November 25, 2025
Trust issues meet text issues
Show HN: Secure private diffchecker with merge support
New ‘private’ diff tool drops; users demand open source and swear by Beyond Compare
TLDR: A free, client‑side diff and merge tool promises privacy by keeping data in your browser and share links encoded in the URL. Commenters demand open source, question “100% private” claims, and many stick with Beyond Compare—plus a funny list bug that started at step 8.
A new online compare-and-merge tool, diffchecker.dev, promises fast, client‑side, and 100% private text comparisons—think: a web page that shows what changed between two documents without sending anything to a server. It even merges changes and handles huge files. But the comments? Pure drama.
The loudest chorus: “Open it up!” One early voice asked if it’s FOSS (free and open-source software), because trust online starts with transparency. Then came the privacy showdown. Skeptics rolled in hard, arguing you can’t “prove” a web tool is private and warning that ads or future owners could flip the switch. The mood: trust issues meet text issues.
Meanwhile, a loyalist faction flexed their favorites: one commenter swore by the old-school local app Beyond Compare, basically saying the new kid can’t beat the champ—especially for fancy table comparisons. And for comic relief, someone spotted a CSS hiccup where the “Step 1” list started at… Step 8. Cue memes about “8 easy steps” to privacy.
So yes, the tool claims the share links pack your data into the URL and nothing touches a server. But the crowd wants receipts: open source code, proof, and no surprises. It’s a classic HN split—shiny features vs. show us the trust—with a side of counting jokes.
Key Points
- •diffchecker.dev is a fully client-side diff tool with no uploads or sign-ins, focused on privacy.
- •It provides real-time, character-level comparisons and supports merging changes between panels.
- •The engine handles large files (25k+ lines) and offers context controls to collapse unchanged lines.
- •It supports structured formats like JSON, XML, and YAML, and can save diffs locally in browser storage.
- •The Share feature encodes content within the URL, and the service is free for unlimited comparisons and merges.