How to fill in a PDF form online and make a flat PDF fillable
Fill in PDF forms online for free, type on flat forms with no fields, and turn any flat PDF into a fillable form with Detect fields. Nothing is uploaded.
13 min readRead more →
🔒 Files never leave your device
Sign PDF — Add Your Signature Free
Draw, type or upload your signature, tap where it belongs on the page, add the date and download the signed PDF.
✍️
Drop a PDF to sign
or click to browse your files
Draw · Type · Upload·No upload·No signup
Opening PDF…
📄 ·
1 Create your signature
Ink
Sign above the line with your mouse, finger or stylus
Styles use handwriting fonts already on your device, so they can look different on another phone or computer. What you pick here is exactly what goes into the PDF.
Tip: sign on plain white paper with a dark pen and photograph it in even light.
Your signatures — tap one to choose it for the next placement:
2 Place it on the page
Start with step 1: create your signature, then tap the page where it should go.
Page of 1
Loading page…
Tap the page to place · drag to move · drag the blue dot or use Size to resize · ✕ to remove
3 Review & download
ℹ️ Visual electronic signature: this tool places an image of your signature on the page. It is not a certificate-based digital signature, so it carries no cryptographic proof of who signed or whether the file changed afterwards. Check whether a qualified or certified signature is legally required for your document before relying on it.
How can I sign a PDF online for free without uploading it?
Open the PDFChai Sign PDF tool and add your PDF. Create a signature by drawing it with your mouse or finger, typing your name in a handwriting style, or uploading a photo of your signature, then tap Use this signature. Tap the page where it belongs, drag and resize it, place the date if needed, repeat on any other pages, and click Download Signed PDF. Everything runs in your browser, so the document is never uploaded and no signup is needed. The result is a visual electronic signature, not a certificate-based digital signature.
PDFChai Sign PDF vs Other Online Signing Tools
| Feature | PDFChai | Typical Online Tools |
|---|---|---|
| Price | Free, sign as many PDFs as you like | A few free documents per month, then paid |
| Privacy | Signed in your browser — PDF never uploaded | PDF uploaded to and often stored on their servers |
| Signup | None | Account usually required |
| Ways to sign | Draw, type or upload an image | Similar options, sometimes limited on free plans |
| Multiple pages | Signatures, initials and dates on any number of pages | Supported, sometimes with field limits |
| Signature type | Visual electronic signature (image on the page) | From visual signatures up to certificate-based signing with audit trails |
Comparison reflects common free online PDF signing tools as of 2026 & may vary by provider and plan. Services that route documents to several signers usually add audit trails, which this tool does not.
What is a Sign PDF Tool?
A Sign PDF tool lets you put your signature on a PDF without printing it, signing with a pen and scanning it back in. It is the quickest way to return a signed offer letter, rental agreement, consent form, invoice approval or school permission slip: you add your signature to the right line, save the file and send it straight back.
With PDFChai you can create a signature three ways. Draw it with a mouse, trackpad, stylus or finger; type your name and pick a handwriting-style font; or upload a photo or scan of your signature on paper, with an option to remove the white background. Then tap the exact spot on the page, drag the signature into place, resize it with a slider, and add today's date beside it. You can sign several pages, or copy your initials onto every page, before downloading.
The PDF is opened and signed entirely inside your browser with pdf.js and pdf-lib, so it is never uploaded. To be clear about what you get: this is a visual electronic signature, an image of your signature fixed onto the page. It is not a certificate-based digital signature with a cryptographic seal. Plenty of everyday paperwork only needs the visual kind, but if a law, court, bank or government office asks for a qualified or certificate-based signature, use a service that issues one.
⚡ Quick Answer:
- Open debugspot.com/sign-pdf and add your PDF
- Draw, type or upload your signature, then tap Use this signature
- Tap the page where it belongs, then drag and resize it
- Place the date, or more signatures on other pages, if needed
- Click Download Signed PDF
100% free · No signup · No watermark · Files stay on your device
Step-by-Step Guide
Everything you need to know — done in under a minute.
1
Open your PDF
Drop the PDF onto the box or click to choose it. The first page is shown at a readable size, with Prev and Next buttons and a page number box to move through the document. The file is read on your device and is not uploaded.
2
Create your signature
Use the Draw tab to sign with your finger or mouse (pick black or blue ink, undo a stroke or clear it for another try), the Type tab to turn your name into a script signature, or the Upload tab for a photo of your handwritten signature. Tap Use this signature when it looks right.
3
Place it on the page
Tap or click where the signature should go. Drag it to fine-tune the position, and use the Size slider or the blue corner dot to make it bigger or smaller. Switch to Place date to stamp the date next to it, move to other pages and repeat, or use Copy to all pages for initials.
4
Download the signed PDF
Check the list of placed items, remove any you do not want, then click Download Signed PDF. The file is saved as yourfile-signed-pdfchai.pdf with your signatures fixed onto the pages.
How Does It Work?
Understanding what happens behind the scenes helps you trust the tool — especially with confidential files.
🖊️ Smooth signature capture
The drawing pad listens to mouse, pen and touch input, smooths every stroke with curves and varies the line slightly with speed or pen pressure, so a finger signature looks natural rather than jagged.
🧼 Clean signature image
Your signature becomes a transparent PNG trimmed tightly to the ink. Uploaded photos can have their white paper background removed so only the ink sits on the document.
📏 Exact placement maths
Where you tap is converted from screen pixels into PDF points, taking the zoom level, page size, visible crop area and any page rotation into account, so the signature lands exactly where you saw it.
🔒 Signed on your device
pdf-lib embeds each signature image once (even if you use it on many pages) and writes the date as real text, then the new PDF downloads straight from your browser. Nothing is stored on a server.
Key Features & Advantages
✍️
Draw with mouse or finger
A responsive signing pad for mouse, trackpad, stylus and touchscreens, with undo, clear and ink colour options.
🔠
Type a script signature
Turn your typed name into a handwriting-style signature using script fonts already installed on your device.
📷
Upload a signature photo
Use a scan or photo of your real signature and remove the white background with one tick.
📍
Tap to place, drag to adjust
Place a signature anywhere on any page, move it precisely and resize it with a slider or handle.
📅
Add the date
Stamp today's date in the format you prefer, or edit the text, next to your signature.
📚
Sign many pages
Add signatures and initials across a long document, or copy one to every page in a single click.
Who Uses This Tool?
This is one of the most common document tasks in work, study and everyday life. Here are the people who use it every day.
🧑💼 Employees & job seekers
Sign offer letters, NDAs, onboarding forms and timesheets and send them back the same day, without hunting for a printer.
🏠 Tenants & landlords
Sign rental agreements, inventory checklists and renewal letters from home or on the move.
👨👩👧 Parents
Sign school permission slips, consent forms and activity sign-up sheets on a phone in a couple of minutes.
🧾 Freelancers & small businesses
Sign quotes, contracts, purchase orders and invoice approvals before emailing them to clients.
🏥 Patients & customers
Complete and sign registration or consent PDFs sent by clinics, gyms, schools and service providers.
🎓 Students
Sign declarations, internship agreements and application forms that ask for a signature and date.
Common Use Cases
The everyday situations that bring people to this tool.
📄 Returning a signed agreement
Someone emails a PDF for your signature: sign it, date it and reply with the signed copy in minutes.
🔤 Initialling every page
Some contracts ask for initials on each page. Create your initials, place them once and copy them to all pages.
✅ Approving documents
Sign off invoices, expense claims, timesheets or reports as approved without printing anything.
📱 Signing on the go
Sign with your finger on a phone while you are away from a desk, scanner or printer.
🖋️ Reusing your real signature
Upload a scan of your handwritten signature so digital documents carry the same signature you use on paper.
📬 Signature and date together
Place your signature on the signature line and the date on the date line in one session.
How to Use It on Any Device
Works on every platform, right in the browser. Here are instructions for the most common devices.
🪟 How to sign a PDF on Windows
Open Chrome, Edge or Firefox, go to debugspot.com/sign-pdf, add the PDF and draw your signature with the mouse, a touchpad, or a pen on a touchscreen laptop.
Works on: Windows 10, 11 · Chrome, Edge, Firefox
🍎 How to sign a PDF on Mac
Open Safari or Chrome, add your PDF and sign with the trackpad, or type your name and choose a script style. The signed file opens in Preview or any PDF reader.
Works on: All recent macOS versions · Safari, Chrome, Firefox
🤖 How to sign a PDF on Android
Open Chrome, pick the PDF from Files, Downloads or Drive, sign with your finger on the pad and tap the page to place it.
Works on: Android 8+ · Chrome, Samsung Internet
📱 How to sign a PDF on iPhone / iPad
Open Safari, choose the PDF from the Files app, sign with your finger or Apple Pencil and save the signed copy back to Files.
Works on: iOS / iPadOS 15+ · Safari, Chrome
💻 How to sign a PDF on Chromebook
Open Chrome, add the PDF from Downloads or Google Drive and sign with the touchpad or touchscreen, with no extension needed.
Works on: All Chromebooks · Chrome
Tips & Best Practices
✅ Zoom in for precise placement
On a phone, set Zoom to 150% or 200% before placing so the signature sits exactly on the line.
✅ Sign big, then shrink
Draw your signature large across the pad. It is trimmed and scaled down on the page, which keeps the strokes smooth.
✅ Photograph signatures in good light
For uploads, sign on plain white paper with a dark pen and take the photo in even light so the background removal works cleanly.
✅ Check whether a certified signature is needed
Some documents, such as certain government, court, banking or notarised filings, require a qualified or certificate-based digital signature. If unsure, ask the recipient before relying on a visual signature.
✅ Fill in text fields first
If the form also needs typed details, add them with the PDF Editor first, then come back here to sign.
✅ Keep the unsigned original
The tool saves a new signed copy and leaves your original untouched, so you can sign again if anything needs to change.
Full List of Benefits
✓Draw, type or upload your signature
✓Works with mouse, trackpad, stylus and touch
✓Smooth strokes with undo, clear and ink colours
✓Optional white-background removal for uploads
✓Tap to place on any page, drag to move
✓Resize with a slider or corner handle
✓Add today's date in several formats
✓Copy initials to every page in one click
✓Accurate placement on rotated and cropped pages
✓Signature embedded once, so files stay small
✓Runs entirely in your browser — nothing is uploaded
✓Free, with no signup and no added branding
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Frequently Asked Questions
Is it free to sign a PDF here?
Yes. You can sign as many PDFs as you like with no signup, and nothing is added to your document except what you place on it.
Is my document uploaded?
No. The PDF is opened, signed and saved inside your browser. It never reaches a server, so it stays private.
Is this signature legally binding?
It creates a visual electronic signature. In many places a simple electronic signature can be used for everyday agreements, but the rules differ by country and by type of document, and some require a certificate-based or qualified signature or a signature on paper. If in doubt, check with the recipient or a legal adviser.
What is the difference between an electronic and a digital signature?
An electronic signature is any electronic mark of agreement, such as an image of your handwritten signature. A digital signature uses a certificate and cryptography to prove who signed and that the file has not changed since. This tool adds the first kind.
Can I sign with my finger on a phone?
Yes. The drawing pad supports touch, so you can sign with a finger or stylus on Android phones, iPhones and tablets.
Can I use a picture of my real signature?
Yes. Open the Upload tab, choose a PNG or JPG of your signature and keep Remove white background ticked so only the ink is placed.
Can I sign more than one page?
Yes. Move between pages with Prev and Next and tap to place a signature on each, or select one and use Copy to all pages.
How do I remove a signature I placed by mistake?
Tap the red ✕ on the selected signature, press Delete on a keyboard, or use Remove in the list under the page.
Can other people sign the same PDF?
Yes. Download the signed file and send it to the next person, who can add their own signature here. There is no automatic signing workflow or audit trail.
Why does my typed signature look different on another device?
Typed styles use handwriting fonts installed on your device, and those vary between Windows, Mac, Android and iOS. Whatever you see in the preview is exactly what is placed in the PDF.
Will signing break an existing digital signature?
Yes. If the PDF already carries a certificate-based digital signature, adding anything afterwards invalidates it. Ask the sender for an unsigned copy, or sign in the software they specify.
Can I sign a password-protected PDF?
An encrypted PDF has to be unlocked first. Use Unlock PDF with the password, then sign the unlocked copy here.
Guides and tips
How to edit a PDF online for free (the easy way)
Edit a PDF online for free. Change existing text, add new text, highlight, draw, sign, insert images and fix pages in your browser. Nothing is uploaded.
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