Guides
Practical write-ups on topics you run into while using the tools, from tidying PDFs and converting photos to watermarks, tempo and rhythm, with real steps and examples.
- Why PDFs get so big, and how to shrink them
Two 10-page PDFs can be 200 KB and 30 MB. Once you know why, choosing how to shrink one is easy. This guide covers finding the cause, picking the right method, and checking the result before you submit it.
Related tools: Compress PDF, Merge & Arrange PDF, Images to PDF
- Combining documents into one PDF: practical tips
When you need to bundle assignments, portfolios or supporting documents in different formats into a single PDF, here's the workflow: deciding the order, converting formats, page numbers and file names, and the final check before you submit.
Related tools: Merge & Arrange PDF, Images to PDF, Compress PDF
- Turning photos and scans into a PDF: shooting, resolution and order
When you turn phone photos of paperwork into a PDF, most of the quality is decided when you take the picture. Here's how to shoot documents well, how resolution relates to print size, and how to order pages and hide personal details.
Related tools: Images to PDF, Merge & Arrange PDF
- Where to put an image watermark, and how strong to make it
Watermark position, size and opacity depend on what you want the watermark to do. Here's how to choose settings for crediting, discouraging reuse or marking drafts, and what a watermark can and can't actually achieve.
Related tools: Batch Watermark
- What BPM means, and how it's used in music, workouts, practice and video
BPM is just the number of beats per minute, yet the same song can read as 70 or 140. Here's how to calculate it, where the confusion comes from, how different fields use it, and how to measure it yourself.
Related tools: BPM Tapper, BPM Detector, Tempo Ear Test
- Building a sense of rhythm: practicing hearing and holding a tempo
A sense of rhythm becomes much easier to practice once you split it into hearing how fast something is and keeping a tempo steady. Here's how to measure where you are, a 10-minute daily routine, and how to keep a log.
Related tools: Tempo Ear Test, BPM Tapper, BPM Detector
- Processing files in the browser vs uploading to a server: what actually differs
Online tools either upload your file to a server or process it inside your browser. This guide explains, without exaggeration, how the two really differ, the pros and cons of each, and how to check for yourself.
Related tools: Images to PDF, Merge & Arrange PDF, Batch Watermark, Compress PDF
- What does facial-expression AI actually look at? How it works, its limits, and using it responsibly
What is an AI really calculating when it reports "happy 70%" for a face in a photo or on camera? This guide walks through finding faces, classifying expressions and how fun-test scores are built, and how far the results can be trusted.
Related tools: Live Emotion Detector, Photo Emotion Analyzer, AI First Impression, Animal Face Test