Browser Mode: Private PDF Tools That Never Upload Your Files (2026)
Every online PDF tool asks you to do the same uncomfortable thing: hand over your file. Contracts, payslips, medical records, ID scans. You upload them to a stranger's server, trust a privacy policy you never read, and hope the delete-after-processing promise is real.
Browser mode removes the trust question entirely. Flip one switch on iHatePDF and 22 tools stop using our servers altogether. The engines run inside your browser, on your device, and a technical guard blocks any file from being sent out. You do not have to believe us. You can open your browser's network inspector and watch nothing leave.
- Open ihatepdf.com and click the small incognito icon in the top bar, next to the theme switch.
- The icon turns green and a message confirms: Browser mode activated.
- Use any of the 22 supported tools normally. Your files are processed on your device and never uploaded.
- Click the icon again to return to normal Server mode at any time.
What Browser mode actually does
Normally, online PDF sites work like a courier service: your file travels to a server, gets processed there, and travels back. iHatePDF in Server mode works that way too, with files deleted within an hour. Browser mode replaces the courier with a local workshop. The tool's engine is downloaded once as a small program, runs inside the browser sandbox on your own processor, and writes the result directly to your downloads folder.
The switch also arms a strict guard: while Browser mode is on, any request that would carry a file to our servers is blocked in the browser itself before it can start. Tools that genuinely need a server, such as Word to PDF conversion, say so openly and wait until you switch back. There is no silent fallback and no fine print.
All 22 tools that run on your device
- Organize: Merge PDF, Split PDF, Rotate, Delete Pages, Organize, Crop, Page Numbers
- Compress: Compress PDF with the real Ghostscript engine, plus Compress Image
- Security: Protect PDF with 256-bit AES encryption and Unlock PDF, both running the same qpdf engine our servers use
- Convert: PDF to Word, PDF to JPG, JPG to PDF, Convert to JPG
- Watermark: Watermark PDF and Watermark Image
- AI on your device: Remove Background runs its neural network locally, and OCR reads scans with on-device text recognition
- Create and edit: the Editly PDF editor, the document scanner and the QR code generator
The same engines, compiled for your browser
Most sites that advertise local processing quietly ship weaker replacements. We took a different route with WebAssembly, a technology that lets full desktop-grade software run safely inside a web page. Compress PDF in Browser mode is the actual Ghostscript engine, the same software our servers run, producing the same file sizes. Protect and Unlock use the real qpdf encryption library. PDF to Word is built on MuPDF, the engine family behind professional PDF software, and rebuilds your document with exact page geometry, fonts, colors, images and even table layouts.
The result: a 4 MB photo-heavy PDF compresses to a few hundred kilobytes without a single byte reaching the internet. A confidential contract gets password protection with 256-bit AES while your connection stays silent. That is not a marketing claim, it is observable behavior.
It also works with no internet at all
Because the engines live on your device, they do not care whether you are online. Install iHatePDF as an app: open the toolbox, choose Install as PWA, and confirm. After that, the browser tools load and run in airplane mode, on trains, or on hotel Wi-Fi that died an hour ago. Merge a stack of PDFs at 11,000 meters and the plane's missing internet is not your problem.
How to turn it on in 3 steps
Step 1. Click the incognito icon
It sits in the top bar of every page, right next to the light and dark theme switch: a small hat with glasses. One click and it turns green, with a short confirmation that Browser mode is active. Your choice is remembered for every future visit.
Step 2. Use the tools normally
Nothing about the interface changes. Drop your file into Compress, pick a level, download the result. The only difference is a small green note telling you the tool is running entirely on your device. Tools that need the server show a clear notice instead, with a one-tap way back to Server mode.
Step 3. Switch back whenever you want
Server mode remains the default for a reason: it handles very large files, complex Word conversions and Office formats better. Click the green icon and you are back to full power. Many people keep Server mode for everyday work and flip to Browser mode for anything sensitive.
When Server mode is still the better choice
Honesty matters more than a feature list. Converting Word, Excel or PowerPoint files to PDF needs a full office suite, which no browser can carry. PDF to Word with heavy multi-column layouts and footnotes is stronger on the server, where our layout engine checks its own output for accuracy. Files near the 80 MB limit process faster on server hardware than on an older phone. In all of these cases the site tells you directly and the choice stays yours, which is exactly how it should be.
Frequently asked questions
Do my files really never leave my computer?
Correct. In Browser mode a technical guard blocks every file request to our servers before it can start, so an upload is not just avoided, it is impossible. The processing happens in your browser's own memory and the result is saved straight to your device.
Which tools work in Browser mode?
22 tools: Merge, Split, Compress PDF, Rotate, Delete Pages, Organize, Crop, Page Numbers, Watermark PDF, Watermark Image, Protect PDF, Unlock PDF, PDF to Word, PDF to JPG, JPG to PDF, Convert to JPG, Compress Image, Remove Background, OCR, QR Codes, the Editly editor and the document scanner.
Is the quality the same as normal Server mode?
For most tools it is identical, because the same engines run in your browser: Compress uses real Ghostscript and Protect and Unlock use real qpdf, both compiled to WebAssembly. A few tools are stronger on the server, for example PDF to Word with very complex layouts, and the site tells you exactly when that is the case.
Does Browser mode work offline?
Yes. Install iHatePDF as an app from the toolbox and the browser tools keep working with no internet at all: on a plane, in a dead zone, anywhere. Pages and engines are stored on your device after your first visit.
Is Browser mode free?
Yes, completely. Every tool in Browser mode is free with no signup, no watermark and no page limits beyond your device's own memory. Processing happens on your hardware, so there is nothing for us to meter.
How can I verify that nothing is uploaded?
Open your browser's developer tools, go to the Network tab, and run any Browser mode tool. You will see zero requests carrying your file. That is the entire point: you do not have to trust us, you can watch it.
Does it work on phones and tablets?
Yes. Browser mode runs in any modern browser on iPhone, Android, tablets and desktops. Very large files benefit from a device with more memory, and the site will suggest Server mode when a file is too heavy for your hardware.