Your browser can do more than display pages.
When you type into the Percentage Calculator or Word Counter, the code running on your device computes the result. No external calculation service is needed. The page still had to be downloaded from a server, but the numbers or text you enter are not sent back by these tools.
Choosing a file is different from uploading it.
A browser file picker gives a page access to the file you choose. A file upload happens only if that page transmits it. Tool Fera’s available image tools use a canvas in a background worker when supported to decode and process the selected image locally, then create a new download.
The original file is unchanged. The result can have different quality, dimensions and format. JPEG and BMP fill transparency with white; PNG, WebP and AVIF can retain it. Review the preview and compare the displayed sizes before downloading.
What favorites and history remember
Tool Fera stores tool identifiers in localStorage so you can return to useful tools. That list can say you used the GPA Calculator; it does not contain the grade points or credits you entered. It does not contain your text, image files or generated passwords either.
LocalStorage belongs to the browser profile on that device. It does not sync across devices. Other people using the same profile may see the list. You can clear it using the homepage’s saved-history control or through browser settings.
Local processing still has practical limits.
Large images use memory and may take longer on older phones. JPEG compression may increase the size of an image that was already optimized. JavaScript JSON parsing can lose precision for unusually large integers. These are reasons to review results, even when a tool runs locally.
Check the processing statement for each tool.
The current processing tools run on your device; website pages and processing assets still load from the hosting platform. PDF editing and structural compression run in a worker; PDF-to-image rendering uses PDF.js on your device. Optional image-based compression removes searchable text, links and forms, so its interface explains that tradeoff. PDF to Word reconstructs editable text, headings, supported images and simple tables locally. Complex layouts can differ. PDF to Word does not use OCR for selectable text. Scanned PDF and image text extraction belong to the separate OCR tools, which use a Tesseract.js worker and process PDF pages one at a time. Word to PDF creates a selectable-text PDF from supported DOCX content in a worker. OCR and document fonts load only when needed. A statement about one tool does not automatically apply to another.
Try the Image Resizer, explore text tools, or read the Privacy Policy for the website’s current practices.