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
Decode from Base64 in the Browser: an Online Workflow for Logs, API Responses, and JWTs
When debugging APIs, JWTs, or data URIs, you often just need to Decode From Base64 directly in the browser. This guide shows how an in‑browser Base64 decoder online turns opaque payloads into readable text or downloadable files without writing code.
Base64 Encoder Online Guide for Developers: Principles, Browser Workflows, and Error‑Proof Usage
Need to inspect Base64 blobs from headers, logs, or small assets without leaving your browser? This guide shows how developer‑first, browser‑only Base64 encoder/decoder tools like toolcli handle text, images, and files safely while fitting into your existing workflow.
Online JSON Viewer and Formatter for Client‑Side Payload Debugging
When you’re staring at messy JSON payloads in devtools, you need a fast way to view, format, edit, and validate them without risking sensitive data. This guide shows how privacy-first, client-side toolcli helps you debug APIs entirely in the browser.