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• Whistle

Getting started

What can I do with Nelstack?

Work with images, PDFs and text, create bills, draw or type signatures, make stamps, use financial calculators, and manage bookmarks with Whistle. Choose a tool area below or use search to find a specific task.

Do I need an account or subscription?

No. The published tools are free to use without an account, subscription or added watermark. The contact form asks for an email so we can reply.

Are the tools only for India?

Image, PDF, signature and stamp tools are useful worldwide. Finance calculators, metal rates and bill formats focus on Indian rules and conventions. Check the assumptions shown by each calculator.

How do I find a specific task?

Search by what you want to do, such as compress an image, fill a PDF form, count words or convert HEIC to JPG. Image and PDF tool pages also group tasks by category and provide relevant next steps.

Working with files

Will my original file change?

Tools create a separate result for you to download. Keep your original and inspect the result before replacing or sharing it. Changing a signed PDF can invalidate its existing digital signatures.

Why might a file fail or exceed a limit?

Supported formats, file sizes, page counts and pixel limits differ by tool. Large documents also depend on available device memory. Read the displayed error, try a smaller batch, or split the file. Resolution reduction should be an explicit choice.

Why can conversion change the layout or quality?

Reflowing a PDF into an editable document can change fonts, tables and reading order. Rendering PDF pages turns text and vectors into pixels. Lossy image formats can discard detail. Review the output settings and retain the original when fidelity matters.

Does making PDF text non-selectable remove sensitive information?

No. Rasterizing turns pages into images, but OCR can recover visible text. Flattening makes forms or annotations static. Use Redact PDF to remove sensitive content and carefully review the exported document.

Support and trust

Where can I check how files and personal information are handled?

Read the Privacy policy and the information on the relevant tool page before using it. The policy also covers contact forms and analytics. Contact us if something is unclear.

Are calculator results, stamps or signatures officially certified?

Calculator results are estimates, not financial or legal advice. Generated stamp and signature images are design tools; they do not confer government approval, certification or a digital-signature certificate.

Practical walkthroughs

• Stamp Maker task guidesShort steps for designing, exporting and using stamps.
• Stamp Maker walkthroughsDetailed examples with layouts, images and export settings.
• Signature and PDF signing walkthroughsLearn to draw, type and place signatures on documents.

Each tool also includes its own instructions, limitations and common questions.

Still need help?

Tell us which tool you used, what you expected and the error you saw. Avoid sending sensitive documents or personal details.