PDF Compression vs Image Quality: What Should You Choose?
Understand the trade-off between PDF file size and image quality. Choose practical compression settings for email, forms, websites and archiving.
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How to Combine PDFs Without Uploading Files
Combine PDF files privately in your browser without uploading documents to a server. Learn how local PDF merging works and what to check first.
QR Code Size, Contrast and Print Quality Guide
Choose the right QR code size, colors, contrast and quiet-zone margin for print. Improve scanning reliability on posters, cards and packaging.
How to Split a Restaurant Bill With Tax and Tip
Split a restaurant bill with tax and tip using a clear formula. Calculate gratuity, the final total and each person’s equal share.
Restaurant Tipping Guide: Before or After Tax?
Should you calculate a restaurant tip before or after tax? Compare both methods, understand service charges and calculate the final bill accurately.
How to Calculate Percentage Change Correctly
Learn the percentage change formula, avoid common mistakes with negative and zero values, and calculate increases or decreases with clear examples.
How to Resize an Image for WhatsApp
WhatsApp is convenient for sharing photos, but it does not always show them the way you expect. A profile photo can be cropped awkwardly, a status image can lose its edges, and a photo sent in a chat can arrive softer than the original. Preparing the image first gives you more control. This guide shows … Read more
How to Resize an Image for Instagram
An image that looks perfect on your phone can look cropped, blurry, or stretched once it reaches Instagram. The fix is usually simple: prepare the size before you upload, rather than letting the app guess. This guide shows how to resize an image for Instagram with the free Image Resizer, which sizes to use as … Read more
How to Reduce PDF Size Online
A large PDF can be awkward to email, slow to upload, and easy to reject when a form sets a file-size limit. Many oversized PDFs shrink well, especially when most of the bulk comes from photos or scanned pages. This guide shows how to reduce PDF size online with the free Compress PDF tool, what … Read more
UUIDs and Random Data: When to Use Each
TOOLS2030 / Developer Tools UUIDs and Random Data: When to Use Each UUIDs and random numbers both create values that are difficult to predict, but they are used for different purposes. A random number belongs to a chosen numeric range, while a UUID is designed to provide a very large identifier space for records and … Read more