THE PASTEZAP TOOLKIT
Marketing & Social Media
UTM links, A/B test significance, sample sizes, CPM, ROAS, break-even, LTV:CAC, engagement rates, post length checks and WhatsApp links.
Choose from 14 focused tools. Each page shows supported formats, practical examples and input limits before you begin. No account is required.
14 tools
UTM Builder (Campaign URL Builder)
Build campaign links with UTM parameters for Google Analytics, keep naming consistent, and get a QR code and HTML link.
WhatsApp Link Generator
Create a wa.me click-to-chat link with a pre-filled message, plus a QR code and an HTML button for your site.
Invisible Character (Blank Text)
Copy invisible and blank characters for empty names, messages and bios, and keep line breaks in Instagram captions.
Social Media Character Counter
Check a post against the limits of X, Threads, Bluesky, Mastodon, Instagram, TikTok, LinkedIn, Facebook, YouTube and Pinterest, plus SMS parts.
Break-Even Calculator
Find how many units you must sell to cover fixed costs or reach a target profit, with contribution margin, margin of safety and a profit table.
Sample Size Calculator
Work out how many visitors an A/B test needs per variant, or how many survey responses you need for a margin of error, with test duration.
A/B Test Significance Calculator
Check whether an A/B test result is statistically significant, with the p-value, confidence interval, relative lift and a sample ratio mismatch check.
CPM, CPC and CPA Calculator
Calculate CPM, total ad cost or impressions, then CTR, cost per click, cost per acquisition and conversion rate from the same campaign numbers.
ROAS Calculator
Calculate return on ad spend, the break-even ROAS for your margin, profit after ads, cost per order and break-even CPA.
Freelance Hourly Rate Calculator
Work out the minimum hourly and day rate you need as a freelancer from your target income, expenses, taxes and billable hours.
Engagement Rate Calculator
Calculate the engagement rate of social media posts by followers, reach or impressions from likes, comments, shares and saves.
NPS Calculator (Net Promoter Score)
Calculate your Net Promoter Score from counts or raw 0โ10 answers, with the margin of error and the score distribution.
LTV to CAC Calculator
Calculate customer lifetime value from revenue, margin and churn, compare it with acquisition cost, and get the LTV:CAC ratio and payback period.
Thread Splitter
Split long text into numbered posts for X, Threads, Bluesky or Mastodon at sentence breaks, ready to copy one by one.