Free tools · Developer resources · AI helpers

Free tools for the digital world.

Powerful online tools for developers, creators, businesses and everyday digital work.

Compress an image...Format JSON...Calculate GST...Create a QR code...

Explore Tools Ask AI

Popular tools

Open instantly — no account required.

View all

JSON Formatter

Format, validate, minify and beautify JSON instantly in your browser.

Developer

JSON Validator

Check whether a JSON string is valid and see clear error messages.

Developer

Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 back to text.

Developer

URL Encoder / Decoder

Encode or decode URL query strings and path segments safely.

Developer

UUID Generator

Generate UUID v4 identifiers for apps, databases, and APIs.

Developer

JWT Decoder

Decode JWT header and payload locally. Does not verify signatures.

Developer

Editor picks

JSON Formatter

Format, validate, minify and beautify JSON instantly in your browser.

Developer

JSON Validator

Check whether a JSON string is valid and see clear error messages.

Developer

Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 back to text.

Developer

UUID Generator

Generate UUID v4 identifiers for apps, databases, and APIs.

Developer

Markdown Preview

Write Markdown and preview rendered HTML side by side.

Developer

Meta Tag Generator

Generate title, description, and social meta tags for your pages.

SEO

Robots.txt Generator

Build a robots.txt file with allow/disallow rules and sitemap URL.

SEO

Word Counter

Count words, characters, sentences, and reading time.

Text

Percentage Calculator

Calculate percentages, increases, decreases, and “X is what % of Y”.

Calculators

Developer tools

See category

JSON Formatter

Format, validate, minify and beautify JSON instantly in your browser.

Developer

JSON Validator

Check whether a JSON string is valid and see clear error messages.

Developer

Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 back to text.

Developer

SEO tools

See category

Meta Tag Generator

Generate title, description, and social meta tags for your pages.

SEO

Robots.txt Generator

Build a robots.txt file with allow/disallow rules and sitemap URL.

SEO

Sitemap Generator

Generate a basic XML sitemap from a list of URLs.

SEO

AI tools

See category

AI Prompt Generator

Build clearer prompts for writing, coding, and research tasks.

Prompt Formatter

Clean and structure a messy prompt into clear sections.

AI Text Helper

Prepare rewrite, shorten, or expand instructions for an AI assistant.

Image tools

See category

Image Compressor

Compress images in your browser by re-encoding with quality control.

Image

Image Resizer

Resize images to exact dimensions or by percentage.

Image

Image Converter

Convert images between PNG, JPEG, and WebP in the browser.

Image

Text tools

See category

Word Counter

Count words, characters, sentences, and reading time.

Text

Case Converter

Convert text to upper, lower, title, or sentence case.

Text

Text Cleaner

Remove extra spaces, blank lines, and tidy pasted text.

Text

Business tools

See category

Invoice Calculator

Add line items, tax, and discounts to estimate an invoice total.

Business

Profit Margin Calculator

Calculate profit, margin %, and markup from cost and selling price.

Business

QR Code Generator

Create a QR code for a URL or text and download it as PNG.

Business

Calculators tools

See category

Percentage Calculator

Calculate percentages, increases, decreases, and “X is what % of Y”.

Calculators

GST Calculator

Calculate GST-inclusive and exclusive amounts for India rates.

Calculators

EMI Calculator

Estimate loan EMI from principal, interest rate, and tenure.

Calculators

Not sure which tool?

Describe what you want to accomplish — we recommend a real tool from this catalog.

Tool finder