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PDF Watermark

PDF Watermark — Free Online

PDF par watermark जोड़ें — Diagonal / Center / Corners position, opacity slider, font size, color। Confidential, Draft, Sample जैसे text marking ke liye।

PDF file select करें

Max recommended: 50 MB

100% Private — browser में process होता है, कोई upload नहीं।
Standard ASCII watermark text supported (Devanagari watermark के लिए image-watermark feature future में add होगा)।

कैसे Use करें?

  1. 1PDF file upload करें — pages count auto-detect
  2. 2Watermark text टाइप — default 'CONFIDENTIAL' (max 50 chars, ASCII)
  3. 3Position select — Diagonal, Center, या 4 corners
  4. 4Color choose — Grey, Red, Black, Blue
  5. 5Font size 12-120pt slider
  6. 6Opacity 10-100% slider — 30% default
  7. 7'Watermark लगाएं' दबाएं — pdf-lib हर page पर text add
  8. 8Download — file naming: 'watermark-{original}.pdf'

PDF Watermark क्या है?

## PDF Watermark kya hai PDF Watermark tool हर page पर text overlay (e.g. 'CONFIDENTIAL', 'DRAFT', 'SAMPLE') add करता है — semi-transparent layer, content readable रहता है but watermark prominent। Use cases: Confidentiality marker (internal documents, legal drafts, NDAs), Version control (DRAFT/FINAL/REVIEW), Branding/copyright, Anti-piracy (paid courses/eBooks), Legal trace (recipient name embed leak detection)। Browser-based, pdf-lib library — कोई upload नहीं, position + opacity + size + color customizable। ## Kaise kaam karta hai PDF ArrayBuffer में read → pdf-lib parse → standard font (Helvetica Bold) embed (currently ASCII only) → हर page पर loop → page dimensions → text width calculate → position based x, y compute (Diagonal — center + 45° rotation; Center — exact center; Corners — margins from edges) → page.drawText() API (color RGB 0-1, opacity 0-1, rotation) → save → Blob → download। Performance: 100-page 1-3 sec। Limitations: ASCII text only (Devanagari future), image watermarks नहीं, per-page customization नहीं। ## 5 use cases **1. Legal contract draft**: 'DRAFT - NOT FOR EXECUTION'। **2. Confidential business document**: 'CONFIDENTIAL' diagonal pitch deck। **3. Sample chapter for sale**: 'SAMPLE - BUY FULL EDITION'। **4. Internal company memo**: 'INTERNAL USE ONLY'। **5. Watermarked receipts**: 'PAID' / 'COPY' indicator। ## Common mistakes **1. Devanagari text type karna**: ASCII only currently — workaround Hinglish। **2. Opacity 100%**: content unreadable — 25-40% sweet spot। **3. Font size too large/small**: 36-72pt good range। **4. Watermark color content से similar**: black + black blend — Red/Grey better। **5. Diagonal hamesha best mat samjhें**: tabular reports में footer better। ## Pro tips for watermarking **1. Diagonal + 30% + 60pt standard 'CONFIDENTIAL' look। **2. High contrast। **3. ALL CAPS convention। **4. Short text (8-15 chars)। **5. Test 1-page sample first। **6. Footer position legal disclaimer के लिए। **7. Recipient-specific anti-piracy। **8. Removable — tamper-resistance के लिए digitally signed + hashed PDFs। ## Modern context — 2026 mein document protection 2026 multilayered: invisible watermarks (steganography), dynamic (DocuSign), blockchain provenance, DRM integration (Adobe LiveCycle), AI-generated content tagging। India: govt documents (income tax, PF, Aadhaar) सब watermarked, private sector standard practice। हमारा tool basic visible — most use cases sufficient। 12MBC combo में document management।

Formula / तरीका

Position math (PDF coords origin bottom-left): Diagonal — x = (pageWidth/2) - (textWidth/2), y = (pageHeight/2) - (textHeight/2), rotation = 45°. Center — same x, y, no rotation. Top-left — x = 36, y = pageHeight - textHeight - 36. Bottom-right — x = pageWidth - textWidth - 36, y = 36. Color RGB normalized 0-1. Opacity 0-1.

Tips और सुझाव

  • •Diagonal + 30% opacity + 60pt = standard look
  • •ALL CAPS convention
  • •High contrast — light document → dark watermark
  • •Short text (8-15 chars) ideal
  • •Currently sirf ASCII / Latin support
  • •Tabular reports में diagonal distracting — footer better
  • •Test 1-page sample पहले
  • •Recipient-specific watermarks anti-piracy

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अक्सर पूछे जाने वाले सवाल (FAQ)

Devanagari (Hindi) watermark add ho sakta hai?
Currently नहीं — Latin/ASCII only। Devanagari render के लिए special font + text shaping (conjuncts, vowel marks) चाहिए, future enhancement। Workarounds: Hinglish — 'GOPNIYA', 'NIJI'। English equivalents — 'CONFIDENTIAL', 'DRAFT'। Devanagari urgent — Adobe Acrobat (paid)। Photopea में text layer Devanagari font।
Image watermark (logo) add ho sakta hai?
Currently नहीं — text only। Image watermarking future enhancement। Why text first: most common use case, smaller file size impact, simpler implementation। Image watermark abhi: Adobe Acrobat — Add Watermark → File option। Photopea page-by-page। iLovePDF/Smallpdf (file upload privacy concern)। pdftk/ImageMagick + ghostscript। Workaround: image logo को text representation में।
Watermark hatana possible hai?
हमारा watermark content stream embedded text। Removal options: Acrobat Redact (white rectangle cover), Acrobat Edit Text (identify + delete possible), Print to new PDF (visible रहेगा), OCR re-extract (labor-intensive)। Determined attacker remove कर सकता है — watermark casual/good-faith communication के लिए। Tamper-resistant: digitally signed + hashed PDFs। 95% legitimate use cases sufficient deterrent।
Multiple PDFs par ek saath watermark?
Currently single-file। Future batch। 5-10 PDFs: एक-एक। 50+: Adobe Action Wizard, pdftk `pdftk source.pdf stamp watermark.pdf output stamped.pdf` bash loop, PyPDF2/pikepdf scripts। हमारा tool 1-5 PDFs में sweet spot।
Watermark sirf pehle page par lagana hai?
Currently uniform sab pages पर। Workaround: PDF Split selected pages → watermark apply → PDF Merge बाकी के साथ। Example: 100-page eBook, sirf pages 5-10 → split 5-10 → watermark on sample.pdf → merge: 1-4 + sample-watermarked + 11-100। For frequent: Adobe Acrobat Add Watermark → page range option।
Output watermark print mein bhi aati hai?
हाँ — content stream embedded, pages का intrinsic part। Print, screen, mobile, Kindle, Save As सब में visible। Test: different viewers में open करें। Adobe Acrobat के 'Don't Print' watermark feature से अलग — हम simple visible only। Why embed: cross-platform reliable, tamper resistance higher, print जरूरी use case।
Privacy safe? PDF upload toh nahi hoti?
100% client-side, कोई upload नहीं। Pure browser-based: FileReader → memory → pdf-lib parse + modify (CPU पर) → Blob → download। कोई network call PDF bytes के साथ नहीं। Verify: DevTools Network tab। WiFi off करके भी काम। Comparable tools (iLovePDF, Smallpdf) — सब servers पर upload — privacy compromise।
Encrypted ya restricted PDFs par watermark lag sakta hai?
Owner-restricted (print/copy/edit blocked but viewable): हाँ — ignoreEncryption: true से load, watermark add, save। User-password protected: नहीं — content encrypted। Workaround: पहले PDF Unlock tool से (या qpdf से original password use करके) decrypt, फिर watermark। हमारा tool एक-step में दोनों कर देता है (restrictions removed + watermark added)।

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