Free Online Developer Tools

Fast, minimal tools for everyday dev tasks — designed for privacy. Everything runs locally in your browser.

✓ Runs locally in your browser.

✓ No uploads. No tracking.

✓ 100% privacy-focused.

Tip: try “base64”, “json”, “timestamp”.

Base64 Encoder

Convert text to Base64

Base64 Decoder

Decode Base64 to text

File to Base64

Encode files to Base64

Base64 to File

Restore files from Base64

JSON Beautifier

Format and prettify JSON

JSON Validator

Validate JSON syntax

JSON to CSV

Convert JSON to CSV

CSV to JSON

Convert CSV to JSON

JWT Decoder

Decode JWT headers and payloads

JWT Expiration Checker

Check JWT expiry and remaining time

Unix to Date

Convert timestamp to date

Date to Unix

Convert date to timestamp

URL Encode / Decode

Encode or decode URLs

Text Diff Checker

Compare text changes

File Size Analyzer

Check file and payload size

No Servers. No AI. Just Fast, Simple Tools.

Select a tool above to get started.