📚 The Blog

Convert km/h to mph and back — the exact factor, a quick mental shortcut, common speed limits, and a free speed converter.

Stay under the limit — count characters for a tweet (280), Instagram bio (150) or meta description (~155) live, free, in your browser.

Convert numbers to words free online — write amounts in words for cheques and legal forms, in both international and Indian number systems.

Convert numbers to Roman numerals and back free online — plus the simple rules behind I, V, X, L, C, D and M so you can read any of them.

Convert Unix timestamps to human dates and back free online — what epoch time is, why developers use it, and the year-2038 problem.

Check and understand an IP address free online — public vs private, IPv4 vs IPv6, and what your IP does (and doesn't) reveal about you.

Check if a card number is validly formatted with the Luhn algorithm free online — how the checksum works and what it does (and doesn't) prove.

Create clean, SEO-friendly URL slugs free online — why good URLs matter for ranking and clicks, and the rules for writing them.

Convert PDF to JPG images free — no watermark, no signup, and nothing uploaded. Turn every PDF page into a sharp JPG in your browser.

Convert PDF pages to lossless PNG images free — crisp text and lines, no upload, no signup. Done entirely in your browser.

Convert Excel (.xlsx, .xls) to CSV for free in your browser — no software, no signup, and your file is never uploaded. Step-by-step guide.

Copy or extract text from a PDF free online — get clean plain text you can reuse, without uploading your file. Plus what to do with scanned PDFs.