Yes. When you select a file, the browser's JavaScript reads it locally using the FileReader API. The file content is never uploaded anywhere — it stays in your device's memory until you download the result.

Our goal is to provide a utility, not a data-collection platform. Accounts exist to track users — we have no interest in that. Open any tool and start working immediately.

How does browser-based PDF processing work?

We use WebAssembly (WASM) to run PDF engines directly in your browser — the same technology behind professional desktop software. Your CPU does the work locally; our servers are never involved.

Does it work offline?

Yes. Once the page loads, you can disconnect from the internet and continue processing PDFs. No server connection is needed for any tool operation.

Free · Private · Client-side

Private PDF Tools That Never Leave Your Browser.

Free, serverless PDF utilities with zero tracking, no logins, and 100% client-side processing. Your data stays on your device. 118+ tools by Dev Byte.

118+ PDF tools
0 server uploads
No login

Browse all tools

0Server uploads

100%Client-side

118+PDF tools

∞Always free

01 — Privacy

Your file never leaves your device

Three steps. Zero server contact. Close the tab and nothing remains.

No upload
Pick a file
Select from your device — nothing is uploaded
No server
Browser processes
JavaScript and WebAssembly run locally on your CPU
No storage
Download result
Save instantly — we never store your document

02 — Tools

Popular tools

Jump in — your files stay local from the first click

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03 — Audiences

Trusted where privacy matters

Professionals who cannot risk uploading documents to the cloud.

04 — Compare

How browser-based PDF tools compare

Most PDF sites upload your files to a remote server. DevByte never does.

Cloud PDF sites

Upload → server → download. Your files pass through someone else's infrastructure.

File uploaded? — Yes
Server needed? — Yes
Free? — Limited
Works offline? — No
Account needed? — Often

Dev Byte PDF

Open → process locally → save. Your files stay on your device the entire time.

File uploaded? — Never
Server needed? — No
Free? — Always
Works offline? — Yes
Account needed? — No

05 — Features

Powerful PDF Tools, Zero Compromise

Every tool runs locally in your browser — fast, free, and private by design.

06 — Trust

Built for trust, verified by design

Technical trust signals you can verify — no testimonials required.

No data collection
100% private
No account required

Privacy Manifesto View on GitHub Security Privacy Policy

07 — FAQ

Still not sure?

We hear these questions every day from people leaving cloud PDF tools.

Because your files are processed entirely in your browser, we have no server costs for PDF processing. No cloud infrastructure means we can offer every tool for free — with no file limits, watermarks, or paywalls.

All PDF tools

118 free, private, browser-based utilities — merge, convert, compress, sign, and more.

Browse all tools Try merge PDF