---
title: "101Tool — API Development Launch | App Stack Builder"
description: "Free browser-based API, PDF, JSON, and developer utilities"
source: https://appstackbuilder.com/launches/101tool
retrieved: 2026-09-06
---

[All launches](https://appstackbuilder.com/launches)

![101Tool](https://eqksfcsypfaghvlfdsoo.supabase.co/storage/v1/object/public/tool-submissions/logos/8d27124c-4fdf-4573-98c3-2c09c27d8fc2.png)

API Development101tool.netJul 18, 2026

# 101Tool

Free browser-based API, PDF, JSON, and developer utilities

[Visit 101Tool](https://101tool.net/en)[Share on X](https://twitter.com/intent/tweet?text=%F0%9F%9A%80%20101Tool%20just%20launched%20on%20%40appstackbuilder%20%E2%80%94%20Free%20browser-based%20API%2C%20PDF%2C%20JSON%2C%20and%20developer%20utilities&url=https%3A%2F%2Fappstackbuilder.com%2Flaunches%2F101tool)

![101Tool screenshot](https://eqksfcsypfaghvlfdsoo.supabase.co/storage/v1/object/public/tool-submissions/screenshots/2bf6fd99-de6c-49e2-83d9-700b28f88517.png)

## About

101Tool is a lightweight browser-based workspace for developers and small teams. Its API Studio supports REST, GraphQL and WebSocket workflows, multi-request tabs, Params, Auth, Headers, Body and Tests editing, response inspection, variable extraction, collection runs, Postman Collection imports and OpenAPI imports. The platform also includes local PDF optimization, JSON-to-TypeScript, Go and Python Pydantic code generation, and a developer toolkit for base, ASCII, color, URL, Base64, hexadecimal and text conversions. Korean and English interfaces, responsive layouts, light and dark themes, and detailed technical guides are included. Core utilities work without account creation or app installation.

## Pricing

100% free. No signup, installation, subscription, or usage quota for core tools.

J

Submitted by

Jason Lee

## Built something?

Submit your tool to get featured on our daily launches and a shoutout on social.

[Submit your tool](https://appstackbuilder.com/submit-tool)