Free Online Security Tools
Use free security tools to check password strength, generate secure passwords, create hashes, inspect JWTs, encode data, and prepare safer privacy workflows.
Best Security Tools to Start With
Start with the security tools used most often for everyday checks: test password strength, generate stronger passwords, create hash values, inspect JWTs, compare SHA or MD5 output, encode or decode strings, and censor sensitive screenshot details.
Password Strength Checker
Test how secure your password is — get an entropy score, estimated crack time, and actionable tips.
Password Generator
Generate cryptographically secure random passwords using crypto.getRandomValues() — customizable length, character sets, and entropy calculation.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text.
JWT Decoder
Decode and inspect JSON Web Tokens (JWT) without validation.
SHA Hash Generator
Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from text instantly in your browser.
MD5 Generator
Instantly generate MD5 hashes from any text for checksums and data verification.
Photo Censor
Blur or pixelate sensitive information in photos.
Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 to plain text — with URL-safe mode, auto-detect, and size stats.
Security Tools by Use Case
Browse tools grouped by what you need to get done.
Password and Strength Tools
Password tools help create stronger random credentials and check whether an existing password looks weak, predictable, or too short. They are useful for account setup, training, QA, and security education, but they are not a replacement for a password manager or organization-wide credential policy.
Hashing and Checksum Tools
Hashing tools create one-way hashes and checksums for comparison, development, file verification, and test workflows. Hashing is not encryption, and weak hashes such as MD5 should not be used for password storage or security-critical systems.
JWT and Token Inspection Tools
JWT tools help developers inspect token headers, payloads, claims, and expiry values while debugging authentication flows. Decoding a token is not the same as verifying trust. Avoid pasting live production tokens, admin tokens, customer secrets, private keys, or session credentials into any online utility.
Encoding and Data Safety Tools
Encoding tools help inspect reversible formats such as Base64 and URL-safe strings. They are useful for debugging payloads and transport formats, but encoding should not be treated as privacy protection because encoded values can be decoded by anyone.
Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 to plain text — with URL-safe mode, auto-detect, and size stats.
URL Encoder/Decoder
Encode and decode URL strings with special characters.
String Escape / Unescape
Escape or unescape strings for JSON, JavaScript, HTML, URL, CSV, and RegEx contexts — instantly.
Privacy Cleanup Tools
Privacy cleanup tools help prepare safer screenshots, images, and shared assets. Blur or pixelate sensitive areas before posting support images, documentation screenshots, or public bug reports. This reduces accidental exposure but does not replace careful review of the entire file.
All Security Tools
1 free tool — no sign-up required.
Why Security Tools Matter
Handle common security and privacy tasks with free browser-based tools for password strength checks, password generation, hash generation, JWT inspection, Base64 encoding, and hiding sensitive image details. These utilities help developers, admins, QA teams, students, and privacy-conscious users complete quick checks without setting up a full security toolkit.
Security workflows often span multiple categories. A developer might generate a password, check its strength, decode a JWT, compare a hash, inspect Base64-encoded content, and censor sensitive screenshot details during the same debugging or documentation session.
Use these tools with realistic limits. They can help inspect, generate, and compare values, but they do not replace a password manager, secure backend authentication, key management, penetration testing, incident response, or a professional security audit. Do not paste live secrets, production tokens, private keys, or customer credentials into any online tool.
Start with Password Strength Checker and Password Generator for credential workflows, Hash Generator for checksums and comparisons, JWT Decoder for auth debugging, and Photo Censor when screenshots need privacy cleanup before sharing.
Security Tool Collections
Grouped workflows that connect security tools to adjacent tasks.
Security & Privacy Kit
Use free browser-based security and privacy tools for password generation, password strength checks, hash generation, JWT decoding, Base64 decoding, and hiding sensitive image data.
API & Backend Pack
Use free API and backend developer tools for JSON formatting, JWT decoding, SQL formatting, HTTP status codes, cron expressions, Base64, URL encoding, UUIDs, and webhooks.
Image Studio
Compress, resize, convert, crop, optimize SVGs, create favicons, extract colors, and prepare website images — all processed locally in your browser.
Security FAQ
Common questions about security tools and how to use them.
What are online security tools?
Online security tools help with practical tasks such as checking password strength, generating passwords, creating hashes, decoding JWTs for debugging, inspecting encoded data, and censoring sensitive screenshots. They are utilities for quick checks, not a complete security program.
Can I check password strength online?
Yes. Password Strength Checker analyzes password length, character variety, and predictability signals to estimate how strong a password appears. Do not test real passwords that protect important accounts in any online tool.
Can I generate secure passwords?
Yes. Password Generator creates random passwords with configurable length and character options. Store generated passwords in a password manager and follow your normal account security practices, including unique passwords and multi-factor authentication where available.
Can I generate hashes online?
Yes. Hash Generator, SHA Generator, and MD5 Generator can create hash outputs for text, checksums, comparisons, and development tests. Hashing is one-way, not encryption, and MD5 should not be used for secure password storage.
Can I decode JWT tokens safely?
JWT Decoder can inspect token contents for debugging, but decoding does not verify the token signature or prove trust. Use only test or development tokens, and avoid pasting live production tokens, admin credentials, customer secrets, or private keys.
Can I hide sensitive information in screenshots?
Yes. Photo Censor can blur or pixelate selected areas of an image before sharing. Review the whole screenshot before publishing because hidden details can also appear in filenames, browser tabs, metadata, surrounding text, or other visible UI areas.
Are these security tools a replacement for an audit?
No. These tools help with everyday checks and development workflows, but they do not replace a full security audit, threat modeling, penetration testing, secure coding review, password manager, or properly designed authentication system.