95+ free tools
Free online tools for devs in one place
JSON, UUID, Base64, Regex, QR Code, text, dates, colors, QA workflows and automation
Tools for developer productivity
4DevTool centralizes free browser-based tools for developers in India: JSON, Base64, JWT, Regex, QR Code, UUID, text utilities, dates, colors, calculators, cron builder, cURL helpers and more.
The tools are built for development, testing, QA, demos and automation workflows without requiring sign-up or installation.
Pages are organized by country and category with direct, crawlable links to each tool.
🛠 Generators
5T Text
14🔢
Char Counter
Count chars/words
AaUppercase/Lowercase
Convert capitalization
🔗Slug / Case Converter
Between formats
↩Reverse Text
Reverse text
🔤Sort Alphabetically
Sort lines
🧹Remove Accents
Clean accents
📝Number to Words
Number in words
🔍Word Occurrence
Frequency in text
<>Text to HTML
Escape HTML entities
✂Trim Text
Truncate text
⋮Split String
Split by delimiter
ℹChar Info
ASCII, Unicode, hex
𝒜Custom Letters
Text styles
TRemove/Replace \n
Handle line breaks
% Calculators
7📅 Dates
3{} Code
19{ }
JSON Formatter
Format and validate
🔐JWT Decoder
Decode tokens
64Base64
Encode/decode
#Hash Generator
MD5, SHA-256...
URLURL Encoder
Encode URLs
{}CSV ↔ JSON
Convert formats
≠Text Diff
Compare texts
.*RegEx Tester
Test expressions
SQLSQL Formatter
Format queries
MDMarkdown Preview
Preview Markdown
{}JSON → TypeScript
Generate TS interfaces
🏷Meta Tag Preview
Preview meta tags
{}YAML ↔ JSON
Convert between formats
01Base Converter
Dec ↔ Hex ↔ Bin ↔ Oct
🔏JWT Generator
Create signed tokens
🌐IP / CIDR Calculator
Calculate IPv4 subnets
🔒SSL Cert Decoder
Decode X.509
≠JSON Diff
Compare two JSONs
📋JSON Schema
Generate and validate schemas