UTF-8 · Vixyun · Tools & Content https://vixyun.top/tags/utf-8/ 2 posts tagged “UTF-8”. Hugo en Mon, 19 Oct 2026 10:30:00 +0800 How Big Does This QR Code Need to Be: Bytes, Versions, and What Level H Costs https://vixyun.top/posts/qr-code-size-version-and-level/ Mon, 19 Oct 2026 10:30:00 +0800 https://vixyun.top/posts/qr-code-size-version-and-level/ A QR version is a size, not a quality: what your text costs in bits, which level pushes it into a bigger grid, and how many millimetres that needs on paper. Base64 with Chinese and emoji: why btoa throws and atob returns mojibake https://vixyun.top/posts/base64-encoding-chinese/ Sun, 04 Oct 2026 10:00:00 +0800 https://vixyun.top/posts/base64-encoding-chinese/ btoa('你好') throws and atob returns mojibake because Base64 works on bytes, not characters. The UTF-8 round trip, padding, why + breaks tokens, base64url.