CSV to JSON Converter
Convert CSV tables to JSON in your browser. JSON is ideal when you need developers, automation, and app data interchange, while CSV is better known for universal import into databases, scripts, and spreadsheets.
- Files never uploaded
- Instant, on-device
- Free & no sign-up
Drop CSV files here, or browse
CSVJSON · files stay on your device
up to 50 MB per file · up to 20 files per batch
How to convert CSV to JSON
- Step 01
Add your CSV file
Drop one or many CSV files onto the converter, or browse from disk. Stay within the on-device size limits shown under the drop zone — oversized files are rejected so your tab does not freeze.
- Step 02
Run the conversion
Start the CSV → JSON conversion. Parsing and rendering happen in your browser tab, which keeps contracts and spreadsheets off remote servers.
- Step 03
Download JSON
Download your new JSON file immediately. Multiple outputs pack into a single ZIP archive.
Why convert CSV to JSON
APIs and front-end apps speak JSON objects, not comma-separated rows. This conversion maps headers to keys so each CSV line becomes a structured record ready for code.
When to use this tool
- You are seeding a web app, mock API, or NoSQL collection from a spreadsheet export.
- A developer asked for JSON fixtures instead of a CSV attachment.
- You want to inspect row objects quickly in an editor.
Good to know
- The first row is treated as property names.
- Empty cells become empty strings or omitted values depending on structure.
- Very wide CSVs produce large JSON — fine for machines, noisy for humans.
- Browser limit: about 50 MB per file, up to 20 files per batch. PDFs are capped at 50 pages; large sheets at about 100,000 rows.
- Need a bigger file? For bigger PDFs or workbooks, use Adobe Acrobat, LibreOffice, Microsoft Office, or a desktop batch tool, then convert a trimmed copy here if you only need a quick private pass.
File size limits for CSV to JSON
Browser limit: about 50 MB per file, up to 20 files per batch. PDFs are capped at 50 pages; large sheets at about 100,000 rows.
Why there is a limit
Documents are parsed and rendered entirely in your browser tab. Oversized PDFs and spreadsheets can exhaust memory, so limits protect the tab while keeping files private.
If your file is too large
For bigger PDFs or workbooks, use Adobe Acrobat, LibreOffice, Microsoft Office, or a desktop batch tool, then convert a trimmed copy here if you only need a quick private pass.
CSV to JSON FAQ
Common questions about converting CSV files to JSON.
Is this CSV to JSON converter free?
Yes. Browser Convert does not charge for CSV → JSON, add watermarks, or require an account.
What happens to formatting when I convert CSV to JSON?
Expect a faithful but not always pixel-identical transfer. native fit for APIs, configs, and JavaScript apps matter most for JSON, while exotic CSV features (no formulas, formatting, or multiple sheets) may simplify. Always spot-check important pages.
Do I need Microsoft Office or Adobe apps installed?
No. Browser Convert handles CSV → JSON in the browser without installing desktop software.
Is CSV to JSON conversion private on Browser Convert?
Yes. Your CSV table is processed in the browser. We do not upload the file to convert it, which is the main difference from typical online converters.
Are there file size limits for CSV to JSON?
Yes. Browser Convert accepts about 50 MB per file, with up to 20 files queued at once. Documents are parsed and rendered entirely in your browser tab. Oversized PDFs and spreadsheets can exhaust memory, so limits protect the tab while keeping files private. If your file is larger, For bigger PDFs or workbooks, use Adobe Acrobat, LibreOffice, Microsoft Office, or a desktop batch tool, then convert a trimmed copy here if you only need a quick private pass.
Can I convert several CSV files to JSON at once?
Yes. Queue up to 20 CSV files and convert them in one pass. When finished, download the batch as a ZIP. Very large batches may need to be split so your browser stays responsive.