Guides

The case for processing your files in the tab you already have open — not on someone else's server.

Mail servers have a 25 MB hard cap. Here's how to combine, shrink, and send a clean PDF entirely in your browser.

Resize, compress, strip EXIF, convert format — the full prep workflow for social, blog, and email images.

JSON, Base64, regex, hash, diff, JWT — the everyday utilities developers reach for, all in one place, all local.

Strip the metadata, watermark the result, lock the password — all in your browser, in under a minute.

Install as a PWA, add the browser extension, run the desktop build — three ways to make SnapToolz feel like installed software.

What's actually happening inside a PDF when you shrink it, why some files refuse to get smaller, and how to land on 100 KB, 1 MB, or any other ceiling without ruining the file.

Four formats, four different strengths, and a lot of wrong defaults out there. Here's which to use for photos, graphics, the web, email, and your phone — with real file-size numbers.

BMI was invented in the 1830s for population statistics, not for diagnosing individuals. Here's what it really tells you, and what it leaves out.

Where the EMI formula comes from, why the same rate can cost wildly different totals, and how a single extra payment per year shaves years off a mortgage.

Three base64url-encoded parts joined by dots. Most of the bugs aren't in the format — they're in how people verify it.

AES is the cipher. GCM is the mode that makes it safe to use. Here's the difference, and why getting the nonce wrong is the bug that ends careers.

Length beats complexity. Don't rotate without a reason. Use a manager. Adopt passkeys when you can. Most other advice is folklore.

Optical Character Recognition turns pixels into text. Modern OCR is astonishing on clean scans and quietly terrible on phone photos of receipts. Here's why, and how to get the best out of it.

The five-field format, the gotchas that bite everyone, and the cron flavours you'll meet in GitHub Actions, Kubernetes, and AWS.

A small DSL for matching shapes in text. Powerful, occasionally treacherous, and well worth the afternoon it takes to internalise.

How big should a hero image actually be? A thumbnail? An OG card? Here are the real numbers, the math behind retina and srcset, and the resampling choices that matter.

PDF is a layout format. DOCX is a flow format. They're fundamentally different things, and that explains every limitation of every PDF-to-Word converter ever made.

Why converted documents come out wrong — fonts shifted, tables broken, spacing gone — and how to get one that matches the original.

You've got a .docx and no Word licence. The free ways to edit it — and the one thing every free editor risks doing to your file.

Why copy-paste turns a neat table into one mangled column — and how to get PDF tables into a spreadsheet that actually adds up.

Every photo carries hidden data — including, often, the exact GPS location it was taken. Here's how to see it and strip it.

BMI was built to describe populations, not people. Here's what it actually measures, where it misleads, and what to look at instead.

Why a browser trim can't always cut exactly where you clicked — and how to cut without re-encoding your whole file.

Encrypting a file is easy. Getting the password to the other person without undoing the whole point is the part people get wrong.

Two encryption schemes, two different jobs. Why almost everything secure uses both — and which one is doing what when you send a file.