Documentation

Welcome to the official Covertfily documentation. Covertfily is a suite of professional-grade file tools designed to work entirely in your browser. No servers, no uploads, just pure privacy.

Pro Tip: You can use Covertfily offline. Once the page is loaded, you can disconnect your internet and all tools will continue to function.

Key Philosophy

100% Local

Processing happens in your device's RAM, never on our servers.

Instant

No waiting for uploads or downloads from a cloud server.

Open Source

Transparent code that anyone can audit and improve.

Privacy & Security

Most online converters require you to upload your sensitive documents to their servers. This creates a massive security risk. Covertfily solves this using Client-Side Processing.

How it works:

1

File Selection

When you select a file, the browser creates a local "File Object" or "Blob".

2

Local Logic

Our JavaScript libraries (like PDF.js, SheetJS, or custom WebAssembly modules) read the file data directly from your memory.

3

Local Generation

The new file is generated locally and presented as a download link. Your original data never leaves your browser.

File Conversion

Covertfily supports bidirectional conversion for over 100+ file formats including Images, Documents, Audio, and Video.

How to convert files:

1

Select Input Format

Use the "From" dropdown on the homepage to select your file type (e.g., PNG).

2

Select Output Format

Choose your target format (e.g., JPG). Our system only shows compatible formats.

3

Upload & Download

Click "Upload & Convert". Once the processing completes (usually instant), a download button will appear.

Batch Processing: You can drag multiple files at once. For PDF output, they will be automatically merged into a single document.

PDF Power Tools

Professional PDF management without the cloud subscription.

Merge PDF

Combine multiple PDFs or Images into a single document. Drag and drop to reorder.

Compress PDF

Reduce file size by optimizing internal PDF structures and image quality.

Watermark PDF

Add text or image watermarks to protect your intellectual property.

Tutorial: Merging PDFs

1

Navigate to Merge PDF

Go to the Tools menu and select "Merge PDF".

2

Add Files

Drop all the PDFs you want to combine into the dropzone.

3

Generate

Click "Merge & Download". The files are concatenated locally.

Image Processing

A complete suite for image manipulation and optimization.

Advanced Image Tools:

  • Image Resizer: Scale images while maintaining aspect ratio or force specific dimensions.
  • Face Blur: Automatic privacy tool that blurs faces using browser-based AI/Vision detection.
  • Mosaic & Blur: Manually obscure sensitive parts of an image.
  • OCR (Image to Text): Extract text from images using Tesseract.js directly in your browser.

Tutorial: Extracting Text (OCR)

1. Select "OCR (Image to Text)" from the tools menu.
2. Upload a clear image containing text (JPG/PNG).
3. Wait for the processing bar to complete.
4. Copy the extracted text or download it as a .txt file.

Data Extraction

Tools for developers and power users to inspect and extract metadata.

EXIF Reader

Extract GPS coordinates, camera settings, and timestamps from photos.

Color Palette

Automatically extract the dominant color scheme from any image.

Image to Base64

Convert images to DataURI strings for embedding in CSS or HTML.

Privacy & Security Tools

Advanced tools for securing and hiding information.

Steganography

Hide secret text messages inside an image file without changing its appearance. The message is encrypted and encoded into the least significant bits of the image data.

How to use:

1. Upload a "Carrier Image".
2. Type your secret message and set an optional password.
3. Download the encoded image. It looks identical to the original!
4. To decode, upload the encoded image back to the Steganography tool.