Online Developer Tools
A collection of free, open-source tools for developers, SEO experts, and marketers. Secure, fast, and privacy-focused.
Developer Tools
JSON Formatter & Validator
Format and validate JSON online free.
Base64 Encoder & Decoder
Encode text to Base64 or decode Base64 to plain text instantly.
UUID Generator (v4)
Generate random UUID v4 identifiers instantly.
Hash Generator
Compute MD5, SHA-1, and SHA-256 hashes from any text.
URL Encoder & Decoder
Encode or decode URLs and query strings instantly.
Regex Tester
Test and debug regular expressions with real-time matching.
Diff Checker
Compare two texts or code snippets side by side.
Code Beautifier
Beautify and format HTML, CSS, and JavaScript code instantly.
Cron Generator
Generate and parse cron expressions with a visual builder.
chmod Calculator
Calculate Linux file permissions visually with numeric and symbolic notation.
CSV to JSON
Convert CSV data to JSON format instantly in your browser.
JSON to CSV
Convert JSON data to CSV format instantly in your browser.
YAML to JSON
Convert YAML to JSON format instantly in your browser.
JSON to YAML
Convert JSON to YAML format instantly in your browser.
XML to JSON
Convert XML to JSON format instantly in your browser.
JSON to XML
Convert JSON to XML format instantly in your browser.
Markdown to HTML
Convert Markdown to HTML with live preview.
JWT Decoder
Decode JWT tokens instantly. View header, payload, claims & expiration status. 100% client-side.
SEO Tools
Word Counter
Count words, characters, sentences & paragraphs instantly.
Character Counter
Count characters with and without spaces in real time.
Meta Tag Generator
Generate SEO-optimized html meta tags for your website.
Robots.txt Generator
Generate, validate & block AI bots with robots.txt.
Sitemap Generator
Build a valid XML sitemap for your website.
Lorem Ipsum Generator
Generate placeholder text for designs.
Slug Generator
Convert text to SEO-friendly URL slugs.
Open Graph Preview
Preview how links appear on social media.
Marketing Tools
UTM Builder
Build UTM-tagged campaign URLs for tracking.
QR Code Generator
Generate custom QR codes instantly.
Hashtag Generator
Generate trending hashtags for social media.
Email Signature Generator
Create professional email signatures.
Privacy Policy Generator
Generate privacy policies for your website/app.
Terms of Service Generator
Create terms of service agreements.
Favicon Generator
Create favicons from text, emoji, or images.
Productivity Tools
Pomodoro Timer
Focus timer for productivity.
Password Generator
Generate secure, random passwords.
Timezone Converter
Convert time across different zones.
Unix Timestamp Converter
Convert Unix epochs to human time.
Color Picker
Pick, convert, and generate colors.
Image to Base64
Convert images to Base64 strings.
Text Case Converter
Convert text case (upper, lower, title, snake).
Text Tools
Fancy Text Generator
Generate fancy text styles and cool fonts for social media.
Text to Speech
Convert text to speech free in your browser.
Number to Words
Convert numbers to words and check writing format.
Roman Numeral Converter
Convert numbers and dates to Roman numerals.
Text to Binary
Translate text to binary code and vice versa.
Invisible Character
Copy invisible characters and blank text.
Remove Line Breaks
Remove line breaks and extra whitespace from text.
Text Repeater
Repeat text up to 10,000 times instantly.
Image Tools
Image Compressor
Compress JPG, PNG & WebP images free in your browser. No upload needed.
Image Resizer
Resize images to exact dimensions or social media presets free in your browser.
Image Format Converter
Convert between PNG, JPG, WebP, BMP & GIF formats free in your browser.
HEIC to JPG Converter
Convert iPhone HEIC photos to JPG instantly in your browser. Free, no upload needed.
Background Remover
Remove image backgrounds instantly with AI — free and 100% browser-based.
Image Cropper
Crop images online free with 16:9, 4:3, 1:1 & custom aspect ratios. Browser-based.
Rotate & Flip Image
Rotate images 90°, 180°, 270° or flip horizontally/vertically online for free.
Add Watermark
Add text watermarks to images free online. Adjust opacity, tile pattern & position.
Bulk Image Rename
Rename multiple images at once with custom patterns, numbering & prefixes.
PDF Tools
Merge PDF
Merge PDF files online for free — 100% browser-based, no file upload.
Split PDF
Split PDF into separate pages or custom ranges — free, browser-based, no upload.
PDF to Image
Convert PDF pages to high-quality JPG or PNG images — free, private, no upload.
Image to PDF
Convert JPG, PNG & other images to PDF — free, browser-based, no upload.
Compress PDF
Compress PDF files online for free without losing quality. 100% browser-based.
PDF to Word
Convert PDF files to editable Word documents — free, browser-based, no upload.
Word to PDF
Convert DOCX files to PDF — free, browser-based, no upload required.
PDF Password Protect
Add password protection to your PDF files — free, browser-based, no upload.
Unlock PDF
Remove password restrictions from PDF files — free, browser-based, no upload.
Rotate PDF
Rotate PDF pages free in your browser. Fix sideways or upside-down pages instantly.
PDF Editor & Annotator
Edit & annotate PDFs free in your browser. Add text, highlights, shapes & more.
Calculators
Personal Loan Calculator
Calculate personal loan payments, interest, and credit score impacts.
Age Calculator
Calculate your exact age in years, months, days, hours and minutes.
Percentage Calculator
Calculate percentages — find X% of Y, percentage change, increase and decrease.
Random Number Generator
Generate cryptographically secure random numbers, roll dice, flip coins.
BMI Calculator
Calculate your BMI with metric or imperial units and see your category.
Tip Calculator
Calculate tips and split bills instantly. Choose tip percentage, divide among friends, see per-person totals with round up option.
Salary Calculator
Convert salary between hourly, weekly, biweekly, monthly & annual. Estimate take-home pay after taxes.
GPA Calculator
Calculate semester and cumulative GPA on a 4.0 scale.
Discount Calculator
Calculate sale prices, savings, and double discounts instantly.
Date Calculator
Calculate days between dates or add/subtract days from any date.
Compound Interest Calculator
See how your investment grows with compound interest and monthly contributions.
Loan Calculator
Calculate monthly loan payments with full amortization schedule. Export to CSV, PDF, or Excel.
Debt Payoff Calculator
Compare Snowball vs. Avalanche strategies to find the fastest, cheapest way to pay off your debts.
Mortgage Calculator
Calculate monthly mortgage payments with principal, interest, taxes, PMI, insurance & HOA. Free amortization schedule and loan comparison.
ROI Calculator
Calculate return on investment instantly. Compare investments, see annualized returns, analyze marketing ROI.
Profit Margin Calculator
Calculate profit margin, markup %, and net profit instantly. Convert margin to markup, find break-even revenue.
VAT Calculator
Add or remove VAT from any price. Pre-loaded rates for 40+ countries including UK, EU. Reverse VAT calculation.
Home Affordability Calculator
Calculate how much home you can afford based on income, debts, and the 28/36 rule. See monthly payment breakdown with taxes, insurance, and PMI.
Mortgage Refinance Calculator
Compare current vs. new mortgage, calculate break-even point, monthly savings, and lifetime cost impact of refinancing.
Auto Loan Calculator
Calculate your car payment with credit score-based rates, trade-in, down payment, and sales tax. New and used car support.
Retirement Savings Calculator
Project your retirement savings with compound growth, Social Security, inflation adjustment, and the 4% safe withdrawal rule.
Rent vs. Buy Calculator
Compare the true cost of renting vs. buying a home over time, including equity, taxes, PMI, maintenance, and investment opportunity cost.
Savings Goal Calculator
Find exactly how much to save daily, weekly, or monthly to reach any financial goal with compound interest and inflation adjustment.
Mortgage Payoff Calculator
See how much interest you save and years you cut by paying extra on your mortgage. Compare strategies: extra monthly, bi-weekly, or lump sum.