Most free PDF websites work the same way: you upload your document, their server processes it, and you download the result. That is convenient for the operator but means a copy of your file sits, at least for a while, on a computer you know nothing about. For an ID card, bank statement, payslip, medical report or exam form, that is a real risk.
What can go wrong with uploads
- Retention you cannot check. Many sites promise to delete files after an hour. You have to take that on trust.
- Breaches. Servers holding thousands of personal documents are attractive targets.
- Third parties. Some services pass files to other cloud providers or AI services to process them.
- Rules at work. Many employers do not allow client or staff documents to be uploaded to unapproved websites at all.
What “in your browser” means
A browser-based tool sends you the program instead of asking for your file. When you open a tool on PDF Karigar, the browser loads the code from our site, then reads your document with its own file picker. Merging, compressing, converting, signing and editing all happen with that code on your phone or computer, and the result is created there too. Your document never travels to our servers, and closing the tab discards the working copy.
Check any site yourself
- On a computer, open the tool page and press F12 (or right-click and choose Inspect) to open developer tools.
- Choose the Network tab and clear the list.
- Add a PDF and run the tool.
- Look at the requests. An uploading site sends a large request, about the size of your file, to its server. A browser-based tool loads code and fonts, but your document does not appear as an upload.
Also read the privacy policy. A site that processes files on a server should say where, for how long, and who else can access them.
Tools on this site that stay private
Every tool on PDF Karigar works this way, including the ones where privacy matters most:
- Merge PDF, Split PDF and Extract pages
- Compress PDF and size targets such as 100 KB
- PDF Editor, Sign PDF and Redact PDF
- Protect PDF and Unlock PDF
- PDF to Word, PDF to Excel and JPG to PDF
The PDF Editor may download font files from Google Fonts or jsDelivr when you choose a typeface. That is a download of a font to your device; your document is not sent.
Good habits with personal documents
- Photos sync. A photo of your ID taken with the phone camera may be copied to Google Photos or iCloud automatically. Scanning inside the browser with Scan to PDF avoids adding it to your photo library.
- Downloads stay behind. On a shared or office computer, finished files sit in the Downloads folder after you leave. Delete them when you are done.
- Private windows do not hide downloads. They forget your history, but files you save are still saved.
Honest limits
- Device power. Very large files, such as a 500-page scan, take longer on an older phone than on a laptop.
- No text recognition. Scanned pages are pictures, and the tools here do not read text out of pictures. Converters that need text, such as PDF to Word’s editable mode or PDF to Excel, tell you when a file is a scan.
- You still decide where the result goes. A private tool does not help if the finished file is then emailed unprotected. Use Protect PDF for sensitive documents.
Privacy is the main reason to prefer browser-based tools for personal documents, and there is rarely a downside in speed or quality.
Frequently asked questions
How can I tell if a PDF site uploads my file?
Open your browser’s developer tools, go to the Network tab, then run the tool. If the site uploads your document, you will see a request about the size of your file being sent to a server. With a browser-based tool, you will not.
Are browser-based tools slower?
Usually not. There is no upload or download wait, so small and medium files are often faster. Very large files depend on your device’s memory and speed.
Does PDF Karigar store any of my documents?
No. Documents are processed in your browser and are never sent to our servers. The site only remembers a few settings, such as light or dark mode, in your browser.