ToolStack AI — Free Online Tools for Creators, Developers & Businesses
A free collection of browser-based tools for creators, developers, marketers and businesses: format and validate JSON, compress or convert PDFs, generate meta tags and schema markup, check cold-email copy against spam filters — or lose an afternoon to the joke generators and quizzes. Everything runs on your device. No signup, no uploads.
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Fun & Games
Joke generators, quizzes, party games, brain teasers, tiny arcade games and random-decision tools.
AI Service Status Board
Live operational uptime and status tracker for ChatGPT, Claude, Midjourney, ElevenLabs, Suno, and Cursor.
Free AI Tools Directory
Searchable, category-filtered directory of top free AI tools for text, image, coding, and video.
Quotation Generator
Calculate line items, taxes, and instantly export client PDF quotes locally.
Image Converter & WebP Optimizer
Convert PNG/JPG to WebP, resize, and compress images directly in your browser.
JSON Formatter & Validator
Validate, prettify, or minify raw JSON strings instantly with error catching.
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PDF Compressor
Shrink a heavy PDF by re-rendering each page at a resolution you choose.
PDF to JPG
Turn every page into its own JPEG, at the resolution you pick.
PDF to PNG
Convert pages to lossless PNGs — sharp text, no compression artefacts.
JPG to PDF
Combine photos and scans into one PDF, in the order you choose.
PNG to PDF
Combine PNGs and screenshots into one PDF without losing quality.
Image to PDF
Mix JPGs and PNGs into a single PDF — A4, Letter or borderless.
PDF Page Extractor
Pull only the pages you need into a new, much smaller PDF.
PDF Page Rotator
Fix sideways or upside-down pages by 90°, 180° or 270°.
PDF Page Reorderer
Rearrange pages by editing a list that starts out already correct.
PDF Password Protector
Encrypt a PDF with a password and set printing and copying permissions.
PDF Unlocker
Remove a password you already know from your own PDF.
PDF Metadata Remover
See and clear the author, title, creator and timestamps inside a file.
PDF Watermark Tool
Stamp DRAFT, CONFIDENTIAL or a client name across the pages.
PDF to Text
Copy the text layer out of a PDF, per page, into editable text.
Text to PDF
Typeset plain text into a clean, paginated PDF with page numbers.
Base64 Encoder & Decoder
Instantly convert plain text or API credentials to and from Base64 encoding.
Social Chat Generator
Create realistic fake WhatsApp & Instagram DM chat screenshots for social posts and ads.
YouTube & Vimeo Thumbnail Downloader
Extract HD thumbnails instantly from video URLs.
AI Lead Qualification
Evaluate prospect details against your ICP and generate priority scores.
Cold Email Spam-Word Checker
Instant spam trigger word detection and deliverability scoring for outbound outreach and newsletters.
Script Hook & Retention Checker
Score the first 3 seconds of your video script against viral retention patterns for Reels, TikTok, and Shorts.
Meta Tag Generator
Build a complete, correctly escaped HTML head block — title, description, robots, canonical and more.
Open Graph Generator
Generate og: tags and preview exactly how your link renders on Facebook, LinkedIn and WhatsApp.
Twitter/X Card Generator
Build summary and large-image card tags, with a live mockup of the card your link will render.
SEO Title & Snippet Optimizer
Measure real pixel width, preview the Google snippet, and get concrete fixes when your headline truncates.
Meta Description Writer
Turn a keyword and a one-line page summary into five ready-to-paste descriptions, with live counts.
SERP Preview Tool
See exactly how your title, URL and description render in Google — including where each one truncates.
URL Slug Generator
Turn a headline into a clean URL slug: lowercase, hyphenated, accents stripped, optional stop words removed.
Keyword Density Checker
Find the phrases your text repeats most, with counts, density percentages and an over-stuffing warning.
Keyword Counter
Count a keyword in your draft with density, word count, reading time and every occurrence located.
Robots.txt Generator
Build a valid robots.txt with per-bot rules, crawl-delay and your sitemap location. Copy or download it.
Sitemap.xml Generator
Turn a list of URLs into a valid XML sitemap with lastmod, changefreq and priority on every entry.
Schema Markup Generator
Generate JSON-LD structured data for Organization, Product, Event, Recipe and more — with required-field checks.
FAQ Schema Generator
Turn your questions and answers into FAQPage JSON-LD that can win expandable results in Google.
Article Schema Generator
Build Article, BlogPosting or NewsArticle JSON-LD with author, publisher, image and publication dates.
Local Business Schema Generator
Create LocalBusiness JSON-LD with address, geo coordinates, opening hours and aggregate rating.
AI Model Comparison Matrix
ChatGPT, Claude, DeepSeek and Gemini side by side — context windows, free tiers and real strengths.
Which AI Tool Should I Use?
Five questions about your task, budget and privacy needs, and one recommendation with the reasoning.
WhatsApp & IG Support Bot
Multi-tenant RAG support agent with automated human handoff in Slack.
AI Video Ad Generator
Generate scene-by-scene visual prompts for real estate, e-commerce, and tech.
About ToolStack AI
ToolStack AI is a free collection of online tools that run entirely in your browser. There is nothing to install and no account to create, and your files are never uploaded to a server — a tool loads, does its work on your own device, and hands the result straight back to you to copy or download.
The tools are grouped into PDF utilities, SEO and website tools, client and sales helpers, AI support, creator and video tools, and a large Fun & Games section of joke generators, quizzes and party games. They are built for the people who hit these problems in the middle of a working day — developers tidying up JSON, founders checking an email against the spam-word checker, marketers sizing up a PDF before it goes out, and anyone who needs meta tags or schema markup written correctly the first time. When you want the lighter end of the collection, the Fun & Games hub collects every joke, quiz and game in one place.