01
Choose the real design axis
Move the vertical guide to the center that matters for this composition. A centered canvas is not always a centered motif.
Free bilateral design check
Tattoo Design Symmetry Checker
Compare a design with its mirrored reflection before you generate, print, or transfer. Choose the axis and the reference side, then inspect where bilateral structure matches and where it diverges.
This tool shows differences. It does not decide whether asymmetry is wrong.
Free to useNo accountNo beauty scoreYour design stays in your browser
Browser-local comparison
Add one design or reference.
Compare its left and right structure around an axis you choose. The tool highlights differences; it does not decide whether those differences should be corrected.
PNG, JPG, or WebP · up to 15 MB / 30 MP · drag and drop works too
Read structure, not taste
Use reflection as a reference, not a verdict.
Symmetry is useful when the design intent is bilateral: ornamental work, mandalas, sternum or chest pieces, geometric motifs, frontal masks or skulls, centered lettering, and similar layouts. It is irrelevant when the design is intentionally asymmetric.
02
Choose which side you trust
Left → right and right → left are explicit because an artist often has one resolved side that should drive the comparison.
03
Overlay before reading pixels
The overlay is the fastest visual check for contour alignment, motif position, spacing, and bilateral balance.
04
Use difference as a locator
The difference mask highlights reflected pixel changes above your tolerance. Texture, compression, shading, and intentional hand variation can all create legitimate differences.
Keep the owners separate
Design symmetry and body centerline are different checks.
One asks whether a design matches its own reflection. The other asks how a stencil relates to a visual axis chosen on a real body photo. Keeping those jobs separate prevents a useful design comparison from turning into a false anatomy claim.
Design Symmetry Checker
Does A match mirror(A) around the axis I chose?
One design in. Reflect either side, inspect overlay and difference regions, and export the comparison.
Centerline Checker
Is the stencil aligned to the body axis I chose?
Use two body landmarks plus a stencil when the job is placement alignment rather than internal design reflection.
Open Centerline CheckerFit to Body
How should the approved design follow body curvature?
Move downstream to wrap, taper, body-line direction, and body-photo placement only after the flat design decision is settled.
See Fit to BodyUseful output
Export the check you actually reviewed.
The PNG export records the selected view, axis position, reference side, and difference tolerance when relevant. Large inputs are capped to a 3200 px longest edge for a practical browser-local export instead of repeatedly processing the full raster while you drag controls.
Consultation snapshot
Export the mirrored or overlay view when you want to show what one reference side would produce across the chosen axis.
Difference locator
Export the difference view when you need a fast map of where reflected pixels diverge, with the tolerance preserved in the header.
Related tattoo tools
Keep each comparison job separate.
Use Centerline Checker for body-axis placement, Version Compare for A-vs-B revision review, or Reference Grid when the next job is proportional drawing guidance from the source image.
View all tattoo tools01Centerline CheckerMark an artist-chosen body axis on a real photo, place one stencil, compare design-axis angle and photo-relative center offset, then export a placement reference.2-point body axisAngle + center offsetBrowser-local PNG02Version CompareCompare two revisions of the same stencil with side-by-side, overlay, A/B blink, manual alignment, difference view, and a browser-local comparison PNG.Overlay + A/B blinkDifference viewComparison PNG03Reference GridFocus one tattoo reference, apply independent rows and columns with optional coordinates and landmark guides, then export a gridded reference and matching blank grid.Focus crop + custom gridA1 labels + guides2 browser-local PNGs
FAQ
Questions about bilateral tattoo design comparison.
The checker is deliberately narrow: reflection, axis, visual delta, and export. Artistic intent remains with the artist.
It compares one design with its own reflection around a vertical axis you choose. You can preserve the left or right side as the reference, inspect the mirrored result, overlay it on the original, or highlight pixel regions that differ.
No. A difference only means the two reflected regions do not match at the current axis and tolerance. Intentional asymmetry, texture, shading, and hand-drawn variation can all be valid artist choices.
It ignores small average RGB pixel differences before highlighting a mismatch. Raising the tolerance can suppress anti-aliasing, JPEG texture, or subtle shading noise; it does not make the design more symmetrical.
No. Symmetry Checker compares one design with mirror(A). Centerline Checker uses a body photo plus a stencil and measures the stencil against an artist-chosen visual body axis.
Use the visual overlay as the primary check and interpret the highlighted regions only inside the part that is meant to match. For a tightly localized check, crop a working copy to that motif before upload rather than treating unrelated artwork as an error.
No. Image decoding, reflection, pixel comparison, axis changes, and PNG export all run locally in the browser for this tool.
Need a stencil after the design check?
Move from design review into stencil preparation
Use the free web generator when the next job is creating the stencil, or continue in the iPhone app for the broader professional workflow.