📝 PDF 文字批注Annotate PDF

使用说明与常见问题How-to & FAQ

「PDF 文字批注」是什么？What is the Annotate PDF tool?

在 PDF 首页指定位置写入一行批注文字。本地处理。可设置「打开密码」、「批注」、「X」、「Y」、「字号」。Write a one-line text note onto the first page of a PDF. Processed locally. Settings: Password, Note, X, Y, Size.

如何使用「PDF 文字批注」？How do I use the Annotate PDF tool?

在「PDF 文字批注」中，选择或拖入文件，按需设置「批注」、「X」、「Y」、「字号」等选项，然后点击「写入」按钮即可。加密的 PDF 会提示输入密码（出现「打开密码」栏和「打开」按钮），输入密码并点「打开」后再继续。In the Annotate PDF: Choose or drop your files, set "Note", "X", "Y", "Size", then click "Stamp". For an encrypted PDF, the page asks for its password (a Password field and an Open button appear) — enter it, click Open, then continue.

X 和 Y 坐标怎么算？How do the X and Y coordinates work?

原点在第一页的左下角，单位是 pt（1/72 英寸）；X 向右增大，Y 向上增大，指的是文字基线的起点。A4 页面约 595 × 842 pt，所以 Y = 800 靠近顶部。The origin is the bottom-left corner of page 1 and the unit is the point (1/72 inch); X grows to the right and Y grows upward, marking the start of the text baseline. An A4 page is about 595 × 842 pt, so Y = 800 is near the top.

批注可以写中文吗？Can the note be Chinese?

可以。只含英文字母、数字和常见符号时使用 PDF 标准字体 Helvetica；含中文、日文、韩文等字符时会自动嵌入思源黑体（Noto Sans SC）中用到的字形。字体里没有的字符（例如部分表情符号）会提示错误，不会写成问号。Yes. Latin letters, digits and common symbols use the standard PDF font Helvetica; text with Chinese, Japanese or Korean characters automatically embeds the glyphs it uses from Noto Sans SC. Characters the font lacks (such as some emoji) give an error instead of being written as question marks.

坐标超出页面会怎样？What if the position is off the page?

X 和 Y 必须是 ≥ 0 的数字，并且落在第 1 页之内（例如 A4 页面 X 小于 595、Y 小于 842）。超出页面或留空时会显示错误，不会生成看不见批注的文件。生成后修改批注或坐标会自动重新写入。X and Y must be numbers ≥ 0 that fall inside page 1 (on an A4 page, X below 595 and Y below 842). Positions off the page or empty boxes show an error instead of producing a file with an invisible note. After the first run, editing the note or position re-stamps automatically.

有哪些选项可以调整？What options can I adjust?

「PDF 文字批注」的设置：「打开密码」可留空；「批注」默认 Reviewed；「X」默认 40；「Y」默认 40；「字号」默认 14；可选文件：PDF。每次生成结果都按当前设置处理。Settings in the Annotate PDF — "Password" optional; "Note" default Reviewed; "X" default 40; "Y" default 40; "Size" default 14; files: PDF. The result always uses the current settings.

「PDF 文字批注」免费吗？需要注册吗？Is the Annotate PDF free? Do I need an account?

「PDF 文字批注」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Annotate PDF is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.