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
Workflow-Focused Developer Tools Online: Text, Data, and Security Utilities in One Privacy-Friendly Workspace
When you’re juggling JSON payloads, token debugging, and tiny format conversions, a browser-native toolbox like toolcli can cut friction. This guide shows how a unified, privacy-friendly workspace of free online developer tools streamlines everyday web workflows.
Base64 Encoder/Decoder Download vs Online Tools for Developer Workflows
When you search for a Base64 encoder/decoder download, the real decision is between installing a client and using a browser‑only studio like toolcli. This guide helps developers choose privacy‑first workflows to encode, decode, and safely restore files from Base64 online.
From Base64 Encoder Decoder Download to Browser‑Only Tools: Using Toolcli as a Privacy‑First Base64 Studio
Instead of downloading a Base64 encoder–decoder, this guide shows how developers can use toolcli as a privacy‑first, browser‑only Base64 studio to encode and decode text and files, inspect API payloads and logs, and generate downloadable files without sending data to any server.