Free browser tools for marketing, SEO and data work
20 free tools that run entirely in your browser. Nothing you paste or open is uploaded. Pick a tool below or search by what you need to do.
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Marketing
Campaign links, list cleanup and HubSpot cost planning.
UTM Builder
Tag campaign links with clean, consistent UTM parameters.
Email List Cleaner
Extract, dedupe and fix typos in email lists before import.
HubSpot Seat Cost Calculator
Estimate HubSpot monthly and first-year cost by hub and seats.
Open Graph Preview
See your social link card and fix og:title, og:image and more.
SEO and AI search
Snippets, structured data and files that search engines and AI assistants read.
Meta Title and Description Length Checker
Measure title tags and meta descriptions in pixels and characters.
JSON-LD Schema Generator
Create LocalBusiness, Article and Product structured data.
llms.txt Generator
Write an llms.txt file that points AI assistants to your key pages.
robots.txt and Sitemap Checker
Test robots.txt rules for any bot and validate XML sitemaps.
URL Slug Generator
Turn titles into short, clean, lowercase URL slugs.
Data and developer
CSV, JSON and regex work without installing anything.
CSV Cleaner and Deduper
Trim, dedupe and drop blank rows from a CSV without uploading it.
CSV to JSON Converter
Convert CSV to JSON and back, with types and nested keys.
JSON Formatter and Validator
Pretty print, validate and minify JSON with clear error positions.
Regex Tester
Test regular expressions with highlights, groups and replace.
Text and writing
Counting, casing and tidying words.
Images and design
Compress images and check color contrast.
Utilities
Passwords, QR codes and time conversions.
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HubSpot reports Q3 2026 revenue of $947.6 million, up 17%
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HubSpot sets February 2027 shutdown for design manager serverless functions
HubSpot is retiring serverless functions built in the design manager and Node.js 20 and earlier for workflow custom code actions. Existing design manager functions stop running on February 1, 2027.
Why do these tools run in the browser?
Every tool on Toolbench does its work with JavaScript on your own device, so your files, lists and text never leave your computer.
That makes them safe for client data, contact lists and drafts. It also means they work offline once the page has loaded. The only tools that touch the network are the robots.txt and sitemap checker, which asks the site you name for its public file directly from your browser, and the image tools, which never upload anything.