Firmar PDF

Agrega tu firma a documentos PDF. Dibuja, sube o escribe tu firma — todo el procesamiento se realiza localmente en tu navegador.

Arrastra y suelta tu PDF aquí

Tamaño máximo: 128 MB

Tus archivos nunca salen de tu dispositivo. Todo el procesamiento se realiza localmente en tu navegador.

Firmar PDF de contrato — Escribir o dibujar firma gratis, sin subir

Sign any PDF contract — freelance agreement, NDA, sales quote, lease — without DocuSign or uploading it. Drop the PDF, drag your signature onto the signature line, save. Runs entirely in your browser via pdf-lib — your contract and signature never leave your device. Free, no account.

100% FreeNo UploadNo Sign-upLegally-Binding E-Sign

Cómo Usar

  1. Upload Contract PDF: Drop the PDF contract in. The tool accepts any PDF: standard contracts, multi-page agreements, scanned contracts. We process 1-100 page documents without issues.
  2. Place Signature: Click on the signature line position to add a signature box. Drag it to the right spot on the page. Resize if needed. Add date, initials, name, or title as separate text fields if required.
  3. Sign (Type or Draw): Three signing modes: type your name (rendered in 5+ signature-style fonts), draw with mouse/touch on a canvas, or upload a scan of your handwritten signature. All three are saved locally and embedded in the PDF.
  4. Save Signed PDF: Click 'Save'. The signed PDF is downloaded with the signature burned into the page. Email it to the counterparty. Optional: add password protection via PDF Encrypt before sending confidential contracts.

Por Qué Elegir Esta Herramienta

  • 100% Local Processing: Files are processed entirely in your browser using JavaScript — never uploaded to any server.
  • No Limits: No file count or file size restrictions. Process as many files as your device can handle.
  • No Sign-up: Free forever, no account needed, no email required. Open the page and start.
  • Private by Design: Nothing is sent to any server. Close the tab and your files are gone forever.

Preguntas Frecuentes

Can I sign a contract PDF without uploading it?

Yes — our PDF Sign tool runs entirely in your browser. Drop your contract, place a signature, type/draw/upload your signature, save. The signed PDF is created locally via pdf-lib. No upload, no DocuSign account, no third-party storage.

Is an electronic signature legally binding?

In most jurisdictions (US, EU, UK, Canada, Australia, etc.), yes — under eIDAS in the EU and the E-SIGN Act in the US. Our signatures meet basic requirements: signer attribution, intent to sign, document integrity. For high-stakes agreements (real estate, certain regulated industries), consult a lawyer about additional requirements.

What's the difference between typed, drawn, and uploaded signatures?

Typed: type your name and we render it in a cursive-style font. Visually clean and easy to edit. Drawn: use mouse/finger/touch to draw your signature on a canvas. Most authentic-looking. Uploaded: scan your handwritten signature once (use a signature pad, paper scan, or photo) and reuse it across all future documents. All three are equally legally binding in most jurisdictions.

Can I save my signature for reuse?

Yes — once you create a signature (drawn or uploaded), our tool offers to save it to browser localStorage. Next time you sign a PDF, just pick your saved signature from the list. Stored only on your device, never sent anywhere.

Will the signed PDF look like the original?

Yes — our tool embeds the signature on top of the original PDF without modifying any other content. The signature appears at the position you placed it, with the size you chose. Background watermark-free, formatting unchanged, ready for email or printing.

Can I add multiple signatures to one contract?

Yes — drop multiple signature boxes. Useful for two-party agreements, multi-page contracts with initialled pages, or counter-signed documents. Each signature can be from a different person with their own signature style.

Otros casos de uso de Firmar PDF

Herramientas patrocinadas para este caso de uso

Patrocinado Mejor oferta

PDF Agile

Si necesitas edición de PDF más profunda que una herramienta gratuita de navegador, PDF Agile maneja reflow de texto y redacción en un solo lugar.

Nuestra herramienta conserva el diseño al fusionar o dividir, pero no permite editar texto en su lugar — PDF Agile sí.

Saber más

Patrocinado Recomendado

Wondershare PDFelement

Cuando superas una herramienta de un solo propósito, PDFelement combina edición, OCR, conversión y firma electrónica en un mismo paquete de escritorio de pago.

Nos centramos en navegador y gratis; PDFelement añade pulido de escritorio para funciones avanzadas como la numeración Bates.

Saber más