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How to Add Line Numbers to Text (3 Ways)
Referencing line 42 of a file is easier with actual numbers. Here's how to add them — plus a free online tool.
Blog
Tips, guides, and tutorials for our free online tools.
Developer
JSON vs YAML: Which One Should You Use?
YAML is cleaner for config, JSON is better for APIs. Here's when to use each — and a free converter for both directions.
SEO
Open Graph Tags: Fix Broken Link Previews on Social
Link previews looking wrong on Facebook or Slack? Here's how to debug Open Graph tags — and a free previewer.
Generators
Random Strings: How to Generate API Keys and Tokens
Need an API key, session token, or test password? Here's how to generate secure random strings — with a free tool.
Developer
Markdown to HTML: Convert Without Losing Formatting
Converting Markdown to HTML shouldn't mangle your tables or code blocks. Here's how to do it right — with a free tool.