Omni Calculator
FreeOver 3000 purpose-built calculators — mortgage amortization, concrete volume, drug dosage, orbital mechanics — each explaining its formula and assumptions, written and reviewed by subject-matter experts. Free with no account.
Are you the maker of Omni Calculator? Claim this listing →
More in Utilities
A giant toolbox of free file utilities that run in your browser — PDF merge and split, image conversion and background removal, video trimming, OCR, and hundreds of small converters with no signup and no watermarks.
Suite of browser tools for audio, video and PDF: cut, merge and convert files, record from webcam or microphone, all with a clean interface and generous free limits.
Completely free PDF toolbox from a German company: merge, split, compress, convert, sign, OCR and edit PDFs with no file-size caps, watermarks or account requirements.
Popular PDF workspace covering merge, split, compress, convert to and from Office formats, sign and watermark, with batch processing. Free tier handles everyday documents; premium lifts size limits.
High-quality file converter supporting 200+ formats across documents, images, audio, video and ebooks, with fine-grained conversion options and an API. Free tier includes daily conversion minutes.
Send large files as a simple link — upload, add an email or copy the URL, done. Free transfers up to 2 GB with expiring links; paid tiers add size, storage and password options.