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GUIDES

Learn the why behind the tools.

Short, practical explanations of file formats, compression and the small technical decisions behind everyday tasks. Each guide links to the tools that do the job, and is written by the handytechhelper team and checked against how those tools really work.

Images

JPEG, PNG, WebP or AVIF: which image format should you use?What each common image format is good at, and a quick way to choose between them.6 min read · Updated How image compression affects quality (with a live demo)What the quality slider actually changes, with a demo that runs in your browser.7 min read · Updated How to resize an image without stretching or squashing itAspect ratios explained, with the one formula you need and when to crop instead.6 min read · Updated How to prepare images for a websiteA repeatable workflow for fast, sharp website images.7 min read · Updated

PDFs

Why PDFs get so big, and practical ways to make one smallerWhat really takes up space in a PDF, and honest ways to reduce it.6 min read · Updated

Files

Browser-based vs server-based file tools: what is the difference?What “processed in your browser” means, its limits, and how to check it yourself.6 min read · Updated How to fit photos and PDFs under an email attachment limitWhy attachments grow in transit, and how to send them anyway.5 min read · Updated

Developer

Base64, URL encoding and HTML entities: which one do you need?Three encodings that look alike but solve different problems.6 min read · Updated