Welcome to fourwww
Online Tools for Private & Business
Free browser-based tools for everyday life and business: create QR codes and barcodes, combine PDFs, edit images and more. Get started directly, with no registration required.
Choose Private or Business for ideas, browse All Tools, or open a task below.
- No account requiredUse the tools without signing up.
- Ready to useOpen a tool and get started.
- Local processingMany inputs and files stay in your browser.
- Free to useNo hidden costs.
Tools for your everyday life and work
Featured Tools
Not sure where to start? Choose what you want to do. Each link opens the tool directly; no account is needed.
Create a QR code
Build a QR code for your content.
Merge PDF documents
Combine multiple PDF files in your chosen order.
Resize an image
Resize JPG, PNG, and WebP images to precise dimensions.
Generate a barcode
Choose a barcode format and enter your data.
Percentage Calculator
Calculate a percentage of a value, work out percentage changes, and increase or decrease values by a percentage.
Image Editor
Draw, crop, resize and annotate PNG, JPEG and WebP images.
JSON Formatter
Format, validate, inspect, and convert JSON.
Text Compare
Compare two texts line by line and clearly identify added, removed, and unchanged content.
QR codes or barcodes: which should you use?
Think first about who will read the code and what should happen next. QR Codes are a useful choice when someone should open a web page or receive information with a phone. They can connect a physical notice, label or handout to a digital next step without asking the reader to type it.
Barcodes suit workflows in which a scanner passes an identifier to an existing system, such as a product or internal reference. Their value usually comes from that system recognizing the number or text. Choose according to the receiving device and application, rather than treating every scannable symbol as interchangeable.
From creating a code to using it
Before creating anything, decide what the recipient needs and where the code will appear. Prepare the destination or source information, choose the appropriate tool, and review the entered content before downloading the result. Use a QR layout or template when it fits the intended communication.
Then check the code in the situation where it will be used. For print, try a sample at the intended size and with the expected scanning device. Leave the symbol clear of surrounding artwork and consider lighting, distance and surface. A successful scan is one check; the resulting information or destination must also serve the intended purpose.