📏 按行长度过滤文本Filter Lines by Length
按每行的字数筛选文本：保留或删除长度在指定范围内的行，可按字符数或字节数计算，并可按长度排序，适合清洗词表、关键词和日志。Filter lines by length: keep or drop lines whose length falls in a range, counted in characters or bytes, and optionally sort by length — great for cleaning word lists, keywords and logs.
使用说明与常见问题How-to & FAQ
「按行长度过滤文本」是什么？What is the Filter Lines by Length tool?
按每行的字数筛选文本：保留或删除长度在指定范围内的行，可按字符数或字节数计算，并可按长度排序，适合清洗词表、关键词和日志。Filter lines by length: keep or drop lines whose length falls in a range, counted in characters or bytes, and optionally sort by length — great for cleaning word lists, keywords and logs.
如何使用「按行长度过滤文本」？How do I use the Filter Lines by Length?
粘贴多行文本，填写最小和最大长度（留空表示不限），选择保留还是删除这些行。中文一个字算 1 个字符；选择「UTF-8 字节」时一个汉字算 3 字节。Paste lines, enter the minimum and maximum length (blank = no limit) and choose whether to keep or drop matching lines. Each Chinese character counts as 1 character, or 3 when counting UTF-8 bytes.
为什么同一行用字节数算出来更长？Why is the byte count larger?
UTF-8 中英文字母、数字占 1 字节，常用汉字占 3 字节，Emoji 占 4 字节。数据库 VARCHAR 按字节限制时应选择字节计数。In UTF-8 Latin letters and digits take 1 byte, common Chinese characters 3 and emoji 4. Use bytes when a database column limits bytes.
「宽度」是什么？What is Width?
按等宽显示时的占位宽度计算：中文、日文、韩文和全角符号算 2，其他算 1，适合对齐终端或表格。Display width in a monospace font: CJK and full-width characters count 2, others 1 — useful for aligning terminals or tables.
「按行长度过滤文本」免费吗？数据会上传吗？Is the Filter Lines by Length free? Is my data uploaded?
「按行长度过滤文本」完全免费，无需注册或安装，手机和电脑都能用；所有处理都在你的浏览器本地完成，输入的内容和文件不会上传到服务器。The Filter Lines by Length is completely free with no sign-up or install and works on phones and desktops; everything runs locally in your browser and nothing you enter is uploaded.