How to Fill PDF forms online without uploading
🔒 Processed on your device — nothing uploaded
Need to fill pdf forms without handing your files to a website? This guide shows you the private way — everything runs in your browser, so your document never leaves your device.
It is free, needs no signup, adds no watermark and even works offline.
Open the Fill PDF forms tool →
How to fill pdf forms — step by step
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Add your file
Drag your file into the box or click to browse. It is read by your browser only — nothing is uploaded.
Step 1: Add your file -
Choose options
Pick the settings you need for Fill PDF forms. Everything updates instantly on your device.
Step 2: Choose options -
Run the tool
Press the action button. The work happens locally using open-source libraries — even offline.
Step 3: Run the tool -
Download the result
Save the finished PDF to your device. Multiple files download as a ZIP.
Step 4: Download the result
Why use2pdf is different
- Private — your file is read by your browser and never uploaded to a server.
- Unlimited — no file-size cap beyond your own device memory.
- Free — no signup, no watermark, no paywall.
- Offline — install it once and it works with no internet.
Tips & common mistakes
- Keep the original file until you have checked the result.
- For very large files, let the background worker finish before closing the tab.
- Install use2pdf as an app to run fill pdf forms offline anytime.
Frequently asked questions
Are my files uploaded to a server?
No. Your file is read by your browser with FileReader and processed locally by pdf-lib. It never leaves your device and nothing is stored on any server.
Is there a file size limit?
There is no fixed limit. Processing happens on your device, so the only ceiling is your device's available memory. Very large files use a background worker to keep the page responsive.
Do I need to sign up or pay?
No. Fill PDF forms is completely free with no signup, no watermark and no paywall. Download the result as many times as you like.
Does it work on mobile?
Yes. The tool is mobile-first and runs in any modern mobile browser. You can also install use2pdf as an app and use it offline.
Does it work offline?
Yes. Once the page has loaded, the tool is cached by the service worker, so Fill PDF forms keeps working with no internet connection.