Tamponner un PDF
protéger vos fichiers en ligne gratuitement. Traitement 100% local dans le navigateur. Aucun envoi serveur, confidentialité totale, sans inscription ni limite de taille.
- Free
- No Signup
- No Daily Limit
- Browser-Based
- No Server Upload
- Fast Processing
- Works on Mobile
Choose your workflow
Pick company seal or personal signature before uploading a PDF.
Select a workflow above to begin.
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How to stamp a PDF with red seals
Upload the PDF you need to stamp. Add photos of your round seal, title stamp, and signature — the tool removes paper backgrounds using red-ink extraction. Drag layers to align them, pick bottom-left or bottom-right placement, and choose the last page or all pages. Click Stamp PDF to embed the composite seal and download the file.
Everything runs locally in your browser. Contracts and company documents never leave your device.
Why choose SnapKit? Our tools are 100% Private, No Server Upload, Instant Browser-Based, with No File Size Limit.
When should you use this tool?
protéger vos fichiers en ligne gratuitement. Traitement 100% local dans le navigateur. Aucun envoi serveur, confidentialité totale, sans inscription ni limite de taille.
Is my data uploaded to the server?
No. SnapKit processes your files entirely in your browser using client-side WebAssembly, Canvas, and Web APIs. Your documents, images, and audio never leave your device, and we do not store uploads on our servers.
Pourquoi choisir SnapKit ?
Quatre promesses : confidentialité, vitesse, liberté et accessibilité.
100% privé — sans envoi
WebAssembly et Canvas sur votre appareil.
Vitesse instantanée
Pas d’attente réseau. CPU/GPU locaux.
Sans limite — gratuit
Sans filigrane ni compte.
Sur tous les appareils
iPhone, Android, Windows et Mac.
Frequently asked questions
How does red-ink extraction work?
The tool scans each pixel and keeps strong red ink while making paper backgrounds fully transparent — even gray or yellow tinted scans.
Can I stamp every page of a PDF?
Yes. Choose last page only for signature blocks or all pages for document-wide seals.
Is PDF stamping free and private?
Yes. Stamping is free with no account. Files are processed entirely in your browser with zero server upload.
Mes données sont-elles en sécurité avec cet outil ?
Oui. Tout est traité à 100% sur votre appareil via WebAssembly et les API du navigateur. Aucun envoi vers nos serveurs — confidentialité totale.
Pourquoi c’est si rapide ?
Parce que votre fichier ne quitte jamais le navigateur. SnapKit exploite directement le CPU/GPU local, sans upload ni téléchargement.