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800+ Free, Fast, and 100% Private Web Utilities
Zero Server Uploads

All utilities run 100% locally in your web browser. Zero server uploads, zero data storage, zero tracking.

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Featured Utilities

High-demand tools running instantly in your browser

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Text & Writing Tools Processed in your browser
Text Difference Checker
Compare two text blocks side-by-side or line-by-line to find additions, deletions, and modifications.
Text & Writing Tools Processed in your browser
Word Counter
Real-time word, character, sentence, paragraph, reading time, and speaking time counter.
Text & Writing Tools Processed in your browser
Find and Replace
Search and replace words or patterns in text using plain text or regular expressions.
Text & Writing Tools Processed in your browser
Remove Duplicate Lines
Remove duplicate lines from text lists, trim empty whitespace, and sort results alphabetically.
Text & Writing Tools Processed in your browser
Slug Generator
Generate clean, URL-friendly slugs from strings with custom separators and punctuation stripping.
Text & Writing Tools Processed in your browser
Text Case Converter
Convert text to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, and kebab-case instantly.
Text & Writing Tools Processed in your browser
Readability & Flesch-Kincaid Score Calculator
Calculate Flesch Reading Ease, Grade Level, and sentence complexity breakdown.
Text & Writing Tools Processed in your browser
Side-by-Side Text Diff & Comparison Checker
Compare two texts side-by-side with split visual diffs and line-by-line highlight changes.

Browse by Category

Explore utilities grouped by function

Text & Writing Tools 32 tools
Fast client-side utilities for counting words, converting case, diffing text, cleaning duplicates, and generating slugs.
Developer Tools 130 tools
Essential browser utilities for software engineers: JSON prettifier, regex tester, UUID generator, and markdown previewer.
Structured Data Tools 38 tools
Two-way tabular conversion tools between CSV and JSON with automatic delimiter and type detection.
Encoding, Hashing & Cryptography 32 tools
Client-side Web Crypto and encoding utilities: Base64, URL encoding, HTML entities, SHA-256 hashes, and random password generator.
PDF & Document Tools 38 tools
Fast, private browser-based PDF utilities: merge, split, convert, rotate, and extract pages with zero server upload.
Color & Design Tools 49 tools
Palette generators, visual color picker, CSS gradient builders, and WCAG 2.1 accessibility contrast checker.
Image Tools 31 tools
HTML5 Canvas client-side image processing: resize, crop, compress, convert formats, and inspect/strip EXIF metadata.
Date & Time Tools 30 tools
Convert Unix epoch timestamps to human-readable ISO 8601 dates and timezones.
Math & Number Tools 78 tools
Everyday mathematical calculators and percentage helpers.
QR & Barcode Tools 34 tools
Generate custom QR codes instantly with customizable error correction and PNG/SVG download.
File & Data Tools 30 tools
Browser utilities for processing files, analyzing checksums, inspecting binary data, and converting archives.
Web & Frontend Tools 30 tools
Modern frontend development utilities for CSS layouts, HTML scaffolding, SVG manipulation, and UI components.
Finance & Business Tools 30 tools
Calculators and financial planners for investments, loan amortization, business runway, pricing, and accounting.
Unit Conversion Tools 33 tools
High-precision unit conversion tools for engineering, science, typography, computing, and everyday measurements.
Generators & Randomizers 30 tools
Procedural generators for test data, secure passwords, dummy text, mock avatars, and random numbers.
SEO & Webmaster Tools 30 tools
Webmaster utilities for robots.txt generation, XML sitemaps, Open Graph tags, canonical headers, and SERP previews.
Network & Internet Tools 30 tools
Network diagnostic calculators for IPv4/IPv6 CIDR prefixes, DNS records, cURL commands, and subnet masks.
Productivity Tools 30 tools
Everyday workflow accelerators including Pomodoro timers, meeting cost calculators, checklist builders, and habits.
Statistics & Data Analysis Tools 35 tools
Statistical calculations for standard deviation, normal distribution, z-scores, hypothesis testing, and regression.
Audio & Media Tools 30 tools
In-browser Web Audio API tools for sound generation, frequency analysis, audio editing, and metadata inspection.

Our Browser-First Privacy Promise

Most utilities on freeapps.best compute data strictly inside your browser using client-side JavaScript, Web Workers, and Web Crypto APIs. Your texts, JSON payloads, passwords, and photos never touch our servers unless clearly labeled otherwise.