03
EMIT
Pretty or minified
Indented JSON for readability. Minified for the API call. The choice is yours, the file is local.
What it actually does
02
MAP
Header → key
Each row becomes a JSON object keyed by the header line. Nested keys via dot-notation if your headers ask for it.
04
BATCH
One file or two hundred
Drop a single sheet or a folder of them. Free tier has no batch limit — only your device's RAM.
How it works
- Open morph.cool in any modern browser. No install, no account.
- Drop the CSV — single file or full folder. No batch limit.
- Pick JSON from the format menu. The parser runs locally.
- The .json downloads to your machine. The .csv stays untouched.
- Repeat for every spreadsheet you have. No quotas, no watermarks.
0Upload
∞Batch limit
1-clickExport
Why people leave the upload-and-queue tools
Every CSV-to-JSON tool that ranks in Google looks the same: drop the file, hit a 50MB cap, watch a queue, sit through an ad, get back a malformed array because the tool didn't handle the embedded commas in your description column. Morph's parser is RFC 4180-aware, runs in WebAssembly, and never leaves your tab. The data engineering crowd uses it because it's faster than spinning up jq. The privacy crowd uses it because nothing uploads.
Frequently asked
How is this different from the online converter sites?
Those tools upload your CSV to a server, queue it behind everyone else's job, and cap free conversions by file size. Morph runs the parser via WebAssembly in your browser — no upload, no queue, no ad wall, no quota.
Does it handle quoted fields and escaped commas?
Yes. The parser is RFC 4180-aware. Quoted strings, escaped quotes, embedded commas, multi-line fields — all handled correctly.
Can I batch a whole folder of CSVs?
Yes. Drop ten files, drop two hundred. Free tier has no batch limit — your device's RAM is the only constraint.
What about other delimiters — semicolons, tabs?
Auto-detected. The parser sniffs the first line and picks the right delimiter. Override is available if you need it.
Is the JSON pretty-printed or minified?
Default is pretty (2-space indent). One toggle for minified. Both produce valid, parser-compatible JSON.
Is there a free tier?
Yes. Everything that runs on your device is free with no cap. AI and server work is paid in credits, about a cent each.
Nothing leaves your device · Free for what you make, credits for what we run