Open the app — PDF Page Editor
Sometimes you receive a 300-page collection when all you need is three pages.
Other times you want to pull pieces from several files and bind them into one.
Typing page numbers like 12-15, 47, 88-92 invites mistakes.
Numbers alone don’t tell you what is actually on those pages.
So this was built as a way to cut while looking.
You drop dividers onto a horizontal bar and toggle green (keep) and red (remove).
Up to five files can be loaded at once and bound into a single merged.pdf.
How to Use
Basic Steps
- Drag PDF files in or click to upload — from one file up to five.
- Click a file card to select what you’re working on. Unselected cards dim.
- Add a divider with [Add Divider] or the A key.
- Drag the divider handle to the page boundary you want.
- Click a timeline segment or a thumbnail below to switch it between keep and remove.
- Check the order with [Preview], then press [Merge Kept Pages into PDF] to download
merged.pdf.
Working with Files
With several files open it’s easy to lose track of which one you’re editing.
That’s why only the selected card stays sharp while the rest fade. The card with the purple border is the one you’re working on.
You can click a card or use a shortcut.
| Shortcut | Action |
|---|---|
Ctrl+Shift+1~5 (⌘+Shift+1~5 on macOS) | Select file 1–5 |
A | Add a divider to the selected file |
ESC | Close the preview window |
A shortcut badge sits beside each card so you don’t have to memorize anything. It shows ⌘⇧1 or Ctrl+Shift+1 to match your OS.
Shortcuts are ignored while the cursor is in an input box, so typing numbers won’t trigger something unexpected.
Each card header carries three buttons.
| Button | What it does |
|---|---|
| Add Divider | Inserts a divider at the middle of the longest segment in that file |
| ↑ / ↓ | Moves the file up or down in order |
| ✕ | Removes the file (with a confirmation) |
There’s a reason a new divider lands “in the middle of the longest segment.”
A new divider is usually meant to break up the widest stretch you haven’t divided yet.
Reordering files renumbers the shortcuts as well, and the merged output follows the new order.
The Timeline and Dividers
One horizontal bar represents all the pages in that file.
- The divider handle shows the boundary pages as
before | after. - The handle position is aligned exactly with the tick marks below. A divider between pages 5 and 6 sits precisely over tick
5. - Delete a divider with the ✕ above it and the two neighbouring segments merge back into one.
- A file can hold up to five dividers.
Keep and Remove
Colors tell you which is which. Green keeps, red removes.
Click the segment on the timeline or the thumbnail below — either one flips both.
Thumbnails marked for removal get a red diagonal X drawn corner to corner, so it registers immediately even when scanning many at once.
Divider Thumbnails
What you really want to know when placing a divider is what sits on either side of that boundary.
So two pages, before and after each divider, are always shown right under the timeline.
- The pair is wrapped in a dashed card, so you can tell which divider they belong to.
- A purple curve links each divider to its thumbnail group, and the curve follows as you drag the divider.
- Thumbnails keep the original aspect ratio. As dividers multiply their height shrinks automatically to fit on one row.
Unifying Page Size
Merging several files often mixes A4 and B5 into a ragged result. Choose from three options.
| Option | What happens |
|---|---|
| Keep original size (default) | Each page keeps its size, text, and rotation |
| Fit to smallest page | Others shrink proportionally around the smallest page and are centred |
| Fit to largest page | Others enlarge proportionally around the largest page and are centred |
If you’re printing, matching sizes is better; if you must preserve the originals, leave the default.
Matching sizes can make text harder to search — the reason is explained below.
Preview
Press [Preview], to the left of the merge button, to see the order the result will take.
It shows one continuous sequence rather than grouping by file, because that’s exactly how the PDF will look.
Displaying everything would run too long, so only the first and last pages, plus the start and end of each kept segment, appear as large thumbnails, with dots (⋯) standing in between.
Each thumbnail is labelled filename — page number so you know where it came from.
Close it by clicking the overlay, the ✕, or ESC.
Good to Know
Merge Rules
Kept segments are collected in order from each file, then joined in file order into a single PDF.
The filename is always merged.pdf, however many files you combined.
Why Matching Sizes Hurts Search
Keep original size duplicates pages wholesale. Quality, text, and rotation all survive.
It’s the same lossless method used by the PDF Left-Right Splitter.
Unifying size, by contrast, wraps each page in a form and draws it onto a new page.
There’s no way around that if the size must change, and in the process the text layer structure shifts, which can break searching.
So choose keep-original for material where search matters, and unify-size when the printed shape has to match.
Notes
- Large files or very high page counts take time. Buttons lock automatically during processing so nothing runs twice.
- All processing happens in the browser and no file is sent to a server.
Pairs Well With
For material scanned as open spreads, split it first with the PDF Left-Right Splitter, then pick out what you need here.
Open the app — PDF Page Editor