Guides

Plain-English explainers on file formats, conversion, and the tools built around them.

• SVG to DXF for Laser Cutting and CNCExport settings for turning SVG artwork into DXF files a laser or CNC router will actually cut — units, paths, text, curves, and what to check before you cut.
• Why Your DXF Imports at the Wrong SizeWhy DXF files import at the wrong size (unitless scale), how to diagnose $INSUNITS in a text editor, and how to fix it — 100% free.
• 10 Things You Can Do With a PDF (Without Installing Software)Merge, split, rotate, watermark, and extract text from a PDF — all directly in your browser, no software install or account required.
• APNG vs GIF: The Better Animated Image FormatWhy APNG beats GIF for animated images — true color, real transparency — and where GIF still wins.
• CSV vs Excel: Which Format Should You Use?The real differences between CSV and Excel (.xlsx) files — formatting, formulas, multiple sheets — and which one to pick for your data.
• CSV, JSON, and YAML: When to Use EachThe practical differences between CSV, JSON, and YAML — and which format actually fits your data, config, or API.
• Favicon Sizes: The Complete GuideEvery favicon size you actually need in 2026 — ICO, PNG, and apple-touch-icon — and why a single 16×16 icon isn't enough anymore.
• HEIC vs JPG: Why Your iPhone Photos Won't Open EverywhereWhy iPhone photos save as .heic, what makes the format different from JPG, and when you actually need to convert.
• How to Reduce Image File Size (Without Losing Quality)Practical ways to shrink an image's file size — format choice, quality settings, and resizing — without a visible quality hit.
• Regular Expressions: A Beginner's GuideThe regex building blocks that cover most real-world pattern matching — character classes, quantifiers, groups — explained plainly.
• SVG vs PNG: Which Should You Use?SVG and PNG solve different problems — vector vs. raster, infinite scaling vs. photographic detail. Here's how to choose.
• WCAG Contrast Ratios ExplainedWhat WCAG contrast ratios mean, the AA/AAA thresholds for normal and large text, and how to actually meet them.
• What Is a JWT?What a JSON Web Token actually contains, how signature verification works, and why you should never store sensitive data in one.
• What Is an ICO File?What an ICO file actually is, how it differs from a plain PNG, and when you genuinely need one instead of just using an image.