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AMToolsby HelloMarketing.in
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Developer & Design Tools

Developer and design utilities: JSON, CSV and YAML converters, Base64 and URL encoding, regex testing, cron expressions, CSS generators, minifiers, timestamps, IP and subnet tools, QR codes and image helpers.

86 tools in Developer & Design Tools

All free. No signup. Runs in your browser.

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ASCII Table & Character Lookup

Full ASCII table with character lookup. Find the decimal, hex, binary, and HTML code for any character.

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Aspect Ratio Calculator

Calculate aspect ratios and scaled dimensions for images, videos, and screens. Find missing width or height.

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Aspect Ratio Calculator

Calculate and maintain aspect ratios for images, videos, and screens. Find missing dimensions.

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Barcode Generator

Generate Code128, EAN-13, QR barcodes for products and inventory. Download as SVG or PNG for labels and printing.

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Base64 Encoder / Decoder

Encode or decode Base64 strings instantly. Supports URL-safe Base64 and file upload. Free online tool.

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Base64 Encoder / Decoder

Encode text or data to Base64 and decode Base64 strings back to plain text instantly.

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Base64 Encoder Decoder

Encode text or data to Base64 and decode Base64 strings back to plain text.

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Base64 Image Encoder

Convert images to Base64 string and back. Upload any image and get its data URL instantly.

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Binary to Text Converter

Convert text to binary code and binary back to text. Encode and decode ASCII text in binary (0s and 1s).

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Binary to Text Converter

Convert binary code to text and text to binary instantly. Free online binary translator supporting ASCII and UTF-8.

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Binary to Text Converter

Convert binary code to text and text to binary instantly. Supports ASCII and Unicode characters with bit-level breakdown.

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Binary Translator

Convert text to binary code and binary code to text. Instant binary translation online.

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Chmod Calculator

Calculate Linux file permissions. Convert between numeric (octal) and symbolic permission notation.

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Cron Expression Generator

Build and understand cron job expressions. Schedule tasks with a visual cron builder.

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Cron Expression Generator & Tester

Build and validate cron expressions visually. Get human-readable explanation of any cron schedule. Supports standard 5-field and extended 6-field…

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Cron Expression Parser

Parse and explain cron expressions in plain English. Validate cron syntax and see next run times.

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CSS Border Radius Generator

Generate CSS border-radius values visually. Create rounded corners, pills, circles. Copy border-radius CSS code.

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CSS Box Shadow Generator

Generate CSS box shadow code visually. Adjust blur, spread, offset, color and opacity. Copy box-shadow CSS instantly.

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CSS Box Shadow Generator - Visual Shadow Builder

Visually create CSS box shadow effects with live preview. Generate single or multiple box shadows with full control over offset, blur, spread, color…

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CSS Flexbox Generator

Visually build CSS flexbox layouts with live preview and copy-ready code.

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CSS Gradient Generator

Create beautiful CSS linear and radial gradients online. Copy the CSS code for your website.

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CSS Minifier & Beautifier

Minify CSS to reduce file size or beautify/format CSS code online. Free CSS optimizer tool.

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CSS Specificity Calculator

Calculate the specificity of any CSS selector instantly. Understand (a,b,c) notation and why styles override each other.

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CSS Text Shadow Generator

Generate CSS text shadow effects. Create glowing text, 3D text, embossed effects. Copy text-shadow CSS code.

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CSS Unit Converter

Convert between CSS units: px, rem, em, vw, vh, pt, cm, mm, in. Set base font size for accurate rem/em conversion.

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CSV to HTML Table Converter

Convert CSV data to an HTML table online. Free tool to generate clean, styled HTML tables from CSV or TSV data.

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CSV to JSON Converter

Convert CSV data to JSON format online. Paste CSV and get JSON array. Free online data converter.

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DNS Lookup Tool

Check DNS records for any domain. Look up A, CNAME, MX, TXT, NS, and other DNS record types online.

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Epoch Time Converter

Convert Unix/Epoch timestamps to human-readable dates and vice versa. Free online epoch time converter for developers.

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Epoch Timestamp Converter

Convert Unix epoch timestamps to human-readable dates and vice versa. Supports seconds and milliseconds.

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Favicon Generator

Create a simple favicon from text or emoji. Download as 32×32 PNG for your website.

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Font Pairing Tool

Find perfect font combinations for your design. Preview Google Fonts pairings for headings and body text.

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Font Size Converter

Convert between px, em, rem, pt, and vw font size units. Essential for web and print design.

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Hex Binary Decimal Converter

Convert between hexadecimal, binary, decimal and octal number systems instantly.

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Hex to Text Converter

Convert hexadecimal to text or text to hex online. Free hex encoder/decoder for developers and students.

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HTML Encoder / Decoder

Encode and decode HTML entities online. Convert special characters like <, >, & to HTML entities.

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HTML Encoder / Decoder

Encode and decode HTML entities online. Convert special characters to HTML entities and vice versa.

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HTML Table Generator

Generate HTML table code from your data. Paste CSV or enter rows manually.

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HTML to Markdown Converter

Convert HTML to Markdown online. Free tool to transform HTML code into clean Markdown syntax instantly.

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HTML to Plain Text Converter

Strip HTML tags and convert HTML to clean plain text. Remove markup, preserve line breaks, and extract readable content.

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HTTP Status Codes Reference

Complete reference for all HTTP status codes with explanations. Look up any status code quickly.

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Icon Finder & Reference

Find icons for your web and app projects. Browse popular icon libraries: Font Awesome, Material Icons, Bootstrap Icons.

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Image Dimension Calculator

Calculate new image dimensions when resizing while maintaining aspect ratio.

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Image Resizer (Client-Side)

Resize any image directly in your browser — no upload to server. Maintains aspect ratio. Download instantly.

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Image to Base64 Converter

Convert images to Base64 encoded strings for embedding in HTML and CSS. Supports PNG, JPG, GIF, SVG, and WebP.

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Image to Base64 Converter

Convert images to Base64 encoded strings for embedding in HTML, CSS, or emails.

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IP Address Info & Subnet Calculator

Look up IP address information and calculate subnet details, CIDR notation, and network ranges.

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IP Address Lookup

Find your public IP address and get detailed information about any IP including location, ISP, and timezone.

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IP Geolocation Lookup

Look up the location of any IP address. Find country, city, ISP, and timezone for any IPv4 address. Free online tool.

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IP Subnet Calculator

Calculate subnet mask, network address, broadcast address, and host range for any IP/CIDR.

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JavaScript Minifier

Minify JavaScript code online to reduce file size. Remove comments and whitespace from JS files.

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JavaScript Minifier

Minify JavaScript code online. Strip comments and whitespace to reduce JS file size for production.

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JSON Formatter & Validator

Format, validate, and minify JSON. Pretty-print with syntax highlighting and tree view.

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JSON Formatter & Validator

Format, beautify and validate JSON online. Minify JSON, fix JSON errors, and convert to readable format.

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JSON Minifier

Minify JSON online — remove whitespace and compress JSON data. Free JSON minifier and compressor tool.

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JSON to CSV Converter

Convert JSON data to CSV format online. Paste JSON array and download as CSV file. Free developer tool.

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JSON to CSV Converter — Convert JSON Array to CSV Online

Convert JSON array to CSV format instantly. Handles nested objects, arrays, custom delimiters. Download as .csv file. Free and client-side.

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JSON Validator & Formatter

Validate, format, and minify JSON instantly. See errors highlighted with line numbers.

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Markdown Editor & Preview

Write Markdown and see a live HTML preview. Supports headings, bold, italic, code, lists, and tables.

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Markdown to HTML Converter

Convert Markdown text to HTML online. Preview rendered Markdown in real time. Free markdown converter.

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My IP Address & Info

Find your public IP address, location, ISP and more. Get full IP geolocation details.

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Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal (base 2, 8, 10, 16) instantly.

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Number System Converter

Convert numbers between binary, octal, decimal, and hexadecimal. Essential tool for programmers and students.

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Octal Converter

Convert between octal, binary, decimal, and hexadecimal number systems. Instant multi-base conversion tool.

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Pixels to REM Converter

Convert between CSS pixels, REM, EM, and viewport units. Set your base font size.

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PX to REM/EM Converter

Convert CSS pixels to REM, EM, PT, and percent. Set your base font size and get accurate values for responsive design.

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QR Code Generator

Generate QR codes instantly for URLs, text, UPI IDs, phone numbers, and more. Free online QR maker.

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Regex Tester - Test Regular Expressions Online

Test and debug regular expressions online with live highlighting. Supports JavaScript regex with flags, capture groups, and match details.

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Screen & Display Information

Check your screen resolution, pixel density (PPI), color depth, and other display properties.

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Screen Resolution & Device Info

Detect your screen resolution, viewport size, pixel ratio, color depth, and browser info in real time.

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Screen Resolution Checker

Check your screen resolution, viewport size, pixel ratio, and display information online.

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Screen Ruler & Resolution Info

Measure pixels on screen, find your screen resolution, DPI, and aspect ratio.

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Sprint Velocity Calculator - Agile Scrum Planning Tool

Calculate your agile team sprint velocity, track story points completed per sprint, and forecast future sprint capacity for accurate project planning.

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SQL Formatter

Format and beautify SQL queries. Supports SELECT, INSERT, UPDATE, DELETE, and complex JOINs.

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Text Diff Checker

Compare two texts side by side and highlight differences. Find added, removed, and changed lines.

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Text Diff Checker

Compare two texts and highlight differences line by line. Find additions, deletions and changes.

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Text Diff Checker

Compare two texts side by side and highlight all differences. Shows insertions, deletions and unchanged text with character-level precision.

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Text to Hex Converter

Convert text to hexadecimal and hex back to text. View ASCII values, hex codes, and decimal values side by side.

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Unix Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa. Shows UTC and local time.

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Unix Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa. Get current timestamp in seconds and milliseconds.

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URL Encoder / Decoder

Encode and decode URLs and query strings. Convert special characters to percent-encoded format.

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URL Encoder / Decoder

Encode special characters for URLs or decode percent-encoded strings. Handles full URLs and query strings. Free tool.

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URL Parser

Parse and analyze any URL. Extract protocol, domain, path, query parameters, and fragment.

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Website Wireframe Planner

Plan your website layout with this simple wireframe tool. Organize sections and structure your web pages visually.

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What Is My IP Address

Find your public IP address, location, ISP and browser info instantly.

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YAML to JSON Converter

Convert YAML to JSON and JSON to YAML online. Validate YAML syntax and format output for APIs and config files.

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About Developer & Design Tools

Developer and design utilities: JSON, CSV and YAML converters, Base64 and URL encoding, regex testing, cron expressions, CSS generators, minifiers, timestamps, IP and subnet tools, QR codes and image helpers.

Processing happens in your browser, so code snippets, tokens and files stay on your device. Each page documents input formats and edge cases, such as how invalid JSON is reported.

AMTools is built and maintained by HelloMarketing.in. Every tool is free to use with no account or payment required. See our disclaimer and privacy policy.

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