Tool Directory

Explore all tools

Find the utility you need and open it instantly.

Text Tools

Remove Duplicate Lines

Strip repeated lines from multiline text while keeping first-seen order.

Open Remove Duplicate Lines

Developer Tools

JSON Formatter / Beautifier

Format and beautify JSON instantly with proper indentation.

Open JSON Formatter / Beautifier

Developer Tools

CSV to JSON Converter

Convert CSV data into structured JSON quickly.

Open CSV to JSON Converter

Developer Tools

JSON to CSV Converter

Convert JSON arrays of objects (or a single object) into CSV.

Open JSON to CSV Converter

Developer Tools

JSON to TypeScript Interface Generator

Generate TypeScript interfaces from JSON samples.

Open JSON to TypeScript Interface Generator

Text Tools

Text Diff Checker (Compare Text)

Compare two text blocks and highlight differences.

Open Text Diff Checker (Compare Text)

Text Tools

Remove Extra Spaces / Clean Text

Clean up extra spaces and normalize plain text.

Open Remove Extra Spaces / Clean Text

Developer Tools

Base64 Encoder

Encode plain text to Base64 instantly.

Open Base64 Encoder

Developer Tools

Base64 Decoder

Decode Base64 back to plain text.

Open Base64 Decoder

Developer Tools

URL Encoder

Encode text into URL-safe format instantly.

Open URL Encoder

Developer Tools

URL Decoder

Decode URL encoded strings back to plain text.

Open URL Decoder

Security Tools

Strong Password Generator

Generate strong random passwords with customizable character rules.

Open Strong Password Generator

Calculators

Percentage Calculator

Calculate percentages, increases, and decreases quickly.

Open Percentage Calculator

Frequently asked questions

Quick answers about using OnlineToolkit.

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Fast, privacy-first tools for text, images, dev work and productivity. No clutter, just practical utilities that run in your browser.

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