Core Sign

private. essential. Core...

The reader is free forever, and saving, exporting, printing, and sharing your file are never locked. The advanced tools are a one-time unlock ($9.99 in the U.S.; local prices vary), with no account and no renewals.

Import a PDF as a Copy or a Link:
• Copy: Core Sign keeps its own copy, and your original is never changed.
• Link: opens your original where it is. It changes only if you choose Overwrite original, and is deleted only if you choose Delete from device.

Free:
• Read, Save, Split, Export, Print, and Share PDFs
• Import a PDF or a Photo
• Copy Text
• Folders in your own colors, with Move to folder and folder import

One-time unlock:
• Fill Forms, Sign, and Initial
• Highlight with Word Snapping, and Redaction, burned in on export so the hidden text is gone from the saved file
• Markup
• Merge and Page Edits
• Encrypted Vault for your signatures and private documents, kept locally on your device: AES-256-GCM, with the key held in the Android Keystore and unlocked by your PIN, pattern, or biometrics

• Tablet Support: runs on Android phones and tablets.

Works offline. No third‑party ads. No account. No cloud. No AI inside.

About electronic signatures:
Core Sign places your signature on a PDF on your device. Whether an electronic signature is accepted as official depends on the recipient and on the law where you live. Some documents, such as wills, trusts, and some family-law or notarized papers, may require a handwritten or certified signature. Core Sign does not create EU "qualified" electronic signatures. If you're unsure, ask the person or office receiving the document.