Free Online Developer Tools Free Online Developer Tools

Fast, API-backed utilities for converting, formatting, validating, and generating data.

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Tools

Calculators (8)

Bandwidth Transfer Time Calculator

Calculate file transfer time based on bandwidth and file size.

Bandwidth Transfer Time Calculator

Estimate transfer time by size and bandwidth.

Password Entropy Calculator

Calculate password entropy, strength, and estimated crack time.

RAID0 Capacity Calculator

Calculate RAID0 capacity.

RAID1 Capacity Calculator

Calculate RAID1 capacity.

RAID10 Capacity Calculator

Calculate RAID10 capacity.

RAID5 Capacity Calculator

Calculate RAID5 capacity.

Subnet Calculator

Calculate subnet details: network address, broadcast, host range, and more.

Encoders (4)

Base64 Decoder

Decode Base64 to text.

Base64 Encoder

Encode text to Base64.

URL Decoder

Decode URL to text.

URL Encoder / Decoder

URL encode or decode strings online.

Formatters (4)

CSV Formatter

Normalize CSV formatting.

JSON Formatter / Pretty Print

Format and pretty-print JSON data with proper indentation.

SQL Formatter

Format and beautify SQL queries with proper indentation.

XML Formatter / Pretty Print

Format and indent XML data for better readability.

Converters (8)

CSV to JSON Converter

Convert CSV data to JSON array format.

Date to Unix Time Converter

Convert ISO date to Unix timestamp.

JSON to CSV Converter

Convert JSON arrays and objects to CSV format instantly.

JSON to XML Converter

Convert JSON to XML.

JSON to YAML Converter

Convert JSON to YAML format online.

Unix Time to Date Converter

Convert Unix timestamp to ISO date.

XML to JSON Converter

Convert XML data to JSON format online.

YAML to JSON Converter

Convert YAML to JSON.

Validators (9)

Email Validator

Validate email addresses for correct format.

IP Address Validator

Validate IPv4 and IPv6 addresses and show network information.

JSON Validator

Validate JSON syntax and find errors in your JSON data.

JWT Validator

Validate JWT structure.

Regex Tester

Test regular expressions against sample text and see matches.

Domain Validator

Validate domain values.

Email Validator

Validate email values.

Ipv4 Validator

Validate ipv4 values.

Url Validator

Validate url values.

Generators (6)

JWT Generator

Generate a JWT with HS256.

Password Generator

Generate cryptographically secure random passwords.

robots.txt Generator

Generate robots.txt files for your website.

SHA256 Hash Generator

Generate SHA256 hash.

URL Slug Generator

Generate clean URL slugs from text strings.

UUID Generator

Generate UUID v1 and v4 identifiers.

Parsers (1)

JWT Token Parser

Decode and inspect JWT tokens — view header, payload, and signature.

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