KeroTools

Sign a PDF Online — Free & Private

Sign a PDF and place your signature exactly where it belongs — right in your browser. Your file never leaves your device, and there are no watermarks or sign-ups.

No uploads — 100% privateRuns in your browserFree, no account needed

Drop PDF here or click to browse

PDF files only

Your document and signature never leave your device

Nothing to delete later

Secure connection

Works in every modern browser

How it works

  1. 1

    Add your PDF

    Drop the PDF onto the page or click to browse and select it.

  2. 2

    Add your signature

    Draw it, type it, or upload an image of your signature.

  3. 3

    Place & download

    Drag it onto the signature line, then download the signed PDF from your browser.

Why use this tool

Sign without printing

Add your signature on screen — no printer, scanner, or paper needed.

Private by design

Signing happens locally in your browser — your document is never uploaded.

Place it precisely

Drag your signature to the right spot and size it to fit the line.

No watermark

Only your signature is added — nothing else is stamped onto the page.

Free & unlimited

No account, no trial, no per-file charges — sign as many PDFs as you need.

Works on any device

Phone, tablet, or computer — it runs in the browser you already have.

What does signing a PDF do?

Signing a PDF places your signature onto the document on screen, so you can return a signed copy without the print-sign-scan routine. You draw, type, or upload your signature once, drag it onto the signature line, and download a finished PDF that looks exactly like a hand-signed page. It is the quickest way to complete a form, contract, or agreement that arrived as a PDF. Because this tool runs entirely in your browser, both the document and your signature stay on your own device and are never uploaded, which matters for anything you are putting your name to.

When should you sign a PDF?

Sign a PDF whenever a document needs your signature and you would rather not print it. People sign rental agreements, job offers, consent forms, and NDAs this way; freelancers sign contracts and send them straight back; and anyone completing a school or government form can add their signature and return it in minutes. It is especially useful on a phone, where printing is impractical — you receive the PDF, sign it, and send it back from the same device.

How to get the best results

Create a clean signature first: drawing works best with a finger or stylus on a touch screen, while uploading a photo of your signature on white paper gives a crisp result on any device. Size the signature to match the line rather than dwarfing it, and place it precisely so it looks natural. If the form has a date field or initials boxes, fill those too before saving. Keep the signed file safe, since it now carries your signature, and hold on to the original unsigned copy for your records.

Limitations to be aware of

This tool adds a visible, drawn signature — the kind most everyday forms and agreements ask for. It is not the same as a cryptographic digital signature that certifies identity through a certificate authority; if a document specifically requires a qualified electronic signature, use a service built for that standard. A visible signature is legally accepted for the vast majority of common agreements, but for high-stakes legal documents, check what type of signature the other party requires before you send it back.

Common mistakes and how to avoid them

The most common mistake is a signature that is too large or badly placed, which looks unprofessional — size it to the line and position it carefully. Another is signing the wrong copy or forgetting a required date or initials field; check the whole form before saving. People also sometimes assume every document accepts a drawn signature, but a few require a certified digital one, so confirm first. Finally, keep both the signed and the original unsigned files for your records.

Using it on mobile and desktop

On a phone, this replaces printing entirely: open the PDF, draw your signature with a finger, place it, and send the signed copy back — all locally, with nothing uploaded. On a computer, upload an image of your signature or draw with a trackpad, then position it precisely on longer contracts. Because there is no app to install, the same link works on every device, and the signed PDF opens the same for whoever receives it.

Why sign here instead of another site?

A document you are about to sign is often one of the most sensitive files you handle — a contract, an agreement, a form with personal details — and most online signing tools ask you to upload it to their servers. This tool never uploads your file or your signature; everything happens inside your browser. There are no watermarks, no account, and no limit on how many documents you sign. For putting your name to a private document, keeping it on your own device is the only sensible approach.

How it compares

FeatureThis toolTypical online PDF tools
File uploaded to a serverNever — signed in your browserUsually uploaded
Draw, type, or upload signatureYesVaries
Drag to positionYesUsually
Watermark on outputNoSometimes
Account or sign-upNot requiredOften required
PriceFreeFree / paid tiers

Features

Draw, type, or upload

Create a signature by hand, from text, or from an image you already have.

Drag to position

Move and resize the signature so it sits neatly on the line.

Add dates and initials

Place extra marks like a date or your initials where needed.

Keeps the document intact

The rest of the PDF is untouched — only your signature is added.

No installation

Nothing to download or install — it works on the web page.

Offline-capable

Once the page has loaded, signing works even without internet.

Arabic & RTL friendly

Full interface in eight languages, including right-to-left Arabic.

Secure by default

Served over HTTPS, with no file tracking and no third-party upload.

Who uses it

Freelancers

Sign a contract and send it straight back without printing anything.

Renters & job seekers

Sign an agreement or offer letter from a phone in minutes.

Parents & students

Complete and sign a school or consent form and return it the same day.

Everyday users

Add a signature to a PDF form without a printer or scanner — privately.

Frequently Asked Questions

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