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Marketing
YouTube Thumbnail Auditor
Upload a thumbnail to check its resolution, aspect ratio, size, contrast and more, then score its click-through potential out of 10.
Open tool
Free Client-side
Explore the suite
Small tools.
Big possibilities.
Calculate. Create. Figure it out.
Free tools, right in your browser.
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Words
Word Scrambler & Solver
Unscramble letters and solve anagrams in 8 languages, or scramble your own text with a click. Free, instant and 100% in your browser.
Free Client-side
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Agency
Agency ROI Calculator
Work out retainer gross margin, client lifetime value, CAC payback and true lifecycle ROI for an agency engagement — instantly, in your browser.
Free Client-side
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Writing
Text Case Converter & Formatter
Convert text between UPPERCASE, lowercase, Title Case, Sentence case, URL slugs, camelCase, PascalCase and snake_case — with undo.
Free Client-side
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Business
Profit Margin & Markup Calculator
Work out gross profit, margin and markup from cost and price — or the price you need to hit a target margin, plus a price table for common margins.
Free Client-side
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17 free tools No sign-up Runs on your device
Agency AI voice platform | Partner
Your next leads get an instant answer.
GoHighLevel is the complete automation engine for agency operations. Connect AI voice agents, smart booking calendars, pipelines, and AI follow-up in one unified CRM.
All-in-one AI operating system
Bring your business into focus.
Integrate your operations with Centrix One's CRM, smart workflows, and AI voice interfaces. Centralize pipelines, instant messaging, and reporting in one accessible workspace.
Your everyday toolkit
Browse every tool/ 17
Words
Word Scrambler & Solver
Unscramble letters and solve anagrams in 8 languages, or scramble your own text with a click. Free, instant and 100% in your browser.
Free · client-sideOpen tool →
Agency
Agency ROI Calculator
Work out retainer gross margin, client lifetime value, CAC payback and true lifecycle ROI for an agency engagement — instantly, in your browser.
Free · client-sideOpen tool →
Marketing
Social Media Engagement Calculator
Calculate engagement rate per platform, compare it with industry ranges and estimate a sponsored post rate — free and entirely in your browser.
Free · client-sideOpen tool →
Developers
LLM API Cost Estimator
Estimate monthly LLM API spend across Claude, GPT, Gemini, DeepSeek and Grok from your request volume and token sizes. Prices verified and editable.
Free · client-sideOpen tool →
Education
Grade & Final Exam Planner
Work out your current weighted grade and the exact score your final exam needs to hit your target — or whether that target is still reachable.
Free · client-sideOpen tool →
Date & Time
Days Between Dates Calculator
Count the exact days, weeks and business days between any two dates, with inclusive or elapsed counting. Timezone-safe and free.
Free · client-sideOpen tool →
Math
Percentage & Discount Calculator
Four percentage modes in one page: percent of a value, percent change, sale discount, and the original price before a discount.
Free · client-sideOpen tool →
Money
Tip & Bill Split Calculator
Work out the tip, sales tax and total, then split it between any number of people with the pennies distributed so the shares add up exactly.
Free · client-sideOpen tool →
Date & Time
Age Calculator
Your exact age in years, months and days — plus total days lived and a countdown to your next birthday. Timezone-safe and entirely private.
Free · client-sideOpen tool →
Marketing
CPM & Ad Revenue Calculator
Solve CPM from a campaign, ad revenue from impressions, or the impressions needed to hit a revenue target — plus RPM per 1,000 pageviews.
Free · client-sideOpen tool →
Writing
Word & Character Counter
Live word and character counts, reading and speaking time, platform character limits and keyword density — all computed in your browser.
Free · client-sideOpen tool →
Finance
Compound Interest Calculator
Project investment growth from a lump sum plus regular contributions, with monthly, quarterly, annual or daily compounding and a doubling-time estimate.
Free · client-sideOpen tool →
Finance
Loan & Mortgage Payment Calculator
Work out the monthly repayment, total interest and true cost of a loan — and compare terms side by side to see what a shorter term is really worth.
Free · client-sideOpen tool →
Marketing
UTM Campaign URL Builder
Build tagged campaign URLs with the five standard UTM parameters, with consistent normalisation and the GA4 pairing rule checked before you copy.
Free · client-sideOpen tool →
Writing
Text Case Converter & Formatter
Convert text between UPPERCASE, lowercase, Title Case, Sentence case, URL slugs, camelCase, PascalCase and snake_case — with undo.
Free · client-sideOpen tool →
Business
Profit Margin & Markup Calculator
Work out gross profit, margin and markup from cost and price — or the price you need to hit a target margin, plus a price table for common margins.
Free · client-sideOpen tool →
Marketing
YouTube Thumbnail Auditor
Upload a thumbnail to check its resolution, aspect ratio, size, contrast and more, then score its click-through potential out of 10.
Free · client-sideOpen tool →
What every tool here has in common
Instant, because there is no server
Every tool runs in your browser with JavaScript. No request leaves your device when you press a button, so results appear as fast as you can type.
Nothing you type is uploaded
No accounts, no uploads, no logging of your input. Close the tab and it is gone — there is nothing to store and nothing to leak.
Written to be used, not just found
Each tool ships with a plain-English guide and a real FAQ underneath it, so you can understand the number you just got instead of trusting it.