# StackOnlineTools: All-in-One Online Tools

> "All-in-one productivity and developer tools with JSON formatter, text converters, password generator, SEO utilities, and more.

Canonical page: [https://chrome-stats.com/d/stack-online-tools](https://chrome-stats.com/d/stack-online-tools)

## Overview

- **ID:** `stack-online-tools`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** stackonlinetools.com
- **Category:** web-development,privacy-security
- **Daily users:** 1
- **Weekly downloads:** 1
- **Version:** 1.2.5
- **Last updated:** 2026-09-07
- **First published:** 2025-12-11
- **Size:** 151 KB
- **Data as of:** 2026-09-14
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/stack-online-tools/)
- **Website:** [https://stackonlinetools.com](https://stackonlinetools.com/)

## Description

All-in-one <strong>productivity</strong> and <strong>developer toolkit</strong> for Firefox. Stop switching between sites or loading multiple add-ons — access 30+ essential online tools, text utilities, and developer helpers right from your browser.

Built for developers, content creators, digital marketers, SEO professionals, and everyday users, this extension speeds up workflows with fast, lightweight, and privacy-first utilities that run locally when possible.

<strong>Support sidebar panel</strong>

✔ What You Get

<strong>Developer &amp; Code Utilities</strong>
<ul><li>JSON Formatter &amp; Validator – instant formatting, beautification, and error checking</li><li>JSON ↔ YAML Converter</li><li>Base64 Encode/Decode</li><li>URL Encode/Decode</li><li>HTML, CSS &amp; JS Minifiers</li><li>Markdown ↔ HTML Converter</li><li>Robots.txt Generator for SEO and crawler structuring</li><li>Epoch Unix Timestamp</li><li>JWT Encoder/Decoder</li><li>Hash Generator</li><li>QR Code Generator</li><li>Diff Checker</li><li>Color Picker &amp; Converter</li><li>CSS Unit Converter</li></ul>
These tools make Stack Online Tools a top choice for developer tools, programmer utilities, and code formatters in Firefox.

<strong>Text &amp; Content Utilities</strong>
<ul><li>Case Converter (uppercase, lower, title, camel, snake, kebab)</li><li>Word &amp; Character Counter</li><li>URL Slug Generator</li><li>Line Counter &amp; List Randomizer</li><li>Text Repeater</li><li>Text Reverser</li><li>Remove Duplicate Lines</li><li>Lorem Ipsum Generator</li></ul>
Essential for writers, bloggers, SEO editors, and anyone optimizing content.

<strong>Security &amp; Password Tools</strong>
<ul><li>Strong Password Generator (custom options)</li><li>Password Strength Checker</li></ul>
Perfect for web developers, admins, and safe credential creation.

<strong>Image &amp; File Tools</strong>
<ul><li>PNG ↔ JPG Converter</li><li>PDF ↔ JPG Converter (secure web tool)</li></ul>
<strong>Quick Calculators &amp; Generators</strong>
<ul><li>Age Calculator</li><li>Percentage Calculator</li><li>Random Name Generator</li><li>Random Address Generator</li></ul>
<strong>Key Benefits</strong>

✔ All-in-one productivity tools &amp; utilities
✔ Fast, lightweight, and user-friendly
✔ Privacy-first — tools run locally
✔ No account, registration, or tracking
✔ Replaces multiple single-purpose add-ons

Stack Online Tools supports nearly every common workflow, from text conversions and data formatting to developer operations, making it one of the most versatile Firefox add-ons available.

<strong>Who This Is For</strong>
<ul><li>Developers &amp; engineers</li><li>SEO specialists &amp; marketers</li><li>Writers &amp; editors</li><li>Designers &amp; web admins</li><li>Students &amp; everyday users</li></ul>

## Rankings

- #113,370 — Overall
- #243 — programmer

## Permissions and access

### Permissions

- `storage`
- `contextMenus`
- `https://stackonlinetools.com/*`

## Safety

- **Risk impact:** Low risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- Request access to the following domains: stackonlinetools.com
- This extension was recently updated in the past month. New updates may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Similar extensions and apps

- [99Tools: Web Developer Toolkit](https://chrome-stats.com/d/99tools-web-developer-toolkit) — 1 users
- [supertools-browser-toolkit](https://chrome-stats.com/d/supertools-browser-toolkit) — 3 users
- [NexusLabs DevKit — 8+ Developer Tools](https://chrome-stats.com/d/nexuslabs-devkit-dev-tools)
- [ZeroWebTools Companion](https://chrome-stats.com/d/zerowebtools-dev) — 1 users
- [Dev Toolkit — 440+ Developer Tools](https://chrome-stats.com/d/dev-toolkit-440-devtools) — 1 users
- [Online Tools by 10015.io](https://chrome-stats.com/d/online-tools-by-10015-io) — 914 users, 4.67 / 5
- [Smart Text Tools](https://chrome-stats.com/d/smart-text-tools)
- [Tool Forge](https://chrome-stats.com/d/tool-forge)
- [Tools](https://chrome-stats.com/d/toolbox) — 7 users
- [JSON-Tool](https://chrome-stats.com/d/json-tool) — 2 users
- [Developer Toolkit](https://chrome-stats.com/d/%E5%BC%80%E5%8F%91%E8%80%85%E5%B7%A5%E5%85%B7%E5%8C%85) — 1 users
- [Text Toolkit : (AIO Text Tools)](https://chrome-stats.com/d/text-toolkit) — 28 users, 3.50 / 5

---

Source: [Chrome-Stats](https://chrome-stats.com/d/stack-online-tools)