filehugger.comScanned PDF to Searchable PDF
Render scanned pages, recognise supported Western-European text locally and add an invisible searchable text layer to a new PDF.
Analyse your own file
Choose a Scanned PDF or image file
Drop it here or browse this device
Your original file is analysed in this browser and is not uploaded. This tool has no AI or server-processing step.
What happens to the file
- Default processing
- Browser-only JavaScript, PDF.js, pdf-lib and Tesseract where the task needs them
- Accepted input
- Scanned PDF or image
- Report contract
- File Intelligence JSON schema 1.0 plus a flattened CSV view
- Optional AI
- Not used by this tool
The synthetic scan contains an invoice number, date and total. The output verification must find extracted characters after the PDF is rebuilt.
How the result is calculated
The source is rendered in the browser, Tesseract recognises each page at a bounded resolution, and pdf-lib writes a fresh PDF containing the rendered page plus an invisible text layer. The source pixels remain visible; text coordinates are approximate in version 1.0.
OCR confidence is the mean confidence reported for recognised blocks when available. Searchability is verified by reopening the output and extracting text. The report never converts OCR confidence into factual certainty.
Supported and unsupported cases
| Input or situation | What version 1.0.0 checks | What it does not claim |
|---|---|---|
| Printed English | Local Tesseract language data | Handwriting or specialist notation |
| Characters outside the built-in PDF font | Conversion stops with a clear error instead of replacing letters | Unicode searchable layer in this version |
| PDF scans | Page-by-page rendering and rebuilt searchable PDF | Password-protected sources without credentials |
| PNG/JPEG/SVG scan | Single-page searchable PDF | Exact original vector or colour-profile preservation |
What the confidence score means
Confidence describes how much of the file the published parser could inspect and how specific the evidence was. It is deliberately separate from the result score. A 95/100 confidence value does not mean “95% likely to be true,” and a high health/readiness score does not certify safety, compliance or factual correctness.
Comparison with other approaches
| Approach | Useful strength | Important limitation |
|---|---|---|
| Local OCR PDF | No upload, searchable output and word-coverage verification | English recognition; characters outside the PDF font are rejected |
| Plain OCR-to-text | Small and easy to edit | Loses the page image and visual context |
| Commercial layout OCR | Often better coordinates and tables | May require upload, account or payment |
| Manual transcription | Best for short critical records after review | Slow and prone to typing errors |
3/3 fixtures passed (100%)
Dataset: FH-INT-SYNTH-2026-07. Scope: Synthetic scan render, local OCR completion and output text re-extraction. Fixtures contain generated data only; no visitor file or personal record is collected.
When this result can be wrong
OCR can confuse 0/O, 1/l, punctuation, names and totals. Approximate invisible text placement may make selection awkward. The output is useful for search and copy, but is not a faithful tagged-PDF reconstruction.
Keep the original file, test the output in the receiving application and escalate high-stakes legal, financial, medical, accessibility or security decisions to a qualified reviewer.
Version and accuracy change log
| Release | Date | Calculation/coverage change | Re-test requirement |
|---|---|---|---|
| 1.0.0 | 2026-07-29 | Initial public engine, report schema, thresholds, synthetic fixtures and sample files. | All published fixtures and one browser sample per tool. |
Downloadable evidence, not a black-box verdict
After analysis, use Download JSON report for structured evidence or Download CSV report for review in a spreadsheet. Both include engine version, timestamp, score, confidence, metrics, findings, recommendations and limitations. Sensitive-data reports mask candidate values and no report includes the complete extracted document text.
Related tools and independent checks
Method or accuracy correction? Read the testing methodology and contact info@brothers.net.tr. Material scoring changes are published in the change log.