Prepare a small permitted image crop

Private prototype, not release-qualified. Choose a correction sidecar and a PNG page raster already on your device. No original is uploaded or changed. For multi-gigabyte documents, first create a permitted page raster outside this tool. Do not select confidential or personal records.

PNG input only: at most 20 MiB, 8192 pixels per side and 16 megapixels total. Crop: at most 512 pixels per side, 131072 pixels total and one quarter of the page. Output PNG at most 64 KiB; packet at most 100 KiB. Browser decoding and canvas colour conversion can change raster pixels; this is a derivative, not original evidence bytes.

Reading and view size100%

These display controls do not change source or crop pixels.

Region in decoded PNG pixels, origin at top left

Adjust the four number fields with the keyboard arrow keys. The outlined region updates on the page reference. Source pixels are not changed.

Nothing uploaded. Draft fields are not automatically saved.

Correction linkage, permission and page provenance are assertions. Hashes detect mismatching content, not identity, rights or Archive approval. Keep disagreements and previous versions. This tool does not submit to GitHub or Internet Archive.