Guides
Explainers for the questions behind the tools: which format to pick, why a file is too big, what a setting actually changes. Every guide is fact-checked and tested.
DevelopersWhat is Base64? Base64 encoding explained step by stepBase64 turns any bytes into plain text using 64 safe characters. Here's exactly how the conversion works, what it costs in size, and the variants and mix-ups that cause bugs.PDFAre online file converters safe? How to tell where your file goesSome converters upload a copy of your file to their server, others do the work inside your browser, and a few are traps. Here is how to tell them apart in two minutes, and what ToolzyLab does with your files.ImagesHow to compress images without losing qualityWe compressed the same photos at every quality setting and measured size and quality. The short version: resize first, pick the right format, then use quality 75-85.Text and writingHow long should a blog post be? What Google says and what worksGoogle has said plainly that it has no preferred word count. Length still matters, because a post has to cover the question. Here is how to size a post by search intent and check it before you publish.ImagesImage SEO checklist: what Google actually usesEvery item here traces back to Google Search Central's image guidance or Core Web Vitals advice, with the markup to copy. Work through it before you publish a page with images.ImagesJPG vs PNG vs WebP: which image format should you use?We saved the same photo and the same screenshot in every format and measured the files. Here is what each format is good at, where it breaks, and which one to pick for each job.DevelopersJSON vs YAML vs CSV: which data format should you use?The same product list written three ways, the parsing surprises we reproduced in real YAML libraries, and a plain rule for choosing between them.DevelopersMD5 vs SHA256 vs SHA-1: which hash should you use?MD5 and SHA-1 have both been broken by real collision attacks. SHA-256 hasn't. Here's what that means in practice, which one to use for what, and how to check a download's checksum on any computer.EverydayQR code ideas for small business: what to encode and how to print itNine QR code ideas that save customers real effort, with the exact text each code should contain, how big to print it, and how to stop a fake sticker from hijacking it.DevelopersRegex cheat sheet: JavaScript syntax, flags and tested examplesEvery token you need for everyday regular expressions in JavaScript, in tables you can scan, plus 15 practical patterns we ran in Node.js 22 before publishing and the cases where each one breaks.EverydayHow to schedule a meeting across time zones without the 3 a.m. inviteA worked example for New York, London, Bengaluru and Sydney, the 2026 and 2027 daylight saving dates that shift your meetings, and a way of writing times in invites that nobody can misread.