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
Formatter Json Online Guide: Beautify, Validate, and Inspect API Data in the Browser
Toolcli’s browser‑only JSON formatter helps developers safely beautify, validate, and inspect API responses and logs without uploading data. This guide shows how to format, debug, and compare JSON online using its editor, viewer, and validation tools.
Json Online Formatter Workflows for Debugging APIs and Logs
When API payloads, logs, or configs are hard to read, a privacy‑friendly Json Online Formatter like toolcli lets you validate, pretty‑print, explore, and debug JSON entirely in your browser, with optional tree views and conversions such as CSV or XML.
Converter Unix Timestamp to Date: Using Toolcli for Accurate Epoch to Human Time
When logs, payloads, or metrics only show Unix epoch numbers, it’s hard to see what actually happened and when. This guide shows how developers can turn those timestamps into readable dates using toolcli’s in‑browser converter with precise units and UTC/local views.