• Calculate hash-deduplication storage savings in megabytes and as a percentage of the original payload.
• Apply the same explicit rule consistently during ingest, quality control, reporting, or preservation planning.
• Expose records that need human review without silently rewriting the source data.

The unique-size input is retained payload size, not the count of unique hashes.^[1]

• Equal hashes are treated as duplicate content; collision policy, metadata overhead, block-level deduplication, compression, and replica requirements are outside the calculation.
• Preserve the original value and record the rule version when using this result in an archival workflow.

• Checksum Fixity Verification Pass-Fail Comparator

  Use Checksum Fixity Verification Pass-Fail Comparator to compare expected and recomputed checksum strings after trimming whitespace and normalizing hexadecimal letter case. Choose this tool when you need to calculate hash-deduplication storage savings in megabytes and as a percentage of the original payload.

• Born-Digital Disk Image Size TB Aggregator

  Use Born-Digital Disk Image Size TB Aggregator to aggregate nonnegative disk-image sizes into image count, total terabytes, and average terabytes per image. Choose this tool when you need to calculate hash-deduplication storage savings in megabytes and as a percentage of the original payload.

• Born-Digital Disk Image Size TB Aggregator

  Aggregate born-digital disk image accession sizes in terabytes into a count, storage total and mean image footprint.

• WARC File Compression Ratio Savings Percent Calculator

  Compute the storage compression ratio and percent savings for a WARC web archive from its uncompressed and compressed byte sizes.

• IIIF Image URL Parameter Sequence Formatter (v2)

  Assemble a canonical IIIF Image API 2.1 request URL, using the v2 default size keyword 'full' and percent-encoding special characters—including slashes—inside the image identifier.