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Local PDF tool - browser processing

Redact a payslip before sharing

Redacting a payslip means permanently removing salary, tax, employee, and banking details before you share it — done locally in your browser. You drag over the details a landlord or recruiter does not need, apply secure redaction, and export, while the payslip stays on your device.

Redact the payslip 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
  1. Open DevTools, then the Network tab.
  2. Choose a PDF in the tool and complete the action.
  3. 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

  1. Choose Redact the payslip locally.
  2. Open the payslip PDF.
  3. Select Secure redaction in Redact mode.
  4. Drag over salary details, employee IDs, tax IDs, bank account fragments, addresses, and barcodes that are not needed.
  5. Apply redaction, confirm verification, export, and reopen the PDF before sharing.

Expert note

Payslip-specific hidden data

Payslips often include repeated IDs in headers, footers, QR codes, barcodes, metadata, and tiny text near payment tables. Redact all occurrences, not just the obvious net-pay line. If a barcode or QR code contains sensitive data, treat it as sensitive even when the printed numbers are removed.

FAQ

Questions people ask before using this tool

Should I redact the employer name?

Only if the recipient does not need it. Keep enough information to satisfy the request without exposing unnecessary data.

Can hidden metadata remain?

PDF metadata can exist separately from visible page text. Use sanitize options when appropriate and inspect the export.

Is drawing a black box enough?

No. Use Secure redaction for sensitive payslip data, not visual whiteout.

Related private PDF workflows

Keep working locally

Redact a PDF without uploading Use secure redaction mode locally in your browser and verify that redacted text is not recoverable. Redact a bank statement PDF privately Remove account numbers, transactions, addresses, and balances from a bank statement PDF locally. Split a bank statement PDF without it leaving your device Split a bank statement PDF into selected page ranges locally before sharing only the pages needed. Compress a PDF locally Reduce PDF file size right in your browser — the file never goes to a server to be compressed. PDF tool hub Browse the shipped local PDF tools.