أداة: Text size calculator
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Characters on screen are not always bytes on disk: UTF-8 uses one byte for ASCII letters but up to four for some emoji or CJK code points. Storage quotas, SMS segments, and Blob sizes in browsers all care about encoding-aware counts—this page helps you sanity-check paste payloads before they blow API limits.
متى تستخدمها
Sizing JSON bodies for Lambda limits, estimating CDN payload for inlined SVG, or explaining why a "280 character" tweet overflows when rich Unicode enters the mix. Compare with أداة: Character counter when you need words/lines too.
UTF-16 versus UTF-8?
Windows APIs and JavaScript string indices historically used UTF-16 code units; wire formats usually UTF-8—know which layer you measure.