Privacy-first
Local-first, with network tools clearly marked
Know your tools instantly
Convert, inspect, and ship faster with toolcli
Text, data, time, colour, security, and generator utilities live in a single workspace so you always know where to go for quick fixes.
High performance
Edge-accelerated delivery
Multi-language & themes
English/Chinese with light/dark modes
Workflow Picks
Featured workflows
01Open workflow →02Open workflow →03Open workflow →
401 / 403 and webhook troubleshooting
API Auth Debugger
Check JSON bodies, diagnose JWT timing issues, and verify HMAC-SHA256 signatures.
Multi-line content processing
List Cleanup & Export
Clean multi-line content, normalize lists, and export reusable formats.
Web image publishing workflow
Responsive Image Publisher
Turn source images into responsive AVIF and WebP assets, ready-to-use picture markup, and one downloadable package.
Tool Picks
Featured tools
JSON Toolkit
Format, compact, or validate JSON payloads.
Batch Image Lab
Compress multiple images in one go with unified settings, previews, and bulk downloads.
Time Studio
Convert timestamps and dates between multiple formats with ease.
Hash Workbench
Generate SHA digests or HMAC signatures for payloads.
Color Lab
Convert between HEX/RGB or generate vibrant palettes instantly.
Identifier Forge
Mint UUIDs, Nano IDs, secure tokens, passwords, or filler text.
Practical guides
From the blog
Online Sequencer Workflow for MIDI Tracks and Browser-Based Beat Making
Online Sequencer tools let developers sketch MIDI patterns and beats directly in the browser, no login or installs. This overview shows how to design, edit, and share client-side tracks efficiently while keeping data local and privacy‑friendly.
Performance Tool Workflow Guide for Browser‑Based Developer Testing
Slow pages, heavy bundles, and opaque API payloads can derail your web app. This guide shows how to use browser-based, privacy-friendly performance tools to audit frontend assets, JSON/JWT, and logs with step-by-step workflows and a practical checklist.
Logitech Unifying Software and Receiver Setup Guide for Modern Windows
If you’re trying to download, set up, or troubleshoot a Logitech Unifying receiver on Windows 10 or 11, this guide explains the legacy Unifying software, the move to Logi Options+, and gives developer‑oriented checklists for safe pairing and diagnostics.