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Free marketing tools online — no sign-up

The small jobs of every campaign: tag links so analytics attributes traffic correctly, check how a page looks in Google, social feeds and the inbox before it goes live, and prove the channel pays off. Each tool gives an answer in a minute and runs entirely in your browser.

● Free, no sign-upTools: 13

Tools in this collection

UTM builder
How do I build consistent UTM links for every campaign and channel?
Open Graph generator
Which Open Graph tags does the page need, and how will the link preview look?
SERP snippet preview
How will the title and description look in Google, and will they be cut off?
Email subject line preview
Will the subject line and preheader fit in the inbox on mobile and desktop?
UTM QR code generator
Which booth, flyer or poster brought visitors — and how do I tag a QR code for each one?
QR code generator
How do I make a QR code for a link, Wi-Fi or contact that never expires?
CAC payback period calculator
How many months until a new customer pays back its acquisition cost?
LTV and CAC calculator
Does a customer earn back what it cost to acquire them?
Trial-to-paid conversion calculator
How much revenue does a better trial-to-paid conversion add?
Viral coefficient (K-factor) calculator
Does each user bring enough new users for viral growth?
A/B test calculator
Is the difference between A and B significant, and how many users does the test need?
Readability checker
How hard is this text to read, and which sentences are too long?
NPS, CSAT and CES calculator
What is the Net Promoter Score of these answers, with a confidence interval?

When you need them

Before launching a campaign

Build UTM links with one naming convention, preview the search snippet, social card and email subject line so nothing is cut off or missing an image.

Offline: events, flyers, business cards

Make print-ready static QR codes that never expire, and tag every placement with UTM parameters so GA4 and Yandex Metrica show what worked after the event.

Proving that a channel pays off

Compare customer lifetime value with acquisition cost, see how many months CAC takes to pay back, and check whether referrals add real viral growth.

Testing messages and copy

Check whether a landing page or email variant really won, keep copy easy to read, and score what customers say about you.

FAQ

What free marketing tools does Clew offer?

A UTM builder, SERP snippet preview, Open Graph generator, email subject line preview, CAC payback, LTV:CAC, trial-to-paid and viral coefficient calculators, an A/B test calculator, a readability checker and an NPS calculator. All are free and need no account.

How do I build UTM links correctly?

Use utm_source for the platform, utm_medium for the channel type (cpc, email, social) and utm_campaign for the campaign, always in lowercase with the same separators. The UTM builder enforces a convention and builds links in bulk so reports do not split one source into several.

What is a good LTV to CAC ratio?

A common benchmark for SaaS is 3:1 or higher, with CAC paid back in under 12 months. A lower ratio means the channel spends too much per customer; a much higher one can mean you are underinvesting in growth.

How do I check if a marketing A/B test is significant?

Enter visitors and conversions for each variant in the A/B test calculator. It runs a two-proportion z-test, shows the p-value and confidence interval, and tells you how many visitors you still need if the result is not significant yet.

Why check the snippet and link preview before publishing?

Search engines truncate titles by pixel width and social networks cache the first preview they fetch. A cut title or a missing og:image lowers click-through, and fixing it after sharing often means waiting for the cache to refresh.

Is my campaign data sent anywhere?

No. The tools run in your browser. Inputs are stored only in the page URL so you can share the result with a colleague.