Does rotating a stamp crop its corners?

No. The output canvas automatically expands to fit the full rotated bounding box, so corners are never clipped, even at odd angles.

What fills the newly exposed corners after rotation?

Fully transparent pixels, since PNG supports an alpha channel; the corners around a rotated rectangular stamp are transparent rather than a solid color.

Can I rotate counter-clockwise?

Enter a custom angle greater than 180 (for example, 270 rotates 90 degrees counter-clockwise) or a negative value; rotation is computed clockwise from the entered degree value and negatives wrap automatically.

Will rotation blur the stamp's edges?

Rotation uses nearest-neighbor sampling, which keeps edges crisp for exact 90/180/270 degree turns; arbitrary angles can show slight stair-stepping since no smoothing is applied.

Stamp Rotator - Rotate a Stamp Image by Any Angle Online

Overview

Introduction

This tool rotates a digital stamp image by any angle, entirely in your browser, using the same inverse-sampling rotation technique as this site's general PNG rotator.

Because the canvas expands to fit the full rotated shape, you never lose corners the way a fixed-size rotation would.

What Is Stamp Rotator?

A client-side rotation tool that reads an uploaded stamp's pixel data and applies an inverse-rotation sampling pass to build a correctly-sized output buffer.

It supports the common 90/180/270 degree presets as well as any custom angle from 0 to 360 degrees.

How Stamp Rotator Works

For every pixel in the new, larger output canvas, the tool works backward: it rotates that pixel's position by the negative of the requested angle to find where it would have come from in the source stamp, then copies that source pixel's color.

Positions that fall outside the original stamp stay transparent, avoiding any gaps a naive forward rotation would leave.

When To Use Stamp Rotator

Use it to straighten a crookedly scanned stamp, or to rotate a stamp graphic to a specific orientation before placing it in a document or design.

It's also handy for testing how a stamp looks at different angles when composing a layout.

Often used alongside Stamp Cropper, Stamp Resizer and Stamp Border Remover.

Features

Advantages

Runs entirely client-side; the uploaded stamp is never sent to a server.
Never clips corners, since the canvas expands to fit the rotated bounding box.
Supports exact preset angles as well as any custom degree value.

Limitations

Nearest-neighbor sampling means non-90-degree rotations can show slightly jagged edges rather than smooth anti-aliased ones.
Rotating a very large stamp image near the 4096px cap can take a moment since every output pixel needs its own calculation.

Examples

Straighten a crooked scan

Input

A stamp scanned at a slight tilt, custom angle -6

Output

The stamp rotated 6 degrees counter-clockwise to sit level

Negative angles wrap automatically, making small corrective rotations easy.

Rotate a square stamp 90 degrees

Input

A 200x200 stamp PNG, 90° clockwise

Output

A 200x200 PNG with the stamp turned on its side

A square stamp keeps its dimensions after a 90-degree rotation, even though the content turns.

Best Practices & Notes

Best Practices

Use the 90/180/270 presets when you need a pixel-perfect result with no interpolation artifacts.
Preview the result before downloading, since custom angles change the output image's dimensions.

Developer Notes

The pure rotation math lives in the shared png-rotator lib function's inverse-sampling implementation; this tool's lib file thinly wraps rotatePng rather than re-deriving the trigonometry.

Stamp Rotator Use Cases

Straightening a crookedly scanned rubber stamp impression
Rotating a decorative seal graphic to fit a diagonal layout
Testing multiple stamp orientations before finalizing a document design

Common Mistakes

Expecting the output image to keep the same dimensions as the input for non-multiple-of-180 rotations.
Rotating an already-cropped stamp and being surprised the canvas grows again to fit the new bounding box.

Tips

Combine 90-degree rotations with a flip tool to reach any of the 8 standard orientations.
If edges look jagged at a custom angle, start from a higher-resolution source scan for a cleaner result.

Stamp Rotator