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About Signature App
Electronic signatures and digital certificates allow to sign PNG document with eSign application. Note, the signed PNG document keeps signatures as supported document elements, such as text, labels, stickers, images, hidden metadata information and digital certificates that verifies document content. The PNG document signed with digital certificates could be verified for any changes of its content. If there were some changes made to signed document then verification process will detect it and certificates will be not valid. To add various electronic signatures, you need to select one or more PNG documents, then in application select one from the existing signature templates like Text Stamps, Images, Handwritten signatures, Barcode, QR Code or digital certificate to sign, drag the signatures across the document pages. The documents are stored in a secure storage. You can upload it from any platform, mobile or another device, on any Windows, MacOs, Linux or Android platform. We support any browser and provide generation of any digital signatures, metadata signatures or certificates. No registration is required. All files are processed on our servers so no additional plug-ins or software installations.
Protect document with digital signatures.
Support any document format as PDF, DOCX, XLSX, PPTX, RTF, ODS, OTS, ODP, JPEG, PNG, GIF, and many more!
Sign PDF documents with digital certificates and various electronic signatures.
Sign Microsoft and Open Office documents from browsers.
PNG, Portable Network Graphics, refers to a type of raster image file format that use loseless compression. This file format was created as a replacement of Graphics Interchange Format (GIF) and has no copyright limitations. However, PNG file format does not support animations. PNG file format supports loseless image compression that makes it popular among its users. With the passage of time, PNG has evolved as one of the mostly used image file format.
For signing your PNG document first select sign type (Digital, Text, Barcode, Image, Stamp, QR-code).
Step3
Сlick 'Sign document and download result' button.
Step4
Get your signed document from browser downloads.
FAQ
Questions & Answers
What is digital signature?
The digital signature is an electronic artifact on the document which could be a simple document element like a text, stamp, image or could be a more complicated digital certificate that verifies the document signer and checks that document data was not changed after its signing.
How to create a digital signature?
Once you will upload the document from this page, you will be redirected to the document editor where you will need to pick the signature type that could be text, image, stamp, barcode, QR code or digital certificate. When the signature type is selected you can click [Add] button to create a new digital signature of the proper type. Text signature requires only text and adjusting its style. Image signature requires the image to be uploaded. Barcode or QR code signature requires text. The digital certificate will need a special pfx certificate file to create the documen signature.
How to sign a PNG document?
The document could be signed with many electronic signatures of the different types. The signatures could be added to the document page and then could be saved. Some documents support only simple electronic elements like text and images. Many documents formats support digital certificates that allow protecting content from unexpected changes.
How to add signature?
Simple digital signatures, like text and images, could be located on the document page to provide a visual signature confirmation. When the document was uploaded to the editor the signatures from the toolbox could be dragged to the document page and pointed to a specific area. The digital certificate could have no visual representation but be embedded into the document and protect it from unexpected changes.
How to verify a signature in PNG document?
The digital signature on the document could be verified visually or automatically. Visual verification is efficient for text, stamps, handwritten signatures, watermarks. The automatic verification could tell hidden information about the document signer and protect the document from unexpected changes. The Barcode and QR code signatures allow automate document verification process. Digital certificates could protect highly important documents from unauthorized changes.
Other Signature file formats
You can also sign other file formats. Please see the list below.
{"STEP1_PUTS":"1. Put signatures:","STEP2_SIGN":"2. Sign and download:","STEP3_EXIT":"Exit:","Sign_Bar_Name":"Barcodes","Sign_Bar_Title":"New Barcode","Sign_Dig_Name":"Digital Certificates (.pfx)","Sign_Dig_Title":"New digital signature","Sign_Hand_Name":"Handwritten signatures","Sign_Hand_Title":"","Sign_Image_Name":"Image signatures","Sign_Image_Title":"Add image signature","Sign_Qr_Name":"QR-codes","Sign_Qr_Title":"New QR-code","Sign_Stamp_Name":"Stamps","Sign_Stamp_Title":"","Sign_Text_Name":"Text signatures","Sign_Text_Title":"","ListPanel_Apply":"Apply","ListPanel_NoEntries":"There is no entries yet","Sign_Text_Default":"Signed","UI_Text_Click_Or_Drop":"Click [split] to open [file] [split] or drop it here","UI_Text_Certificate":"a certificate","UI_Text_Image":"an image","UI_Text_File":"a file","URL_SignDocument":"https://products.groupdocs.app/signature/sign/","URL_FileUpload":"https://products.groupdocs.app/api/signature/upload","URL_SignWithGeneratedImage":"https://products.groupdocs.app/api/signature/signwithgeneratedimage","URL_Total":"/signature/total","URL_Host":"http://products.groupdocs.app","MSG_FailedToUploadFile":"Failed to upload file. Reason:","MSG_SelectFileUpload":"Please select a file to upload.","MSG_SelectFileToSign":"Please select one file to sign.","MSG_UnsupportedType":"You are trying to upload file(s) of unsupported type: ","MSG_DropSelectFileToSign":"Drop or select your file to sign","MSG_Processing":"PROCESSING","AllowedExtensions":"\"png\"","ImageExtensions":".bmp,.gif,.jpg,.jpeg,.png,.webp","CertificateExtensions":".pfx","Sign_Bar_Panel_Tooltip":"Add Barcode","Sign_Dig_Panel_Tooltip":"Protect with digital certificate","Sign_Hand_Panel_Tooltip":"Add handwritten signature","Sign_Image_Panel_Tooltip":"Add Image signature","Sign_Qr_Panel_Tooltip":"Add QR-code","Sign_Stamp_Panel_Tooltip":"Add Stamp","Sign_Text_Panel_Tooltip":"Add Text signature","Sign_Add_New_Tooltip":"Create new signature","Sign_Drag_Tooltip":"Drag me to the page or click","Tutorial_Tooltip":"Tutorial","STEP2_SIGN_Tooltip":"Sign document and download result","STEP3_EXIT_Tooltip":"Close editor","Sign_Hand_Color":"Color","Sign_Hand_Width":"Width"}
