Free browser tool
Paste or upload a DICOM tag dump — from pydicom, dcmdump, dcm4che, DICOM JSON, or a CSV export — and read it as a clean, searchable table. Structured Reports become one row per measurement. Add a second or third dump and every match and difference lines up side by side. Runs entirely in your browser.
A DICOM instance carries hundreds of attributes as (group,element) tags — patient, study, series, equipment, and image data all mixed into one flat header, and a Structured Report hides its whole report in a deeply nested Content Sequence. Reading that in a raw dump is slow and error-prone, and so is checking what changed between two exports (an anonymization pass, a PACS or VNA migration, a scheduled order versus what was actually stored, or two vendors’ exports of the "same" study). DICOM Tag Compare is a free, client-side tool for radiology IT and PACS administrators that does both. As an analyzer, it turns one pasted dump into a sorted, searchable table with plain-language names, grouped by DICOM module, and reads a Structured Report as one row per measurement. As a compare tool, it lines two or three dumps up in one table — matching, different, or present in only some — and matches report measurements by meaning, so a missing or extra measurement does not shift the rest. Nothing is uploaded; parsing and comparison happen entirely in your browser tab.
Line up dump A, B and C in one table: every tag with its name, VR and value, and a status per row — match, different, only in A, only in B, only in C or partial. Sorted by tag, with counts and one-click filters, for example differences only.
An OB-GYN ultrasound or other Structured Report hides its report in a deeply nested Content Sequence. The Report view turns it into readable rows — Estimated Weight 77 g, Abdominal Circumference 72.56 mm — with units, derivation and equation folded into the value. Switch it off for the raw tags.
Report measurements are matched by their concept code, so a missing or extra measurement does not shift the rest. Repeated groups, such as several biometry groups, are told apart by what they measure, and the report order is kept.
Group the table by DICOM module — Patient, General Study, Image Pixel, PET and more — or, in a Structured Report, by report section. Private tags are grouped per private creator, such as Private: ELSCINT1. A button per group, with its row count, scrolls to the group and highlights its rows.
Paste just one dump for a sorted, searchable listing with plain-language attribute names from a curated PS3.6 dictionary. Search by tag or attribute name; the comparison filters appear when you add a second dump.
pydicom dataset printouts, DCMTK dcmdump and dcm4che-style dumps, tab-separated and two-line PACS-viewer exports with sequences, a DICOM JSON model (PS3.18 Annex F), CSV/TSV with Tag/Description/VR/Value columns, or plain Keyword: value lines.
On paste, the tool offers to replace the patient name, ID and birth date — including the patient inside a Structured Report — with synthetic values, and says where your data stays. Private vendor tags that look like they identify people, such as a doctor or physician ID, a study reason or a value copied from the patient, are flagged and scrubbed too. A mask switch hides patient-identifying values before you take a screenshot.
Download the current, filtered rows as CSV or JSON. The tool has a light theme in warm sand and a dark theme, both with high-contrast controls.
Load one of the eleven built-in synthetic samples, no real data needed: analyze a single CT slice, compare a CT series reconstructed two ways or an MR scanner before and after an upgrade, read Structured Reports from two OB-GYN ultrasound exams or a CT dose report, see a PET-CT whose private tags still carry a doctor ID after anonymization, or check an anonymization pass, a PACS migration and an order against the stored study. Or paste your own tag dumps straight away.
Educational analysis and comparison aid for radiology IT, not a DICOM conformance validator or a clinical viewer. Prefer synthetic data when sharing screenshots with others.