Guides

Plain-English guides for the jobs our tools do. Read the how and why, then do it in one click.

QR code generator

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Cover image with the title "How to make a QR code for free (no signup, no expiry)" and the mktbox logoHow to make a QR code for free (no signup, no expiry)A step-by-step guide to making a styled QR code for free, without an account, a trial or a code that stops working next month.4 min readCover image with the title "How to make a QR code for your wifi password" and the mktbox logoHow to make a QR code for your wifi passwordLet guests join your wifi by scanning a QR code instead of typing a password. How it works on iPhone and Android, and how to make one for free.3 min readCover image with the title "Static vs dynamic QR codes: why "free" QR codes stop working" and the mktbox logoStatic vs dynamic QR codes: why "free" QR codes stop workingThe real difference between static and dynamic QR codes, why some free QR codes break after a trial, and how to choose the right one.3 min read

Email signature

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Cover image with the title "Email signature examples and templates that look professional" and the mktbox logoEmail signature examples and templates that look professionalWhat to include in a professional email signature, what to leave out, and examples for founders, marketers, freelancers and students you can copy.3 min readCover image with the title "How to add an animated GIF to your email signature" and the mktbox logoHow to add an animated GIF to your email signatureAdd a moving GIF banner or logo to your email signature in Gmail, Outlook and Apple Mail, and avoid the mistakes that break it or send emails to spam.3 min readCover image with the title "How to add an email signature in Gmail, Outlook and Apple Mail" and the mktbox logoHow to add an email signature in Gmail, Outlook and Apple MailStep-by-step instructions to add or change your email signature in Gmail, Outlook (web, Windows and Mac) and Apple Mail, with images and links that keep working.3 min read

Keyword ideas

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Cover image with the title "How to do keyword research for free" and the mktbox logoHow to do keyword research for freeA practical keyword research process that costs nothing, using Google's own suggestions, free tools and a simple way to pick the keywords worth targeting.4 min readCover image with the title "How to find the questions people ask on Google" and the mktbox logoHow to find the questions people ask on GoogleFind the real questions your audience types into Google, then turn them into content, FAQs and product messaging. Free methods, step by step.3 min readCover image with the title "YouTube keyword research: how to find what people search for" and the mktbox logoYouTube keyword research: how to find what people search forFind video topics people actually search for on YouTube, using YouTube's own suggestions and free tools, then title your videos so they get found.3 min read

Page speed audit

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Cover image with the title "How to test your website speed and fix what's slowing it down" and the mktbox logoHow to test your website speed and fix what's slowing it downRun a free website speed test, understand the results in plain English, and fix the issues that make the biggest difference first.4 min readCover image with the title "Core Web Vitals explained in plain English" and the mktbox logoCore Web Vitals explained in plain EnglishWhat LCP, INP and CLS actually measure, what good scores look like, and the practical fixes for each, without the developer jargon.3 min read

UTM builder

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Cover image with the title "What are UTM parameters? A simple guide with examples" and the mktbox logoWhat are UTM parameters? A simple guide with examplesWhat UTM parameters are, what each one means, real examples for social, email, ads and print, and how to build tagged links in seconds.3 min readCover image with the title "UTM naming conventions for Google Analytics 4" and the mktbox logoUTM naming conventions for Google Analytics 4A simple UTM naming system that keeps Google Analytics 4 reports clean, including the exact source and medium values GA4 expects for each channel.3 min read

Link preview

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Cover image with the title "Open Graph tags: how to control your link previews" and the mktbox logoOpen Graph tags: how to control your link previewsWhat Open Graph tags are, which ones you need, copy-paste examples, and how to check that LinkedIn, X, WhatsApp and Slack show your links the way you want.3 min readCover image with the title "Open Graph image size: the right dimensions for every platform" and the mktbox logoOpen Graph image size: the right dimensions for every platformThe best Open Graph image size for LinkedIn, Facebook, X, WhatsApp and Slack, plus file size limits and how to design a share image that isn't cropped.3 min readCover image with the title "Link preview not showing? How to fix it on LinkedIn, Facebook, WhatsApp and Slack" and the mktbox logoLink preview not showing? How to fix it on LinkedIn, Facebook, WhatsApp and SlackWhy your link preview is missing, shows the wrong image or an old title, and how to fix it and force each platform to refresh.3 min read

LinkedIn post formatter

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Cover image with the title "How to bold text on LinkedIn (plus italics, underline and lists)" and the mktbox logoHow to bold text on LinkedIn (plus italics, underline and lists)LinkedIn has no bold button, but you can still format posts with bold, italic and underlined text. Here's how it works, and when not to use it.2 min readCover image with the title "LinkedIn character limit and where "see more" cuts off your post" and the mktbox logoLinkedIn character limit and where "see more" cuts off your postLinkedIn's character limits for posts, comments, headlines and your About section, and exactly where the "see more" cut-off falls on phone and desktop.2 min read

Image resizer

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Cover image with the title "Social media image sizes 2026: the complete cheat sheet" and the mktbox logoSocial media image sizes 2026: the complete cheat sheetThe right image sizes for Instagram, LinkedIn, X, Facebook, YouTube, TikTok and Pinterest in 2026, in one table, plus how to resize one image for all of them.3 min readCover image with the title "Instagram image size 2026: posts, portrait, stories and reels" and the mktbox logoInstagram image size 2026: posts, portrait, stories and reelsThe right Instagram image sizes for feed posts, portrait posts, the 3:4 grid, Stories and Reels, and how to avoid blurry or cropped uploads.3 min read

Headline analyzer

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Cover image with the title "Email subject lines that get opened: examples and formulas" and the mktbox logoEmail subject lines that get opened: examples and formulasProven email subject line formulas with examples for newsletters, cold emails, launches and follow-ups, plus the mistakes that send emails to spam.3 min readCover image with the title "How to write headlines that get clicks" and the mktbox logoHow to write headlines that get clicksA practical guide to writing headlines for blog posts, landing pages, LinkedIn and ads, with formulas that work and a free way to score your headline before publishing.3 min read