VectorPaint SVG compatibility checks: isolate missing images, masks and gradients

English translation of the Chinese original, translated on 2026-10-26. Original publication dates, attribution, code and version notes are retained.

Opening an SVG does not guarantee identical rendering everywhere. Use an owned test drawing to compare the editable original, exported SVG and target renderer. The workflow isolates differences without promising universal repair of arbitrary SVG files.

Freeze a reproducible original first

Save the original and create an independent diagnostic copy. Record app version, export time, target software and the exact affected object or region. Replace private content with neutral test material where possible. Reopen the export to confirm reproducibility before deleting anything from a copy; never experiment on the sole original.

Separate renderer behaviour from document content

Compare the identical export in two available renderers, avoiding stale copies. If only one fails, record that distinction rather than declaring the original corrupt. If both fail, inspect the source object. Use separate revision folders and export times. Prefer existing trusted viewers and note extra scaling, clipping or background changes.

Narrow the issue by hiding groups

Hide half the major layers in a copy, export and continue narrowing the relevant half. Change one category at a time and record which combinations reproduce the issue. Hiding preserves recovery. For a masked-group issue, inspect paths, images and transparency without simultaneously outlining text and changing gradients. Keep a baseline export for comparison.

Check images, text and paths separately

For missing images, confirm raster content in the original and target export; SVG may contain bitmaps. For changed text, check fonts and wrapping, then compare a separate outlined copy. For path issues, inspect closure, fills and strokes with complex effects removed. Keep distinct records for raster blur, font substitution and missing geometry.

Build minimal mask and gradient examples

Test a single rectangular mask with one owned image, or one shape with a basic gradient, then add original complexity gradually. Results apply to that example and renderer, not every nested mask or gradient configuration. Keep notes outside the drawing so text does not add another font variable. Name tests clearly and retain the smallest reproducer.

Choose a delivery workaround for the actual use

For display-only use, provide a sufficiently sized PNG while retaining the editable original and unresolved SVG. For path editing, agree on acceptable simplification and adjust a copy. Renaming extensions is not conversion, and a working alternate format does not prove the original issue fixed. Reopen the delivered file and label its use, revision and known differences.

Retain a known working control example

Keep a simple rectangle/circle/solid-fill control exported with the same settings. If even it cannot open, inspect transfer and viewing conditions before blaming complex masks. Compare a working control with the minimal failing case from the same export round. Record observations rather than unverified defect claims. Retaining both controls helps distinguish behaviour changes from changed test conditions.

Keep a reproducible issue record

Retain the source copy, minimal reproducer, observations and renderer version. Describe only observed results. Remove private material before sharing a report and give minimal reproduction steps. If unresolved, preserve the baseline and use a confirmed delivery workaround. Repeat the same minimal test after future changes to assess whether behaviour actually changed.