Security & Privacy Tools
Security tools that keep secrets where they belong: on your device. Generate strong passwords and keys, encrypt and decrypt text and files, and check what information you might be sharing.
All 35 security tools
Grouped by what they do.
Passwords & 2FA
9 toolsCreate and check passwords and one-time codes.
- Password Strength Checker How long would your password survive an attack? Find out without it leaving your device.
- Passphrase Generator (Diceware) Memorable random passphrases from the EFF word lists — or from your own dice.
- Pwned Password Checker See if a password has leaked in a data breach — without sending the password.
- Bcrypt Hash Generator & Verifier Create and verify bcrypt hashes in your browser, with timing and the 72-byte check.
- Password Protect PDF Lock a PDF with a password and choose what others may print, copy or change. Pro tool
- Unlock PDF (Remove a Password You Know) Type the password once and save a copy of the PDF that opens without it. Pro tool
Show all 9 Show fewer Passwords & 2FA tools
- TOTP / HOTP Code Generator Live 2FA codes from a secret, setup QR codes and authenticator backups, on your device.
- Argon2 Hash Generator & Verifier Argon2id hashes with OWASP and RFC 9106 settings, made and checked on your device.
- .htpasswd Generator Password lines and config for Apache and nginx Basic authentication, made on your device.
Encrypt & hash
6 toolsKeep text and files private, and fingerprint data.
- Encrypt / Decrypt Text (AES-256) Password-protect a message, send it anywhere, decrypt it here — even offline.
- File Encryption & Decryption Lock any file with a password — big files too — and unlock it on any device.
- HMAC Generator Keyed hashes for API and webhook signatures — compute, verify and get the code.
- PGP Encrypt / Decrypt OpenPGP encryption, decryption, signatures and key details — nothing leaves your device.
- AES Encryption Tool (Developer) AES-GCM, CBC and CTR with raw keys, for test vectors and interoperability debugging.
- Password-Protected ZIP Creator AES-256 encrypted ZIP archives made and opened on your device.
Keys, certificates & tokens
6 toolsCreate, convert and check keys, certificates and tokens.
- SSL Certificate Decoder Paste a certificate, a chain or a CSR: every field decoded, every problem explained.
- CSR Generator A key and a CSR for your SSL certificate, made on your device — the key never leaves it.
- RSA Key Pair Generator RSA key pairs in every format — PEM, JWK, SSH — made in your browser, self-tested.
- API Key & Secret Generator Cryptographically random API keys and framework secrets, made only on your device.
- PGP Key Generator Your own PGP key pair, with revocation certificate, made privately in your browser.
- Elliptic Curve Key Generator (ECDSA / Ed25519 / X25519) EC key pairs in PEM, JWK, raw hex and OpenSSH formats, generated in your browser.
Web & email security
5 toolsConfigure and check how websites and domains defend themselves.
- Content Security Policy (CSP) Generator Build a strict, working CSP with hashes, reporting and ready-to-paste server config.
- Security Headers Checker Grade a site’s security headers A+ to F and get copy-paste fixes for your server.
- SPF Record Checker Find out which servers may send mail for a domain — and why yours might fail.
- DMARC Record Checker See what receivers do with mail that fails DMARC — and how to get to reject.
- DKIM Record Checker Is your DKIM key published, strong enough and usable? Check any selector.
Privacy & safety checks
5 toolsCheck what is safe and remove what you would rather not share.
- Email Header Analyzer Trace where an email came from, and whether it is really from its sender.
- Suspicious Link Checker See where a link really goes, and the tricks it uses, without opening it.
- PII Redactor (Mask Personal Data) Hide personal data in logs, tickets and prompts: masked, tagged or swapped for stand-ins.
- Text Redactor (Mask Personal Data) Hide personal data behind placeholders like [EMAIL_1], then put it back in the reply.
- Unicode Character Inspector Paste text to see each character — and the invisible or look-alike ones hiding in it.
Classic ciphers & encodings
4 toolsHistoric ciphers and simple encodings, for learning and puzzles.
- Vigenère Cipher Encoder & Decoder Encrypt with a keyword, decrypt, or let Kasiski and Friedman find a lost key.
- Caesar Cipher Encoder & Decoder Shift letters by any amount — or let frequency analysis find the shift for you.
- ROT13 / ROT47 Encoder & Decoder Rotate letters, digits or all printable ASCII — the same step encodes and decodes.
- Classic Cipher Toolkit Nine historic ciphers for puzzles and teaching, with the tools to break them.
No security tools match these filters.
Choose “Anything” in one of the filters, or look across every category on All tools.
Security tools A–Z
C
E
P
Collections with security tools
All collections →- 197 tools Developers JSON, YAML & data formats · Format, convert & run code · Encode, decode & hash · 5 more
- 107 tools Small business & tax Invoices & billing · GST, VAT & tax · Pricing, profit & stock · 4 more
- 66 tools Legal paperwork Agreements & contracts · Affidavits & declarations · Notices & complaints · 4 more
- 174 tools Students Grades, marks & exams · Essays & writing · Citations & references · 4 more
Good to know
- 29 of 35 tools run entirely in your browser; the other 6 explain on their pages what they send.
- 27 of 35 keep working without a connection once loaded.
- 8 of 35 tools use the network for part of their work; each one says on its page what it sends and where.
Other categories
All tools →- 132 tools Developer Format, validate, encode, decode.
- 40 tools Data CSV, Excel, tables, charts.
- 95 tools Text Count, clean, sort, compare.
- 92 tools Image Compress, resize, convert, crop.
- 55 tools PDF Merge, split, extract, convert.
- 35 tools Audio & Video Convert, trim, compress media.
- 56 tools Design Colours, gradients, CSS.
- 36 tools SEO Meta tags, sitemaps, schema.
- 27 tools Social Media Captions, previews, limits.
- 94 tools Finance Loans, savings, interest, tax.
- 78 tools Business Invoices, quotes, margins.
- 39 tools Legal Templates and legal maths.
- 48 tools Health BMI, calories, pregnancy.
- 51 tools Math Calculators and solvers.
- 45 tools Science Physics, chemistry, astronomy.
- 31 tools Engineering Electronics, electrical, mechanical.
- 29 tools Construction Materials, area, home costs.
- 80 tools Education Grades, citations, study.
- 36 tools Network DNS, headers, IPs, subnets.
- 33 tools Converters Every unit, exact factors.
- 75 tools Utility Convert, count down, randomise.