Tools Index
- JSON Beautifier: Instantly beautify, indent, and format raw JSON into a clean, readable structure with syntax highlighting. Ideal for analysts, QA teams, and operations staff, this tool makes it easy to inspect API responses, debug payloads, or review configuration files. Simply paste or upload your JSON and get a consistently formatted output that’s easy to scan and understand. It supports large files, works entirely in-browser, and requires no signup or tracking. Whether you’re working with REST APIs, server logs, or event data, this tool streamlines your workflow and helps you catch issues faster with clear, structured JSON output.
- Directory Tree Generator: Convert your folder structure into a clean, visual tree using simple text formatting. This tool helps technical writers, project managers, and operations teams quickly visualize and document directory layouts for codebases, design systems, or file structures. Just paste a list of files or directories, and the tool will generate a structured, collapsible tree view that’s easy to share or embed in documentation. It’s perfect for readmes, wikis, onboarding guides, and architecture overviews. The output is fully client-side, so your data stays private. Whether you’re organizing source code or documenting a project’s hierarchy, this tool makes folder structures instantly understandable.
- XML Beautifier: Clean up and format raw XML with proper indentation and tag structure for improved readability and easier debugging. This tool is ideal for QA teams and engineers working with XML-based APIs, RSS feeds, or backend service responses. Simply paste your unformatted XML, and the tool will automatically reformat it into a well-structured, easy-to-read layout. It highlights nested tags, preserves attributes, and ensures consistent spacing, making complex XML much easier to navigate. Everything runs client-side to ensure data privacy. Whether you're troubleshooting video tags or reviewing integration payloads, this formatter saves time and reduces parsing errors.
- VAST Inspector: Test and debug VAST tags with full XML inspection, playback simulation, and real-time event tracking—all in one tool. Built for QA teams and video operations specialists, this tool uses the Google IMA SDK to simulate real-world playback and surface issues in tag structure or delivery. Paste your VAST tag to view formatted XML, preview creative playback, and monitor SDK events like load, start, and complete in real time. It’s ideal for troubleshooting wrappers, verifying third-party tags, or confirming tracking pixels. Everything runs client-side for speed and privacy during development and testing.
- User Agent: Analyze any User-Agent string to identify device class, OS, browser, and engine in seconds. This tool is designed for QA, ops, and support teams who need quick, reliable device context from logs, tickets, or ad calls. Paste a UA and get a clean summary plus a structured JSON output you can copy or share. It runs fully in-browser for fast results and privacy-friendly inspection.
- JSON Diff: Compare two JSON objects side-by-side to quickly identify differences in structure, keys, and values. This tool is designed for QA teams, analysts, and operations staff working with API responses, configuration files, or data migrations. Paste two JSON payloads into the editor, and the tool highlights added, removed, and modified elements in real time. It supports deep nesting, formatted output, and synchronized scrolling for easy visual comparison. Whether you're validating integrations, debugging discrepancies, or reviewing schema changes, this tool makes it fast and intuitive. Everything runs client-side, ensuring privacy, speed, and a distraction-free environment for precise JSON inspection.
- MP4 to HLS Converter: Convert standard MP4 video files into HLS format (.m3u8 playlist and .ts segments) directly in your browser using FFmpeg.wasm. This tool is perfect for media teams, streamers, and engineers who need to test HLS playback or prepare content for adaptive streaming without server-side encoding. Upload an MP4 file and instantly generate a ready-to-serve HLS package—all client-side, with no uploads or external processing. Ideal for debugging, lightweight workflows, or creating demo streams, it supports configurable segment lengths and playback testing. Whether you're verifying HLS compatibility or preparing demos, this tool offers fast, private, browser-based video conversion.
- Find and Replace: Search and replace text or code using advanced regex support, case sensitivity, whole word matching, and more—all powered by Monaco Editor. With a large library of preset find/replace rules, this tool makes it easy to clean up HTML, reformat JSON, fix encoding issues, and much more. Perfect for QA engineers, content editors, and anyone working with structured or unstructured text. Preview matches live, use smart presets, and export results with a clean, modern UI that’s fast and fully in-browser.
- Base64 / URL Encoder: Encode and decode Base64, Base64URL, and URL-encoded strings with a clean, reliable workflow. Designed for QA, ops, and engineering teams who need to inspect payloads, troubleshoot tokens, or normalize URLs quickly. Paste input, pick a mode, and get an instant output you can copy or reuse—entirely in-browser.
- TCF String Decoder: Decode IAB TCF v2 consent strings into human-readable metadata, purposes, and vendor consent arrays. Paste a TC string from a CMP or euconsent-v2 cookie, and instantly see what it contains for QA, troubleshooting, and compliance checks. Everything runs client-side for privacy.
- URL Redirect Resolver: Trace the full redirect path of any URL—including HTTP status codes, redirect locations, and per-hop latency—so you know exactly where a link ends up. Ideal for debugging short links, tracking domains, and campaign destinations before you click. Fast, clear, and privacy-friendly.
- Cookie Inspector: Parse and analyze Set-Cookie headers or page cookie dumps to surface security, scope, and privacy issues with remediation guidance. Useful for privacy, security, and ad ops teams to quickly understand cookie risks and fixes.
AdTechToolkit – Fast, reliable tools for QA and ops
Debug VAST tags, trace redirects, parse user agents, and format JSON/XML with fast, browser-based tools built for modern teams.
Most tools run locally; URL fetches only happen when you request them.
JSON Beautifier
Instantly beautify, indent, and format raw JSON into a clean, readable structure with syntax highlighting. Ideal for analysts, QA teams, and operations staff, this tool makes it easy to inspect API responses, debug payloads, or review configuration files. Simply paste or upload your JSON and get a consistently formatted output that’s easy to scan and understand. It supports large files, works entirely in-browser, and requires no signup or tracking. Whether you’re working with REST APIs, server logs, or event data, this tool streamlines your workflow and helps you catch issues faster with clear, structured JSON output.
Directory Tree Generator
Convert your folder structure into a clean, visual tree using simple text formatting. This tool helps technical writers, project managers, and operations teams quickly visualize and document directory layouts for codebases, design systems, or file structures. Just paste a list of files or directories, and the tool will generate a structured, collapsible tree view that’s easy to share or embed in documentation. It’s perfect for readmes, wikis, onboarding guides, and architecture overviews. The output is fully client-side, so your data stays private. Whether you’re organizing source code or documenting a project’s hierarchy, this tool makes folder structures instantly understandable.
XML Beautifier
Clean up and format raw XML with proper indentation and tag structure for improved readability and easier debugging. This tool is ideal for QA teams and engineers working with XML-based APIs, RSS feeds, or backend service responses. Simply paste your unformatted XML, and the tool will automatically reformat it into a well-structured, easy-to-read layout. It highlights nested tags, preserves attributes, and ensures consistent spacing, making complex XML much easier to navigate. Everything runs client-side to ensure data privacy. Whether you're troubleshooting video tags or reviewing integration payloads, this formatter saves time and reduces parsing errors.
VAST Inspector
Test and debug VAST tags with full XML inspection, playback simulation, and real-time event tracking—all in one tool. Built for QA teams and video operations specialists, this tool uses the Google IMA SDK to simulate real-world playback and surface issues in tag structure or delivery. Paste your VAST tag to view formatted XML, preview creative playback, and monitor SDK events like load, start, and complete in real time. It’s ideal for troubleshooting wrappers, verifying third-party tags, or confirming tracking pixels. Everything runs client-side for speed and privacy during development and testing.
User Agent
Analyze any User-Agent string to identify device class, OS, browser, and engine in seconds. This tool is designed for QA, ops, and support teams who need quick, reliable device context from logs, tickets, or ad calls. Paste a UA and get a clean summary plus a structured JSON output you can copy or share. It runs fully in-browser for fast results and privacy-friendly inspection.
JSON Diff
Compare two JSON objects side-by-side to quickly identify differences in structure, keys, and values. This tool is designed for QA teams, analysts, and operations staff working with API responses, configuration files, or data migrations. Paste two JSON payloads into the editor, and the tool highlights added, removed, and modified elements in real time. It supports deep nesting, formatted output, and synchronized scrolling for easy visual comparison. Whether you're validating integrations, debugging discrepancies, or reviewing schema changes, this tool makes it fast and intuitive. Everything runs client-side, ensuring privacy, speed, and a distraction-free environment for precise JSON inspection.
MP4 to HLS Converter
Convert standard MP4 video files into HLS format (.m3u8 playlist and .ts segments) directly in your browser using FFmpeg.wasm. This tool is perfect for media teams, streamers, and engineers who need to test HLS playback or prepare content for adaptive streaming without server-side encoding. Upload an MP4 file and instantly generate a ready-to-serve HLS package—all client-side, with no uploads or external processing. Ideal for debugging, lightweight workflows, or creating demo streams, it supports configurable segment lengths and playback testing. Whether you're verifying HLS compatibility or preparing demos, this tool offers fast, private, browser-based video conversion.
Find and Replace
Search and replace text or code using advanced regex support, case sensitivity, whole word matching, and more—all powered by Monaco Editor. With a large library of preset find/replace rules, this tool makes it easy to clean up HTML, reformat JSON, fix encoding issues, and much more. Perfect for QA engineers, content editors, and anyone working with structured or unstructured text. Preview matches live, use smart presets, and export results with a clean, modern UI that’s fast and fully in-browser.
Base64 / URL Encoder
Encode and decode Base64, Base64URL, and URL-encoded strings with a clean, reliable workflow. Designed for QA, ops, and engineering teams who need to inspect payloads, troubleshoot tokens, or normalize URLs quickly. Paste input, pick a mode, and get an instant output you can copy or reuse—entirely in-browser.
TCF String Decoder
Decode IAB TCF v2 consent strings into human-readable metadata, purposes, and vendor consent arrays. Paste a TC string from a CMP or euconsent-v2 cookie, and instantly see what it contains for QA, troubleshooting, and compliance checks. Everything runs client-side for privacy.
URL Redirect Resolver
Trace the full redirect path of any URL—including HTTP status codes, redirect locations, and per-hop latency—so you know exactly where a link ends up. Ideal for debugging short links, tracking domains, and campaign destinations before you click. Fast, clear, and privacy-friendly.
Cookie Inspector
Deterministic outputs
Tools favor strict parsing over guesses and surface versions and standards where relevant.
Privacy-first by design
Most workflows run entirely in-browser. URL tools only fetch what you submit and do not store payloads.
Built for repeatable QA
Examples, summaries, and structured outputs help teams validate results quickly and consistently.
Who these tools are for
Teams who need quick answers without spinning up a local dev environment. Think QA analysts, ops teams, product managers, or anyone who needs to inspect data, validate tags, or trace a link in seconds.
- QA and release checks before changes go live
- Operations workflows with repetitive data validation
- Support teams diagnosing payload or link issues
How it works
Most tools run entirely in your browser. For URL-based tools, the app only fetches what you ask it to fetch and does not store the results.
- Paste input and see results instantly
- Copy or download outputs when needed
- Examples included to help you get started
About AdTechToolkit
General-purpose dev tools are everywhere. AdTechToolkit focuses on the workflows that rarely get first-class tooling: video tags, redirects, and payload validation.
We build these tools to reduce friction in daily operations and keep debugging fast, reliable, and transparent.
Built for real teams
Shaped by QA checklists, rollout workflows, and real production incidents.
Designed for data safety
Most tools run in-browser. URL fetches only happen when you request them.
Independently maintained
Operated by CosmicQuest Studios LLC with ongoing updates based on user feedback.
Standards-aware and transparent
We align key tools with official specifications and surface versions where possible. See the most relevant references below.
Why teams trust the outputs
- Strict validation with clear pass/fail signals.
- Versioned references and cached lists surfaced when relevant.
- Outputs are deterministic and reproducible for audits.
How teams use AdTechToolkit
Practical, repeatable tasks we see every day in QA, operations, and engineering teams.
VAST QA and playback
Inspect VAST XML, validate wrapper chains, and observe IMA playback events when troubleshooting delivery issues.
Redirect chain audits
Trace link hops, spot unexpected domains, and verify final landing pages before campaigns launch.
Payload formatting and diffing
Beautify JSON/XML, compare versions, and keep configuration data readable during QA.
User-agent analysis
Parse UA strings to diagnose device segmentation, browser quirks, and SDK environments.
Media prep and playback
Convert MP4 to HLS for quick testing and validate stream readiness.
Regex cleanup and edits
Apply structured find/replace rules to normalize text and clean messy payloads.
Learn the basics in minutes
Short guides explain the most common workflows in plain language. If you are new to tags, redirects, or structured data, start here.
Frequently asked questions
Is this a free service?
Yes. The core tools are free to use, with no signup required for most features.
Do you store tool inputs?
Most tools run locally in your browser. Server fetches only occur when you request them for URL-based tools.
Who runs AdTechToolkit?
AdTechToolkit is operated by CosmicQuest Studios LLC, an independent software studio focused on practical workflows.
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