Convert XLS to NDJSON
Free, fast XLS → NDJSON. No watermarks, no sign-up.
How to convert XLS to NDJSON
1. Upload XLS
Drop your XLS file into the converter above.
2. Confirm NDJSON
Output is already set to NDJSON. Adjust only if you need to.
3. Download
Convert and download your NDJSON file instantly.
Format Details
XLS
XLS is the legacy binary spreadsheet format used by Microsoft Excel from 1987 through the Office 2003 era, based on Microsoft's proprietary Binary Interchange File Format (BIFF). It stores worksheets, formulas, charts, and macros in a binary structure that requires Microsoft's format specification to parse correctly. XLS remains common in older enterprise systems and when compatibility with legacy versions of Excel is required.
dataNDJSON
NDJSON (Newline Delimited JSON) is an alias for JSON Lines — one JSON object per line, ideal for streaming datasets and LLM training exports. Convert to CSV, JSON, Parquet, XLSX, and other data formats.
dataConverting XLS to NDJSON: what actually changes
XLS to NDJSON is one of the conversions this site performs, but the two formats are not interchangeable containers. Here is what the file keeps, what it loses, and how to get a result you can use.
What .XLS and .NDJSON each hold
.XLS is a data format built for analysing, importing or exchanging records, storing rows, columns and value types. .NDJSON is a data format built for analysing, importing or exchanging records, storing rows, columns and value types. Converting between them is a decision about which of those two jobs the result needs to do.
What changes in the conversion
Both files belong to the data category, so this is a like-for-like repackage: the same kind of content, stored in a different container. What changes is how .NDJSON encodes rows, columns and value types — not what the file is about.
When this conversion is the right one
Reach for .NDJSON when the software, device or platform you are sending to expects it — the content is the same data, only the packaging differs. The reverse direction works the same way, so you can always convert back from .NDJSON to .XLS using the same tool.
Tips for a clean XLS to NDJSON conversion
Start from the original file
Convert the .XLS you started with, not an earlier .NDJSON output. Every extra round trip costs quality and can accumulate formatting drift.
Check the real type, not the extension
Application/vnd.ms-excel becomes application/x-ndjson. If a file was renamed rather than converted, it will fail to open — rename it back to its true extension before uploading and the conversion will recognise it.
Confirm the structure first
Open the .XLS briefly and check delimiters, headers and encoding. A misplaced separator or a stray quote is the usual reason the output looks wrong even though the conversion succeeded.
Limits worth knowing
Uploads are capped per file (30 MB, or 100 MB for video) and processed temporarily — nothing is kept as a permanent copy. For huge data files, split or compress the source first.
Frequently Asked Questions
How do I convert XLS to NDJSON?
Upload your XLS file on Convertek, select NDJSON as the output format, then click Convert. Your NDJSON file will be ready to download instantly.
Is the XLS to NDJSON converter free?
Yes. Converting XLS to NDJSON on Convertek is completely free with no watermarks. Fair upload limits apply (typically 30 MB per file).
Is my file kept after conversion?
No. Files are processed temporarily and not stored permanently. Converted downloads are available only in your browser session.
What is the difference between XLS and NDJSON?
XLS and NDJSON are different file formats with distinct use cases. Converting between them lets you use your file in software or workflows that require the NDJSON format.