temperature, pressure, energy, and more | 2026-05-02 |
| Resistor Color Code Calculator | 4-band, 5-band, and 6-band decoding with tolerance, temperature coefficient, E-series | 2026-04-24 |
| Tool | Description | Release date |
|---|---|---|
| Offline & Private AI Text Detector | Score how AI-generated your writing reads, fully offline and private in your browser, with no signup and no paywall. | 2026-08-17 |
| Text Case Format Converter | camelCase, snake_case, SCREAMING_SNAKE, kebab-case, Title Case, PascalCase | 2026-05-07 |
| Flesch-Kincaid & SMOG Readability Scorer | Sentence-level highlights show exactly which lines drag your grade level down | 2026-04-27 |
| Reading Time Calculator (coming) | Reading time estimate at adjustable WPM targets | 2026-10* |
| Markdown Preview (coming) | Live-render Markdown with clean typeset output and copy-as-HTML export | 2026-10* |
| Tool | Description | Release date |
|---|---|---|
| WCAG Contrast Checker | AA and AAA contrast ratio testing with hex, RGB, and HSL input | 2026-07-10 |
| CSS Gradient Builder | Visual linear, radial, and conic gradient editor with live CSS output | 2026-06-07 |
| Color Format Converter | Convert between HEX, RGB, HSL, HSV, OKLCH, and CSS named colours | 2026-05-01 |
| Tool | Description | Release date |
|---|---|---|
| MIME Type Reference | Searchable MIME database with extension mapping and RFC sources | 2026-05-31 |
| IndexNow URL Submitter | Submit URLs to Bing, Yandex, Naver, and more via IndexNow | 2026-05-23 |
| HTTP Status Code Reference | Searchable reference for all HTTP 1xx to 5xx codes with usage notes | 2026-05-20 |
| P2P Network Tester | WebRTC peer-to-peer latency, jitter, and packet loss between two browsers | 2026-05-13 |
| IPv4 / IPv6 Subnet & CIDR Calculator | Network ranges, broadcast addresses, and host counts for IPv4 and IPv6 | 2026-05-06 |
| URL Parser & Inspector | Decompose any URL into protocol, host, path, query params, and fragment | 2026-05-03 |
* Planned release
- Debugging API Responses Locally in the Browser: A JSON Formatter Workflow That Never Sends Your Payload - A three-minute local debugging routine for API responses: format, validate, locate the broken line, browse large payloads as a tree, and minify.
- Running an LLM in Your Browser: Verifying WebGPU, Model Hashes, and Local Inference Without a Server - Verify a local browser LLM before you trust it: check WebGPU support, hash the model file, and audit what your browser leaks while it runs.
- Post-Quantum TLS in 2026: What a Certificate Inspector Can and Cannot Tell You Yet - Half the web negotiates post-quantum handshakes while certificates stay classical. Run a five-minute local audit to see where your domains stand.
- Where Your Text Goes When You Check It for AI: Six Detectors Compared - Six AI detectors compared on signup, free caps, price, and where your text is actually processed, plus how to read a 99% accuracy claim.
- Testing a USB Audio Interface or DAC at Home: Browser Checks for Noise Floor, Loopback, and Latency - Test a USB audio interface or DAC noise floor, loopback quality, clipping headroom, and round-trip latency in your browser before the return window closes.
- Verifying Your FIDO2 Hardware Security Key: What a Browser Can Confirm - Verify your FIDO2 key is genuine with a browser-only routine: read its attestation chain, check fingerprint leaks, and test backup password strength.
Built with Astro and TypeScript. Installable as a PWA on desktop and mobile, or as a native app via the Microsoft Store.