Guides
Short explanations of how PDF and image files work, so you can choose the right settings and keep your files private.
Are Online File Tools Safe? How to Check If Your Files UploadMost online PDF and image tools upload your file to a server. Learn how to tell, how to check in your browser in a minute, and what to look for in a policy.How PDF Compression Works (and Why Some PDFs Barely Shrink)Why PDFs get so big, what a compressor really changes, and how to shrink scans and photo-heavy files without making the text unreadable.How to Get a Photo or PDF Under an Upload Size LimitExam, job and government portals often cap uploads at 20 KB, 100 KB or 1 MB. The order to crop, resize and compress in, and how to hit the limit without blur.JPG, PNG, WebP or AVIF: Which Image Format Should You Use?A practical guide to choosing between JPG, PNG, WebP, AVIF and HEIC: when each one wins, what converting costs you, and where each one will not open.Pixels, DPI and Image Size: What the Numbers MeanPixel dimensions, DPI, megapixels and aspect ratio explained in plain language, with the maths for print and web sizes so you can size photos correctly.What Your Photos Reveal: EXIF Metadata and How to Remove ItPhotos can carry GPS location, timestamps and camera details. What EXIF data is, how to see it on your computer or phone, and how to remove it before sharing.Working With PDF Pages: Merge, Split, Reorder and NumberHow to combine PDFs, pull out the pages you need, fix page order and rotation, and add page numbers or a watermark, with the mistakes to avoid at each step.