IP Lookup
Find geographical and network information for IPs.
- #ip
- #lookup
- #location
- #network
Online developer tools directory
Explore free online calculators, converters, formatters, generators, lookup tools, and data utilities organized by category.
Popular long-tail tool searches
Search engines often send visitors through specific phrases like online JSON formatter, CSV to JSON converter online, free password generator, subnet calculator online, and text formatter online. This directory groups those intents into crawlable sections with strong internal links.
Lookup
Tools for looking up information about various entities.
Encode & Decode
Tools for encoding, decoding, and cryptography.
Base64 Encoder/Decoder
Encode and decode Base64 text or files with ease.
- #base64
- #encode
- #decode
- #convert
Hex Encoder / Decoder
Convert text or files into hexadecimal and back.
- #hex
- #encode
- #decode
- #convert
HTML Encoder / Decoder
Encode and decode HTML entities safely.
- #html
- #encode
- #decode
- #convert
URL Encoder/Decoder
Encode and decode URLs with support for multiple standards.
- #url
- #encode
- #decode
- #convert
Conversion
Tools for unit, format, and data conversion.
CSV to JSON Converter
Convert CSV files into structured JSON with customizable field options.
- #csv
- #json
- #convert
- #data
JSON to CSV Converter
Convert JSON data into CSV for spreadsheets and reports.
- #csv
- #json
- #convert
- #data
Timestamp Converter
Convert Unix timestamps into readable dates and back.
- #timestamp
- #convert
- #time
Calculator
Perform common calculations and conversions, such as unit, currency, and time.
Age Calculator
Work out exact age and next birthday details.
- #age
- #birthday
- #countdown
APR / APY Converter
Convert between annual percentage rate and yield.
- #apr
- #apy
- #finance
Basic Calculator
A simple calculator for everyday arithmetic operations.
- #calc
- #scientific
- #expression
BMI / BMR / TDEE
Calculate body mass index, basal metabolic rate, and daily energy use.
- #bmi
- #bmr
- #tdee
- #health
Combinatorics Calculator
Compute factorials, permutations, and combinations.
- #nCr
- #nPr
- #factorial
Compound Interest
Calculate interest growth with compounding options.
- #interest
- #fv
- #pv
- #annuity
Currency Converter
Convert currencies using live exchange rates.
- #fx
- #currency
- #rates
Date Difference
Find the difference between two dates or add/subtract days.
- #date
- #diff
- #business-days
Geometry Area & Volume
Calculate area and volume for shapes and solids.
- #area
- #volume
- #geometry
GPA Calculator
Compute GPA from course credits and grades.
- #gpa
- #grade
Hash Generator
Generate MD5, SHA and other hash values for text or files.
- #hash
- #md5
- #sha
- #security
Loan Amortization
Build repayment schedules for loans and mortgages.
- #loan
- #mortgage
- #amortization
Percentage Calculator
Work out percentages, discounts, and markups with ease.
- #percent
- #discount
- #markup
- #reverse
Quick Stats
Get quick statistics like mean, median, and variance.
- #mean
- #median
- #std
- #quantile
Recipe Scaler
Scale recipe ingredients by servings or portion size.
- #recipe
- #scale
- #kitchen
ROI & Break-even
Analyze return on investment and break-even points.
- #roi
- #break-even
- #payback
Subnet Calculator
Work out network, broadcast, and usable IP ranges.
- #cidr
- #subnet
- #network
Tip Splitter
Split bills and tips between people with rounding options.
- #tip
- #split
- #bill
Generators
Tools for generating various data and content.
Lorem Generator
Generate random Lorem Ipsum text for layouts.
- #lorem
- #generate
- #text
Password Generator
Generate secure, customizable passwords for any use.
- #password
- #generate
- #security
Random User Generator
Generate random user profiles online with names, photos, emails, addresses, and phone numbers. Fully customizable for testing, mock data, or sample projects.
- #random
- #user
- #generate
- #person
UUID Generator
Generate random UUIDs for use in projects and databases.
- #uuid
- #generate
- #id
Data Tools
Tools for data processing, conversion, and analysis.
CSV Cleaner
Clean CSV files by trimming, fixing quotes and removing empty rows.
- #csv
- #clean
- #trim
- #normalize
CSV Group By
Group CSV rows by columns and compute aggregates.
- #groupby
- #aggregate
- #sum
- #avg
- #count
CSV Lint
Validate CSV files for errors and formatting issues.
- #csv
- #validate
- #delimiter
- #encoding
CSV Row Filter
Filter CSV rows with custom conditions and export results.
- #filter
- #where
- #query
- #table
Dataset Profiler
Profile CSV datasets with column stats and quality checks.
- #profile
- #summary
- #stats
- #quality
Text Processing
Tools for text manipulation, formatting, and analysis.
Development
Utilities and helpers for developers.
AES Encryptor/Decryptor
Encrypt or decrypt text using the AES algorithm.
- #aes
- #encrypt
- #decrypt
- #security
HTML Formatter
Format HTML code for easier reading and editing.
- #html
- #format
- #dev
JSON Formatter
Format, validate and minify JSON with syntax highlighting and error checks.
- #json
- #format
- #code
Regex Tester
Test and debug regular expressions with real-time matches.
- #regex
- #test
- #dev
XML Formatter
Format XML files with indentation and line breaks.
- #xml
- #format
- #validate
- #dev