Extrair Assinaturas
Extraia assinaturas e carimbos de digitalizações, removendo o fundo para gerar arquivos PNG transparentes.
Enviar foto do contrato com assinatura ou carimbo
Sobre esta ferramenta
The Signature & Stamp Chroma Ink Optimizer functions as a professional high-fidelity ink purifier.
Signatures or corporate seals captured on phones often suffer from yellow paper tint, uneven shadows, and page wrinkles. Pasting them directly onto contract PDFs looks amateur.
This tool separates the Alpha channel based on luminance and color space. It completely bleaches paper backgrounds while sharpening stamp red (Chroma Ink) and handwriting black. The result is a premium, transparent PNG stamp carrying genuine ink textures.
Practical guidance before you use Extrair Assinaturas
Best for real document workflows
Use Extrair Assinaturas when you need a quick browser-based result without creating an account or sending routine documents through an unnecessary upload workflow. Professional e-signature prep is a common example: Convert gray signature photos into beautiful, transparent layers to sign agreements.
Privacy and file handling
EasyPDFNex prioritizes local processing in your browser. That means supported PDF operations run on your device, not in a public cloud queue. For sensitive files, review the output before sharing it, close the browser tab after downloading, and avoid processing documents you are not authorized to edit.
Quality checks after processing
After you download clean signature, open the result and check page order, text readability, signatures, links, and form fields. If the source file is scanned, encrypted, very large, or damaged, try a related workflow such as sign pdf, image to pdf, edit pdf before repeating the task.
Start with a clean source file whenever possible. For Extrair Assinaturas, the first step is usually "Upload seal photo": Provide a phone-captured photo of your signature or stamp seal. This simple preparation step prevents most failed exports, missing pages, and formatting surprises.
Editorial review note
This guidance is maintained by the EasyPDFNex editorial team and reviewed for practical PDF workflow accuracy. Tool pages are written to explain when a feature is useful, what to check before download, and where browser-based processing has limits.
Como usar
Upload seal photo
Provide a phone-captured photo of your signature or stamp seal.
Adjust cleaning sliders
Move contrast and luminance sliders to isolate the background noise in real-time.
Download clean signature
Export as transparent PNG ready to be stamped onto formal document agreements.
Casos de uso
Professional e-signature prep
Convert gray signature photos into beautiful, transparent layers to sign agreements.
Corporate seal sanitizing
Clean physical stamp scans by discarding paper fiber noise, preparing crisp transparent stamp seals.
Drawn line art extraction
Isolate black strokes from drawing sketchbooks for easy Photoshop coloring workflows.
Perguntas frequentes
How does self-adaptive Alpha extraction differ from normal keying?
Standard chroma-keying often makes signature stroke details look blocky and pixelated. Our algorithm isolates only white/yellow background noise and smooths the ink borders.
Which image formats are supported?
We support JPG, JPEG, and PNG. For best results, capture your signature photo under bright, even lighting.
Will the handwriting detail be modified?
No. The pixel filtering acts on original coordinates, sharpening contrast while maintaining genuine stroke textures.