Guides
Short, practical guides that explain the how and why behind our tools — pick a topic and jump straight to the tool that does it.
2 min read
How to Compress an Image Below 200 KB
A step-by-step method to get a photo or graphic under 200 KB without it looking bad — which format to pick, what quality to use, and when to resize.
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1 min read
JPEG vs PNG vs WebP for Websites
When to use JPEG, PNG or WebP on the web — how each handles photos, transparency and file size, with a simple rule you can apply every time.
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1 min read
WCAG Color Contrast Explained: AA vs AAA
What the WCAG contrast ratios mean, the exact AA and AAA thresholds for normal and large text, and how to check a colour pair correctly.
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1 min read
Instagram Reels & TikTok Safe Zones (2026)
Where captions, usernames and buttons cover your video on Reels and TikTok — and how to keep your key content inside the safe zone at 1080×1920.
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1 min read
UUID v4 vs UUID v7: Which Should You Use?
The practical difference between random UUID v4 and time-ordered UUID v7, with code examples and when each is the right choice for database keys.
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1 min read
How to Calculate Business Days Between Two Dates
What counts as a business day, how to count them between two dates, and how to handle public holidays — with a worked example.
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1 min read
How to Verify a File with a Checksum (SHA-256)
Why downloads publish a hash, how to check a file's SHA-256 against it, and which algorithm to trust — a plain-English integrity guide.
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