csvjson is a clean, well-known CSV converter. Paste-and-convert stays local but the file upload path sends data to their server. PrivBatch never sends anything, anywhere.
csvjson.com has been around since the early 2010s and the interface shows it - clean, fast, no nonsense. The CSVJSON format (their own variant that allows trailing commas and comments) is genuinely useful for hand-edited data, and the JSON validator + beautifier are well-tuned. Free, no account required for basic conversions, and the team is honest about which paths go server-side - the disclosure is right there on the page.
If you only paste short snippets and the Flatfile banner does not bother you, csvjson is a perfectly good choice.
The split path is what changes the comparison. csvjson processes pasted text in the browser but their file-upload route sends data to the server, and they also collect anonymous column-header instrumentation. PrivBatch has one path: everything stays local. Paste, drop a file, drop 20 files - the browser does the work and nothing goes out.
You also get a Prove It toggle that counts every network request the page makes during conversion, and a Pro Business tier that produces a compliance certificate per conversion as evidence the data stayed local.
| Feature | csvjson.com | PrivBatch |
|---|---|---|
| Brand age / familiarity | ~13 years, well-known among CSV folks | Launched 2026 |
| CSVJSON variant (trailing commas, comments) | Yes (their own spec) | Strict JSON only |
| Session save / share with co-worker | Yes (server-side) | No (by design) |
| Free to use | Yes | Free tier covers all 23 tools |
| Paste-and-convert | Stays local | Stays local |
| File upload path | Sent to csvjson server | Stays in the browser |
| Anonymous header-name collection | Yes (per their own disclosure) | 0 |
| Ads on page | Yes (Flatfile banner) | 0 |
| Batch mode (multi-file in one go) | One file at a time | Yes (Pro, queue + ZIP output) |
| Prove-It network counter | No | Built-in toggle |
| Compliance certificate per conversion | No | Yes (Pro Business) |
PrivBatch Tie Competitor
You need the CSVJSON variant for hand-edited config, you want to save and share a session with a co-worker via their server, or you are converting non-sensitive sample data and the upload path is fine for your workflow.
The CSV contains customer data, financial records, GDPR-scoped fields, or anything else where "the file went to a third-party server" would be a problem on review. Or you want to convert 20 files in one pass and download a single ZIP.
Try the privacy-first version. 0 bytes transmitted on any path.
Open CSV ↔ JSON →