一份 300 页的扫描件要按章节发给三个人、一大份合同只需要其中两页、扫描歪了要整体转向——这些都是「按页处理」。本文讲清每 N 页拆一份、页码范围的写法、提取与删页的区别、批量旋转，以及拆分文件的命名规则。附免费在线拆分工具，纯浏览器本地处理。
四种按页操作怎么选
「拆分 PDF」其实是一个操作族，按你要的结果选模式：
| 模式 | 输入 → 输出 | 典型场景 |
|---|
| 每 N 页一档 | 1 个文件 → 多个等长文件 | 按固定厚度分发：300 页按 50 页一份发给 6 个人 |
| 自定义范围 | 1 个文件 → 多个不等长文件 | 按章节切：1-12 章一份、13-20 章一份 |
| 提取所选页 | 1 个文件 → 1 个新文件 | 只要合同里的签字页和金额页 |
| 删页 | 1 个文件 → 1 个瘦身后文件 | 去掉空白页、重复页、作废页 |
| 旋转 | 1 个文件 → 1 个转向后文件 | 横向扫描的页面批量转向 |
前两种「一拆多」的输出自动打包成 ZIP；后三种「一改一」的结果直接下载单个 PDF。
页码范围语法详解
「自定义范围」「提取」「删页」「旋转」共用同一套页码语法：
2 → 第 2 页
1-3 → 第 1 到 3 页
1-3, 5 → 第 1-3 页 + 第 5 页
1-3, 5, 8-10 → 三段：1-3、5、8-10
规则要点：
- 逗号分隔：英文逗号、中文逗号、顿号、分号都能识别，随手输入不会报错。
- 页码从 1 开始：第 1 页就是 1，与阅读器页码栏一致。
- 区间必须从小到大：
5-2 不合法；工具会直接指出是哪一段写错了。
- 超出总页数会报错：10 页的文件里写
15 会被拒绝，防止拿到空文件。
「自定义范围」模式还有一条特殊规则：重叠区间自动合并——1-3 与 2-5 合并为 1-5，保证每页只出现在一个输出文件里，不会重复出现在两份文件中。
这两个模式容易混淆，一句话区分：提取是「只要这几页」，删页是「去掉这几页」。
- 300 页合同只要签字页（第 4 页）和报价页（第 40 页）→ 提取
4, 40，得到 2 页的新文件。
- 300 页报告要删掉空白页（第 11、87 页）→ 删页
11, 87，得到 298 页的文件。
经验法则：要留下的页少用提取，要删的页少用删页——输入的页码越少越不容易出错。
批量旋转：歪的扫描件救回来
扫描仪进纸方向不对、手机拍照扫描横竖混排，都会产生「横躺」的页面。旋转模式两个参数：
- 哪些页：留空就是全部页；也可以只写
3-7 这类局部范围。
- 角度：顺时针 90° / 180° / 270°。横躺 90° 的页面转 270°（即逆时针 90°）就正了。
旋转写入的是页面自身的 /Rotate 属性——所有阅读器与打印机都会遵循，保存后查看和打印都是转向后的方向，不用再手动设置。
输出命名与 ZIP 打包
输出文件的命名规则一目了然：
| 操作 | 输出文件名（原文件为 报告.pdf） |
|---|
| 每 N 页 / 自定义范围 | 报告-1-3.pdf、报告-4-6.pdf、报告-5.pdf（单页不含区间） |
| 提取 | 报告-extracted.pdf |
| 删页 | 报告-trimmed.pdf |
| 旋转 | 报告-rotated.pdf |
多个输出会自动打包成一个 报告-split.zip，解压后按文件名排序即可直接使用。全部处理在浏览器本地完成，文件不经过网络。
常见问题
Q：页码范围「1-3, 5, 8-10」是什么意思？
A：三段页码：1 到 3 页、第 5 页、8 到 10 页。逗号分隔，单数字是一页，连字符是区间，页码从 1 开始。
Q：拆分后文件的内容和画质会变吗？
A：不会。拆分只搬运页面，不重编码、不缩放，画质与内容与原文件一致。
Q：自定义范围的重叠页会重复出现吗？
A：不会。重叠区间自动合并（1-3 与 2-5 → 1-5），每页只出现在一个输出文件里。
Q：怎么把一份 PDF 拆成单页？
A：「每 N 页一档」把 N 设为 1，输出自动打包 ZIP；注意输出上限（本站 200 个）。
Q：「提取所选页」和「删页」有什么区别？
A：提取是「只要这几页」，删页是「去掉这几页」。留下的少用提取，要删的少用删页。
Q：旋转保存后打印方向也会转过来吗？
A：会。旋转写入页面 /Rotate 属性，阅读器与打印机都会遵循。
免费在线拆分 PDF
每 N 页 / 自定义范围 / 提取 / 删页 / 旋转 · 多输出自动 ZIP · 纯浏览器本地处理
打开拆分 PDF 工具 →
Choosing an Operation
"Split PDF" is really a family of page-level operations. Pick by the result you want:
| Mode | Input → Output | Typical use |
|---|
| Every N pages | 1 file → several equal files | Fixed-size distribution: 300 pages split by 50 for six people |
| Custom ranges | 1 file → several unequal files | By chapter: pages 1-12 in one file, 13-20 in another |
| Extract pages | 1 file → 1 new file | You only need the signature page and the pricing page |
| Remove pages | 1 file → 1 slimmer file | Drop blank, duplicate, or voided pages |
| Rotate | 1 file → 1 turned file | Batch-fix landscape-scanned pages |
The first two "one-to-many" modes zip their outputs automatically; the three "one-to-one" edits download a single PDF directly.
Range Syntax in Detail
"Custom ranges", "extract", "remove", and "rotate" share one page-range syntax:
2 → page 2
1-3 → pages 1 to 3
1-3, 5 → pages 1-3 plus page 5
1-3, 5, 8-10 → three parts: 1-3, 5, 8-10
The rules:
- Comma-separated: English commas, Chinese commas, enumeration commas, and semicolons all work.
- Pages start at 1: matching the page field in your PDF reader.
- Ranges go small-to-large:
5-2 is invalid; the tool points at the offending part.
- Out-of-range fails loudly: page 15 in a 10-page file is rejected, so you never get an empty file.
One special rule in "Custom ranges": overlapping ranges merge — 1-3 and 2-5 become 1-5, so every page lands in exactly one output file.
These two are easily confused. One line: extract means "keep only these pages"; remove means "drop these pages".
- From a 300-page contract you need the signature page (4) and pricing page (40) → extract
4, 40 for a 2-page file.
- A 300-page report has blank pages (11, 87) → remove
11, 87 for a 298-page file.
Rule of thumb: few pages to keep → extract; few pages to drop → remove — shorter input means fewer mistakes.
Bulk Rotation for Sideways Scans
Wrong feeder direction or mixed phone-scan orientation leaves pages lying on their side. Rotation takes two parameters:
- Which pages: empty means all; or a partial range like
3-7.
- Angle: clockwise 90° / 180° / 270°. A page lying 90° sideways becomes upright with 270° (counterclockwise 90°).
Rotation writes the page's own /Rotate attribute — every reader and printer honors it, so viewing and printing both come out turned, with no manual settings afterwards.
Output Naming & ZIP
Output names are self-explanatory (source file: report.pdf):
| Operation | Output names |
|---|
| Every N / custom ranges | report-1-3.pdf, report-4-6.pdf, report-5.pdf (single pages omit the range) |
| Extract | report-extracted.pdf |
| Remove | report-trimmed.pdf |
| Rotate | report-rotated.pdf |
Multiple outputs are zipped into report-split.zip; unzip and the files sort themselves. Everything runs locally in your browser — files never touch the network.
FAQ
Q: What does "1-3, 5, 8-10" mean?
A: Three parts: pages 1-3, page 5, pages 8-10. Commas separate parts; a single number is one page; a hyphen joins a range; pages start at 1.
Q: Does splitting change content or quality?
A: No. Splitting only moves pages — no re-encoding, no scaling, identical content and quality.
Q: Do overlapping ranges duplicate pages?
A: No. Overlaps merge automatically (1-3 and 2-5 → 1-5), so each page lands in exactly one output.
Q: How do I split a PDF into single pages?
A: Set N to 1 in "Every N pages"; outputs are zipped automatically. Watch the output cap (200 here).
Q: Extract vs remove — which one?
A: Extract keeps only the pages you list; remove drops them. Few pages to keep → extract; few to drop → remove.
Q: Will printing respect the rotation?
A: Yes. Rotation is written to the page's /Rotate attribute, which readers and printers both honor.
Free Online PDF Splitter
Every N pages / ranges / extract / remove / rotate · Auto-zip · 100% browser-local
Open Split PDF Tool →
PDF Merge Guide
Which files belong together, how to decide the order, what to do when a huge merge fails, and upload-tool privacy risks.
PDF Compress Guide
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JPG to PDF Guide
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