Keep Nth Page
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What is Keep Nth Page?
Keep Nth Page extracts every Nth page from a PDF, discarding the rest. With N set to 2, it keeps pages 1, 3, 5, 7, and so on — effectively selecting every other page. With N set to 3, it keeps pages 1, 4, 7, and so on.
The tool uses pdf-lib to iterate through the source document, copy every Nth page by index, and write a new PDF containing only the selected pages. The extraction is lossless — page content, fonts, images, and annotations are preserved at their original quality.
Page 1 is always kept. The tool counts from the first page and selects every Nth page thereafter. This means with N=2, you get the odd-numbered pages (1, 3, 5, ...); with N=3, you get pages 1, 4, 7, 10, and so on.
How to Use Keep Nth Page
- Drop a PDF file onto the upload zone, or click to browse and select it. The tool reads the document and determines the total page count.
- Set N — the interval. The tool keeps every Nth page starting from page 1. Default is 2 (every other page). With N=2 and a 10-page document, you get pages 1, 3, 5, 7, 9 (5 pages). With N=3, you get pages 1, 4, 7 (3 pages).
- Click Keep Nth Page. The tool iterates through the source document, selects pages at the specified interval, copies them into a new PDF, and writes the output.
- A download button appears with your file, named
nth-pages.pdf. The output contains only the selected pages in their original order.
Why Use Keep Nth Page?
Scanned double-sided documents interleave front and back pages consecutively. Keeping every Nth page separates one side of the document from the other — useful when you only need the front or back of a set of scanned pages.
Sampling is another common use: extracting every 5th or 10th page from a long document gives a quick overview without processing the entire file. This is useful for quality checks on large scan batches or for creating preview extracts from lengthy reports.
Presentation handouts sometimes need every other slide (skipping title slides or transition slides). Keep Nth Page with N=2 produces a condensed version with only the content slides.
Privacy & Security
Your files never leave your browser. Every step — reading, selecting, and writing the output — happens on your own device. Nothing is uploaded to Racira's servers, no copies are stored in the cloud, and no file data is transmitted at any point.
Frequently Asked Questions
Which page is considered the first?
Page 1 (the first page of the document) is always kept. With N=2, the tool keeps pages 1, 3, 5, 7, etc. — always starting from the first page. The first page is never skipped regardless of the interval.
Can I keep pages starting from a different position?
Not directly — the tool always starts from page 1. To start from a different position, first extract the desired starting range with the Extract Pages tool, then apply Keep Nth Page to the result.
What happens if the page count isn't evenly divisible by N?
The tool keeps whatever pages fall on the Nth interval. A 10-page document with N=3 keeps pages 1, 4, 7 (3 pages). The remaining pages are simply not included — there's no rounding or padding.
Can I keep every page except every Nth?
Not directly. To remove every Nth page instead of keeping it, first extract all pages, then use the Delete Pages tool to remove the specific positions you want to exclude.
What if I want to keep pages in a different pattern?
For non-uniform patterns (e.g. keep 2, skip 1), use the Extract Pages tool with a custom range string like 1-2, 4-5, 7-8 to define exactly which pages to keep.
Does the output file size change proportionally?
Roughly yes. Keeping every Nth page produces approximately 1/N of the original page count. A 100-page document with N=5 produces about 20 pages.