Can file hashing detect if a CSV was modified after delivery?

Yes. Any change to the file's contents — even a single character — produces a completely different hash. Compare the hash of the received file against a baseline hash from the sender to confirm the file is unmodified.

What is the file size limit for CSV and Excel files?

CSV files are supported up to 500MB, Excel (XLSX/XLS) files up to 200MB. Per-batch limits are 50 files or 2GB total, whichever comes first.

Does the tool compare hashes automatically, or do I need to compare manually?

The tool generates hash values and outputs them in a plain-text report. Comparison against a baseline is done manually or via your own scripting — the report format is easy to parse.

Which algorithm should I use to verify data file integrity?

SHA-256 is the current standard for integrity verification and is included by default. MD5 is faster but has known collision vulnerabilities and is generally not recommended for security-sensitive use cases.

Can I hash JSON files from API exports?

Yes. JSON is a supported input type. Upload your API export file directly and receive a checksum for it in the report.

Detect Data File Changes Before They Corrupt Your Pipeline

A CSV or JSON export that looks identical can differ byte-for-byte after a system migration, an ETL job, or an upstream schema change — and downstream pipelines will load the wrong data silently. Deliteful's File Hash Checker lets data engineers generate MD5, SHA-1, SHA-256, and SHA-512 checksums for data files to catch changes before ingestion.

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Data engineers working with recurring file-based ingestion pipelines face a specific integrity problem: how do you know the file you received today is actually different from the one you loaded last week, beyond a naive row count check? Cryptographic hashing is the reliable answer — a single changed byte produces a completely different hash. This is especially critical when validating vendor data drops, confirming reprocessed exports, or auditing file lineage in a data warehouse.

Deliteful supports hashing CSV, JSON, Excel (XLSX/XLS), and other common data file formats up to 500MB for CSVs and 200MB for Excel files. All algorithms run in a single streaming pass, and the plain-text checksum report is straightforward to incorporate into a data quality checklist or audit log. Batch processing supports up to 50 files per run.

How it works

1
Sign in with Google
Create your free Deliteful account in seconds — no credit card needed.
2
Upload your data files
Drop in CSV, JSON, XLSX, or other formats. CSV files up to 500MB and Excel up to 200MB are supported.
3
Choose your algorithms
Enter md5, sha256, sha512, etc. as a comma-separated list, or leave blank to run all four algorithms by default (MD5, SHA-1, SHA-256, SHA-512).
4
Generate checksums
Deliteful reads each file in a single streaming pass and computes all requested hashes.
5
Save the report
Download the plain-text checksum report and store it alongside your data file as part of your ingestion audit trail.

Frequently asked questions

Can file hashing detect if a CSV was modified after delivery?: Yes. Any change to the file's contents — even a single character — produces a completely different hash. Compare the hash of the received file against a baseline hash from the sender to confirm the file is unmodified.
What is the file size limit for CSV and Excel files?: CSV files are supported up to 500MB, Excel (XLSX/XLS) files up to 200MB. Per-batch limits are 50 files or 2GB total, whichever comes first.
Does the tool compare hashes automatically, or do I need to compare manually?: The tool generates hash values and outputs them in a plain-text report. Comparison against a baseline is done manually or via your own scripting — the report format is easy to parse.
Which algorithm should I use to verify data file integrity?: SHA-256 is the current standard for integrity verification and is included by default. MD5 is faster but has known collision vulnerabilities and is generally not recommended for security-sensitive use cases.
Can I hash JSON files from API exports?: Yes. JSON is a supported input type. Upload your API export file directly and receive a checksum for it in the report.

Create your free Deliteful account with Google and start adding cryptographic integrity checks to your data ingestion workflow.