Decide what must work
For tracing a copy, success means detecting the correct watermark. Before you test, decide the lowest detection rate, quality, speed and cost you can accept. Compare providers with the same files and settings.
Include the difficult files
- Use real photos, dark scenes, flat graphics, fine text, PDF layouts and video clips within each service’s limits.
- Save the originals and the watermark you expect in each. Give each test copy a different reference.
- Include unmarked files to catch false detections. Reserve fresh examples for the final check.
Recreate the sharing journey
First detect the untouched output. Then test each change and the full sequence your files go through. Record tools, versions and settings.
| Content | Try these changes |
|---|---|
| Images | Resize, crop, compress, screenshot, then upload and download through your usual platform. |
| PDFs | Capture a page, export from another viewer, and test printing or scanning if relevant. |
| Video | Trim a clip and export it at different sizes and quality settings. Check that the delivered file plays correctly. |
Count successes and failures
- Correct matches
- Files that returned the exact watermark, out of every file you tried. Include files that couldn’t be watermarked in the total.
- False detections
- Positive results on unmarked files out of all unmarked files tested. Flag any wrong match to a watermark you created.
- Incomplete results
- List missed marks, wrong watermarks, mixed pages or frames, refused files and timeouts separately.
Report counts with percentages. Zero errors in a small sample does not establish a zero error rate.
Look at the delivered file
Compare originals and outputs at normal size, then zoom in. Check text selection, editable layers, animation, audio and playback where relevant. Quality scores can help, but inspect the work yourself.
Keep a test you can repeat
Save each file, the expected and detected watermarks, settings, page or frame results, time, cost and quality notes. Keep failures too. Repeat when your export tools or sharing process change.