Free, Private Developer Utilities
A fast, offline-first collection of 258+ developer utilities across 26 categories. Everything runs strictly inside your local browser memory — zero server uploads, zero tracking, zero rate limits, and zero latency.
100% Local Privacy
Tokens, JSON payloads, passwords, and database schemas never leave your device. Zero cloud storage or server-side logging.
Zero Latency & Offline
Instant keystroke execution via Web Crypto, HTML5 Canvas, and Web Audio. Fully operational even with no internet connection.
258+ Free Tools
Formatters, converters, crypto, networking, AI prompts, CSS generators, and regex tools — 100% free with no sign-ups or keys.
Chat with a Tiny In-Browser LLM
Interact with a lightweight language model running 100% locally inside your browser memory. Your prompts, code, and chat history never leave your device.
Browse All 26 Categories
Sorted alphabetically from A to ZAI & LLM
Prompt engineering, context calculators, LLM benchmarks, and AI developer utilities.
Audio
Sound synthesis, microphone recording, noise, and acoustics.
Barcodes
Generate linear 1D barcodes and product labels.
Calculators
Financial rates, percentages, file transfer speeds, and formulas.
Colors
Color space conversion, harmonies, and accessibility contrast.
Converters
Transform data structures across formats and tabular schemas.
Cron
Parse cron schedules and visually construct crontab expressions.
Cryptography
Hashes, asymmetric keys, symmetric ciphers, and signatures.
CSS
Visual generators for shadows, glassmorphism, shapes, and gradients.
Encoding
Binary, character, URL, and byte-level codecs.
Formatters
Prettify, format, validate, and minify source code and queries.
Generators
UUIDs, random tokens, fixtures, and mock datasets.
Images
Compress, resize, crop, filter, convert, and inspect images.
JSON
Validate schemas, query paths, and diff JSON structures.
Logs
Filter, tail, and analyze text logs in real-time.
Networking
HTTP, cURL, DNS, IP subnets, ports, headers, and web protocols.
Playgrounds
Isolated client-side code execution environments.
QR Codes
Generate and scan two-dimensional matrix QR codes.
RegEx
Regular expression authoring, testing, and pattern reference.
Security
Tokens, certificates, HTTP headers, and credential validation.
SEO
Search engine crawler rules, meta tags, and sitemaps.
System
Linux octal file permissions, umask math, and semantic versioning.
Text
String manipulation, line sorting, sanitization, and text analysis.
Time
Epoch timestamps, time zones, elapsed intervals, and dates.
Video
Screen recording, clip conversion, and frame capture.
Web APIs & Cloud
Browser-based API clients, webhook verifiers, Cloud SDKs, and DNS explorers.
Why In-Browser Developer Utilities?
Traditional web converters transmit your payloads, authorization tokens, database dumps, and code snippets to remote backend servers. Even with SSL, these requests are frequently captured in web server logs, APM traces, error reporting platforms, and reverse proxy caches. debug.tools eliminates this risk by executing 100% of operations in the browser's local sandbox memory.
Engineered for Maximum Speed
Because calculations run locally using hardware-accelerated Canvas 2D, the native Web Crypto Substring APIs, and V8/SpiderMonkey JIT compilation, transformations that take seconds over high-latency networks complete in sub-millisecond speeds locally with zero bandwidth overhead.
Frequently Asked Questions
What is debug.tools and how does it work?
debug.tools is a free, privacy-first collection of 258+ developer utilities. Every tool executes 100% client-side in your web browser using modern Web APIs, Canvas, Web Audio, Web Workers, and Web Crypto. Nothing is ever sent to a remote server.
How is complete privacy guaranteed?
No server-side processing exists. Your sensitive JSON payloads, JWTs, cryptographic keys, database exports, and files never leave your device memory. You can inspect the network tab in browser developer tools to verify that zero payload data is transmitted.
Can I use debug.tools completely offline?
Yes. Once cached by your browser, debug.tools operates with full functionality offline, without requiring an active internet connection.
Are there any usage limits, fees, or account sign-ups?
No. All utilities are 100% free with zero accounts, zero rate limits, zero paywalls, and zero trackers. You can use them for personal, open-source, or enterprise commercial workflows.
Why choose browser-native tools over traditional cloud-based utilities?
Cloud converters and formatters frequently log payloads into access logs, analytics platforms, or AI training sets, exposing proprietary database schemas, bearer tokens, or internal code. In-browser utilities eliminate data leakage risks completely.