utilapp.net

Free Online Developer Tools

Privacy-focused utilities that run entirely in your browser. No sign-up required. No data ever leaves your device.

JSON formatter, UUID generator, Base64 encoder/decoder, date converter, and more. All tools are free, fast, and work offline.

Developer Tools

Essential utilities for developers, designers, and anyone working with data. Each tool is optimized for speed and privacy.

Date Time Format Converter

Convert dates between formats like ISO 8601, Unix timestamps, and custom patterns. Perfect for developers working with APIs and databases.

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Our date time format converter supports ISO 8601, RFC 2822, Unix timestamps (seconds and milliseconds), and fully customizable date patterns. Whether you're debugging API responses, converting database timestamps, or formatting dates for display, this tool handles it all instantly in your browser.

ISO 8601Unix timestampRFC 2822date formattingtimestamp converter

Encoder / Decoder

Encode and decode files and text with Base64, Hex, Data URL, and URL encoding. Convert any file to encoded text or decode back to downloadable files.

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Transform files and text between multiple encoding formats including Base64, Hex, Data URL, and URL encoding. Perfect for encoding files for API payloads, embedding images as Data URLs, decoding Base64 strings back to downloadable files, or handling binary data. All conversions happen instantly in your browser.

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JSON Formatter & Validator

Format, validate, and minify JSON data with syntax highlighting. Debug API responses and configuration files with ease.

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Paste messy JSON and get beautifully formatted, syntax-highlighted output. Our JSON formatter validates your JSON in real-time, catching syntax errors instantly. Minify JSON for production, or expand it for readability. Perfect for debugging API responses, editing config files, or cleaning up JSON data.

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Image Format Converter

Convert images between PNG, JPEG, and WebP formats. Adjust quality and compare file sizes instantly.

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Convert images between popular formats including PNG, JPEG, and WebP. Adjust quality settings for lossy formats and see real-time file size comparisons. Perfect for optimizing images for web, converting screenshots, or preparing images for different platforms. All processing happens in your browser - your images never leave your device.

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Image Resizer & Compressor

Resize and compress images online. Set custom dimensions, maintain aspect ratio, and optimize file size.

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Resize images to exact dimensions or scale by percentage. Maintain aspect ratio for proportional scaling, choose output format, and adjust quality for optimal compression. Perfect for preparing images for social media, thumbnails, or web optimization. Your images stay private - all processing is done locally in your browser.

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QR Code Generator

Generate QR codes from text or URLs. Customize colors and download in PNG, JPEG, or SVG format.

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Create QR codes instantly from any text, URL, or data. Customize foreground and background colors, adjust size, and export in multiple formats including PNG, JPEG, and SVG. Perfect for sharing links, contact information, or any data that needs to be easily scannable. All QR codes are generated locally in your browser.

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Table Converter

Convert between CSV, TSV, and HTML table formats. Auto-detects delimiter and handles quoted fields correctly.

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Transform tabular data between CSV, TSV, and HTML table formats instantly. The converter auto-detects whether your input is comma or tab-separated, properly handles quoted fields with embedded delimiters, and generates clean output. Perfect for preparing data for spreadsheets, web pages, or databases. All processing happens in your browser.

CSV converterTSV converterCSV to TSVCSV to HTMLtable converter

File Hash & Checksum

Calculate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes for any file. Verify file integrity with instant checksum comparison.

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Generate cryptographic hashes and checksums for any file using MD5, SHA-1, SHA-256, SHA-384, and SHA-512 algorithms. Perfect for verifying file integrity, detecting file modifications, or generating hashes for security purposes. Compare calculated hashes against known values to ensure files haven't been tampered with. All processing happens locally in your browser.

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Unicode Escape Converter

Convert text to Unicode escape sequences and back. Supports JavaScript, HTML entities, CSS, Python, and Unicode code points.

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Transform text to and from various Unicode escape formats including JavaScript/JSON (\uXXXX), HTML decimal (&#XXXX;), HTML hex (&#xXXXX;), CSS (\XXXXXX), Python (\uXXXX, \UXXXXXXXX), and Unicode code point notation (U+XXXX). Perfect for handling special characters in code, debugging encoding issues, or working with internationalized text. View detailed character information including code points and Unicode block names.

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Password Generator

Generate secure random passwords with customizable length and character sets. Create strong passwords instantly for any account.

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Create cryptographically secure random passwords using your browser's built-in crypto API. Customize password length from 4 to 128 characters, choose character sets (uppercase, lowercase, numbers, symbols), and generate multiple passwords at once. See real-time password strength indicator. Perfect for creating strong, unique passwords for all your accounts. All passwords are generated locally - nothing is ever sent over the network.

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Word Counter

Count words, characters, sentences, and paragraphs instantly. Get reading time and speaking time estimates for your text.

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Analyze your text with comprehensive statistics including word count, character count (with and without spaces), sentence count, paragraph count, and line count. Get estimated reading time and speaking time for presentations. Perfect for writers, students, content creators, and anyone who needs to meet word count requirements. All processing happens instantly in your browser.

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Color Converter

Convert colors between HEX, RGB, HSL, and HSV formats. See live color preview and copy values with one click.

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Convert colors seamlessly between HEX, RGB, HSL, and HSV color formats. Enter any color value and instantly see conversions to all other formats. Live color preview shows exactly what your color looks like. Perfect for web developers, designers, and anyone working with digital colors. All conversions happen instantly in your browser.

color converterhex to rgbrgb to hexhsl convertercolor picker

Text Diff / Compare

Compare two texts side by side and see the differences highlighted. Find additions, deletions, and changes instantly.

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Compare two texts and instantly see what's been added, removed, or changed. Differences are highlighted with colors: green for additions, red for deletions. Perfect for comparing code versions, document revisions, or any text content. Use for code reviews, proofreading, or tracking changes in any text. All comparison happens locally in your browser.

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Regex Tester

Test regular expressions in real-time with match highlighting. See capture groups and learn regex patterns interactively.

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Test and debug regular expressions with instant match highlighting. Enter your regex pattern and test string to see all matches highlighted in real-time. View capture groups for each match. Supports all JavaScript regex flags (g, i, m, s, u). Perfect for learning regex, debugging patterns, or validating input formats. All processing happens locally in your browser.

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Why Choose UtilApp.net?

Built with privacy and performance as core principles. Here's what makes our tools different.

100% Client-Side Processing

All data processing happens entirely in your browser. Your sensitive data never leaves your device, making these tools safe for handling confidential information.

Works Offline

Once the page loads, all tools work without an internet connection. Use them on flights, in areas with poor connectivity, or anywhere you need reliability.

Ultra Lightweight & Fast

No bloated frameworks or heavy dependencies. Pages load instantly and tools respond immediately to your input, even on slower devices.

How It Works

1

Choose a Tool

Select from our collection of developer utilities above.

2

Paste Your Data

Enter or paste your data into the input field.

3

Get Results

See instant results processed entirely in your browser.

Frequently Asked Questions

Is my data safe when using these tools?

Absolutely. All tools run 100% in your browser. Your data is never sent to any server. You can verify this by using the tools with your network disconnected after the page loads.

Do I need to create an account?

No account or signup is required. All tools are completely free and available immediately without any registration.

Can I use these tools offline?

Yes! Once the page loads, all tools work offline. This makes them perfect for use during travel or in areas with unreliable internet.

What browsers are supported?

Our tools work in all modern browsers including Chrome, Firefox, Safari, and Edge. We use standard web APIs to ensure maximum compatibility.

Are these tools free to use?

Yes, all tools on UtilApp.net are completely free with no premium tiers or hidden costs. We support the site through non-intrusive advertising.

Built for Developers, By Developers

Whether you're debugging an API, preparing test data, or handling encoding issues, our tools help you get the job done quickly.

API Development

Format JSON responses, convert timestamps, encode Base64 payloads, and generate UUIDs for testing your APIs.

Database Work

Convert date formats for database queries, generate UUIDs for primary keys, and validate JSON configuration.

Web Development

Encode URL parameters, decode Base64 images, format JSON for configuration files, and handle character encoding.

Data Analysis

Clean up JSON data exports, convert between timestamp formats, and prepare data for import into other systems.