Common Conversion and Calculator Mistakes

❌ Choosing H.265 for broad sharing

H.265 produces smaller files, but many older Android phones, smart TVs, and Firefox versions before 2023 cannot play it. ✅ Use H.264 when sharing with unknown audiences. Reserve H.265 for personal archives and controlled environments.

❌ Expecting a 500 MB video to compress to 16 MB without visible quality loss

Extreme compression always produces visible artifacts — blockiness, blurring, and lost detail. ✅ Trim unnecessary footage first. For sharing via messaging apps, keep videos under 1–2 minutes. If quality is critical, use a cloud sharing link instead.

❌ Using 'Best quality' for casual sharing

CRF 18 produces large files that waste storage and bandwidth without visible improvement for everyday viewing. ✅ CRF 23 ('Good quality') is visually lossless for most viewers and produces much smaller files.

❌ Saving photos as PNG

PNG is lossless and produces files 5–10× larger than JPG for photographic content. ✅ Use JPG or WebP for photos. Reserve PNG for logos, screenshots, and images needing transparency.

❌ Uploading full-resolution images to a website

A 4000px photo displayed in an 800px container wastes bandwidth and slows page load. ✅ Resize images to their actual display dimensions before uploading. A 1200px-wide image is sufficient for most web use.

❌ Repeatedly editing and re-saving JPG files

Each save at less than 100% quality compounds the quality loss — like photocopying a photocopy. ✅ Always keep a lossless master copy (PNG or TIFF). Only export to JPG as the final step.

❌ Running OCR on rotated or skewed images

Even a 5° tilt confuses line detection and dramatically reduces accuracy. ✅ Straighten images before uploading. Crop tightly to the text area.

❌ Expecting good results from handwriting

Tesseract OCR is designed for printed text, not handwriting. Cursive or connected writing produces unreliable output. ✅ Use clear, printed text. For handwriting, specialized ICR (Intelligent Character Recognition) software is needed.

❌ Saving document scans as JPG

JPG compression creates artifacts around text edges that confuse OCR engines. ✅ Scan documents as PNG or TIFF for OCR. These lossless formats preserve sharp character edges.

❌ Entering loan tenure in years instead of months

A 5-year loan entered as '5' instead of '60' produces drastically wrong EMI results. ✅ Always multiply years by 12. Double-check your inputs before relying on the output.

❌ Treating BMI as a medical diagnosis

BMI is a population screening tool — it does not distinguish between muscle and fat, account for body composition, or consider individual health factors. ✅ Use BMI as a starting point for conversation with a healthcare provider, not as a standalone health assessment.

❌ Overestimating activity level in calorie calculators

'Moderately active' means consistent exercise 3–5 days per week — not walking to the bus stop. Overestimating leads to overestimating calorie needs. ✅ Be honest about your activity level. If unsure, choose the lower option and adjust based on actual results over 2–4 weeks.

❌ Dividing by the new value when calculating percentage change

This is the single most common percentage error. Percentage change = (New − Old) ÷ Old × 100. ✅ Always divide by the original (old) value, never the new value.

❌ Forgetting that percentages compound, not add

A 20% increase followed by a 20% decrease does NOT return to the original. 100 → +20% → 120 → −20% → 96. Net change: −4%. ✅ Calculate multi-step percentage changes sequentially — never just add or subtract the percentages.

❌ Expecting audio extraction to improve quality

Extraction preserves the original audio exactly — it does not clean up noise, enhance clarity, or boost volume. ✅ If your source video has poor audio, improve it before extraction using audio editing software.

❌ Expecting complex Word formatting to survive Markdown conversion

Multi-column layouts, text wrapping around images, and tracked changes have no Markdown equivalent. ✅ Markdown is a plain-text format. Simplify your document structure before conversion, or use PDF output to preserve complex formatting.