在线 PDF 签名 - 免费在浏览器中为 PDF 添加签名

上传 PDF，输入一个样式化签名、用鼠标或手指手绘签名，或上传扫描签名的透明 PNG。将其拖到签名字段上，在页边添加姓名缩写，然后下载一份在任何阅读器中都能正常打开的已签名 PDF。

在大多数司法管辖区是的——美国《ESIGN 法案》、欧盟《eIDAS 条例》、英国《电子通信法》和印度《信息技术法》都承认简单电子签名可用于日常合同（录用通知、保密协议、自由职业协议、发票）。但高价值交易可能需要合格电子签名。

可以。为每一方添加签名字段，保存已部分签署的 PDF，将其发送给下一位签署人，让他们在指定位置添加签名。审计记录（谁在何时签署）会嵌入到 PDF 元数据中。

从工具栏拖放签名、姓名缩写和日期戳到任意页面。日期戳默认使用今天的日期，但可以手动更改。下载时将 PDF 扁平化，使收件人无法改动签名的位置。

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.

可以。开启「下载时合并并锁定」后，签名、缩写签名和日期戳都会固化到页面中。再配合可选的密码保护步骤，文档便具备了防篡改特性。

此工具添加的是电子签名 — 即把你手写、输入或上传的签名作为可见图像加盖到页面上 — 对于保密协议、报价单、发票等日常协议具有法律效力。它不会生成基于证书的数字签名（即 Acrobat 通过 .p12 / PKI 证书验证的那种加密签名）。对于常规文档，电子签名就够用了；对于必须能加密验证防篡改的文件，请使用基于证书的签名服务。

此工具专注于在页面任意位置放置签名、姓名缩写、日期和印章。如果你的 PDF 含有需填写的交互式表单字段 — 复选框、文本输入框、下拉框 — 请先用我们的「填写 PDF 表单」工具填写它们，再回到这里添加签名。

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.