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Why don’t websites allow spaces as characters in usernames and passwords?

Dr. Aris Thorne
Dr. Aris Thorne
Senior Science Editor · Apr 11, 2026 · Updated Apr 13, 2026

Shitty developers is really the only reason. You could argue that if I put in a password of "12345 " …did I mean it or was the space accidental? If it's accidental and I don't realise I did it, next time I login I won't be able to, because I'll be putting in "12345" which won't match.

111
Words

1 min
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#88
of 500 in Space & Astronomy

+63%
vs Category Avg

The Short Answer

Shitty developers is really the only reason. You could argue that if I put in a password of "12345 " …did I mean it or was the space accidental? If it's accidental and I don't realise I did it, next time I login I won't be able to, because I'll be putting in "12345" which won't match. The workaround here is to force users to confirm their passwords. So type it in once, type it in again, if there is a space in both then the user meant to put it there. However, it annoys me. Many sites allow it, many sites don't. Office 365 is a good example of a huge website that doesn't.

Analysis

Key Concepts: Space, accidental, don't

This explanation focuses on space, accidental, don't and spans 111 words across 8 sentences. At 63% above the average Space & Astronomy explanation (68 words), this is one of the more thorough answers in this category, reflecting the complexity of the underlying question.

What This Answer Covers

The explanation opens with: “Shitty developers is really the only reason.” It then elaborates by presenting a contrasting perspective, ultimately building toward a complete picture across 8 connected points.

How This Compares in Space & Astronomy

Ranked #88 of 500 Space & Astronomy questions by answer depth (top 18%). This places it in the comprehensive tier — the top quarter of most thoroughly answered questions. Questions at this depth typically involve multi-faceted topics requiring nuanced explanation.

Frequently Asked Questions

Is there a simple explanation for why websites allow spaces as characters in usernames and passwords?

Shitty developers is really the only reason. You could argue that if I put in a password of "12345 " …did I mean it or was the space accidental? If it's accidental and I don't realise I did it, next time I login I won't be able to, because I'll be…

How detailed is this explanation compared to similar Space & Astronomy questions?

This is one of the most thorough answer at 111 words, ranked #88 of 500 Space & Astronomy questions by depth. The key concepts covered are space, accidental, don't.

What approach does this answer take to explain websites allow spaces as characters in usernames and passwor?

The explanation uses root cause analysis and concrete examples and contrasting perspectives across 111 words. It is categorized under Space & Astronomy and addresses the question through 3 analytical lenses.