AI Toolbox
34 free tools, all running in your browser

Free Online Developer Tools
34 Browser-Based Tools

A curated collection of fast, privacy-first tools for AI developers, technical writers, and anyone who works with documents.

No data leaves your device
Instant processing
No signup required
AI Tools3 tools

Token Calculator

Count tokens for GPT-4, Claude, and other LLMs.

AI Model Comparison

Compare GPT-4, Claude, and Gemini side by side.

Text Chunker

Split long text into semantic chunks for RAG.

Document Convert5 tools

Word to Markdown

Convert DOCX and DOC files to Markdown.

Excel to Markdown

Convert XLSX spreadsheets to Markdown tables.

PDF to Markdown

Extract text from PDF files as Markdown.

URL to Markdown

Convert web pages to clean Markdown.

HTML to Markdown

Convert HTML code to Markdown format.

PDF Tools10 tools

PDF to Image

Convert PDF pages to PNG, JPEG, or WEBP.

Image to PDF

Combine JPG, PNG, and GIF images into PDF.

PDF Merge

Combine multiple PDF files into one document.

PDF Split

Extract specific pages or ranges from PDF.

PDF Watermark

Add custom text watermarks to PDF files.

PDF Compress

Reduce PDF file size while preserving quality.

PDF Rotate

Rotate PDF pages by 90, 180, or 270 degrees.

PDF Crop

Remove unwanted margins from PDF documents.

PDF Encrypt

Protect PDF files with a password.

PDF Decrypt

Remove password protection from PDF files.

Data Convert6 tools

JSON Formatter

Format, validate, and view JSON data.

YAML ↔ JSON

Convert between YAML and JSON formats.

XML Converter

Convert XML to JSON and vice versa.

CSV ↔ JSON

Convert CSV files to JSON and back.

CSV to SQL

Generate SQL statements from CSV data.

JSON Repair

Fix broken and malformed JSON instantly.

Developer Tools6 tools

Hash Generator

Calculate MD5, SHA-1, SHA-256, and SHA-512 hashes.

Base64 Encoder

Encode and decode Base64 strings and files.

URL Encoder

Encode and decode URL parameters and query strings.

JWT Decoder

Decode JSON Web Tokens to view claims.

Regex Tester

Test and debug regular expressions in real-time.

Code Formatter

Format code with Prettier in multiple languages.

Text Tools4 tools

Markdown Editor

Write and preview Markdown in real-time.

Text Stats

Count words, characters, and analyze text.

Text Case Convert

Convert text between various case formats.

Batch Replace

Perform multiple find-and-replace operations at once.