UtilityKit

500+ fast, free tools. Most run in your browser only; Image & PDF tools upload files to the backend when you run them.

PDF Sign

Draw a signature on canvas and place it on any PDF page in your browser

About PDF Sign

PDF Sign lets you electronically sign PDF documents without uploading them anywhere. Open the tool, draw your signature on the canvas using a mouse, trackpad, or touchscreen, then click on the PDF page exactly where you want the signature to appear. The tool stamps the signature as a transparent PNG image directly into the PDF using pdf-lib — the full document never leaves your browser. You can pick the page from a dropdown, adjust the signature width with a slider, see a live preview overlay before committing, and download a signed file ready to email or archive. This is the fastest way to handle a one-off signature when you do not want to install Adobe Acrobat, hand the document to a third-party SaaS, or print/scan/sign/scan again. Works on phones, tablets, and laptops in any modern browser. Files are processed locally — UtilityKit never sees the original or signed copies.

Why use PDF Sign

100% Browser-Side

The PDF and your signature image never leave your device — perfect for confidential agreements.

Mouse, Trackpad, or Touch

Draw with whatever input device you have — phones and tablets work just as well as laptops.

Visual Placement

A live yellow marker shows exactly where the signature will land before you commit.

Adjustable Width

Resize the signature with a slider so it matches the underlying signature line precisely.

Multi-Page Support

Pick the page that needs signing from a dropdown — works on documents of any length.

Free, No Signup

Sign as many PDFs as you need without an account, watermark, or paywall.

How to use PDF Sign

  1. Upload the PDF you want to sign — files up to 50 MB are accepted and stay in your browser.
  2. Draw your signature in the canvas pad using your mouse, trackpad, or touchscreen — click Clear to redo.
  3. Choose which page of the PDF should carry the signature using the page dropdown.
  4. Adjust the signature width slider so the stamp size matches the printed line on the page.
  5. Click anywhere on the rendered preview to set the signature position — a yellow marker shows the placement.
  6. Click Sign & Download PDF — the signed file downloads instantly with no upload.

When to use PDF Sign

  • When signing a one-off NDA, freelance contract, or rental agreement and you do not want to install desktop PDF software.
  • When you need to sign a confidential or legally privileged document that must not be uploaded to a third-party SaaS.
  • When you receive a PDF for signature on your phone and need to return it within minutes.
  • When the document only needs a visual signature mark, not a cryptographically verified digital certificate.
  • When school, HR, or government forms ask you to print, sign, scan and resend — and you can skip every step.
  • When you want to add initials, a visible 'approved' mark, or a simple drawn stamp on multiple PDFs in a row.

Examples

Freelance contract on phone

Input: agreement.pdf (4 pages), signed page 4 with finger on a phone, width 200px

Output: agreement-signed.pdf — signature visible on page 4 above the printed signature line, ready to email back

Tenancy lease initials

Input: lease.pdf (12 pages), signed pages 1, 4, 8, 12 with initials, width 80px

Output: Four downloads, one per page, each carrying the initials — uploaded sequentially

NDA on a desktop

Input: nda.pdf (2 pages), signed page 2 with mouse, width 240px

Output: nda-signed.pdf — clean signature in the bottom-right signature block, transparent background

Tips

  • Sign in landscape mode on a tablet for the most natural-looking signature — the wider canvas captures more nuance.
  • Set the width slider to roughly match the printed signature line under the signature box for the cleanest result.
  • If your signature looks jagged on a high-DPI display, try drawing more slowly so each stroke is captured smoothly.
  • For two signatures on the same document (e.g. signature + initials), download the signed file then re-upload it and add the second mark.
  • Always keep the original unsigned PDF until you have verified the signed copy looks correct on a desktop viewer.

Frequently Asked Questions

Is this a legally binding signature?▾
It is a typical 'electronic signature' as recognised under most jurisdictions (e.g. UETA in the US, eIDAS 'simple e-signature' in the EU) — sufficient for most everyday business documents. For a cryptographically signed and tamper-evident PDF (qualified or advanced e-signature), use a dedicated PKI-based signing tool such as Adobe Acrobat Sign or DocuSign.
Does my PDF leave my browser?▾
No. The PDF, the signature image, and the signed output all stay on your device. UtilityKit never receives any of the data.
Can I sign with a stylus or Apple Pencil?▾
Yes. The canvas pad supports any pointer input that the browser exposes, including Apple Pencil on iPad Safari and stylus input on Android tablets and Surface devices.
Why does my signature look pixelated when zoomed in?▾
The canvas is rendered at 380×160 pixels — large enough for typical signature blocks but not vector. If you need a vector signature, pre-make one in an SVG editor and use a PDF editor that supports SVG embedding.
Can I sign a password-protected PDF?▾
Encrypted PDFs need to be unlocked first — use the PDF Unlock tool with the correct password, then return to PDF Sign.
Can I add a date next to the signature?▾
Use the PDF Text Overlay Editor right after signing — upload the signed PDF, type the date, and click to place it next to the signature.
Does this work on iPhone or Android?▾
Yes. The canvas pad accepts touch input on iOS Safari and Chrome for Android, and the signed PDF downloads via the browser's Files / Downloads folder.
Can I save my signature for next time?▾
Not yet — the signature lives only in the current session. We are evaluating localStorage-based signature memory for a future release; until then, keep a transparent PNG handy and use a tool like PDF Form Filler if you want to re-use one.

Explore the category

PDF Page Count & Metadata Viewer View the page count and metadata (title, author, dates, encryption) of any PDF file in your browser. PDF Page Numbering Add page numbers to any PDF in your browser. Pick position, font size, start number, and download the numbered PDF. PDF Resize Page Size Change PDF page size to A4, US Letter, US Legal, A3, or custom dimensions. Rescales content to fit, in the browser. PDF Add Image Stamp a logo, signature, or watermark image onto every page or specific pages of a PDF. Drag-position from a corner. PDF to Text Convert any PDF document into a clean .txt file in your browser. Pick page range, preserve line breaks, copy or download. PDF Text Overlay Editor Add and place text on PDF pages with font, size, and color picker — browser-only
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Glossary

Electronic Signature
A digitised mark or image placed on a document to indicate intent to sign — distinct from a cryptographic digital signature with PKI.
pdf-lib
An open-source JavaScript library that creates and modifies PDF documents directly in the browser.
Canvas Pad
An HTML5 canvas element used to capture freehand drawing input from a mouse, trackpad, or touchscreen.
Embed PNG
Insert a transparent PNG image into a PDF page — what happens when your signature is added.
Page Coordinates
The X/Y position on a PDF page where the signature is placed, measured in PDF user-space units from the bottom-left corner.
Saddle-Stitch Output
Unrelated to signing — but useful if you later print the signed PDF as a booklet, see PDF Booklet Imposition.