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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.

On-device・No upload

Your files and input are processed only inside your browser on this device and are never uploaded to our servers.

Drop a file here

or

PDFs are processed in this browser on your device and never uploaded.Accepts: PDFUp to 300 MB per filePaste (Ctrl+V) also works

How to use

  1. Drop a PDF or click “Choose files”. “Try a sample” opens a form to play with.

  2. Pick “Text”, “Rectangle”, “Arrow”, “Highlighter”, “Pen”, “Image” or “White-out” above, then click or drag on the page. Colour, width and font size are on the right.

  3. With “Select”, click an added item: drag to move, drag a corner ■ to resize, the ● above to rotate. Keys (arrows, + / -, [ ], Delete), Undo and Redo work too.

  4. For a PDF with fields, enter values in the “Form” tab. The “Pages” tab rotates and deletes pages and inserts blank ones.

  5. Press “Export PDF”, check the preview drawn by pdf.js, and download. You can keep editing after exporting.

What it does

Real, searchable text

Text with Japanese characters embeds only the needed glyphs of Noto Sans JP (a subset); Latin text uses the standard fonts. It is PDF text, not an image, so it can be searched and copied after export. The font (about 5 MB) is fetched once, only when you type Japanese.

Shapes, arrows, highlights and pen as vectors

Rectangles, ellipses, lines, arrows, the highlighter and the pen are written as PDF drawing commands (paths), so they stay sharp at any zoom. The highlighter is translucent with Multiply blending, so the text below stays readable. The pen thins its points into a smooth curve.

Correct on rotated and cropped pages

Coordinates account for the page’s /Rotate (0, 90, 180, 270°), CropBox offsets and UserUnit, so items land exactly where and how you see them.

Form filling (AcroForm) and flattening

Fill text fields, checkboxes, radio buttons, combo boxes and list boxes and save. Japanese values are drawn with an embedded font in the field appearance. Fields without an appearance, and fields in a PDF that asks viewers to redraw them (NeedAppearances), are drawn on export as well. Multi-line fields wrap Japanese too, and an “auto” font size becomes the largest of 12–6 pt that fits. “Flatten” turns fields into page content, only if you choose it.

The rest of the PDF is kept

The file is edited in place, so existing annotations, bookmarks, form fields and metadata stay. A deleted page is emptied before it is dropped, and values of fields that lived only on it, and its structure information (such as alternative text in a tagged PDF), do not remain in the file.

Check the exported PDF

The exported file is drawn again by pdf.js, so you see the real output before you download. Until you export, every added item can be edited again.

Use cases

  • Fill in an application or notification form PDF, including Japanese, and save it
  • Add “Approved” or “Confidential” text, arrows, boxes or highlights to a document PDF
  • Mark up a drawing or screenshot PDF with hand-drawn circles and lines
  • Delete unneeded pages, turn sideways pages upright and insert blank pages

Supported formats

Input

PDF (.pdf)Images to add (PNG, JPEG)

Output

PDF (.pdf)

Capability matrix

FeatureSupportNotes
Add text (Japanese, multiple lines, size, colour, bold)SupportedReal, searchable text. Japanese embeds a Noto Sans JP subset
Add shapes (rectangle, ellipse, line, arrow)SupportedLine width, colour, fill and opacity; written as vectors
HighlighterSupportedTranslucent rectangle with Multiply blending
Pen (freehand)SupportedBecomes a vector path with thinned points
Add images (PNG / JPEG)Supported—
White-out (a white rectangle on top)PartialOnly hides: the text or image underneath stays in the PDF and can be copied and searched
True redaction (deleting the content underneath)Not supportedNot supported. Share Safe Check can verify black-box redaction
Rewriting or editing existing textNot supportedLay new text on top instead
Moving or deleting existing images, shapes or textNot supported—
Form filling (text, checkbox, radio, combo, list)SupportedJapanese values use an embedded font in the appearance
Flattening formsSupportedOptional. Fields without an appearance are just removed
XFA formsPartialHybrid forms are always saved without their XFA part (layout and calculations that rely on XFA are lost); XFA-only forms are not supported
Automatic calculation and validation (JavaScript)Not supportedFormulas are not run, so fill in totals yourself
Rotate and delete pages, insert blank pagesSupported—
Reorder, duplicate or extract pagesNot supportedUse PDF Organize
Keeping existing annotations, bookmarks and formsPartialA bookmark that pointed to a deleted page keeps its title but no longer jumps anywhere; links to it are removed
Removing everything of a deleted pagePartialText, field values, structure information and destinations are removed. Pictures and fonts that all pages share are removed only when the pages that stay can be read and do not use them
Re-editing added items in the exported PDFNot supportedEditable until you export; afterwards they are ordinary PDF drawing
Keeping or adding digital signaturesNot supportedExporting invalidates an existing digital signature
Password-protected PDFsNot supported—

Limits & notes

  • PDFs up to 300 MB. Up to 500 added items.
  • A text item takes up to 2,000 characters and 60 lines. Font size is 6–120 pt on screen and line width 0–20 pt.
  • Images are PNG / JPEG, up to 20 MB and 36 megapixels each.
  • A pen stroke is thinned to at most 400 points.
  • A form value takes up to 5,000 characters. Characters Noto Sans JP does not have, such as emoji, cannot be used.
  • If you type Japanese, the Japanese font (about 5 MB) is fetched once when you export.
  • Password-protected PDFs cannot be opened.

Privacy & safety

Viewing, editing, form filling and exporting all happen in your browser; neither your PDF nor the images and text you add are sent to a server. The Japanese font is served from this site, with no external server involved.

FAQ

Can I add Japanese text to a PDF?
Yes. Pick “Text”, click the page and type in the “Text” box on the right. Japanese embeds only the needed glyphs of Noto Sans JP; Latin text uses the standard fonts. It is PDF text, not an image, so it stays searchable and copyable after export. The Japanese font (about 5 MB) is fetched once, only when you type Japanese.
Does white-out really delete the text underneath?
No. White-out lays a white rectangle on top, so the text or image underneath stays inside the PDF and can be copied, searched or extracted by other tools. This tool has no true redaction that deletes the content. To hide personal data before sharing, check the result with Share Safe Check, which can verify black-box redaction.
Can I rewrite the text that is already in the PDF?
No, editing existing text is not supported. You can cover it with a white-out and lay new text on top, but the original text stays in the PDF (white-out only hides). To replace it completely, edit the original file in the app that made it.
If I fill in a form and save, do the values remain when I reopen it? Does Japanese work?
Yes. Values are saved as the values of the PDF’s form fields (AcroForm), so Acrobat and other viewers show them. Japanese values work too; the field appearance is drawn with an embedded font. “Flatten” turns the fields into page content, after which they can no longer be edited as fields. XFA-only forms are not supported.
Can I edit added shapes and text later?
Until you export, you can select, move, resize, rotate, recolour or delete them, and undo / redo. After exporting you can keep editing and export again. But once you reopen the exported PDF, the added items are ordinary PDF drawing and cannot be edited individually, here or elsewhere.
What about deleting or rotating pages, and existing annotations and bookmarks?
You can rotate and delete pages and insert blank ones; use PDF Organize to reorder. The file is edited in place, so existing annotations, bookmarks and form fields stay. The content of a deleted page does not remain. A bookmark that pointed at it keeps its title but no longer jumps anywhere, and links to it are removed. A digitally signed PDF loses its signature when exported.

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