Explore all categories and discover useful tools.
NinjaFunction is a collection of free online tools for developers, designers, students and anyone who needs a quick result without installing software. Every tool is grouped into a category, so you can find what you need whether you are protecting an account, formatting data, preparing an image or designing a label.
Choose a category to see its tools together with guides and answers to common questions. Here is what you will find in each one:
Password, encryption and security tools.
Includes: Password Generator, Password Strength Analyzer, IP Address & Geolocation Lookup, Image Metadata Viewer, Hash Generator, UUID Generator, File Encryptor, JWT Encoder / Decoder
JSON, Base64 and mock data utilities.
Includes: JSON Formatter, Base64 Encoder/Decoder, Mock Data Generator, Code Formatter & Beautifier, GitHub Downloader, Unix Timestamp Converter, Regex Tester, JSON to CSV Converter
QR code and media generation tools.
Includes: QR Code Generator, Text to Speech, Audio Trimmer, Video Trimmer, Barcode Generator & Reader
Color and design helper tools.
Includes: Color Picker & Generator, Color Contrast Checker, CSS Box Shadow Generator, Color Palette Generator, Color Palette from Image, Favicon Generator, CSS Gradient Generator, Color Shades Generator
HTML, DigiPin and sitemap tools.
Includes: HTML Viewer, My Digipin, Meta Tag Generator, What Is My Screen Resolution, robots.txt Generator, Open Graph Preview Checker, Sitemap.xml Generator
Image compression and optimization tools.
Includes: Image Compressor, GIF Creator, Watermark Tool, Image Resizer, Image Cropper, Image Converter, Meme Generator, HEIC to JPG Converter
Merge, split and convert PDF files.
Includes: Merge PDF, Split PDF, PDF to Images, Text to PDF, Image to PDF, PDF Watermark, PDF Page Numbers, PDF Compressor
ZPL label design and printing.
Includes: ZPL Editor, Invoice Generator, Receipt Generator, Certificate Maker, Barcode Label Sheet, Printable Calendar, Name Badge & ID Card Maker, Shipping Label Maker
Yes. Every tool on NinjaFunction is free, and you do not need to create an account or sign in.
Tools are grouped by what they help you do, such as protecting data, editing text, working with developer data, creating media, choosing colours, building websites, preparing images, working with PDF files and designing labels. If you are not sure where to look, use the search box at the top of this page.
Most tools work directly in your browser, so your text and files stay on your device. A few tools, such as lookups, contact an outside service to work, and each tool page explains how it handles your data.
Send us your idea from the Contact Us page. We read every suggestion when planning new tools.
Looking for something specific? See the full list of tools, read our guides and tutorials, or contact us with an idea.
