PDF Editor — what it does
One place to fix the small things about a PDF that normally mean opening three different apps: rotate and reorder pages, delete pages or insert blanks, trim the crop margins, stamp a watermark, and add text, highlight or freehand marks. Pages are rendered from the file in your browser, so a client contract or an HR file is never uploaded to fix a sideways page.
How to use PDF Editor
- Open the PDF. Every page appears in the thumbnail grid and the preview canvas shows the page you are working on.
- Fix the structure first — drag to reorder, select and delete pages, rotate the page that scanned sideways, or insert a blank page where a signature belongs.
- Trim the crop margins if the scan has a dark scanner edge; set it once and apply it to every page.
- Add the overlay you need: typed text, a highlighter mark, or a freehand annotation. For a draft, stamp a text watermark across all pages.
- Export. The edited document downloads as a new file, so the original you opened stays untouched.
Worked example: an agreement that came back from the printer wrong
A 12-page agreement scans with pages 4 and 5 upside down and two centimetres of dark scanner edge on every page. Rotate those two pages in the grid, set the crop once and apply it everywhere, add a CONFIDENTIAL watermark because the file is still a draft, then export — a couple of minutes of work, and the client's file has not left the laptop. The signed-print original stays in the drawer, unaltered.
At a glance
| What it handles | Rotate, reorder, delete, insert blanks, crop margins, watermark, text / highlight / freehand marks |
|---|---|
| Rendering | On-device with pdf-lib — the browser reads the file straight from your disk |
| Watermark | Text or logo image, centred, diagonal or tiled, adjustable opacity |
| Best for | Scanned agreements, HR files, draft documents, submission bundles |
| Not for | Retyping or reflowing body text — use PDF Text Editor to change words that are already in the file |
Frequently asked questions
- What is PDF Editor?
- Edit a PDF in one place: rotate, reorder, delete and insert blank pages from thumbnails, trim the crop margins, stamp a watermark and add text / highlight / freehand annotations — then export. Fully on-device with pdf-lib.
- Is PDF Editor free to use?
- Yes — PDF Editor is free to use, with no sign-up, no install and no account.
- Does PDF Editor upload or store my data?
- No — PDF Editor runs entirely in your browser, so your text, files and results never leave your device.
- Do I need to install anything to use PDF Editor?
- No — it works in any modern browser (Chrome, Edge, Firefox, Safari) with no downloads, accounts or plugins.
- Can I undo a change before exporting?
- Structural edits (order, deleted pages, inserted blanks, crop) live in the editor's own state, so you can put a page back before you export. Once you export, the change is baked into the new file — which is why the tool always writes a new download instead of overwriting the document you opened.
- Does editing break a digital signature if the PDF is already signed?
- Yes, and that is how signatures work rather than a limitation of this tool: any change to the document's bytes invalidates the signature. Annotate unsigned copies, and keep the signed original as the record.