Professional Developer Toolkit

About Team Tools — A Privacy-First Developer Toolkit

Team Tools is a curated collection of 9 client-side online utilities for front-end, back-end, and full-stack engineers. It covers JWT decoding, JSON formatting, JSON-to-Dart model generation, Unix timestamp conversion, Base64 encoding/decoding, IP geolocation lookup, image format conversion, JPG/PNG ⇄ PDF conversion, and image grayscale conversion. Every tool runs entirely in your browser via native web APIs (Web Crypto,Canvas, FileReader, fetch, etc.), so your input datanever leaves your device.

What makes Team Tools different: (1) Zero backend — tools keep working after the first load, even offline; (2) Deep educational content — every tool page ships with explanations, common error catalogs, and best-practice guides; (3) Fully open source on GitHub, with community contributions welcome.

Best Use Cases for Each Tool

• JWT Parser: Debug OAuth2/OIDC logins, inspect IdP Access Token payloads, verify token signatures with a known secret.
• JSON Parser: Pretty-print minified API responses, pinpoint syntax errors, and browse large JSON documents as a collapsible tree.
• JSON to Dart: Generate strongly-typed Flutter model classes withfromJson / toJson in one click, including nested objects and lists.
• Timestamp Converter: Convert between 10-digit seconds and 13-digit milliseconds Unix timestamps, with multi-timezone support.
• Base64 Tool: Debug JWT headers, Data URIs, MIME attachments, and URL-safe parameter encoding.
• IP Lookup: Identify the country, city, ISP, and timezone of unknown IPs from server logs or API gateway access records.
• Image Converter: Convert PNG/JPG/WEBP/AVIF/HEIC locally with adjustable quality — no upload required.
• JPG ⇄ PDF: Merge multiple ID photos or screenshots into a single PDF, or extract pages of a PDF as JPG images.
• Image Grayscale: Convert color photos to black-and-white using Canvas pixel-matrix algorithms, with full-resolution download.

Why "Client-Side Only" Matters

Most online tools require you to upload JWTs, API keys, or scanned contracts to their servers — a non-starter for enterprises with strict data-residency, healthcare (HIPAA), or financial (PCI-DSS) compliance requirements. Our design principle is simple:if it can run in a browser, it should not need a server.

We use the Web Crypto API for HMAC/RSA signature verification, Canvasfor pixel manipulation, FileReader for local file ingestion, andURL.createObjectURL for downloadable Blob links. No fetch call ever ships your input data to a third party.

Who Is It For?

• Web & mobile developers: daily debugging of tokens, API responses, and images.
• Backend & DevOps engineers: IP geolocation from access logs, timestamp unit conversion.
• Security & compliance teams: run common dev utilities without violating data-egress rules.
• Flutter developers: one-click Dart model generation from API JSON.
• Students & self-learners: treat each tool page as a hands-on tutorial.

Frequently Asked Questions (FAQ)

Are these tools completely free?

Yes — every tool on Team Tools is free to use, with no registration, no login, and no rate limits. The site is sustained by a small number of non-intrusive ads described in our about page.

Do I need to worry about my data being collected?

All core computations run locally. See our Privacy Policy for full details. We only use Google Analytics for anonymous traffic statistics, and we never collect the content you paste into the tools.

Is it mobile-friendly?

Fully responsive. The site works smoothly on phones, tablets, and desktops. For complex tasks like PDF page extraction, we recommend a desktop browser.

Can I use it offline?

After the first load, your browser caches all static assets. Most tools (except IP Lookup, which depends on a remote geo-database) will keep working with no network connection.