Strict mode
Use strict mode for monthly exports from the same system. It stops before output when any header or column order differs.
Merge TSV files without uploading them
Choose two or more TSV files, then require identical ordered headers or build a predictable first-seen union.
- Choose header handling, then select or drop your TSV files.
- Inspect the combined rows and columns in the editor.
- Use Download a copy for the complete merged TSV, or More document tools → TSV for the filtered view.
Files of 8 MiB or larger open in a paged TSV editor. Active-view TSV, CSV and JSON downloads are available for files under 8 MiB.
Merge options
Strict requires matching headers. Ordered union includes each encountered column.
Ordered union
Union mode keeps the first file’s columns, appends new columns as they appear, and fills missing fields with empty text.
TSV questions and answers
How are TSV files merged?
Choose 2 to 20 files, up to 50 MiB combined. Strict mode requires identical ordered headers. Ordered union keeps first-seen columns and fills missing fields with empty text. Files are appended in order, not joined by a key.
What are the TSV file and export limits?
Ordinary viewing accepts one file up to 5 GiB, subject to browser capacity. Files of 8 MiB or larger use a paged editor. Batch CSV and JSON conversion accepts files up to 1 GiB, subject to available browser storage, with cells under 1 million characters, records under 4 million characters and up to 4,096 columns. Without browser file storage, results are limited to 32 MiB. Active-view editor exports require files under 8 MiB. Merge accepts 2 to 20 files with a 50 MiB combined limit.
Does my TSV file leave my browser?
Selection, parsing, editing, merging and conversion run locally without signup or file-content upload. Download a copy to keep your work. Reload restores the original input, not unsaved edits.