Online Tools Blog, Guides & Tips

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Picking colours from an image: click the middle, not the edge

Large images are scaled to fit the canvas, so edge pixels are blends of their neighbours. Why a photograph has no single colour, how JPEG compression shifts values, and when hex or RGB is the better form.

Tool Guides October 15, 2026 3 Min. Lesezeit

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Tool Guides October 15, 2026 4 Min. Lesezeit

The errors grammar checkers catch, invent and miss

Mechanics, grammar and style are three different jobs. Where false positives cluster, what slips past every checker, and how to take the corrections without losing your voice.

Tool Guides October 15, 2026 2 Min. Lesezeit

Why the same emoji produces a different number of groups in two different tools here

This one uses UTF-16 code units and gets two groups; the Binary Translator uses UTF-8 bytes and gets four — both correct, just different encodings of the identical character. Why every group is padded to a fixed width, and why this only converts in one direction.

Tool Guides October 14, 2026 3 Min. Lesezeit

Why frame count limits this tool, not video length

A twenty-minute video is comfortable at one frame a second and impossible at every frame, because time and memory scale with frames captured rather than minutes of footage. Why Firefox can occasionally repeat or skip a frame, and why JPEG beats PNG here almost every time.

Tool Guides October 14, 2026 3 Min. Lesezeit

Fancy fonts are characters, and screen readers spell them out

These are Unicode code points that resemble styled letters, not a typeface. Why a styled bio is unusable with assistive technology, why the text is unsearchable, and where the styles run out of characters.

Tool Guides October 14, 2026 5 Min. Lesezeit

Writing an invoice that gets paid

The reader is someone in accounts who has never heard of the project. What the document has to carry, line items that avoid a query, and stating the currency and the tax rather than assuming them.

Tool Guides October 13, 2026 5 Min. Lesezeit

WCAG contrast: the thresholds, and the elements everyone forgets

The ratio measures light rather than colour, which is why distinct-looking colours fail. Which threshold applies where, why focus rings and placeholders are the usual culprits, and how to fix a failure without redesigning.

Tool Guides October 13, 2026 2 Min. Lesezeit

What a SHA-256 hash actually proves, and what it does not

Matching a file's digest against a published one confirms it was not altered — it says nothing about who made it. Why this is the wrong tool for storing a password, and why the same input always produces the same digest, for better and for worse.

Tool Guides October 13, 2026 5 Min. Lesezeit

The meta tags that still do something, and the ones that never did

Four tags earn their place in the head and most of the rest are decoration. Which are which, what Open Graph is for, and why two of everything is the commonest fault.

Tool Guides October 12, 2026 4 Min. Lesezeit

Image formats: converting to PNG does not restore a JPEG

Renaming an extension does not change a format, and a lossless format preserves artefacts rather than removing them. Which format to choose, why AVIF sometimes refuses, and why to resize before converting.

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