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; extremely big datasets may hit memory limits.

Hash type

Normalize to 10-digit phones (auto-detect)

Uppercase input before hashing

Hashes as UPPERCASE

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

Click items to toggle. 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)

Uppercase input before hashing

Hashes as UPPERCASE

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

Swap / Difference

Compare File A vs File B

Upload two files, choose a column in each, and export the rows that exist in one file but not the other.

File A

Used as the default source for “A minus B”.

File B

File previews

File A

File B

Column in File A

Column in File B

Direction

Rows in File A whose Records are not in File B (A \\ B). Rows in File B whose Records are not in File A (B \\ A).

Drop duplicate rows in the result

Hash rows before comparing

Useful when one file stores plain values and the other stores hashes(does not hash output).

Hash type (for comparison)

Normalize to 10-digit phones (auto-detect)

Uppercase input before hashing

Hashes as UPPERCASE

If hashing is off, key comparison is case-insensitive (trim + uppercase). If hashing is on, comparison uses the hashed keys with the options above.

Preview (first 25 difference rows)

Note: this tool loads both files fully in your browser; extremely large files may not fit in memory.

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