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What is Frequency Analysis?

Free — no account needed

Frequency Analysis is one of our Security Tools. Crack substitution ciphers by analyzing letter, bigram, and trigram frequencies. Enter the address you want to look at and the report is built for you, finding in seconds what would take a long time to check by hand. It runs entirely in your browser, so nothing is uploaded and no account is needed. More in this collection: Encrypt and decrypt text with classic ciphers like Caesar, Vigenere, and Rail Fence.

How to use Frequency Analysis

  1. 1

    Open Frequency Analysis and enter the URL or domain you want checked.

  2. 2

    Run the check and wait a moment while the report is put together.

  3. 3

    Work through the findings — each one explains what it means and what to do about it.

Key Features

Itemised findings

Every issue is listed with what it affects and why it matters.

Checks in seconds

Covers in one run what would take a long time to verify manually.

Never leaves your browser

Processing happens on your own device — nothing is uploaded to us.

Works on any device

Full functionality on phone, tablet, and desktop.

Who Is This For?

SEO and marketing

Check a site before and after you change it.

Developers

Catch problems before they reach production.

Site owners

See what is wrong with your own site in plain language.

Frequently Asked Questions

Is Frequency Analysis free?

Yes. Frequency Analysis runs in your browser and is free to use, with no account, no watermark, and no usage cap.

Do I need to create an account?

No. Open the page and use it. An account only becomes useful if you want to save tools to your own toolbox.

What happens to my data?

Frequency Analysis does its work on your own device. Your input is never uploaded to us, which is why it also works with sensitive material.

How long does a check take?

Usually a few seconds. Checks that fetch several pages take a little longer, and progress is shown while it runs.

Do I need to install anything?

No. Frequency Analysis runs in the browser on desktop, tablet, and phone. There is nothing to download and nothing to keep updated.

More detail on plans is on our pricing page, and how AI-powered tools handle your data is covered on the AI processing page.

More Security Tools

Caesar Cipher
Encrypt and decrypt text using the classic Caesar shift cipher with visual alphabet wheel and brute force.
Rail Fence Cipher
Encrypt and decrypt text using the Rail Fence zigzag cipher with visual pattern display.
Vigenere Cipher
Encrypt and decrypt text using the Vigenere polyalphabetic cipher with full 26x26 table.
NATO Phonetic Alphabet
Convert text to and from NATO phonetic alphabet. Alpha Bravo Charlie with audio pronunciation.
Steganography
Hide secret messages inside images using LSB encoding. Optional password encryption.
Hidden Data Extractor
Extract hidden plain text, EXIF metadata, and LSB-steganographic messages from images, video, and audio files.
One-Time Pad Cipher
Mathematically unbreakable encryption using XOR with a random key.
Link Analysis Network
Map connections between people, places, and organizations with an interactive force-directed graph.
Timeline Investigator
Build detailed investigation timelines with events, evidence, and gap analysis.
Threat Assessment Matrix
Score and prioritize threats on a 5x5 likelihood vs impact risk grid.
Intelligence Report Writer
AI generates structured intelligence reports in SALUTE, INTSUM, or SITREP format.
Book Cipher
Encode and decode secret messages using any text as a shared key. A classic espionage technique.
Number Station Encoder
Encode and decode messages in Cold War-era number station broadcast format with audio playback.
Dead Drop Encoder
Hide secret messages inside innocent-looking text using steganographic techniques.
Access Review Checklist Generator
Generate access review checklists for user accounts, permissions, and system access audits.
Phishing Email Simulator
Generate realistic phishing email examples for security awareness training. Learn to spot red flags.
Open Port Scanner
Scan any website or IP for open ports. Detects HTTP, SSH, FTP, databases, and flags security risks.

API Keys

Generate API keys for programmatic access to AnythingText tools. Include X-API-Key header in your requests.

Generate New API Key

Your API Keys

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Quick Start

Use your API key in the X-API-Key header:

curl -X POST https://anythingtext.com/api/tools/case \
  -H "Content-Type: application/json" \
  -H "X-API-Key: atk_your_key_here" \
  -d '{"text": "hello world", "mode": "upper"}'

See API Documentation for all available endpoints.

How It Works

Three simple steps to transform your content. No signup required for most tools.

1

Choose a tool

Browse our catalog or search for exactly what you need. PDF, audio, AI, and developer tools — all in one place.

2

Upload or type

Drop a file, record audio, or paste your text directly. Most tools run in your browser — nothing to install.

3

Get results instantly

Download, copy, or share your results in seconds. Everything is fast, completely private, and free to use.