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CanaryPDF

Fill and Sign PDF Online — Free, Private, No Upload

Fill and sign PDF documents directly in your browser — no account, no waiting. This free PDF form filler works with any PDF, whether it has interactive form fields or not. Fill in text fields, mark checkboxes, select from dropdown menus and add one or more signatures anywhere on the page. All processing happens locally in your browser, so your file never leaves your device.

When you are finished, save the filled PDF in two ways: flatten the form to lock in your entries and create a clean, final document, or keep the fields editable so you or others can continue filling it later. The fill and sign PDF tool handles standard AcroForm fields automatically — fields are detected on load so you can tap or click straight into them. For PDFs with no form fields at all, simply add your signature and save. No software to install, no sign-up required.

The tool auto-detects standard AcroForm fields as soon as your PDF loads. Text fields, checkboxes and dropdown menus are highlighted so you can tap or click straight into them. For PDFs that have no interactive form fields at all, you can still add signatures and save the result. XFA forms (an advanced format used in some government and enterprise PDFs) cannot have their fields filled in the browser, but you can add signatures to those documents as well.

To sign a document, tap or click Add Signature and draw your signature with a mouse, trackpad or finger. You can also select a signature image from your device. Once created, tap or click anywhere on a page to place the signature, then drag to reposition it and drag a corner to resize it. You can place multiple signatures on different pages of the same document — useful for contracts and multi-page agreements that require initials on every page.

Common use cases include signing rental agreements and lease forms, completing tax documents, filling out job applications and onboarding paperwork, signing NDAs and vendor contracts and submitting insurance or medical consent forms. Teachers and administrators fill out student evaluation forms. Small-business owners sign purchase orders and invoices. Legal professionals prepare execution copies of agreements. Because the tool runs entirely in your browser, it is safe to use with documents that contain personal, financial or legally sensitive information.

The traditional alternative — printing a PDF, signing by hand, scanning it back in — wastes time and degrades quality. Desktop signing tools like Adobe Acrobat require a paid subscription. Many online services upload your file to a remote server, introducing privacy risk for sensitive documents. CanaryPDF handles the entire workflow in your browser: no upload, no account, no subscription. The result is a fast, private way to fill and sign PDFs that works on any device with a modern browser.

How to Fill and Sign a PDF

  1. Open your PDF — Go to the Fill and Sign tool and select the PDF file from your device. The tool loads the document and automatically detects any form fields.
  2. Fill in the form fields — Tap or click a text field to type into it, check checkboxes and choose from dropdown menus. Fields are highlighted so you can see what is available to fill.
  3. Add your signature — Tap or click Add Signature, then draw your signature or select an image of it. Tap or click on the page to place the signature where you need it.
  4. Save your filled PDF — Tap or click Save PDF and choose whether to flatten the form to lock in your entries or keep the fields editable. Your completed document is saved to your device.

Frequently asked questions

How do I fill and sign a PDF online?
Open the Fill and Sign tool, select your PDF, and the tool detects any form fields automatically. Tap or click a field to fill it, mark checkboxes or choose from dropdowns. To add a signature, tap or click Add Signature, draw or select your signature, then tap or click on the page to place it. When you are done, tap or click Save PDF to save your completed document.
Can I sign a PDF that has no form fields?
Yes. The tool works on any PDF, even ones with no fillable form fields. Just open your PDF, tap or click Add Signature, create your signature by drawing or selecting an image and place it anywhere on the document. You can add multiple signatures if needed.
Is my PDF uploaded to a server when I fill and sign it?
No. Your file never leaves your device. All processing runs locally in your browser. CanaryPDF has no server that receives or stores your documents, which makes it safe to use with sensitive or confidential files.
What types of form fields does it support?
The tool supports standard AcroForm fields: text fields, checkboxes, dropdown menus and signature fields. Fields are detected automatically when you open the PDF. Note that XFA-format forms (an advanced Adobe format used in some government and enterprise PDFs) are not supported for field filling, though you can still add a signature to those files.
Can I save the filled PDF and keep the fields editable?
Yes. When you tap or click Save PDF, you can choose to keep the fields editable so the document can be updated later. Alternatively, you can flatten the form, which locks the filled values into the page and prevents further editing — this is recommended when sending a completed form to someone else.
Can I fill a PDF form without Adobe Acrobat?
Yes. CanaryPDF's Fill and Sign tool works entirely in your browser with no software to install and no account required. Open your PDF, fill in text fields, mark checkboxes and select from dropdowns just as you would in Acrobat. You can also add a drawn signature or select an image of one and place it anywhere on the page. When you are done, save the filled PDF to your device. The tool is completely free, works on all modern browsers and your file is never sent to a server.
How do I add a signature to a PDF for free?
Open the Fill and Sign tool and select your PDF. Tap or click Add Signature and either draw your signature using your mouse or finger, or select an image of your signature. Once created, tap or click anywhere on the PDF page to place it. You can resize and reposition the signature before saving. When you are done, tap or click Save PDF to save the signed document. The tool is free, requires no account and your file never leaves your device.