Tokenizer

Paste text and see approximate token count using a BPE-like JS estimator for LLM cost planning.

Prompt Diff Viewer

Compare two prompts side by side with highlighted changes to spot edits quickly.

System Prompt Builder

Drag-and-drop blocks to assemble structured system prompts for any LLM.

Temperature Visualizer

See how temperature affects probability distributions with interactive sliders and charts.

Context Window Calculator

Input your model and content to see how much context window space is used and remains.

Bias Word Highlighter

Flag loaded, vague, or biased words in prompts to improve LLM output quality.

Few-Shot Formatter

Paste examples and auto-format them into clean few-shot XML or JSON templates.

LLM Output Tester

Test regex extraction patterns against sample LLM outputs with live matching and groups.

Words to AI Models Token Calculator

Estimate LLM cost from word counts before writing. Quick pricing for input + output across top AI models.

PDF Converter

Convert text, images, or Word documents into a PDF.

File Size Converter

Convert between KB, MB, GB, and TB.

Unit Converter

Convert between different units of measurement like length, weight, etc.

Markdown to PDF Converter

Convert Markdown to PDF with live preview. Export articles, docs, and notes with proper formatting, tables, and code blocks.

Invoice Generator

Create professional invoices in your browser and download as PDF.

Sticky Notes

Create, move, and organize colorful sticky notes. Auto-saves to your board.

To Do List

Simple, checkbox-style task list for your daily needs.

Task Manager

Kanban board to manage projects with priorities and drag-and-drop.

Online Notepad

Write and save notes instantly in your browser without login. Auto-save enabled.

Word Counter

Count words, characters, and paragraphs in real-time.

Case Converter

Convert text to uppercase, lowercase, title case, and more.

Text Compare

Find differences between two text files.

Lorem Ipsum Generator

Generate placeholder text for your designs.

RGB to HEX

Convert RGB color values to HEX codes with real-time preview.

HEX to RGB

Convert HEX color codes to RGB values instantly.

JSON Formatter

Beautify and validate your JSON data. Error detection included.

Markdown Previewer

Preview Markdown syntax in real-time.

HTML/CSS/JS Compressor

Compress and decompress code securely. Supports HTML, CSS, and JS.

Regex Tester

Test regular expressions with real-time matching and pattern library.

Color Contrast Checker

Check WCAG contrast ratios for accessibility compliance.

CSV to JSON Converter

Convert CSV files to JSON and vice versa with custom delimiters.

Gradient Generator

Create beautiful CSS gradients with visual editor and presets.

JWT Decoder

Decode and inspect JSON Web Tokens. View header and payload data.

URL Encoder/Decoder

Encode and decode URLs and URL components.

Base64 Text Encoder

Encode and decode text to/from Base64 format.

UUID Generator

Generate random UUIDs in various formats.

Flow Chart

Create animated flowcharts with export to PNG and GIF. Drag, drop, and connect shapes.

Image Resizer

Resize images to custom dimensions quickly.

Base64 Image Converter

Convert images to Base64 strings and decode Base64 back to images.

QR Code Generator

Create QR codes for URLs, text, and more. Download instantly.

BMI Calculator

Calculate Body Mass Index for health tracking.

Pomodoro Timer

Boost productivity with focused work intervals.

Countdown Timer

Track time for events and tasks.

Age Calculator

Calculate your exact age in years, months, days.

Time Zone Difference

Calculate time gap between two zones.

Percentage Calculator

Calculate percentages, percentage increase/decrease easily.

Password Generator

Generate strong, secure passwords with custom length and options.

Hash Generator

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or files.