Practical guides, not fluff.
How-tos and explainers for the file formats, encodings, and dev tasks people search for every day — each one links to a free tool you can use immediately.
Unix Timestamp Explained: Converting Epoch Time to Human-Readable Dates
That mysterious 10 or 13-digit number in API responses and log files is a Unix timestamp. Here's what it means, why it starts in 1970, and the seconds-vs-milliseconds trap.
How to Generate a Strong Password (and Why Length Beats Complexity)
"Use a mix of symbols and numbers" is outdated advice. Here's what actually makes a password hard to crack, based on how modern password attacks work.
MD5 vs SHA-256: Choosing the Right Hash Function
Hash functions aren't interchangeable. Here's why MD5 is still around despite being broken, when SHA-256 is the right call, and what "broken" actually means for a hash.
Why Your JSON Won't Parse: Common Syntax Errors Explained
"Unexpected token" is the least helpful error message in software. Here are the actual syntax mistakes that break JSON, and how to spot them fast.
How to Remove the Background From a Photo for Free
Background removal used to require Photoshop skills or a paid subscription. Here's how automatic background removal works and how to get a clean cutout.
Base64 Encoding Explained: What It Is and When to Use It
Base64 shows up in data URIs, email attachments, and API tokens, but it's often confused with encryption. Here's what it actually does and when it's the right tool.
How to Merge PDF Files Without Installing Software
Combining PDFs used to mean Adobe Acrobat or a sketchy free download. Here's how browser-based merging works and what to watch for with page order and file security.
camelCase vs snake_case vs kebab-case: A Practical Naming Guide
Every language and platform seems to prefer a different naming convention. Here's what each one is actually used for, and how to convert between them without breaking things.
UUID v4 vs v1: What's the Difference and When to Use Each
UUIDs aren't all the same. A look at how v1 and v4 are actually generated, why v4 became the default, and when the other versions still matter.
What Is a JWT and How to Decode One Safely
JSON Web Tokens show up in almost every modern auth system. Here's what's actually inside one, how to read it, and why decoding is not the same as verifying.
PNG vs JPG vs WebP: Which Image Format Should You Use?
Choosing the wrong image format quietly wastes bandwidth or destroys quality. A practical breakdown of when to use PNG, JPG, and WebP — and how to convert between them.
How to Compress a PDF for Email Without Losing Quality
Most email providers cap attachments at 25MB. Here's how PDF compression actually works, what settings matter, and how to shrink a file without ruining your text or images.