Tech & Digital
Browse all 68 tech & digital tools
What is tech and developer tools?
Tech and developer tools are browser-based utilities that help designers, developers, and technical users with everyday tasks — from generating CSS code and converting colors to formatting JSON, decoding JWT tokens, and calculating network bandwidth — all without installing software.
ASCII Converter
Convert text to ASCII codes and back. Supports decimal, hex, binary, and octal formats.
Aspect Ratio Calculator
Convert width/height to aspect ratios, scale dimensions, and generate responsive embed CSS for any layout.
Bandwidth Calculator
Calculate required internet bandwidth based on devices and activities in your household.
Base64 Encoder/Decoder
Encode and decode Base64 strings. Convert text for data URIs, APIs, and safe data transmission.
Border Radius Generator
Create CSS border-radius with visual controls for each corner. Generate circles, pills, and custom shapes.
Box Shadow Generator
Create CSS box shadows with multiple layers, live preview, and copy-ready code.
Color Blindness Simulator
Preview how colors appear with different types of color blindness. Test accessibility for color vision deficiency.
Color Converter
Convert colors between HEX, RGB, HSL, and OKLCH. Includes alpha support and copy buttons for CSS-ready formats.
Color Palette Generator
Create harmonious color schemes from a base color. Generate complementary, analogous, triadic, and more.
Color Picker
Pick any color and get HEX, RGB, HSL, and CMYK values with one-click copy.
Cron Expression Generator
Build cron schedules interactively with human-readable descriptions and next run previews.
CSS Animation Generator
Create CSS keyframe animations visually with timing controls and live preview.
CSS Clamp() Generator
Generate clamp() values for fluid type and spacing. Set min/max sizes, breakpoints, and copy ready-to-use CSS.
CSS Filter Generator
Create CSS filter effects with blur, brightness, contrast, grayscale, and more with live preview.
CSS Flexbox Generator
Create flexbox layouts visually with live preview. Configure container and item properties.
CSS Grid Calculator
Calculate column widths from container size, columns, and gutter. Great for layout planning and design-to-dev handoff.
CSS Transform Generator
Create CSS transforms visually. Configure translate, rotate, scale, skew with live preview.
Data Storage Converter
Convert between GB, TB, MB, KB, and more. Quick reference for common storage sizes.
Data Transfer Rate Converter
Convert between Mbps, Gbps, MB/s, and more. Calculate download times for any file size.
Diff Checker
Compare two texts and highlight differences. See added, removed, and unchanged lines.
Download/Upload Speed Calculator
Calculate download times based on file size and connection speed. Convert Mbps to MB/s.
Favicon Generator
Generate favicons from images or text. Preview at multiple sizes and download as ICO or PNG.
File Size Converter
Convert between bytes, KB, MB, GB, TB and binary units. Understand decimal vs binary file sizes.
Font Pairing Tool
Preview curated Google Font pairings with live text and copy-ready CSS snippets.
Google Ads Revenue Calculator
Estimate clicks, conversions, revenue, ROAS, CPA, and net profit from your Google Ads budget.
Gradient Generator
Create CSS linear, radial, and conic gradients with multiple color stops and live preview.
Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes for text and verification.
HTML Character Entities
Searchable reference for HTML entities, numeric codes, and hex codes for every special character.
HTML Entity Encoder
Encode and decode HTML entities. Convert special characters for safe HTML display.
Image Format Converter
Convert images between PNG, JPG, WEBP, and GIF formats. Adjust quality and compare file sizes.
Image Generation Aspect Presets
Pick social sizes and aspect ratios for image generation. Copy prompt snippets and recommended dimensions for each platform.
Image Resizer
Resize, crop, rotate, and compress images. Change aspect ratios and convert between formats.
JSON Formatter & Validator
Format, validate, and minify JSON. Find syntax errors and prettify with proper indentation.
JSON to CSV Converter
Convert JSON arrays to CSV format and CSV to JSON. Handles nested objects and auto-detects types.
JWT Decoder
Decode and inspect JSON Web Tokens. View header, payload claims, and expiration status.
Markdown Preview
Write and preview Markdown in real-time. Supports GFM with tables, task lists, and code blocks.
Meta Tag Generator
Generate SEO, Open Graph, and Twitter Card meta tags with live Google/social previews.
npm Package Prompts
Browse popular npm packages by category and copy install commands with one click.
Number Base Converter
Convert between binary, decimal, hexadecimal, and octal number systems.
OpenGraph Preview
Preview how your links appear on Facebook, Twitter, LinkedIn, and Slack with Open Graph tags.
PDF Compressor
Compress PDF files by optimizing images and stripping metadata. Private, browser-based processing.
PDF Form Filler
Fill in fillable PDF form fields online. Auto-detects text, checkbox, dropdown, and radio fields.
PDF Merger
Combine multiple PDF files into one document. Reorder, preview page counts, and download instantly.
PDF Page Organizer
Reorder, rotate, and delete PDF pages with drag-and-drop. Fully browser-based.
PDF Password Protector
Encrypt PDFs with user and owner passwords. AES-256 encryption, fully browser-based.
PDF Splitter
Extract specific pages or split every page into separate PDFs. Private, browser-based processing.
PDF to Image Converter
Export PDF pages as PNG or JPEG images. Adjust resolution, preview thumbnails, and batch download.
PDF Watermark
Add text or image watermarks to PDF pages. Customize opacity, rotation, and position.
Placeholder Image Generator
Generate custom placeholder images with configurable size, colors, and text. Download as SVG or PNG.
PX <-> REM <-> EM <-> INCHES Converter
Convert px to rem, em, and inches instantly. Adjust root font-size, context font-size, DPI, and rounding. Quick reference tables included.
Regex Tester
Test regular expressions with real-time matching, flags, and highlighted results.
Robots.txt Generator
Generate valid robots.txt files with presets, custom rules, and sitemap references.
Roman Numeral Converter
Convert between decimal numbers and Roman numerals (I, V, X, L, C, D, M).
Screen Resolution Calculator
Calculate PPI, pixel density, and aspect ratio for any screen resolution and size.
Spacing Scale & Tokens Generator
Generate 4pt/8pt spacing scales and export token names/values. Includes Tailwind-friendly outputs for fast setup.
Special Characters & Shortcuts
Find and copy special characters, symbols, and keyboard shortcuts for Mac and Windows.
SQL Formatter
Auto-format and beautify SQL queries with proper indentation and keyword uppercasing.
Subnet/IP Calculator
Calculate subnet masks, network ranges, and usable hosts from IP addresses and CIDR notation.
SVG Converter
Convert SVG to PNG/JPG/WEBP or trace raster images to SVG. Batch support and ZIP download.
Tailwind CSS Generator
Visual builder for common Tailwind CSS patterns with live preview and copy.
Text Transform
Convert text to uppercase, lowercase, title case, sentence case, slug format, and more.
Type Scale Generator
Build a modular type scale with headings/body presets, responsive steps, and token-friendly output for design systems.
Unix Timestamp Converter
Convert Unix timestamps to dates and dates to timestamps. Supports seconds and milliseconds.
URL Encoder/Decoder
Encode and decode URLs and query strings. Convert special characters for safe URL transmission.
UUID Generator
Generate random UUID v4 identifiers for databases, APIs, and development.
Video Bitrate Calculator
Calculate video file sizes from bitrate or find required bitrate for target size.
WCAG Contrast Checker
Check text/background contrast for WCAG compliance. Get AA/AAA results and suggested color tweaks that pass.
Word & Character Counter
Count words, characters (with/without spaces), sentences, and reading time. Track remaining characters for common limits.
Formula & Methodology
Did you know? JSON (JavaScript Object Notation) was specified by Douglas Crockford in 2001 and has become the de facto standard for data interchange on the web, replacing XML in most modern APIs. The official MIME type is "application/json" per RFC 8259.
Sources
- World Wide Web Consortium (W3C) — CSS specifications and accessibility guidelines
- Internet Engineering Task Force (IETF) — RFC 8259 (JSON) and RFC 3986 (URL encoding) standards