Local PDF tool - browser processing

Split a PDF without uploading

Splitting a PDF without uploading means dividing one PDF into several files in your browser, with nothing sent to a server. You mark cuts on the preview or type page ranges, then export the outputs individually or as a ZIP — all built on your device.

Split locally See the proof

0 bytes sent proof

What the widget measures

The panel counts what leaves your browser after you choose a file. The site's own scripts and fonts load like any web page — what you will never see is a request carrying your PDF. Check it here, or open your browser's Network tab and see for yourself.

0 bytes of your document sentStarts measuring when you choose a file on a tool page

Document request bodies: 0 bytes
App network after file open: 0 bytes
Processing engine: Browser WASM worker

The number is scoped to request bodies after you choose a document. App assets such as JavaScript, WASM, and fonts can still load; those are not your PDF bytes.

Verify it yourself

Open DevTools, then the Network tab.
Choose a PDF in the tool and complete the action.
Filter for fetch or XHR requests; document processing should not create a request carrying your file.

Stronger check: load the tool page first, then disconnect from the network before choosing the file. Already-loaded tool code can continue processing locally, but a first visit still needs the site assets.

Local vs. online

How local processing compares

Doing this in Lemmafour keeps the file on your device. A typical online PDF tool uploads it to a server first — here is the practical difference:

	Typical online PDF tool	Lemmafour
Where your file goes	Uploaded to the provider’s servers	Stays in your browser — never uploaded
Works offline	No — it needs a round trip to their server	Yes, once the page has loaded
Account or sign-up	Often required	Never — no account, no email
What they keep afterwards	Your file sits on their servers until they delete it	Nothing to keep — it never left your device

Steps

How to do it in Lemmafour

Choose Split locally.
Open one PDF from this device.
Click scissor lines between pages or type one output range per line.
Review the current output plan and output prefix.
Choose Split, then download individual PDFs or the ZIP.

Expert note

Splitting does not redact

Splitting removes whole pages from an output, not content inside a page. If a page contains sensitive data beside content you need, split first to reduce the document and then redact the remaining page-level content before sharing.

FAQ

Questions people ask before using this tool

Can I split into one file per page?

Yes. Use Every page mode.

Can I type custom ranges?

Yes. Use one output range per line, such as 1-3 and 8-10.

Can I download all outputs together?

Yes. The split result includes a ZIP download when outputs are ready.

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