Whether our sins will be uncovered and exposed for others to see on Judgment Day depends on which judgment we attend. Believers in Jesus Christ will attend the Judgment Seat of Christ, while unbelievers will face the Great White Throne judgment.
During the Judgment Seat of Christ, believers will not be judged for their sins, nor will their sins be exposed, because Jesus’ blood eradicated them on the cross, never to be remembered again. Hebrews 8:12 says, “For I will be merciful to their iniquities, and I will remember their sins no more.” It also says in Colossians 2:13-14, “When you were dead in your transgressions and the uncircumcision of your flesh, He made you alive together with Him, having forgiven us all our transgressions, having canceled out the certificate of debt consisting of decrees against us, which was hostile to us; and He has taken it out of the way, having nailed it to the cross.”
Instead, believers will either receive rewards or lose them for their earthly works at the Judgment Seat of Christ (see 1 Corinthians 3:11-15). The Bible does not disclose whether every believer will be present during every other believer’s judgment. But passages like Matthew 6:1-6 seem to imply this, since God will dispense rewards openly. Regardless, believers will not be privy to each other’s sins, even if the Judgment Seat of Christ is an all-inclusive event for believers, because Jesus’ blood washed them all away.
In contrast, at the Great White Throne Judgment, unbelievers will be judged for their sins, unbelief, and earthly deeds and works. During this dreadful event, God will judge each individual according to what is written in various books before casting them into the Lake of Fire for rejecting Jesus Christ as Savior. The Bible indicates that this judgment will be all-inclusive, with every unbeliever present (see Revelation 20:11-15).
As such, every unbeliever will be privy to all other unbelievers’ sins as God judges each one. However, that information will be of no concern or consequence to them, given their own impending and frightful judgment, for Hebrews 10:31 says, “It is a terrifying thing to fall into the hands of the living God.”
I hope this information helps clarify whether others will know our sins on Judgment Day.