Show HN: Secure private diffchecker with merge support

10 comments

·November 25, 2025

Built a minimal diff checker with merge feature.

1. Supports 25K+ lines.

2. Character level instant diff.

3. Diff merge feature.

4. Share able links.

5. 100% secure, all diff computation happens in browser.

No other website offering high quality diff checker and merge feature with just browser only implementation.

Please review the website in detail and share feedback.

Visit

jiehong

I’m still finding a local instance of Beyond Compare [0] unbeatable.

Especially its table compare feature [1].

[0]: https://www.scootersoftware.com/

[1]: https://www.scootersoftware.com/v4help/viewdata.html

subhash_k

Never had a need to do table comparison. Looks like customised csv diff comparison. Will look into and see if i can add it as feature or different page/tool.

jiehong

I needed it for diffing big csv files where the diff was complicated to understand, and limited to some columns out of 30+ columns.

Might be niche, though.

recursive

Some of the CSS is making the numbered steps start at 8 instead of 1. In particular

    ol { counter-reset: steps; }

subhash_k

Can you please share the link of diff? You can copy it from the website after input by clicking share as url button, so that it will easy for me to debug. Thanks for the feedback.

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runningmike

Do you release the code as FOSS?

subhash_k

Unfortunately No. Planning to monetize through ads once UI is polished.

bramhaag

Why would releasing the code under a FOSS license prevent you from adding ads?

subhash_k

To be honest. Never really thought about it fully. I don't know monetization plan as well. I just wanted to create better private version of diff checker and merge. Will think through and update here.