CalcLockChoose text that stays readable
Enter a short name, label or usage note. Adjust font size, color, opacity and placement while looking at the preview. Font size and edge padding use original-image pixels, so the same number looks different on a small screenshot and a large photo. The tool refuses text that would not fit within the selected padding.
Leave enough contrast and breathing room
White text can disappear against a bright sky; dark text can disappear against shadows. Try another color or position rather than assuming a watermark is readable because the settings are valid. The system sans-serif font and glyph shapes can vary across devices. Check unusual characters and emoji in the downloaded file.
Export a flattened copy
The PNG contains the text as pixels, not an editable text layer. Your original is unchanged. The preview updates as you edit; regenerate after any change to get a matching download. PNG can be larger than the original JPEG. Use the JPEG compressor afterward if file size matters, then check that the text remains legible.
A visible label is not copy protection
A watermark can communicate attribution or context, but it does not establish ownership, register copyright, prevent copying or guarantee that the mark cannot be removed. This tool does not add invisible tracking, a digital signature or a provenance credential.
Local processing and practical limits
These browser utilities are separate from the CalcLock iPhone vault. Choosing a photo here does not import it into the app. The tool code processes your selection in this browser, with no image upload, remote processing service or browser-storage persistence. Downloads are saved wherever your browser normally places them.
Inputs must be browser-decodable PNG, JPEG or WebP, up to 25 MB, 24 million pixels and 10,000 pixels per side. A device may run out of memory below these limits. HEIC, GIF, SVG and AVIF are not supported inputs. Animated PNG or WebP is treated as a browser-decoded still frame, not preserved as an animation.
Crop and watermark exports are newly encoded PNG copies. They do not copy original EXIF fields, but that statement applies only to the generated copy. It does not remove information from originals, backups or other shared files, and it does not make the visible image anonymous. Browser encoding may add its own information. The inspector only reads the image and creates a text report; it does not re-encode or strip the selected photo.
Clear removes the current preview, settings and download link, and releases the tool’s object URLs. It does not securely erase device memory or delete downloaded files. Review all downloaded results before sharing or replacing anything.