Explore practical guides by the problem you want to solve: customer links, QR campaigns, text, images, developer utilities and website checks.
You do not need to know a tool name to know what you want to accomplish. You might want a customer to find your menu, a workshop attendee to save the date, or a website image to fit an upload form. Start with that task, then choose the smallest useful tool.
This collection brings together practical r37dy guides with examples, checks and the limits to keep in mind. The public tools directory contains individual utilities; an account adds the link and page features available on your plan.
Three quick starting points
- I need one place for several destinations: start with the bio page guide.
- I need a printed item to open something on a phone: use the QR print guide.
- I need to transform or inspect a file, text or URL: find the specific task below or browse the tools directory.
Bring customers to the right place
Choose a guide for your actual audience: diners, clients, listeners, workshop participants or people who picked up a printed card. Each shows what information belongs on the destination and what to test.
- How to Make a Restaurant QR Menu That Guests Can Read
- Using QR Codes on Packaging for Product Instructions
- A Simple Link Page for Market Stalls and Craft Sellers
- What to Put on a Freelancer Portfolio Link Page
- Build a Music Release Link Page Fans Can Navigate
- Create a Podcast Episode Page with Useful Links and Notes
- Make a Creator Link Page That Helps Brands Send Better Enquiries
- Help Salon Clients Find the Right Booking Link
- Share Workshop Materials Without Losing People in a Group Chat
- A QR Information Page for Property Viewings
- Prepare Trade Show Follow-Up Links Before the Event
- Connect a Printed Portfolio to Videos and Full Case Studies
- Give a Community Project One Clear Information Link
- Plan a One-Page Campaign Before Building It
Plan and maintain a campaign
Start here when you have a link or QR campaign in mind but need to choose the format, repair an old route or make the results easier to interpret.
- Audit Your Old Links Before Launching a New Campaign
- QR Code Not Scanning? Check These Problems in Order
- Static vs Dynamic QR Codes: What Can You Change Later?
- Do You Need a Link in Bio Page or a Full Website?
- Use UTM Links to Distinguish Newsletter Campaigns
- A Campaign Link Naming System You Can Still Understand Later
Create useful communication links
Prepare a conversation starter, email draft, video reference or readable page address. These small tools help the next action make sense.
- Create a WhatsApp Enquiry Link with a Helpful Starting Message
- Create an Email Link with a Subject Line That Helps You Reply
- How to Link to a Specific Moment in a YouTube Video
- How to Choose a URL Slug That Will Still Make Sense Next Year
Prepare developer examples and content
Use these guides for structured data, documentation and test fixtures. They explain the difference between a text transformation and a working integration.
- How to Find and Fix Invalid JSON Before Using an API
- URL Encoding Explained with a Search-Parameter Example
- Base64 Encoding Is Not Encryption: A Practical Guide
- Convert Markdown to HTML and Check It Before Publishing
- How to Display HTML Code as Text Using Entities
- Remove HTML Tags Without Losing the Meaning of Your Text
- Format SQL Before Reviewing a Query
- Use UUID v4 Values for Test Records and Prototypes
- Unix Timestamps: Check Seconds, Milliseconds and Time Zones
Clean and organize text
Choose the operation that matches the list or copy you actually have. Keep an original and inspect the result before replacing it.
- Count Characters Before Publishing a Bio, Label or Description
- Change Text Case Without Breaking Names and Acronyms
- Remove Duplicate Lines from a List Without Losing Real Entries
- Alphabetize a List and Check the Order That Matters
- Extract URLs from Notes and Turn Them into a Reviewable List
- Change a List Separator Without Damaging the Items
Prepare images and brand assets
Choose a format and inspect the result based on the destination. A smaller file or different extension is only useful when the image still does its job.
- Optimize Website Images Without Making Them Look Worse
- PNG to JPG: Check Transparency Before You Convert
- Convert JPG to WebP and Compare the Result on Your Website
- Convert WebP to PNG When an Editor Will Not Accept the File
- Prepare a Favicon from Your Logo Without Losing Readability
- What Photo Metadata Can Tell You Before You Share an Image
- Convert a Brand Color Between HEX and RGB
Investigate a link or website problem
Follow the layer that matches the symptom: encoded QR content, redirects, page metadata, HTTP responses, DNS or certificates. One successful check is not a complete site audit.
- Read a QR Code from an Image Before Opening Its Destination
- Check Where a Short Link Goes Before Reusing It
- Check a Page Title and Meta Description Before Sharing It
- Read HTTP Response Headers When a Page Behaves Unexpectedly
- Use a DNS Lookup After Connecting a Domain
- Check a Website Certificate Before Sharing a New Link
Choose an account feature only when it fits the task
For saved bio pages, shortened links and QR codes, create a r37dy account and review the current allowance. File links, vCards, event links, static hosting and advanced controls require the relevant access. If your account does not include a feature, check the available options or contact r37dy before building a workflow around it.
Begin with one complete journey: a clear label, a working destination and a practical test. Add more complexity when it solves a real problem.