Tool tutorials
Instructions for using browser tools and APIs.
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How to Check a Domain’s SPF, DKIM and DMARC With One API Call
Mail from a domain without SPF and DMARC lands in spam or gets spoofed. One GET request checks MX, SPF, DMARC, DKIM, MTA-STS, TLS-RPT and BIMI and returns a grade…
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How to Resize an Image Free with Image Resizer
The quickest free way to resize an image is to open Image Resizer, choose your photo, set the width or height you need, keep the aspect ratio locked, and download…
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How to Calculate YouTube Earnings Free with YouTube Money Calculator
The simplest free way to estimate YouTube earnings is to multiply your expected views by an RPM range, while keeping long-form videos and Shorts separate. Avalon’s YouTube Money Calculator does…
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3 Free Tool Workflows to Try: Redirects, PDF to Word, and Web to Markdown
Explore three practical tool workflows with linked examples and steps you can follow. Choose the task you need, check the example, and try the relevant tool. 1. How to Trace…
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How to Convert Any Web Page to Clean Markdown for an LLM
Feeding raw HTML to a language model wastes tokens on menus, scripts and footers. One GET request returns the page's main content as Markdown, with its title, word count and…