A collection of simple online developer utilities for formatting, decoding, generating, and calculating data. Browse the tools below and open any one to start using it.
Format and validate JSON input quickly for APIs and web development.
Decode JWT headers and payloads to inspect authentication tokens.
Encode text to Base64 or decode Base64 content back to plain text.
Create version 4 UUIDs for databases, APIs, and system identifiers.
Generate MD5 and SHA-256 hashes for text and strings.
Format and minify JSON responses from APIs for easy debugging.
Test regular expressions against sample text and inspect matches.
Build cron schedules for automation and server tasks.
Create simple invoice previews for services and freelance work.
Calculate tax amounts and totals with a chosen tax rate.
Calculate profit and margin percentage from cost and selling price.
Estimate salary, deductions, and take-home pay for payroll planning.
Convert between major currencies for travel, budgeting, and estimates.
Estimate monthly installments, total interest, and total repayment for a loan.
Convert Nepali Bikram Sambat dates to Gregorian dates and vice versa.
Convert between Nepali land units such as Ropani, Aana, Dhur, and Bigha.
Combine multiple PDF files into one document with a single click.
Split a PDF into two parts at a page you choose.
Reduce PDF file size for easier sharing and storage.
Convert a PDF into a basic Word document with extracted text.
Convert a Word document into a straightforward PDF file.
Extract text from scanned PDFs or images using OCR.
Turn one or more images into a polished single-page PDF collection.
Reduce file size for JPG and PNG files while keeping image quality balanced.
Remove a solid-color background from uploaded images and make it transparent.
Resize images quickly to your preferred width and height.
Convert JPG or PNG files into the modern WebP image format.
Convert PNG files to JPG with a white background for broader compatibility.
Create multiple favicon sizes from a single uploaded image.
Generate creative business name ideas for startups and brands.
Create QR codes for URLs, text, and simple messages.
Create SEO-friendly title, description, and keyword tags.
Generate social share previews and OG meta tags.
Create robots.txt rules to guide crawler access.
Create XML sitemaps from a list of URLs.
Check how often a keyword appears in your content.
Generate clean, SEO-friendly URL slugs from any title.
Create campaign URLs with UTM parameters for tracking.
Create a professional email signature with your contact details.
Create relevant hashtags for social media posts and campaigns.
Create polished bios for profiles, portfolios, and introductions.
Create catchy title ideas for videos, tutorials, and channel content.
Create short, catchy text ideas for thumbnails, banners, and headlines.
Generate highly secure, customizable random passwords client-side.
Generate secure random API keys with customizable prefixes and lengths.
Create cryptographically secure CSRF tokens for web form security.
Generate unique, cryptographically strong tokens for sessions and keys.
Generate single or batch RFC 4122 version 4 UUIDs with custom formats.
Generate secure RSA public and private key pairs in PEM format.
Encrypt sensitive text data securely using strong AES GCM/CBC algorithms.
Decrypt AES GCM/CBC encrypted text with a password and IV.
Decode and validate JSON Web Tokens (JWT) for signature and claims.
Identify unknown cryptographic hashes by matching their byte patterns.
Parse any URL string to extract host, paths, queries, and hash components.
Quickly and safely shorten any URL using public API integration.
Add UTM tracking parameters to campaign URLs for analytics.
Generate clean robots.txt rules to guide search engine crawlers.
Create valid XML sitemaps to optimize website indexation.
Generate HTML search engine meta tags for web pages.
Create social sharing Open Graph meta tags for Facebook and LinkedIn.
Generate social media card meta tags to optimize layouts on X.
Retrieve and check canonical link tags defined on any webpage.
Analyze and trace HTTP redirect hops (301/302) for any URL.
Resolve DNS records (A, MX, CNAME, TXT) for any host or domain.
Fetch domain registration logs and ownership data via WHOIS protocol.
Validate domain SSL certificate details, authority, and health status.
Resolve geographic location, coordinates, and ISP details of an IP.
Parse and analyze user agent strings to extract OS and browser details.
Fetch and inspect HTTP response headers and security headers of a URL.
Check host latency and packet response times via TCP handshakes.
Convert values between standard metric and imperial length units.
Convert weights and masses between metric and imperial systems.
Convert between Celsius, Fahrenheit, and Kelvin scales instantly.
Convert area sizes between square meters, acres, and hectares.
Convert capacities and volumes between liters, cups, and gallons.
Convert velocities between mph, km/h, knots, and m/s.
Convert pressure units including pascals, bar, psi, and atm.
Convert energy values between joules, calories, and kilowatt-hours.
Convert fuel efficiency values between MPG, L/100km, and km/L.
Convert angular measurements between degrees, radians, and grads.
Convert data sizes between bits, bytes, MB, GB, and TB (base 1000/1024).
Determine exact age in years, months, and days from date of birth.
Calculate total days and exact calendar duration between two dates.
Calculate business days, excluding custom weekends and holidays.
Convert calendar date-time values between global timezones.
Set up visual countdown widgets for events and project deadlines.
Track splits, lap times, and precise millisecond intervals.
Generate, customize, and print calendar sheets for any month/year.
Calculate ISO week numbers and starting/ending week dates.
Check if a year is a leap year using standard divisibility checks.