Small lessons, real files
These are guided problem-solving workflows, not generic definitions. Each lesson identifies the inputs, the steps to try, what success should look like, and when you need another tool. Start with our downloadable samples if you do not want to use a private file.
Pick an image format for a website
Follow a reproducible export experiment for a product image, logo and screenshot.
Read tutorial ↗Worked tutorialShare a photo with fewer privacy surprises
Use a layered privacy checklist: pixels, EXIF and exported copy verification.
Read tutorial ↗Worked tutorialDebug a CSV that will not import
Reproduce mismatched columns and quoted commas using our test files.
Read tutorial ↗Worked tutorialPrepare a multi-page PDF for email
Merge, check reading order, compare sizes and avoid accidental information disclosure.
Read tutorial ↗Worked tutorialVerify a file download using SHA-256
Compare hashes carefully and understand what a checksum cannot prove.
Read tutorial ↗Already know the basics?
Browse our existing eight technical format and privacy guides. Those explain image compression, scanned PDF text, secure redaction considerations, subtitles, checksums, and browser-based processing in more depth.
Want the deeper technical explanation?
Explore our five technical handbooks covering image compression, PDF internals, photo privacy, video codecs and audio engineering. They pair concepts with practical checks, worked arithmetic and source specifications.