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Text Tools
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Word & Character Counter
Count words, characters, sentences and get estimated reading time instantly.
Case Converter
Convert text to UPPER, lower, Title, camelCase, snake_case and more.
Text Diff Checker
Compare two texts side by side and see exactly what changed.
Reverse Text
Reverse characters, words or lines in your text instantly.
Developer Tools
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JSON Formatter & Validator
Beautify and validate raw JSON data with syntax error detection.
Base64 Encoder / Decoder
Encode plain text to Base64 or decode Base64 strings back instantly.
URL Encoder / Decoder
Encode or decode URL components with percent-encoding support.
Regex Tester
Test and debug regular expressions with live match highlighting.
SEO Tools
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Keyword Density Analyzer
Calculate keyword density percentage for any text or webpage.
Readability Score
Calculate Flesch, Gunning Fog, SMOG and other readability metrics.
SERP Preview Simulator
Preview how your page looks in Google search results.
OG Meta Tag Generator
Generate Open Graph and Twitter Card meta tags for social sharing.
Security Tools
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Password Strength Checker
Analyze password strength with entropy score and security tips.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 and more hashes from any text.
Password Generator
Generate strong, random passwords with full control over length and character sets.
JWT Decoder
Decode and inspect JSON Web Token header, payload and signature.
Network Tools
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IP Address Lookup
Find your public IP address, country, city, ISP and location.
HTTP Status Code Reference
Browse all HTTP status codes from 1xx informational to 5xx server errors.
Subnet / CIDR Calculator
Calculate network address, broadcast, netmask and usable hosts from CIDR.
URL Parser
Break any URL into protocol, host, port, path, query string and fragment.
Calculators
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Simple Calculator
Perform basic arithmetic — add, subtract, multiply, divide right in your browser.
BMI Calculator
Calculate your Body Mass Index and see which health category you fall into.
Tip Calculator
Split restaurant bills evenly and calculate the perfect tip amount.
Mortgage Calculator
Estimate monthly payments, total interest paid and full amortization schedule.
Image & Media
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QR Code Generator
Generate QR codes from any text or URL — download as PNG.
Color Palette Generator
Generate a full 9-shade scale, complementary, analogous and triadic colors from any hex.
Image to Base64 Converter
Convert any image file to a Base64-encoded data URI string.
Favicon Generator
Design and download a custom favicon from text or emoji.
Writing Tools
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Word & Character Counter
Count words, characters, sentences and get estimated reading time instantly.
Markdown ↔ HTML Converter
Convert Markdown to HTML with live preview, or convert HTML back to clean Markdown.
Title Capitalizer
Capitalize titles using AP, APA, MLA or Chicago style guide rules.
Reading Time Estimator
Estimate how long it takes to read any text at multiple reading speeds.
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How It Works
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Pick a Tool
Browse 87+ free tools by category or search for exactly what you need — no account required.
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Paste Your Input
Type or paste your text, URL, or data directly into the tool. Everything runs in your browser — fully private.
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Get Results Instantly
Results appear instantly. Copy, download, or share — it's that simple. Zero waiting, zero friction.
What We Offer
A Complete Toolkit for Everyday Tasks

Testrefy is a collection of 87+ free online tools designed for developers, writers, SEO professionals, webmasters, and anyone who needs quick answers without signing up. Every tool runs directly in your browser — no data leaves your device, no accounts are required, and everything is completely free.

Our tools span categories including text processing (word counter, case converter, text diff checker), developer utilities (JSON formatter, base64 encoder/decoder, regex tester), SEO analysis (keyword density checker, readability score, SERP preview generator), security tools (password strength checker, hash generator, JWT decoder), network tools (IP lookup, subnet calculator, URL parser), calculators (BMI calculator, mortgage calculator, tip calculator), image tools (QR code generator, image to base64 converter, color palette generator), writing aids (title capitalizer, syllable counter, markdown converter), and interactive games.

Unlike many tool websites, Testrefy does not track your usage, sell your data, or require an account. All processing happens client-side using JavaScript — your text, files, and data never touch a server. Built with Next.js, every tool is designed to be fast, accessible, and mobile-friendly.

Benefits
Why Use Testrefy?
100% Free Forever

Every tool on Testrefy is completely free. No premium tiers, no credit card required, no hidden limits.

No Signup Required

Start using any tool instantly. No account creation, no email verification, no login walls.

Privacy First

All processing happens in your browser. Your text, files, and data never leave your device.

Works Offline

Once loaded, many tools continue working even without an internet connection.

Mobile Friendly

Every tool is responsive and works on phones, tablets, and desktops.

Fast & Lightweight

Built with Next.js and optimized for performance. Tools load instantly and respond in real time.

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FAQ
Frequently Asked Questions
Why does my word count differ from Microsoft Word?
Word processors count hyphenated words and contractions differently. This tool counts each whitespace-separated token as one word, which is the standard for most writing platforms.
How do I generate a strong password that I can actually remember?
Use Passphrase mode in the Password Generator. It combines real words with a separator and number, giving you something like "tiger-ocean-castle-91" which is both strong and memorable.
Do the tools work offline?
Yes. Once the page has loaded, all processing happens in your browser. You can disconnect from the internet and the tools will continue working until you close the tab.
Can I use these tools commercially — for client work or in a product?
Yes. All tools are free to use for any purpose including commercial work. There are no restrictions on usage, no attribution required, and no API keys needed.
Why does Base64 encoding make my file larger?
Base64 encodes every 3 bytes of binary data into 4 ASCII characters, which increases size by approximately 33%. This is expected behaviour — it is a trade-off for compatibility with text-based systems.
What is the difference between hashing and encryption?
Hashing is one-way — you cannot reverse a hash back to the original input. Encryption is two-way — you can decrypt it with the right key. Use hashing for passwords and checksums, encryption for data you need to recover.