How to use
Drop PDFs or click “Choose files” (several allowed). “Try a sample” lets you test it right away.
In the tabs on the right turn on only what you need — watermark, page numbers, Bates numbers — and set text, position, opacity and margins in mm.
Enter something like 1-3, 5, odd under “Target pages” to mark only some pages. Empty means every page.
The preview on the left is one page built by the same code as the export. The thumbnails let you look at other pages.
Press “Export” and download the PDF. With several files, save them one by one or as a ZIP.
What it does
Japanese watermarks and numbers, embedded
Latin-only text uses the standard PDF fonts and embeds nothing. Only when a mark contains Japanese is Noto Sans JP (SIL OFL 1.1) loaded from this site, and only the characters you use are embedded. The text in the exported PDF is selectable and searchable.
Check the exported PDF itself
The preview is a one-page PDF built by the same code as the export, then drawn. Page number positions and orientation on /Rotate pages look exactly as they will in the output.
Upright on rotated and cropped pages
Placement accounts for /Rotate (0, 90, 180, 270°), MediaBox / CropBox origins that are not (0, 0), and /UserUnit. Margins are in mm, and numbers sit at the visual bottom or top with text that reads upright.
Facing pages and cover exclusion
Formats {n}, {n} / {total}, - {n} -, Page {n} of {total}, {n} ページ and your own, a start number, and leaving out the first N pages. Swapping left and right on even pages keeps numbers on the outer edge.
Bates numbers across several PDFs
Set a prefix, zero-padded digits, a start number and a suffix, and the number runs on through the files in list order (e.g. ABC-000123). Reorder files with the up and down buttons; the result shows the first and last number of each file.
Original content kept
Annotations, form fields and bookmarks stay as they are; watermarks and numbers are added as extra drawing above or below the content. A one-line Japanese watermark adds only a few KB.
Use cases
- Put a diagonal “CONFIDENTIAL” or “DRAFT” watermark on every page of a document you send out
- Lay your company logo faintly behind the content
- Number pages from 1 after a cover, on the outer edge of facing pages
- Run a Bates number such as ABC-000123 through several PDFs of a contract or evidence set
Supported formats
Input
Output
Capability matrix
| Feature | Support | Notes |
|---|---|---|
| Text watermark (several lines, Japanese, colour, opacity, rotation) | Supported | Up to 5 lines of 40 characters |
| Image watermark (PNG / JPEG logo) | Supported | Width, opacity, rotation and position |
| Nine positions and tiled repetition | Supported | Up to 600 tiles per page |
| In front of or behind the content | Partial | Behind the content it is hidden under anything that fills the whole page, such as a scanned image |
| Page numbers (format, start, position, margin, facing pages, cover exclusion) | Supported | — |
| Bates numbers (prefix, digits, start, suffix, one sequence over several PDFs) | Supported | — |
| Target pages (all, ranges, odd / even) | Supported | With several files, the same entry is used for each file |
| Pages with /Rotate, CropBox and UserUnit | Supported | — |
| Keeping annotations, form fields and bookmarks | Supported | — |
| Selecting and searching text that contains Japanese | Supported | Typefaces: Noto Sans JP (regular, bold) and the standard font for Latin text only |
| Choosing a typeface, outlines, shadows, gradients | Not supported | — |
| Characters missing from the font, such as emoji | Not supported | You get an error message if you type one |
| Roman numerals (i, ii, iii) or restarting numbers per chapter | Not supported | — |
| Different content per file or per page | Not supported | The text is the same on all target pages (except numbers) |
| Removing or editing an existing watermark | Not supported | — |
| Vertical text | Not supported | — |
| Keeping an existing digital signature valid | Not supported | Exporting rewrites the PDF, which invalidates existing signatures |
| Password-protected PDFs | Not supported | — |
Limits & notes
- PDFs up to 300 MB each and 100 files at once. Logo images are PNG / JPEG up to 20 MB and 36 megapixels.
- Watermark text: up to 5 lines of 40 characters. Page number format: 60 characters. Bates prefix and suffix: 30 characters each, 1–12 digits.
- Font size 4–400 pt, margins 0–100 mm. The page number start can be up to 999,999 and the Bates start up to 999,999,999.
- Only when Japanese is used, the font (Noto Sans JP regular or bold, about 5.5 MB each, up to about 11 MB if both are used) is loaded the first time. Once loaded it also works offline.
- {total} is “start number + numbered pages − 1”, i.e. the last number printed. With a cover left out it is smaller than the page count.
- When target pages are chosen, page numbers run consecutively over them (pages 2, 4, 6 become 1, 2, 3). Turn on “Number by position in the file” to use each page’s position instead ({total} is then the file’s last page).
- Password-protected PDFs cannot be opened.
Privacy & safety
Opening, previewing and exporting all happen in your browser; neither your PDFs, your logo nor the text you type is sent to a server. The Japanese font is served by this site itself, with no external font service. The text you enter is not sent to analytics.
FAQ
How do I add a Japanese watermark such as 社外秘 to a PDF?
Can I still select and search the text of a watermarked PDF?
What happens to page numbers when I choose target pages?
How do I start numbering at 1 on the page after the cover?
How do I put numbers on the outer edge of facing pages?
What is a Bates number, and can it run through several PDFs?
Related tools
Images to PDF
Drop images, put them in order and get one PDF. Choose page size, orientation and margins; phone photos are rotated correctly. Images are converted on your device and never uploaded.
Compress PDF
Drop a PDF to cut its size. Only photos and scans are recompressed, so text and graphics stay crisp. Your PDF is processed on your device and never uploaded.
PDF Editor
Lay text (Japanese included), shapes, arrows, a highlighter, freehand drawing and images on top of a PDF, and fill in its form fields. Everything is written as PDF vectors and real text, never as a picture. Rewriting the original text and true redaction are not possible.
PDF Extract
Take the text, images, links, attachments, form values and bookmarks embedded in a PDF, for the pages you choose. Images stay as embedded (JPEG untouched). Your PDF never leaves your device.
Extract PDF Pages
Gather just the pages you need from one or more PDFs into a single PDF (or one PDF per source file in a ZIP). Pick by thumbnail, range or text search, and leave out blank pages automatically. Your PDFs are processed on your device and never uploaded.
Merge PDF
Drop several PDFs, put them in order, and get one PDF. You can also choose which pages to take from each file. Nothing is uploaded — merging happens on your device.
Last updated: