Watermark Remover Checker
Free image watermark checker that looks for EXIF software tags and corner traces before you remove a mark, with no upload.
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What is Watermark Remover Checker?
The Watermark Remover Checker inspects PNG and JPEG files for the traces watermark removal usually disturbs: software tags in EXIF and PNG text chunks, names of known watermarking and editing tools anywhere in the metadata, and a corner uniformity sample that flags solid overlay boxes. The per-check report lists every finding with its source alongside format, dimension and size provenance, and a reminder to keep the original untouched. All bytes are analyzed locally in your browser.
Key Benefits
- Metadata findings listed with their exact source
- Known watermark-tool fingerprints flagged automatically
- Corner uniformity percentages for all four corners
- Format, dimension and size provenance at a glance
- Entirely local analysis — confidential images stay private
Common Use Cases
- •Vetting licensed or stock images before use
- •Checking what an edited image still reveals about its tools
- •Documenting a file state before any watermark removal attempt
- •Auditing a batch of images for editing-tool fingerprints
- •Teaching how image metadata and text chunks work
How to Check an Image for Watermark Traces
- Open the image: Drop a PNG or JPEG onto the box. The bytes are read locally — the file never leaves your device.
- Read the provenance: The summary shows the true format, pixel dimensions and file size, which already reveals files renamed between formats.
- Review the metadata findings: Every PNG text chunk and JPEG software or artist tag is listed with its source, and any known watermarking or editing tool named in the metadata is flagged.
- Check the corners and copy the report: Corner uniformity percentages hint at solid overlay marks. Copy the report for your records, then work on a copy of the image — never the original.
Key Features
- PNG tEXt and iTXt chunk extraction with keys
- JPEG APP segment scan for EXIF software and artist tags
- Known watermark-tool name matching across all metadata
- Corner uniformity sampling to flag solid overlay boxes
- Copyable per-check report with format and dimension provenance
Frequently Asked Questions
Can this tool detect a visible watermark in the picture itself?
Not visually — it reads metadata and samples the four corners for uniformity. A solid or near-solid corner often marks an overlay box, a crop-out, or a removed mark, which is why the report shows each corner uniformity percent for comparison. Judging whether a corner is genuinely a watermark still takes your eyes and context.
What metadata does it read?
PNG text chunks (tEXt and iTXt) with their keys, and JPEG APP segments including EXIF — where software and artist fields commonly hide — plus any readable runs such as Adobe or XMP markers. Every finding is listed with its source so you know exactly where it came from.
Why does the tool flag Photoshop or Canva?
Those names in metadata are not proof of a watermark, but they are fingerprints of the tools most often used to add or remove marks. The flag is a lead for your review: an exported photo that names a watermarking app deserves a closer look before you treat it as clean.
Is my image uploaded anywhere?
No. The file is read with the browser File API, parsed byte by byte in JavaScript, and the corner sample is drawn to a local canvas. No bytes leave your device, so confidential or licensed images can be checked privately.