Guides and common uses
Practical guides to redacting documents so nothing is left underneath, and to doing it without uploading them anywhere.
Start here
- How to redact a PDF properly
Black boxes in Word or a PDF editor often leave the text underneath, ready to copy. How to redact a PDF properly, and a 10-second check for any file.
Common uses
- Redact a PDF without uploading it
Black out names, IBANs and ID numbers in a PDF entirely in your browser. Your file never leaves your device. Free up to 10 pages.
- Black out text in a PDF so it can't be copied
A black box in an editor often leaves the text underneath. Sumi redraws each page as an image so redacted text is gone for good. Runs in your browser.
- Redact a bank statement
Hide account numbers, card numbers and transactions on a bank statement, in your browser. Sumi checks IBANs and card numbers before flagging them.
- Redact a scanned document or photo
Sumi reads scans and photos on your device in 30 languages, finds personal data, and blacks it out. No upload, no account. Free up to 10 pages.
- Redact handwriting and signatures
Sumi finds handwritten notes, signatures and stamps that text recognition can't read, and boxes them for you to black out. All on your device.
- Redact a payslip
Hide your social security or NI number, IBAN and address on a payslip, directly in your browser. Free for documents up to 10 pages.
- Hide an IBAN in a PDF
Hide an IBAN or a card number in a PDF directly in your browser. Sumi checks the IBAN checksum before flagging it, so the list stays short.
- Redact an ID card or passport
Hide the document number, date of birth or address on a photo of your ID, in your browser. The photo never leaves your device.
- GDPR access request: redact other people's data
Before you answer a data subject access request, hide other people's personal data in your documents, without uploading them anywhere.
- Redact court and tribunal exhibits
Hide third-party data in your exhibits before you file them: names, addresses, IBANs. The redaction is real, nothing is left under the black.