Cover a Local Image with a Repeating Text Watermark Pattern

How to Use This Tool

Preview spacing, angle and opacity before exporting a flattened PNG. Apply a repeating text watermark across a local image, control spacing, angle and opacity, preview real pixels, and download a flattened PNG privately.

The work this page finishes

A single corner mark is easy to crop; repeating a mark manually with consistent spacing, angle and opacity is tedious and hard to reproduce. For Tiled Watermark, keeping source order beside the computed artifact lets a user repair only the failed entries and reproduce the same batch later.

Deterministic workflow

Create an offset grid beyond every image edge, rotate the canvas around each grid point and draw the same text with the selected global alpha before flattening to PNG. For Tiled Watermark, a run is capped at 5,000 items and 2 MB, preventing an accidental oversized paste while preserving successful rows when another row fails.

Why a dedicated interface helps

Tune readability against both light and dark regions, then retain the unwatermarked original; a visible mark discourages casual reuse but cannot guarantee protection. For Tiled Watermark, a purpose-built form exposes every assumption and returns the same ordered structure on every run, which is more practical than reconciling shifting conversational output.

Assumptions

• The browser can decode the selected image.
• The entered text is suitable for visible marking.
• Flattened PNG is an acceptable delivery format.

For Tiled Watermark, keep an untouched copy for comparison after import; the browser performs the work locally, but local software and extensions are not controlled by this page.

Limitations and review boundary

Watermarks can be removed or cropped and do not establish ownership by themselves; PNG export discards original metadata and may increase file size. For Tiled Watermark, the implementation neither follows user-entered links nor evaluates their contents, and it displays material as plain text rather than active HTML.

Verification and provenance

Fixtures derived from the displayed rule and MDN — Canvas API were reviewed on 2026-08-26; they include normal, empty or invalid, and partial-failure behavior. The 1200 × 800 model with 180 px spacing estimates a bounded grid that extends past every edge so rotation does not expose large gaps.