10 Tips to Create Strong Passwords That Hackers Can't Crack

Weak passwords remain the leading cause of account compromise. Here are 10 practical rules for creating passwords attackers cannot crack.

Length matters most

Aim for at least 16 characters. Each additional character exponentially increases brute-force time.

Mix character types

Combine uppercase, lowercase, numbers, and symbols to expand the keyspace.

Avoid dictionary words

Common words and predictable substitutions are tested first by attackers.

Use unique passwords per site

Reusing passwords means one breach compromises all your accounts.

Use a password manager

Tools like 1Password and Bitwarden generate and store strong unique passwords for every site.

How this guide is researched and fact-checked

This article is produced by the ToolKit Pro Developer Desk using ai-assisted research with human editorial verification against primary sources, and is checked by a human editor at the ToolKit Pro editorial desk before publication. Every number, formula and threshold quoted here is traced back to a primary standards body or health authority rather than to another blog, and each figure is re-computed with our own calculators so the worked examples and the live tools on this site always agree. When a definition changes — as with the 2019 SI redefinitions — the affected articles are re-checked and the “updated” date above is bumped.

Produced by: ToolKit Pro Developer Desk — Developer tools & data-format content
Method: AI-assisted research, human-verified against primary sources
Reviewed by: ToolKit Pro editorial desk (human review)
Last reviewed: 2026-08-19
Corrections: spotted an error? Tell us and we will fix and re-date the page.

Sources & further reading

BIPM — The International System of Units (SI Brochure)
NIST — Guide for the Use of the International System of Units
WHO — Body weight & health guidance

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