Easy Hasher

MD5 / SHA-1 / SHA-256 / SHA-512 Phone 10-digit normalize Multi-file hashing Combine & dedupe

Upload files, pick columns, and export hashed outputs in seconds. Everything runs in your browser, no server required.

How it works

Upload CSV / Excel
Select column(s) and hash type
Preview result and download

Standard hashing

One file · one column · deduped

Hashes a single column, returns one hash column with duplicates removed.

Upload a file

Large files run entirely in your browser; for very big datasets you may prefer a backend solution.

Hash type

Normalize to 10-digit phones (auto-detect)

Column to hash

Result (first 10 unique hashes)

Advanced hashing

Multi-file · rename · add/replace · ZIP

Upload multiple files, choose columns, and output per-file hashed CSVs and an optional ZIP.

Upload file(s)

Hash type

Columns to hash

If none selected for a file, its first column is used.

Suffix for added hash columns (Add mode)

Normalize to 10-digit phones (auto-detect per column)

Columns to keep in output

Keep & replace — replace each selected column with its hash (same name). Keep all & add — keep file as-is and add hash column(s) using the suffix. Keep only hashed column(s) — output just the hash column(s).

Manually rename columns before hashing

Downloads

Combine files

Merge hashed outputs

Merge multiple files into one output. Defaults: drop duplicate rows ON, no source filename column.

Upload file(s) to combine

Drop duplicate rows

Add source filename column

Output format

Browser version outputs CSV. Parquet is better handled on a backend.

Combined file name