扁平化 PDF
锁定已填写的表单字段，使其无法再被编辑。
使用方法
上传已填写的 PDF 表单并下载结果——表单字段当前的值会被烧录进页面，字段随之被移除。
对 PDF 表单来说，“扁平化”是什么意思？
它会把填入或勾选到表单字段中的内容永久烧录进页面内容，并移除可交互的字段，使其无法再被编辑或覆盖。
如果我的 PDF 没有表单字段怎么办？
不会有任何变化——工具会检测到没有可扁平化的表单，并原样返回文件。
Why would I need to flatten a form?
To lock in your answers before sending a filled form somewhere it shouldn't be editable anymore — like a signed application or a submitted PDF form.
Can I still fill out the form after flattening?
No — flattening removes the interactive fields entirely, converting your entries into permanent page content.
Does flattening affect checkboxes and dropdowns too, or just text fields?
All field types — text boxes, checkboxes, radio buttons, and dropdowns are all baked into the page and their interactive versions removed.
Does this also flatten comments, highlights, or stamps — not just form fields?
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Can I undo flattening once it's done?
No. Once you download the flattened file, the field values are permanent page content and the fields themselves are gone — there's no way to get the editable version back from it. Keep a copy of your filled-in form before you flatten it if you might need to change an answer later.