How to use free tools

How to Use Tchers’ Den Tools

• PDF → JPEG Converter
• Image Converter
• PDF Splitter / Merger
• QR Code Generator & Scanner
• Unit Converter
• Markdown → HTML Previewer

PDF → JPEG Converter Client‑side

1. Open the tool page: (add URL).
2. Click Choose PDF (or drag & drop a PDF).
3. Set DPI/Quality if available; pick page range if needed.
4. Click Convert → previews appear.
5. Use Download for single images or ZIP All to save everything.

Tip: Higher DPI = larger image file but sharper text. All work happens in your browser.

Image Converter (PNG ⇆ JPG ⇆ WebP) Batch • Resize • ZIP

1. Open: (add URL).
2. Click Choose Images or drop files (PNG/JPG/WebP).
3. Select output Format (JPG/PNG/WebP), set Quality (JPG/WebP), Scale, and (for JPG) Background color.
4. Thumbnails appear; click Download per image or Download All (ZIP).

If WebP isn’t supported by the browser, it falls back to PNG automatically.

PDF Splitter / Merger Extract • Reorder • Merge

Split pages

1. Open: (add URL).
2. Choose a PDF; type Ranges like 1-3,5,8 or click page numbers.
3. Click Extract → PDF or Split Into Single‑Page ZIP.

Merge PDFs

1. Go to the Merge tab; click Add PDFs.
2. Reorder with ▲/▼; remove unwanted files.
3. Click Merge → PDF and save the result.

Everything runs locally using PDF‑LIB / JSZip / FileSaver.

QR Code Generator & Scanner Generate • Camera Scan • Image Scan

Generate a QR

1. Open: (add URL).
2. Type/paste text or URL. Adjust Size, ECC, Margin, and colors.
3. Click Generate → Download PNG.

Scan with camera

1. Switch to Scan tab → select a camera → Start.
2. Allow camera permission (requires HTTPS).
3. Hold the QR in the frame; result appears. Use Copy.

Scan from an image

1. Click Scan from Image and choose a photo/screenshot.

Works fully offline after load. On iOS Safari, camera needs a user action and HTTPS.

Unit Converter (Length, Mass, Area, Volume, Speed, Time, Temperature) Quick picks • Copy result

1. Open: (add URL).
2. Choose a Category and set From/To units. Enter a value.
3. Click Convert or use the Quick Picks buttons.
4. Use Copy to copy the result; adjust Precision as needed.

All math uses precise SI factors; temperature uses exact formulas.

Markdown → HTML Previewer Live • Sanitized • Copy/Download

1. Open: (add URL).
2. Type or paste Markdown on the left. Pick options (GFM/CommonMark, line breaks, smart quotes).
3. Copy the HTML or click Download .html.
4. Open a .md file via Open .md to preview instantly.

Preview HTML is sanitized with DOMPurify for safety.

Note: Replace each “(add URL)” with your live tool link. You can also set them below in one place using data attributes.