Before submitting
Check a paper, spreadsheet, or PDF for forgotten comments, hidden content, and document properties.
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Put your own notes on your TI-84
Type your study notes as cards and download them as one program for the TI-84 Plus CE Python. Add sections to get a menu. Free, and your notes never leave your browser.
Scan a document
Check PDF, DOCX, XLSX, and TXT files for concealed text, metadata, comments, revisions, hidden spreadsheet content, and invisible Unicode characters. Review the inspection method.
Everything here
Pick the tool for the job
- DocumentsDocument scannerFind hidden text, metadata, comments, and revisions in PDF, Word, Excel, and text files.
- TextInspect TextPaste text to reveal zero-width characters, odd whitespace, and Unicode controls. Runs in your browser.
- CodeInspect CodeCheck Python for invisible characters, syntax problems, and look-alike names without running it.
- LogicLogic ToolsBuild truth tables, simplify with Karnaugh maps, and work in binary and hex.
- Math and scienceCalculatorsUnit converter, formula lab, and scientific calculator for coursework.
- TI-84 Plus CE PythonCalculator programsHere from a DuckieDai program? Browse the library, read the source, and download.
Choose an inspection task
What do you need to check?
Start with the scanner above, or follow a focused inspection guide for your file and situation.
- Check a PDF for hidden textReview OCR layers, off-page text, annotations, attachments, and covered content.
- Inspect Word metadata and tracked changesFollow a DOCX example and review properties, comments, revisions and visibility findings.
- Find hidden Excel contentInspect concealed rows, columns, worksheets, formulas, names, and links.
- Detect invisible charactersReveal zero-width characters, unusual whitespace, and Unicode controls in your browser.
- Check a document before submitting itUse an evidence-first checklist for the final copy you intend to upload.
- Scan an assignment file for hidden instructionsUnderstand unexpected content without assuming why it is present.
- Review metadata and comments before sharingCheck properties and editing traces while preserving the unchanged original.
- Inspect a résumé fileReview metadata, hidden content, links, and editing traces without treating them as identity proof.
Built by a student
Made for clearer documents
Hidden Word Scanner is an independent student project by DuckieDai. It started with a simple idea: students should be able to understand what is actually inside the files they receive, use, and submit.
“Student project” describes its independent creator, not a school affiliation. No school or university sponsors, operates, reviews, or endorses this website.
This project turns difficult-to-see document evidence into findings that people can review, explain, and discuss.
Document transparency
Documents should not contain invisible surprises
A file can contain text or instructions that are not obvious when you open it normally—from hidden Word formatting and spreadsheet sheets to PDF text layers, comments, metadata, and zero-width characters.
For students, these elements can affect AI tools, automated review systems, accessibility software, and academic-integrity investigations. Hidden Word Scanner helps you inspect the evidence before submitting, sharing, or relying on a file.
The scanner does not write assignments or bypass plagiarism detection. Findings are review signals, not proof of intent, and a clean scan does not guarantee that a document is safe.
Learn what a file content inspector checks, read about hidden instructions in assignment files, or review the inspection methodology and limitations.
Before you submit or share a document
- Check for unexpected hidden text or instructions.
- Review comments, revisions, metadata, and document properties.
- Find concealed PDF text and questionable redaction layers.
- Inspect hidden Excel rows, columns, and worksheets.
- Identify zero-width characters and unusual Unicode controls.
- Export a report to document what was found.
Made with student life in mind
Useful before the deadline—and after questions come up
When using a provided file
Understand whether an assignment or reference document contains instructions that are not visible in its normal view.
When something is questioned
Preserve the original, export reviewable findings, and bring evidence—not assumptions—to the conversation.