Is Practical Web Tools really free?

Yes, all 300+ tools are completely free with no hidden costs. There are no premium tiers, no usage limits, and no subscriptions. The AI chat feature is also 100% free because it runs on your own computer using Ollama.

Are my files uploaded to your servers?

No. All file processing happens directly in your browser using WebAssembly technology. Your files never leave your device. This makes Practical Web Tools ideal for sensitive documents like contracts, medical records, and financial statements.

What file formats can I convert?

Practical Web Tools supports PDF conversion (to Word, Excel, PowerPoint, images, text), image formats (JPG, PNG, WebP, HEIC, GIF, BMP), audio formats (MP3, WAV, FLAC, OGG, M4A, AAC, OPUS), and document compression (ZIP, 7Z, GZIP, RAR).

How does the free AI chat work?

The AI chat uses Ollama, a free open-source tool that runs AI models locally on your computer. After a one-time setup (about 5 minutes), you can chat with models like Llama 3.2 and Mistral completely offline. Your conversations are never sent to any external servers.

Do I need to create an account?

No account or signup is required. All tools work immediately with no registration. For AI chat, you just need to install Ollama once on your computer.

Is there a file size limit?

Most tools handle files up to 100MB. Since processing happens locally in your browser, the actual limit depends on your device's memory. For very large files, we recommend using our Split PDF or Compress Files tools first.

Does it work on mobile devices?

Yes. All file conversion tools work on smartphones and tablets. The AI chat feature requires a desktop computer (Windows, Mac, or Linux) because Ollama needs to run locally.

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Free Statistics Calculator

Name: Free AI Chat - Offline AI Assistant with Ollama
Rating: 4.9 (256 reviews)
Author: Practical Web Tools

Calculate comprehensive statistics including mean, standard deviation, variance, and more.

Files Never Leave Your DeviceInstant ProcessingNo Watermarks

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Quick Answer

Statistics measures: Mean (average), Standard Deviation (spread), Variance (SD²). 68% of normal data within 1 SD of mean.

Key Facts about Statistics Calculator:

Mean = sum/count
Variance = average squared deviation
Standard deviation = √variance
68% within 1 SD (normal)
Sample SD uses n-1

Why Use Our Statistics Calculator?

Statistics tools:

📊

Full Statistics

All descriptive stats.

📈

Graphs

Visual distributions.

🔢

Sample/Population

Both formulas.

📐

Percentiles

Quartiles and more.

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Instant

Quick results.

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Private

Data stays secure.

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How to Statistics Calculator in 3 Easy Steps

Calculate stats:

Enter Data

Your dataset.

Calculate

Process all stats.

View Results

See all measures.

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Why Use Our Calculator?

Comprehensive stats

Visual output

Both formulas

Instant results

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📊

Statistics

Complete data analysis

Common Use Cases for Statistics Calculator

Perfect for:

Research

Data analysis.

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School

Statistics homework.

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Business

Data insights.

Compute

Frequently Asked Questions

Everything you need to know about our statistics calculator

What is standard deviation?

Measures how spread out data is from the mean. Low SD = clustered, high SD = spread out.

Still have questions? Try the tool yourself!

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