Useful Online Tools & Calculators

Browse by category
API / JSON Tools
JSON Formatter
JSON Compare
JSON Minifier
JSON to Table
JWT Decoder
API Mock Generator
API Tester
API Documentation Generator
cURL Command Generator
Timestamp Converter
Formatter & Beautifier Tools
SQL Formatter
SQL Beautifier
CSS Minifier
CSS Beautifier
JS Minifier
JS Beautifier
HTML Minifier
HTML Beautifier
Android App Development (Java + Kotlin)
Java OkHttp Code Generator (Api Calling)
Java Volley Code Generator (Api Calling)
Java Retrofit Code Generator (Api Calling)
RecyclerView Adapter Generator
Android Model
Android Intent
SharedPreferences Generator
Android Room and SQLite Generator
Android Manifest Permission
ADB Command Generator
AAPT Command Generator
ProGuard/R8 Rules Generator
Android Color Resource Generator
Gradle Dependency Snippet Generator
Privacy Policy Generator
Play Store Screenshot Maker
Material 3 Color Palette
APK Signature Checker (SHA-1 / SHA-256)
APK Compare (2 APKs)
Keystore Viewer (JKS / PKCS12 SHA)
SQLite Viewer (open .db online)
Mobile App Development (Flutter)
Flutter UI Generator
Dart Model Class Generator
Number & Base Converters
Hex to Decimal
Decimal to Hex
Binary to Decimal
Decimal to Binary
Octal to Decimal
Decimal to Octal
Hex to Binary
Binary to Hex
CRC Calculator & Validator
Text & String Tools
String Compare / Diff
Text Length Counter
Case Converter
Lorem Ipsum Generator
Reverse Text
Remove Line Breaks
Remove Extra Spaces
Remove Duplicate Lines
Find & Replace
Duplicate Word Finder
Password Generator & Strength Checker
Regex Tester
UUID Generator
Hindi Typing (English to Hindi)
Kruti Dev to Unicode Converter
QR / Barcode Tools
QR Code Generator
Barcode Generator
WhatsApp Link Generator
Github Tools
Github Command Generator
Certificate & Key Tools
PEM to DER Converter (.pem to .der)
DER to PEM Converter (.der to .pem)
Operating System Tools
Windows Command Generator
Linux Command Generator
Image & Icon Tools
Image → Base64
Base64 → Image
App Icon Generator
Favicon Generator
Passport Size Photo Maker
Image Compressor
Image Format Converter
Text → Image Generator
YouTube Thumbnail Downloader
Photo Collage Maker
Meme Generator
Image Crop / Resize / Rotate
Color Palette from Image
Add Watermark to Image
Video Tools
Video Trimmer/Cutter
Video Compressor
Video to GIF Converter
Extract Audio from Video
Video Merger
Add Watermark to Video
Change Video Speed
Video Resolution/Format Converter
Remove Audio from Video
Change/Replace Video Audio
Recorders
Screen Recorder
Webcam Recorder
Voice Recorder
Screenshot Tool
Hardware & Device Tests
Keyboard Tester
Mouse Tester & CPS Test
Microphone Test
Speaker & Headphone Test
Webcam Test
Dead Pixel & Screen Test
Screen Resolution & Device Info
Network Tools
What Is My IP
DNS Lookup
WHOIS / Domain Lookup
SSL Certificate Checker
HTTP Header Viewer
Website Up / Down Checker
User Agent Parser
Internet Speed Test
Form Filling Helpers (Photo, Signature & PDF)
Photo & Signature Resizer (KB / cm)
Signature Background Remover
Compress PDF to Any Size
Document Scanner (Photo to PDF)
PDF Tools
Image → PDF
PDF → Image
PDF Password Remover
PDF Watermark Tool
PDF Password Set
Resume & Documents
Resume Maker
Cover Letter Maker
Marriage Biodata Maker
Invoice / GST Bill Generator
Quotation Generator
Salary Slip Generator
Rent Receipt Generator
Experience Letter Generator
Offer Letter Generator
Relieving Letter Generator
Visiting Card Maker
Certificate Maker
Meeting Schedule Sheet
Shop & Business Billing
Jewellery Bill Generator
Coaching Fee Receipt
WiFi / Internet Bill
Invitations & Print
Invitation Card Maker
Event Ticket Maker
Menu Card Maker
Price List Maker
Calendar Maker
Shipping Label Maker
Everyday & Real-Time Calculators
Age Calculator
EMI Calculator
Percentage Calculator
Date Difference Calculator
GST Calculator
Fuel & Mileage Tracker (PDF)
Shopping List Maker (PDF)
Health Tools
BMI Calculator
Health & Weight Record (PDF)
Baby Vaccination Schedule (India)
BP & Sugar Log (PDF)
Medicine Reminder Chart (PDF)
Finance & Investment
SIP Calculator
Compound Interest Calculator
FD & RD Calculator
Income Tax Calculator
Take Home Salary Calculator
Expense Tracker (PDF)
Group Expense Splitter (PDF)
UI / Design Tools
Neumorphism Generator
Gradient Text Generator
Gradient Generator
Box Shadow Generator
Color Shade Generator
Loading Spinner Generator
Screen Color Picker