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
Using Online JSON Validator and Formatter Tools in a Developer Workflow
When you are debugging APIs, logs or config files, a browser-based JSON validator and formatter in toolcli lets you quickly validate, beautify and inspect payloads entirely client-side, keeping your workflow fast while protecting sensitive data from being uploaded.
Online Base64 Encoder and Decoder in Toolcli for Privacy-First Development Workflows
When you need to inspect or generate Base64 for text, files, or images without leaking payloads, Toolcli’s Online Base64 Encoder And Decoder runs entirely in your browser and walks you through safe workflows, URL‑safe variants, and validation of common encoding mistakes.
Using Free Online JSON Formatter and Validator Tools in a Privacy-Friendly Frontend Workflow
When you’re debugging APIs in the browser, a free, privacy‑friendly JSON formatter like toolcli lets you safely beautify, validate, and inspect JSON tree structures, then chain in timestamp, Base64, or JWT helpers without ever sending payloads to a backend.