Sign PDF

Sign PDF adds a visible signature image to the pages you choose and saves a new copy. You can draw, type or upload a signature. The PDF is edited and saved in your browser, so it never leaves your device.

How to sign a PDF

1. Drop your PDF onto the tool or click Choose file.
2. Create a signature with Draw, Type or Upload.
3. Drag it onto the page preview and set its width.
4. Move between pages and place it on each page that needs signing.
5. Check the signed-page list and the warning.
6. Click Sign N pages, then download <original-name>-signed.pdf. The original is unchanged.

Draw, type or upload a signature

Draw and Type produce a transparent PNG image of your signature; Upload keeps a PNG's transparency or a JPG's background.

Draw gives you a canvas that accepts a mouse, finger or stylus. Strokes are smoothed and use the screen's pixel density; Clear resets the box. The image is cropped to the ink, so a signature drawn in a large box does not become tiny on the page. Drawing needs a pointing device; Type and Upload work with a keyboard.

Type turns a name into a signature image using a font on your device. Choose script, serif or sans and a type size. The size affects sharpness, while the width slider on the page sets the visible size. The result is a picture, so the PDF does not need the font. The lettering you see depends on the fonts on your device, but the saved image is fixed.

Upload accepts a PNG or JPG up to 10 MB. The tool checks the actual image data and shows the filename, dimensions and format. PNG transparency is preserved; a JPG keeps its background, usually white, so a white box may cover the page. Change signature replaces the image while keeping the pages where it is already placed.

Placing and resizing the signature

The preview shows the page as a PDF reader displays it. A page with no placement shows a dashed signature near the lower right; drag it to place it. Once placed, the signature has an outline and handle and can be dragged anywhere inside the page. The whole image stays on the page.

The width slider sets the signature width as a percentage of the displayed page width, starting at 30%. Each page keeps its own width, and a very tall image is reduced to fit the page height. With the placed signature focused, arrow keys nudge it, Shift takes larger steps, and Delete removes it. You can also use the Place on this page and Remove from this page buttons.

Signing multiple pages

Use the previous and next buttons or type a page number. Each page holds one placement, and moving between pages does not lose earlier ones. The summary lists every signed page, and the page chips jump to them; pages without a placement are saved unchanged.

Page sizes and orientations are handled page by page. The preview includes any rotation stored in the PDF, and the saved signature stays upright at the chosen position. Width is a percentage of each page's own displayed width.

What this tool is and is not

This adds a visible image of a signature, not a certificate-based digital signature. It uses no private key, certificate or hash, so it cannot prove who signed or detect later changes. Anyone can copy the image, reuse it or edit the PDF afterwards. There is no identity check, timestamp, audit trail or tamper-evident seal.

It is not a replacement for an e-signature platform where a verified audit trail is required. If a contract, form or filing needs a qualified or verified signature, use the process that body specifies.

Adding content also affects existing digital signatures: a PDF that already carries one will normally show it as invalid after saving, because the signed bytes changed. Keep the original untouched if that signature matters. A visible signature may not be legally valid in every situation; acceptance varies by document, jurisdiction and recipient, so check before relying on it.

Quality and what is preserved

The tool opens a copy, draws the signature and saves it. Pages are not re-rendered, so text usually stays selectable and images keep their quality; links, bookmarks, form fields and page labels are normally preserved.

The image is embedded once and reused on every signed page. A high-resolution upload can still add noticeably to the PDF. Drawn signatures are exported at about 1000 pixels wide, and typed ones at up to twice the chosen type size. Uploaded images can only be as sharp as the source. PNG transparency and a JPG's background are kept.

Limitations

• Password-protected PDFs cannot be opened. Save an unprotected copy first.
• Existing digital signatures may be invalidated.
• Scanned documents work as a background, but the tool does not recognise text or fill signature fields.
• Complex forms such as XFA documents may not survive the rewrite; fill them in before signing.
• Signature images can be copied. A picture does not prove who added it.
• JPG backgrounds are visible and may cover nearby text; a transparent PNG avoids this.
• Very large PDFs or images depend on your browser's memory, especially on phones.
• Unusual page boxes may shift placement slightly in other PDF readers; check the download.

Common uses

A visible signature suits offers, letters, internal approvals, timesheets, invoices, permission slips, tenancy paperwork, consent forms and simple agreements. For a formal contract that needs a verifiable signing record, use the platform required by the other party.

Privacy

The PDF and signature are processed by your browser. Nothing is uploaded, and there is no account. The signature stays in the tab's memory; closing or reloading clears it.

Related PDF tools

• To number the pages before or after signing, use Add Page Numbers to PDF.
• To add a draft or confidentiality mark, use Watermark PDF.
• To fill a fillable form before signing it, use Fill PDF Forms.
• To trim the page margins before placing the signature, use Crop PDF.
• To reorder, rotate or remove pages first, use Organize PDF.
• To combine signed pages with other documents, use Merge PDF.

Sign PDF FAQ

Is this a digital signature?

No. It adds a picture of a signature. A certificate-based digital signature uses cryptography to identify the signer and show whether the file changed; this tool does neither.

Is my PDF uploaded anywhere?

No. The file is read, previewed, edited and saved by your browser and never sent to a server. Closing the tab clears the working copy and the signature.

Can I sign more than one page?

Yes. Place it on the current page, move to another page and place it again. Each page keeps its own placement and width; pages without one are saved unchanged.

Does it work with a scanned PDF?

Yes, if the PDF opens in your browser. The tool does not read the scan, fill a signature field or verify anything; it draws the image over the page. A clear scan and a transparent PNG work best.

Why does my uploaded signature show a white box?

That usually means you uploaded a JPG. JPGs do not store transparency, so the background is drawn too. Export the signature as a transparent PNG instead.

Will existing signatures stop working?

Existing certificate-based signatures will usually become invalid, because adding the image changes the file. Visible signature images already on the page remain, but they are only pictures. Keep the original if a prior digital signature matters.

Can I remove a signature after saving?

The tool does not erase content from an existing PDF. Keep the original and run the tool again, or use a PDF editor that can delete or cover the image.