Both trigger the same legal duties under 15 U.S.C. § 1681i. Online is faster to submit; certified mail lets you explain the error in your own words, attach every document, and prove what you sent and when the bureau received it.
The FTC and CFPB both note that Equifax, Experian, and TransUnion accept disputes online, by phone, and by mail. The Fair Credit Reporting Act does not favor one method: once the bureau receives a dispute, it must reinvestigate within 30 days, forward your relevant information to the furnisher within 5 business days, and consider what you submitted (15 U.S.C. § 1681i(a)(1), (2), (4)).
The practical differences are in what you can send and what you can prove.
Disputing online
- Pros: quick to submit, instant confirmation number, status tracking, and results often posted to your account.
- Cons: you may be limited to choosing a reason from a menu and a short text box; document uploads may be limited; and you are relying on the bureau’s system for a record of exactly what was submitted. Creating an online account also typically requires agreeing to the site’s terms of use, so read them.
If you dispute online, take screenshots of every screen you submit, save the confirmation number, and download any results.
Disputing by mail
- Pros: you control the explanation and can attach every supporting document. The FTC and CFPB recommend certified mail with a return receipt, which proves the date the bureau received it, the date the 30-day clock starts.
- Cons: slower, and you will need to keep copies of everything.
Use the dispute address listed on your report or on the bureau’s website.
Which to choose
For a simple, obvious error, an online dispute may resolve it. For anything more involved, such as a mixed file, identity theft, a reinserted item, or an item already “verified” once, a detailed mailed dispute with documents creates a clearer record of what the bureau was told.
See how to dispute credit report errors for a step-by-step guide.
Related
- How to Dispute Credit Report Errors With Equifax, Experian and TransUnion
- Equifax lawsuit guide
- Experian lawsuit guide
- TransUnion lawsuit guide
Sources
- FTC — Disputing Errors on Your Credit Reports
- CFPB — How do I dispute an error on my credit report?
- 15 U.S.C. § 1681i — Procedure in case of disputed accuracy (Cornell LII)
Updated November 2026. This page is general information, not legal advice.