How the tool works
Open a PDF, draw a signature with a mouse or touch or upload an image, select the target page, and drag and resize the signature before exporting.
Supported input and output
Uploaded signatures may be PNG, JPG, or WebP up to 10 MB and are embedded as a visual image. A transparent PNG generally produces the cleanest result.
Practical example
Draw your initials, select the approval page, place the mark above the signature line, resize it, and export a copy for review.
Common use cases
Add handwritten marks, initials, approval images, acknowledgements, or visual sign-offs to forms and documents when cryptographic certification is not required.
Limits and important checks
This tool creates a visual signature only. It does not verify identity, issue a certificate, provide tamper evidence, or create a cryptographic digital signature.
Privacy and local processing
Unless the tool explicitly identifies an external lookup, input and generated output are processed in your browser and are not uploaded to CosmoTools. Avoid placing secrets in any web page and review downloaded results before using them in production.
Frequently asked questions
Is this a certified digital signature?
No. The tool places a visual signature image in the PDF and does not create a cryptographic certificate.
Can I upload my signature?
Yes. You can draw with a mouse or touch, or upload a PNG, JPG, or WebP image.
Are the PDF and signature uploaded?
No. Both remain on your device and are combined locally in the browser.