Redact an ABA Routing Number from Check and ACH PDFs

Bank routing numbers and account numbers appear on a wide range of PDF documents — personal checks scanned to PDF, bank statements, wire transfer instruction forms, direct deposit setup letters, voided check images embedded in documents, and ACH authorization forms. When you need to share any of these documents — for a landlord application, a vendor payment setup, an HR direct deposit form, or a legal proceeding — you should permanently redact the routing and account numbers from any copy that will be stored, forwarded, or accessed by more people than absolutely necessary. HidePDF makes that fast and permanent.

The risk isn't just theft — it's exposure scope. A PDF submitted to an HR portal, a landlord's email inbox, or a property management company's file system may be accessed by multiple employees, stored in cloud systems with imperfect security controls, and retained for years. Every person and system that touches a document containing your full routing and account numbers is a potential exposure point. By redacting those numbers before submission and providing them through a separate, direct channel when actually needed, you dramatically reduce your financial exposure without impeding the legitimate purpose of the document.

How HidePDF works

ABA routing vs the full account string — why this page exists

A routing number is nine digits. It is not your account. Sibling page redact bank account number PDF covers the customer account, IBAN blocks, SWIFT/BIC, and payment QR codes. Stay here when the job is the ABA: ACH origination, voided-check MICR, statement headers that reprint the bank identifier on every sheet, and people who asked for a “voided check” when they only needed proof a relationship exists.

NACHA rules treat routing-plus-account as the credential that moves money. A landlord, HOA, or gig platform that stores a check photo is storing an ACH key. Cover the nine digits (and the account if they are not originating). Leave the printed name and bank logo when that is the proof they asked for.

Which PDF documents reprint the nine-digit ABA

Scanned personal checks are the most common source. When you scan a voided check to PDF for direct deposit setup, the resulting file contains your full routing number and account number in MICR font at the bottom, plus your name and address. That single PDF, if stored or shared without redaction, is a complete package of everything needed to initiate unauthorized ACH transactions from your account. Before emailing or uploading any scanned check PDF, take sixty seconds to redact those numbers in HidePDF.

Bank statements are the second most common scenario. Monthly or quarterly bank statements downloaded as PDF from your online banking portal contain your routing number and full account number, usually in the header of every page. When these statements are submitted as proof of funds for real estate transactions, visa applications, landlord requirements, or loan underwriting, the entire statement — all pages, all account details — often gets uploaded to a system with many users. Redacting the routing and account numbers from a statement copy before submission is a straightforward precaution that doesn't affect the document's usefulness as proof of your financial standing. See also redact bank statement PDF.

Wire transfer instruction PDFs are a third high-risk document type. If you've ever set up incoming wire transfers, you've likely received or created a PDF that spells out your bank name, routing number, account number, and sometimes your SWIFT or IBAN code. These documents get shared with clients, employers, and vendors — often repeatedly, over years, to multiple contacts at each organization. HidePDF lets you create a redacted version for general distribution while retaining the full version for situations where you're sharing with a single, vetted recipient who actually needs all the details. For account-number-specific workflows, use redact bank account number PDF.

Where ABA digits hide besides the MICR line

A routing number is nine digits, but it is not only the MICR strip on a voided check. Direct-deposit forms print it in a boxed field and again in a footer. Bank letters print it next to the account. Statement PDFs show it in every header. People black out the MICR line and leave the typed pair in the memo area. Recipients who only needed proof of a bank relationship then hold routing plus account plus a name.

HidePDF burns those digit groups on this device. Leave the bank name and last four if payroll instructions say that is enough. Cover the ABA everywhere it repeats. Do not send a voided-check photo that also shows a driver’s license.

Covering routing-plus-account pairs before a landlord or payroll share

Copy the check image or the form. Open it in the blackout tool on this page. Zoom until the MICR digits separate from the typed account line. Cover routing and account together when the recipient does not originate ACH. If they do originate ACH, follow their written list and still cover SSN, license, and unrelated joint owners.

1. On statements, page every sheet; the ABA reprints in headers that the first-page logo hides at thumbnail size.
2. On voided-check scans, cover the MICR line and the typed fraction in the upper right, which is the same routing number in another costume.
3. Export and search the nine digits with and without spaces, and the account string. If either pastes, widen the box.

Who actually needs a voided-check image

A landlord asks for a voided check as “proof of account” for a deposit refund later. The landlord is not originating payroll. The tenant covers routing and account, leaves the bank name and the printed name, and sends a file that proves a relationship without handing over an ACH key. If the landlord insists on digits, use the bank’s documented verification method, not a group-texted check photo.

A gig platform’s onboarding PDF is a photo of a check on a kitchen table next to mail. The mail shows a full name and a medical bill. The worker covers the MICR, the medical bill, and any SSN on the mail, leaves the platform’s form fields if those are separate pages, or recaptures the photo. Platforms store onboarding images. Table clutter becomes a record.

A parent setting up a 529 contribution asks the adult child for “a voided check PDF.” The parent needed to originate a gift ACH and may truly need the ABA. Even then, the child covers a joint-owner sibling’s name on the check if that sibling is not part of the gift, and covers the account if the parent already has a bank-link through a different official flow. Mark what the parent does not need to store in email.

Routing-cover mistakes that leave the number in a footer or endorsement

The endorsement image on the back of a scanned check can repeat the account. Mobile-deposit PDFs include both sides. People mark the front and email a two-page file.

Blacking the MICR and leaving the typed fraction 123456789/0000 in the corner. That fraction is the routing number. Cover it.

Using a statement as a voided check and leaving the ABA in the page-two footer. Search every page for the nine digits.

Emailing the unmarked check photo to yourself from a phone so a laptop can “redact later,” then forgetting and forwarding that email. Mark before the photo becomes an email attachment. The only file that should travel is the one that failed a search for the ABA.

Related guides

Explore more ways to redact PDFs privately, or use the redaction tool above:

• Redact Bank Account Number PDF
• Redact Bank Statement PDF

Frequently asked questions