CSV to JSON
converter

Convert CSV files to JSON for free. No install, no sign-up, and many files at once.

What are CSV and JSON?

To convert CSV to JSON, add your files, pick JSON as the output and press Convert. It is free, needs no sign-up and handles many files at once. This conversion runs inside your browser, so your files are never uploaded.

CSV is a plain-text table with columns separated by commas; it opens straight in Excel.

JSON is a text format programs use to exchange data.

Updated November 1, 2026

How to convert CSV to JSON

Drop your CSV files here or press “Choose files”. Several at once is fine.
Check the output says JSON. Open “Options” if you need to adjust anything.
Press “Convert”, then download each file or all of them as a ZIP.

The format you need, without the wait

Images, PDFs and data convert in your browser; documents, video and audio on our server. Saved files are deleted after 24 hours.

heic → jpgTrip photo 0412.HEIC2.4 MB → 1.1 MB · −54%Converted on this deviceDownload
Photos and PDFs stay on your device
HEIC, PNG, JPG, WEBP and SVG conversions, and merging, splitting and editing PDFs, all happen in your browser. Nothing to upload.
hwp2026 business plan.hwpConverting on the server…→ PDFConverted on our server · deleted after 24h
Documents and video go to our server
Word, PowerPoint, Excel and HWP become PDF; video becomes MP4, MP3 or GIF. Pick a target size and we fit the file to it.
mp4 → mp3Keynote recording.mp3MP4 → MP3 · today 14:32Deleted in 23 hoursDownload · Delete
Gone from our server after 24 hours
Files in your history can only be downloaded by you, and they are deleted automatically after a day.
Email attachmentMessagingQuality 80 · Size 50% · Target 2MBConvert · under 2MB
Shrunk to the size you need
Pick a purpose, 10MB for email or 2MB for chat apps, and the file is fitted under it.
1235contract.pdf · 12 pagesPage range1-3, 5Keep only these
Keep only the PDF pages you want
Rotate, reorder or duplicate pages, or type a range like 1-3, 5 to keep just those.
png → pdfquote.pdf1.8 MB → 640 KB · −64%NextCompressPasswordEdit pages
Carry a result straight on
Compress a fresh PDF or add a password to it right where it finished.

Frequently asked questions

Is it free?

Yes. It's free, with no sign-up, no watermark and no limit on how many files you convert.

Are my CSV files uploaded?

No. CSV to JSON runs inside your browser, so your files never leave your device. Only a converted result you keep in your history is stored, and it is deleted after 24 hours.

Is there a file size limit?

Each file can be up to 200MB. Add several files at once and convert them individually or download them all as one ZIP.

Can I make the file smaller?

Under Options, pick a target size (1–25MB). Images are fitted by quality and size, PDFs by compression level, and video or audio by bitrate.