Free Online Tools

Tiny tools.
Big productivity.

A clean collection of free browser tools for developers, writers, and creators. No accounts. No ads. No data collected.

100% FreeNo Sign UpClient-Side OnlyNo Data Stored

Text & Writing

4 tools

Word Counter

Count words, characters, sentences, paragraphs, and reading time instantly.

Character Counter

Count characters with and without spaces. Check platform limits for Twitter, Instagram & more.

Reading Time Calculator

Calculate how long it takes to read any text. Perfect for bloggers and content creators.

Text to Speech

Convert text to natural speech using your browser's built-in voices.

Image & File

5 tools

Image to WebP

Convert JPG, PNG, and GIF images to WebP format for faster websites.

WebP to PNG

Convert WebP images to PNG format with full transparency support.

WebP to JPG

Convert WebP images to JPG format quickly and easily.

JPG to PNG

Convert JPG/JPEG images to PNG format with lossless quality.

Image Compressor

Compress images to reduce file size while maintaining quality.

Developer

2 tools

JSON Formatter

Format, beautify, minify, and validate JSON data instantly.

Base64 Encoder/Decoder

Encode text to Base64 or decode Base64 strings back to plain text.

SEO

2 tools

Keyword Density Checker

Analyze keyword density, frequency, and distribution in your content for better SEO.

Meta Tag Generator

Generate optimized meta tags for better search engine visibility.

Security

1 tool

Password Generator

Generate strong, random passwords with customizable length and character options.

About 3STF Tools

3STF Tools is built by developers, for developers and creators. Every tool runs entirely in your browser — no uploads to servers, no data stored, no tracking. Fast, private, and always free. We believe the best tools are the ones that respect your privacy and just work.