Undetectable PDF Editing Web App
Budget: ₹12,500 – ₹37,500 INR
I’m building a browser-based PDF editor whose saved files show absolutely no trace of having been touched. The focus is text editing only, but with full control: users must be able to apply custom fonts, alter size and colour, add hyperlinks, even drop in scripts when the document already supports them.
The critical requirement is invisibility. After an edit, the PDF should pass Adobe Preflight, iLovePDF diff checks and similar validators; no “Modified” flags, incremental updates or stray metadata may remain. If the source file carries a digital signature, it must still open as “valid” in Acrobat or be automatically re-signed so no tamper warning appears.
You may work with any modern web stack—React, Vue, Svelte or plain JS on the front end—backed by a PDF engine such as PDFTron, pdf-lib, Apache PDFBox served over a lightweight API, or a WASM build if that offers cleaner binaries. I’m open to commercial SDKs if they help guarantee the undetectable result.
Core workflow I need:
1. Upload / drag-and-drop a PDF.
2. Enter text-edit mode, make in-place changes with the advanced toolbar.
3. Save / export, triggering a rebuild that strips revision history and preserves or recreates signatures.
Acceptance criteria
• Running a diff on the xref shows no incremental objects.
• Adobe Acrobat DC Preflight returns zero modification warnings.
• Page count, object ordering and encryption keys remain unchanged.
• Signed documents still display a “valid” signature badge.
Down the road I may want image or annotation editing, so please note how your architecture could accommodate those, yet keep this milestone strictly on text. In your proposal, outline the libraries or stack you prefer, how you’ll handle font embedding and signature preservation, and your estimated timeline to deliver a working prototype and a production-ready version.
The critical requirement is invisibility. After an edit, the PDF should pass Adobe Preflight, iLovePDF diff checks and similar validators; no “Modified” flags, incremental updates or stray metadata may remain. If the source file carries a digital signature, it must still open as “valid” in Acrobat or be automatically re-signed so no tamper warning appears.
You may work with any modern web stack—React, Vue, Svelte or plain JS on the front end—backed by a PDF engine such as PDFTron, pdf-lib, Apache PDFBox served over a lightweight API, or a WASM build if that offers cleaner binaries. I’m open to commercial SDKs if they help guarantee the undetectable result.
Core workflow I need:
1. Upload / drag-and-drop a PDF.
2. Enter text-edit mode, make in-place changes with the advanced toolbar.
3. Save / export, triggering a rebuild that strips revision history and preserves or recreates signatures.
Acceptance criteria
• Running a diff on the xref shows no incremental objects.
• Adobe Acrobat DC Preflight returns zero modification warnings.
• Page count, object ordering and encryption keys remain unchanged.
• Signed documents still display a “valid” signature badge.
Down the road I may want image or annotation editing, so please note how your architecture could accommodate those, yet keep this milestone strictly on text. In your proposal, outline the libraries or stack you prefer, how you’ll handle font embedding and signature preservation, and your estimated timeline to deliver a working prototype and a production-ready version.