Tool guides

Learn what to check before creating a QR code for a website, flyer, menu, poster, or business card.

A practical checklist for reducing image file size while keeping pages sharp and usable.

Understand when to use SRT or WebVTT, and how to convert subtitle files for different platforms.

Learn how subtitle timing drift happens and how to shift captions back into place.

A simple guide to EXIF, GPS, camera, software, and text metadata in images.

Fix broken characters by converting text or subtitle files to UTF-8 encoding.

Make JSON easier to read, validate, and copy while debugging APIs or config files.

Understand how GST inclusive and exclusive amounts work before calculating tax values.

Resize images for social platforms without stretching, cropping important details, or creating oversized files.

Create a menu QR code that is easy for customers to scan from tables, posters, flyers, or receipts.

Understand what Base64 is, when to decode it, and what to check before using decoded output.

Learn what makes a password stronger and how to choose length, symbols, numbers, and casing.

Calculate age in years, months, days, and total days for birthdays, forms, records, and planning.

Write search result descriptions that are clear, specific, and useful for visitors.

Understand sitemap lines, allow rules, disallow rules, and common robots.txt mistakes.

Create hashtag sets that match the topic, platform, audience, and post style.

Generate username ideas that are readable, memorable, available, and suitable for profiles or projects.

Remove messy subtitle formatting, speaker clutter, SDH notes, and spacing issues before sharing captions.

Extract readable text from subtitle files for notes, articles, summaries, and republishing workflows.

Compare JPEG, PNG, and WebP for photos, screenshots, transparency, file size, and website performance.

Understand why Base64 is useful for transport but should not be treated as secure encryption.

Fix QR codes that are too small, too low contrast, damaged, crowded, or pointing to a broken destination.

Learn when to resize image dimensions and when to compress file size for faster uploads and cleaner pages.

Compare page titles and meta descriptions so search snippets are clearer and more clickable.

Understand the difference between blocking crawlers with robots.txt and asking search engines not to index a page.

Extract readable text from EPUB ebooks for notes, summaries, research, and editing, with automatic character-encoding detection.

Open EPUB files online and read them with their original formatting, browse chapters from the table of contents, or extract plain text.

Turn plain text into a multi-chapter EPUB ebook with chapter titles, a cover image, optional Markdown formatting, and a built-in table of contents.

Combine multiple PDFs into one document, reorder files, and prepare a cleaner PDF for upload, printing, or sharing.

Learn when to extract page ranges from a PDF and when to reorder or delete pages before downloading a rebuilt document.

Convert images into PDF documents or render PDF pages as JPG and PNG images depending on your upload, print, or sharing workflow.

Prepare PDFs for sharing by adding page numbers, draft watermarks, and fixing rotated pages before sending or uploading.

A practical guide to choosing merge, split, compress, convert, metadata, watermark, page number, rotate, and text/signature PDF tools.