Open your PDF locally, create a signature by drawing, typing, or uploading a PNG, place it on the page, and download the flattened file. pdf-lib processes in a Web Worker — your file never uploads.

Is online document signing legal?

In most jurisdictions, a sign document electronically workflow with intent and consent is valid for everyday agreements. Consult counsel for regulated contracts. Our tool embeds a flattened signature in the PDF locally.

Can I draw vs type my signature?

Yes. Draw with mouse or touch, type in cursive fonts for a handwritten look, or upload a transparent PNG. All three modes flatten into the document.

Does my file upload to your servers?

No. Processing is 100% local in a browser Web Worker. Your PDF bytes never leave your device — there is nothing for us to store.

What is PDF flattening for signatures?

Flattening merges your signature layer into page content so it cannot be moved or removed easily — cryptographic integrity for your online PDF signature.

Can I sign PDF online for free?

Yes. Standard single-document sign PDF jobs are free with no account. Multi-signer routing, collaborative signing, and unlimited bulk require Premium via Lemon Squeezy.

Is this a secure pdf signer?

Yes. Because files never upload, confidential contracts stay on-device. A pdf signer with zero-knowledge architecture — not a cloud retention service.

Canonical Sign PDF Tool

Sign PDF Online — PDF Signer & E-Signature Tool

Need to sign PDF online without sending files to a server? Our pdf signer runs entirely in your browser — draw, type, or upload a signature, place it on any page, and flatten the result so your online PDF signature is embedded in the document. Sign document electronically with zero-knowledge processing: your sign PDF document bytes never leave your device. Basic single-document signing is free and instant with no signup.

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JPG to PNG

JPG → PNG·Converted on our edge network

Drag & drop files here

or browse to upload

JPG → PNG

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or browse to upload

JPG → PNG

How it works

1
Open your PDF locally
Select a PDF from your device. A pdf-lib Web Worker loads it in Tier 1 local processing — zero server upload, so you can sign PDF document files with absolute privacy.
2
Create and place your signature
Draw with your mouse or finger, type in cursive fonts, or upload a transparent PNG. Our pdf signing tool lets you place signature on PDF pages and flatten for cryptographic integrity — no cloud processing.
3
Download the signed PDF
Export your file instantly. Basic sign PDF jobs are free with no signup; multi-signer routing, collaborative signing, and unlimited bulk require Premium via Lemon Squeezy.

Use cases

Sign contracts before sending

Sign PDF document agreements locally — online document signing without uploading confidential terms to a third party.

Approve internal forms

Use our pdf signer to sign document electronically on HR packets and policy acknowledgments in one browser tab.

Counter-sign client deliverables

Add an online PDF signature to proposals and SOWs — a pdf signing tool that keeps bytes on your machine.

Learn how to sign a PDF once

Draw, type, or upload once, save a flattened copy, and reuse your signature image for future sign PDF online workflows.

Problems we solve

Upload-based tools leak files

Most online document signing services send your PDF to a remote server. Ours processes 100% locally — your file never leaves the device.

Desktop subscriptions for simple signatures

Skip expensive Acrobat plans for a one-time sign. This pdf signing tool runs free in any modern browser.

Non-flattened signatures that move

Overlay-only stamps detach when pages reflow. PDF flattening embeds your signature in the document for cryptographic integrity.

Specialized Sign PDF guides

Trust & privacy

100% local browser processing

pdf-lib Web Worker handles sign PDF jobs entirely on your machine — no cloud upload, no retention risk.

Draw, type, or upload signatures

Handwritten draw mode, cursive type fonts, or transparent PNG upload — place signature on PDF with grid positioning.

Free basic signing

Everyday sign PDF online tasks are free with no signup. Premium unlocks multi-signer routing and unlimited bulk via Lemon Squeezy.