Tools

Understand the trade-off between PDF file size and image quality. Choose practical compression settings for email, forms, websites and archiving.

Combine PDF files privately in your browser without uploading documents to a server. Learn how local PDF merging works and what to check first.

Choose the right QR code size, colors, contrast and quiet-zone margin for print. Improve scanning reliability on posters, cards and packaging.

Split a restaurant bill with tax and tip using a clear formula. Calculate gratuity, the final total and each person’s equal share.

Should you calculate a restaurant tip before or after tax? Compare both methods, understand service charges and calculate the final bill accurately.

Learn the percentage change formula, avoid common mistakes with negative and zero values, and calculate increases or decreases with clear examples.