Best Free Online Developer Tools to Use in 2026
A practical, opinionated list of the best free online developer tools worth using in 2026, organized by category so you can find what you need fast.
Aug 08, 2026
Double Dagger is a game symbols, card suits, dingbats, and decorative glyphs. This HTML entity enables web developers to display this character reliably across all browsers without encoding issues.
U+2021
‡
\2021
Use this HTML entity in decorative text, game-related content, and visual elements. For example, ♠ ♥ ♣ ♦ for card suits.
Mistake: Using two single daggers instead of one double dagger character
Fix: The double dagger ‡ is a single Unicode character. Using †† (two single daggers) is not the same and looks different in most fonts.
Select any code to highlight it before copying.
| Unicode | U+2021 |
|---|---|
| Hex Code | ‡ |
| HTML Code | ‡ |
| HTML Entity | ‡ |
| CSS Code | \2021 |
| Windows Shortcut | Alt 0135 |
| Mac Shortcut | ⇧⌥Y |
Blog
A practical, opinionated list of the best free online developer tools worth using in 2026, organized by category so you can find what you need fast.
Aug 08, 2026
A practical decision guide to choosing the right hash algorithm: MD5, SHA-1, SHA-2, SHA-3, bcrypt, argon2, PBKDF2, and SRI, with comparisons and clear recommendations.
Aug 08, 2026
A thorough, practical comparison of hand-written CSS and Tailwind CSS: learning curve, maintainability, performance, team workflows, and when each approach wins.
Aug 08, 2026
Learn practical, step-by-step techniques to improve LCP, INP, and CLS on your website. A developer-focused guide with real measurements and fixes.
Aug 08, 2026
Learn practical, production-ready ways to use Base64 encoding: data URLs for images, JWT payloads, API tokens, and email attachments, with real code examples.
Aug 08, 2026
Learn how AES encryption works, the differences between AES-128, AES-192, and AES-256, and how to encrypt and decrypt data online.
Jun 23, 2026