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How to verify a PDF tool really works locally — a 2-minute test

Any site can claim "we don't store your files". Here is a two-minute test with browser DevTools — plus an airplane-mode check — that proves whether a PDF tool uploads your file or processes it locally.

Claims are free; the network tab is evidence

"Secure", "private", "files deleted after one hour" — every PDF site says something like this. None of it tells you the one thing that matters: does your file leave your device? The browser’s DevTools Network tab answers that question definitively, no expertise required.

In our own recorded walkthroughs, the five biggest PDF sites all uploaded files to their servers during processing. That is a legitimate architecture — but you should be able to see it, not take it on faith. The same test proves Paplume’s local tools do not upload.

The airplane-mode test

An even simpler check: load the tool page, then turn off Wi-Fi (or enable airplane mode) and process the file. A server-based tool fails immediately — it cannot upload. A genuinely local tool keeps working, because everything it needs is already in your browser.

One honest nuance: the page itself must load first (and OCR language packs download on first use), so "local" means local processing after load, not a fully offline website.

Step by step

  1. 1

    Open DevTools → Network

    Press F12 (or right-click → Inspect), switch to the Network tab, and clear it.

  2. 2

    Process a test file

    Use a harmless PDF first. Watch the request list as processing runs.

  3. 3

    Read the evidence

    A megabytes-sized POST/PUT request = your file was uploaded. Only small telemetry/quota pings = processing is local.

  4. 4

    Confirm with airplane mode

    Load the tool, cut the connection, process again. Local tools keep working after the page is loaded.

Try it on our merge tool →

FAQ

What requests does Paplume send during local processing?

Small quota and anonymous counter pings (documented in the privacy policy) — never the file. You will see their sizes in the Network tab: bytes, not megabytes.

Does this test work on any website?

Yes — the Network tab shows every request any site makes. It is the same tool web developers use daily.

Are Paplume AI tools local?

No — AI translate/summarize/chat send extracted text to an AI service and disclose it on the page. The airplane-mode test will show exactly that: local tools keep working, AI tools do not.