User Guide
New here? These step-by-step guides will help you get the most out of every free tool on niDar Tools.
🖼️ Image Resizer & Compressor
Resize a photo to an exact size and file size — great for passport/ID photos.
- Open Image Resizer and upload your photo.
- Choose a unit (px/cm/mm/in) and enter your target width and height.
- Turn off "Maintain aspect ratio" if you need an exact custom size (like 3.5×4.5 cm for a passport photo) that's different from your photo's original shape.
- Set your target file size (KB/MB) and pick the output format (JPEG or PNG).
- Optional: turn on "Add a solid background" to fill empty space with a colour, or "Smart Background Change (AI)" to replace the real background behind a person.
- Tap Resize & Compress, then Download File.
🔄 Image Format Converter
Convert images between JPG, PNG, and WebP formats directly in your browser.
- Open Image Format Converter and select an image from your device.
- Choose the output format: JPG, PNG, or WebP.
- Tap Convert to convert the image in your browser.
- Check the converted file size shown in the result section.
- Tap Download File to save the converted image.
Privacy: Your image is processed locally in your browser and is not uploaded to a server.
📄 Image to PDF Converter
Combine one or more photos into a single PDF file.
- Open Image to PDF and upload one or more photos.
- Use the ▲ ▼ buttons to reorder the photos — this is the order they'll appear in the PDF.
- Choose page size (A4 / Letter / Fit to Image), orientation, and margin.
- Tap Generate PDF, then Download PDF.
🎂 Age Calculator
Find your exact age in years, months and days.
- Open Age Calculator.
- Enter your date of birth.
- (Optional) Change the "To Date" field if you want your age as of a different date.
- Tap Calculate Age to see your exact age, total days/weeks/months, and days left to your next birthday.
🔳 QR Code Generator
Create a QR code for any link or text.
- Open QR Generator.
- Type or paste your link/text.
- Choose a size and colour.
- Tap Generate QR Code, then Download PNG.
- To test it: open a camera app on another phone and point it at the QR code, or use Google Lens on the downloaded image.
🧩 Favicon & Icon Kit Generator
Turn one logo/image into a complete website icon set.
- Open Icon Kit Generator and upload your logo.
- If your logo has a plain/solid background you want removed, turn on "Remove background".
- Tap Generate Icon Kit.
- Tap Download ZIP — it includes favicon.ico and all standard icon sizes, ready to use on any website.
🪄 Background Remover
Remove the background from any photo instantly, free, with no watermark.
- Open Background Remover and upload your photo.
- Wait a few seconds while the tool processes the image in your browser (first use may take slightly longer as the AI model loads).
- Compare the original and background-removed preview side by side.
- Tap Download PNG to save your image with a transparent background.
Privacy: Your photo is processed locally in your browser using on-device AI — it is never uploaded to a server.
📃 Word to PDF Converter
Convert a Word (.docx) document into a PDF file.
- Open Word to PDF and upload your .docx file.
- Wait a few seconds while the tool renders a preview in your browser.
- Review the preview carefully — check headings, paragraphs, and any tables.
- Tap Download PDF to save the converted file.
Note: Only .docx files are supported. If you have an older .doc file, re-save it as .docx in Word first.
📝 PDF to Word Converter
Convert a PDF file into an editable Word (.docx) document.
- Open PDF to Word and upload your PDF file.
- Wait a few seconds while the text is extracted and shown in a preview.
- Review the extracted text — this tool converts text content, not exact layout.
- Tap Download Word (.docx) to save the file.
Note: This works best with text-based PDFs. Scanned PDFs (images of text) will not convert accurately.
Need more help?
Check our FAQ page, or reach out any time at [email protected].