PDF Signer

Source{{ sourceBadge }} Mark{{ signatureMethodLabel }} Trust modelVisual only

Source PDF:

{{ hasFile ? sourceFileSummary : 'Drop a PDF or browse from your device.' }}

{{ sourceError || (loadingFile ? 'Reading the PDF locally…' : 'No upload or backend signing step.') }}

The sample is generated in this browser for a quick placement check.

Signature source:

Choose the visible mark that will be embedded into the selected page.

Typed signature:

Use the name or short acknowledgement mark that should appear on the page.

Draw signature:

{{ hasDrawnSignature ? 'Drawn mark ready.' : 'Draw inside the pad before creating the PDF.' }}

Signature image:

{{ hasSignatureImage ? signatureImage.name : 'Drop a PNG or JPG here' }}

{{ hasSignatureImage ? signatureImageSummary : 'Drop one image or browse from your device.' }}

{{ signatureImageError || 'Maximum 5 MB; image bytes stay in this browser.' }}

Signature page:

{{ pageCount ? `Loaded document: ${pageCount} ${pageCount === 1 ? 'page' : 'pages'}.` : 'The placement plan uses a sample US Letter page until a PDF is loaded.' }}

page

Placement:

Bottom right is a common starting point for approval blocks and signature lines.

Signature width:

{{ normalizedSignatureWidth }} pt

Scale the visible mark while the placement model keeps the complete stamp box inside the page.

Label line:

The label is printed below the visible signature mark.

Ink color:

Use a dark color for reliable contrast on scans and forms.

Hex

Use #RRGGBB format.

Creates a visual page stamp only. It does not create a certificate-backed digital signature or PAdES validation chain.

Horizontal offset:

The neutral default is 0 pt.

Vertical offset:

The neutral default is 0 pt.

Output filename:

Leave blank to append “-signed” to the source filename.

Browser work limit:

The default local rewrite cap is 75 MB.

Signed PDF

The chart renderer is unavailable. Exact placement values remain in the ledger.

Signal	Value	Meaning	Copy
{{ row.label }}	{{ row.value }}	{{ row.detail }}

A name placed on a PDF page is easy to see. The harder question is what that mark is meant to prove. In many office workflows, a visible signature simply shows that someone reviewed, acknowledged, or approved a document whose identity and history are already established elsewhere.

That visible mark can be typed text, a hand-drawn stroke, or an image copied from a signature. It changes the appearance of the page, much like adding a stamp. It does not automatically identify the signer, show when consent was captured, reveal later edits, or give a PDF reader a certificate chain to validate.

Visual signature mark: Page content that a reader can see. It suits low-risk acknowledgement when the surrounding process already provides enough trust.
Certificate-based digital signature: Cryptographic PDF data that can connect a certificate to document integrity and can be checked by compatible PDF software.
Signing record: Evidence kept by a broader workflow, such as authentication, consent, timestamps, delivery history, or an audit trail.

Placement still matters even when the mark is purely visual. A signature can cover form text, land on the wrong physical page, or lose its meaning when separated from a nearby approval line. PDF page positions also need care because printed page labels may not match the file's first, second, or third page, and rotated pages can make an apparently sensible corner placement look wrong.

A signer-and-date label improves human review but does not strengthen the cryptographic evidence. The date records the browser's current calendar date when the copy is created; it is not a trusted timestamp. Likewise, a familiar signature image may look convincing without proving who supplied it.

Use a visible mark where the recipient expects a readable acknowledgement and the surrounding process supplies the needed trust. Use an approved certificate-based or e-signature service when identity, tamper evidence, regulated records, durable validation, or dispute resistance matters.

How to Use This Tool:

Load one PDF, prepare one visible mark, then verify the target page and stamp box before creating the copy.

Choose Source PDF or load the sample. The PDF must be readable, contain no more than 500 pages, and stay within the selected Browser work limit.
Select Signature source. Type a name, draw on the pad, or upload one PNG or JPG image no larger than 5 MB.
Set Signature page, Placement, and Signature width. Page numbering follows physical file order; a requested page beyond the end resolves to the final page and is marked for review.
Choose the optional Label line and ink colour. The label can add the signer, the current date, both, or neither. Uploaded images keep their own colours.
Open Advanced only when the corner or centre preset needs adjustment. Horizontal and vertical offsets move the stamp in points, while the placement rule keeps the complete box inside the page.
Create the PDF when the readiness checks show that the file, signature, page, work limit, and placement all pass. Download the result and inspect the stamped page in a PDF reader before sending it.

Interpreting Results:

Signed PDF means a new copy was created with visible page content. It does not mean the signer was authenticated or that the file contains a certificate-backed signature.

Confirm the mark appears on the intended physical page and does not cover important text.
Check Placement ledger when an offset reaches a page edge, the page is rotated, or the stamp footprint looks unexpectedly large.
Treat the signer/date label as readable text, not as trusted identity or time evidence.

A successful rewrite only proves that the browser produced a PDF copy. Open the file after download because page rotation, unusual crop boxes, encryption, forms, and existing document structure can affect the practical result.

Technical Details:

A visual PDF signature is an image-and-text stamping operation in PDF user space. Page dimensions and placement coordinates are measured in points, where 72 points equal one inch. The anchor is the lower-left corner of the complete stamp box, including the optional label.

Mechanism Core

Visual PDF signature mechanism
Stage	Rule	Consequence
Prepare mark	Typed and drawn marks become PNG images. Uploaded PNG and JPG images retain their source colours and aspect ratio.	The result is page artwork, not a certificate object.
Size stamp	Width is 72 to 300 pt. Typed and drawn marks use a height-to-width ratio of 0.25; an uploaded image uses its decoded ratio, limited to 0.05 to 5.	A label adds 18 pt to the complete stamp height.
Choose anchor	Top, bottom, and side presets start 42 pt from the relevant edge; centre presets use the remaining page space.	Offsets of -240 to 240 pt are applied after the preset anchor is chosen.
Keep inside page	Each coordinate is clamped to the page boundary after offsets are added.	The ledger reports whether either axis reached a boundary.
Write copy	The image, underline, and optional 9 pt label are drawn on one selected page, then the PDF is saved as a new file.	The source file remains unchanged in the browser.

Formula Core

The mark height follows its height-to-width ratio, and the label is added beneath it. The occupied percentage compares the rectangular stamp box with the rectangular page area.

\begin{array}{l} H_{mark} & = & W_{stamp} \times r \\ H_{stamp} & = & H_{mark} + H_{label} \\ footprint & = & 100 \times \frac{W_{stamp} \times H_{stamp}}{W_{page} \times H_{page}} \end{array}

Here, r is image height divided by image width. Dimensions remain at full precision for placement; the ledger rounds displayed point values and the footprint percentage for readability.

The final coordinates apply the selected offsets and then enforce the page boundary. This prevents the box from extending beyond the page even when the requested offset would do so.

\begin{array}{l} x & = & \min (\max (x_{0} + Δx, 0), W_{page} - W_{stamp}) \\ y & = & \min (\max (y_{0} + Δy, 0), H_{page} - H_{stamp}) \end{array}

The placement model rejects a stamp wider or taller than the selected page. It also rejects non-finite dimensions, unsupported presets, and values outside the declared ranges instead of silently producing an invalid coordinate.

Limitations and Privacy Notes:

The PDF and signature bytes stay in the active browser session and are not uploaded by this tool. Supporting browser code may still need to load before processing can begin.

The adjustable browser work limit ranges from 10 to 200 MB; 200 MB is also the hard PDF cap.
Encrypted, damaged, or unusually structured PDFs may fail to load or save.
Only one page receives the mark in each generated copy.
No signer authentication, certificate, revocation check, trusted timestamp, PAdES profile, or tamper-evident validation chain is created.
Anyone who can access an uploaded signature image may be able to reuse it. Protect the source image as sensitive personal data.

Worked Examples:

Internal approval form

A one-page approval form already travels through an authenticated staff system. A typed name with Signer and date at Bottom right creates a readable acknowledgement copy. The recipient should still rely on the staff system, not the page mark alone, for identity and history.

Rotated final page

A landscape signature page is stored with a rotation value. After selecting the final physical page, the readiness list asks for visual inspection. Open the downloaded PDF and check the actual orientation; move the stamp with offsets or use a different placement preset if it lands away from the printed signature line.

References:

PDF Reference, Sixth Edition, version 1.7, Adobe Systems Incorporated, November 2006.
Validate digital signatures in Adobe Acrobat, Adobe.