Firmar PDF en línea - Añade una firma al PDF gratis, en el navegador

Sube el PDF, escribe una firma estilizada, dibuja una con el ratón o el dedo, o sube un PNG transparente de tu firma escaneada. Arrástrala hasta el campo de firma, añade las iniciales en los márgenes y descarga un PDF firmado que se abre sin problemas en cualquier lector.

En la mayoría de las jurisdicciones, sí: la ESIGN Act de EE. UU., el reglamento eIDAS de la UE, la Electronic Communications Act del Reino Unido y la IT Act de India reconocen las firmas electrónicas simples para contratos habituales (ofertas de empleo, acuerdos de confidencialidad, contratos freelance, facturas). Las transacciones de alto valor pueden requerir firmas electrónicas cualificadas.

Sí. Añade campos de firma para cada parte, guarda el PDF firmado parcialmente, envíalo al siguiente firmante y deja que añada su firma en el espacio asignado. El registro de auditoría (quién firmó y cuándo) queda incrustado en los metadatos del PDF.

Coloca una firma, las iniciales y un sello de fecha desde la barra de herramientas en cualquier página. El sello de fecha usa la fecha de hoy de forma predeterminada, pero puedes cambiarla. Aplana el PDF al descargarlo para que los destinatarios no puedan modificar la ubicación de la firma.

Page previews render locally, but signing itself happens on our secure server: your document and signature image are uploaded over HTTPS, stamped into the PDF there, and deleted automatically afterwards — we never store or share them. That works well for everyday paperwork like employment contracts and NDAs; if your policy requires a signer that never uploads the file at all, use an offline desktop PDF tool instead.

Sí. Activa «Aplanar y bloquear al descargar» y las firmas, las iniciales y la fecha quedan incrustadas en la página. Combinado con el paso opcional de protección con contraseña, el documento queda a prueba de manipulaciones.

Esta herramienta añade una firma electrónica — una imagen visible de tu firma dibujada, escrita o subida, estampada en la página — que es legalmente válida para acuerdos cotidianos como acuerdos de confidencialidad, ofertas y facturas. No crea una firma digital basada en certificado (la de tipo criptográfico que Acrobat verifica frente a un certificado .p12 / PKI). Para documentos de rutina, una firma electrónica es lo que necesitas; para documentación que debe ser verificable criptográficamente contra manipulaciones, usa un servicio de firma basado en certificado.

Esta herramienta se centra en firmas, iniciales, fechas y sellos que colocas en cualquier parte de la página. Si tu PDF tiene campos de formulario interactivos — casillas de verificación, campos de texto, listas desplegables — para completar, usa nuestra herramienta Rellenar formulario PDF para llenarlos primero y luego vuelve aquí para añadir tu firma.

Yes — switch to the Text tab and type your paragraph, then pick a font family (Sans, Serif, Mono or Handwritten), a text color, and drag the size slider to set how large it renders on the page. Bold and italic toggle buttons next to the size slider let you emphasize the text without leaving the tool.

In the Signature tab, choose the Type mode, enter your name, then pick from eight cursive font styles — Caveat, Dancing Script, Great Vibes, Sacramento, Allura, Pacifico, Homemade Apple or Kalam — shown as live previews of your own name. Each renders a different handwriting look, so you can match the tone of the document you're signing.

Open the Date tab, pick a day with the date field or tap Today for the current date, then choose a format from the dropdown — MM/DD/YYYY, DD/MM/YYYY, YYYY-MM-DD, Month DD, YYYY, or DD Month YYYY. The live preview under the format picker shows exactly how the stamped date will look before you place it, and you can still adjust its font, color and size like the text tool.

Yes — in the Stamp tab, choose Create mode and enter your company name plus a short line like APPROVED, PAID or DRAFT; the tool generates a circular stamp graphic in the color you pick with the color field. If you already have a real company stamp image, switch to Upload mode instead and use that PNG or JPG directly.

Use the Signature tab (Type mode with a cursive font, or Draw if you prefer your real signature) to place your name, then switch to the Date tab and pick a format like Month DD, YYYY with Today selected for a professional-looking date stamp. Finally, add a Stamp in Create mode reading APPROVED in your brand color to mark the document reviewed — all three can be dragged and resized independently on the same page before you download.

In the Signature tab, choose Draw mode and sign directly on the canvas with your mouse, trackpad or a finger/stylus on touchscreens. If it doesn't come out right, tap Clear underneath the canvas to wipe it and try again — the tool automatically trims the transparent border around your ink so the signature drops onto the page at the right size.

Drag anywhere on a placed item to move it, or drag the small handle at its corner to resize it — text and date items automatically scale their font size as you resize. On a touchscreen you can also pinch with two fingers to resize and reposition in one gesture, and pressing Delete or Backspace removes whichever item is currently selected.

Yes. Use the Prev/Next arrows or the page thumbnail strip to jump between pages — each thumbnail shows a small badge with how many items you've already placed on it. The Placed signatures list in the Pages panel lets you tap any item to jump straight back to its page and select it, or delete it from there.

Once your PDF finishes rendering, a one-time popup asks for your full name (pre-filled if you're signed in) and, when you confirm, instantly builds a typed cursive signature from it and switches you to the Signature tool so you can tap the page to place it immediately. Tap Skip if you'd rather draw your signature or upload an image instead.

Switch to the Stamp tab, then either use Create mode to type your company name and a short line of text like APPROVED, PAID or DRAFT and pick a color — the tool renders it as a circular stamp graphic on the spot — or switch to Upload mode to drop in an existing PNG or JPEG of your company's real rubber stamp. Once it's rendered or uploaded, tap Add to page (or tap anywhere on the document) to place it just like a signature.

Yes — the Text tab is separate from Signature, Date and Stamp and lets you type a full paragraph (for example a certification statement or a note to the recipient) into a textarea. You can pick one of four fonts (Sans, Serif, Mono or Handwritten), set a color with the color picker, adjust size with the 1-6% slider, and toggle Bold or Italic before placing it on the page.